Steam desuperheater for boiler and using method of steam desuperheater

Abstract

The invention discloses a steam desuperheater for a boiler and a using method of the steam desuperheater, and relates to the technical field of steam desuperheaters. A water injection pipe with a spray head is inserted into the steam pipeline; a flow guide mechanism is arranged in the steam pipeline and comprises a venturi tube; a diversion cone; and a guide plate. By arranging the flow guide mechanism, the cooling process of high-temperature steam is optimized, the influence of steam track intersection on the cooling effect after cooling is avoided, and it is ensured that steam flows in the steam pipeline according to two relatively independent paths; by means of the design, it is guaranteed that the two sets of desuperheating water can act on high-temperature steam of different parts respectively, the flow guide structure enables the two cooled steam flows to circulate in a separated mode and do not interfere with each other, and therefore the efficiency and the cooling effect of the system are improved; according to the layout, the cooling path of the high-temperature steam is optimized, the negative influence caused by steam motion trail intersection is reduced, and the stability and the high efficiency of the cooling process are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of steam desuperheaters, and in particular to a steam desuperheater for a boiler and a use method thereof. Background Art

[0002] A boiler is an energy device that converts the chemical energy of fuel, electrical energy or thermal energy of high-temperature flue gas into steam or hot water; these outputs can directly meet industrial and domestic heat needs, or be further converted into mechanical energy or even electrical energy; during the operation of a steam boiler, if the temperature of the superheated steam exceeds the standard, the boiler must be shut down and cooled, but the high-temperature steam inside is not easy to cool quickly.

[0003] In the prior art, a steam desuperheater is usually used to control the temperature of boiler steam. When cooling is required, the desuperheater will spray cooling water into the high-temperature steam flow, and the two will mix. The cooling water absorbs the heat of the high-temperature steam and vaporizes, and after fully mixing with the original mixed steam, the temperature of the entire steam is effectively reduced.

[0004] However, the above steam desuperheater still has the following defects during use:

[0005] Since the flow rate of low-pressure and high-temperature steam is relatively low, when the existing steam desuperheater sprays desuperheating water, the desuperheating water has a short residence time in the steam and cannot be fully atomized and evaporated. As a result, a large amount of unatomized liquid desuperheating water remains on the inner wall of the steam pipe, causing corrosion. At the same time, even if the desuperheating water has been atomized, the contact time with the inner wall of the pipe is prolonged due to the slow steam flow rate, thereby aggravating the corrosion. Summary of the invention

[0006] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide a steam desuperheater for a boiler and a method of using the same, so as to solve the problem that when the existing steam desuperheater proposed in the above-mentioned background technology is used, a large amount of unatomized liquid desuperheating water will remain on the inner wall of the steam pipe and cause corrosion.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A steam desuperheater for a boiler comprises a steam pipe; a water injection pipe with a nozzle is plugged into the steam pipe; a flow guide mechanism is arranged in the steam pipe, and the flow guide mechanism comprises:

[0009] A venturi tube, wherein the venturi tube is arranged in the steam pipeline;

[0010] A guide cone, the guide cone is arranged on the nozzle, and a guide ring is arranged on the guide cone, and the guide ring is used to change the spraying direction of the cooling water flowing through the guide cone;

[0011] And a guide plate, which is arranged in the steam pipe; the guide plate is used to separate the middle position of the steam pipe from the two sides, so that the cooled steam can flow from the two sides close to the inner wall of the steam pipe.

[0012] Preferably, the nozzle is provided with two groups of spray holes, wherein the cooling water discharged from one group of spray holes is guided by the guide cone and the guide ring and then sprayed in a fan shape toward the position of the venturi; the cooling water discharged from the other group of spray holes is guided by the guide cone and the guide ring and then sprayed in a fan shape into the steam pipe away from the venturi.

[0013] Preferably, the flow guiding mechanism further comprises an adjusting mechanism; the adjusting mechanism is arranged between the steam pipe and the water injection pipe; the adjusting mechanism is used to adjust the position of the nozzle, so as to adjust the position and angle of the nozzle for spraying cooling water.

[0014] Preferably, the adjustment mechanism includes a mounting block, a rotating sleeve, a movable limiting mechanism and a rotating limiting mechanism; the rotating sleeve is coaxially mounted on the water injection pipe; the mounting block is arranged on the steam pipe, and a rotating shaft is arranged on the rotating sleeve, and the rotating sleeve is rotatably connected to the mounting block via the rotating shaft; the movable limiting mechanism is arranged between the water injection pipe and the rotating sleeve; the movable limiting mechanism is used to limit the axial movement between the water injection pipe and the rotating sleeve; the rotating limiting mechanism is arranged between the mounting block and the rotating sleeve; the rotating limiting mechanism is used to limit the rotation between the mounting block and the rotating sleeve, so as to limit the rotation of the water injection pipe.

[0015] Preferably, the regulating mechanism further comprises an isolation cloth, which is arranged between the rotating sleeve and the steam pipe; the isolation cloth is used to cover the gap between the water injection pipe and the steam pipe, so that the steam pipe remains sealed and isolated from the outside.

[0016] Preferably, the movable limiting mechanism comprises a slider and a connecting shaft; a slide groove with a first tooth groove is provided on the water injection pipe, and the length direction of the slide groove is parallel to the axis of the water injection pipe; the slider is slidably connected in the slide groove, and a second tooth groove matching the first tooth groove is provided on the slider; one end of the connecting shaft passes through the rotating sleeve and is connected to the slider;

[0017] A rotating rod is rotatably connected to the connecting shaft, one end of the rotating rod is in contact with the water injection pipe, and a torsion spring is arranged between the rotating rod and the water injection pipe; when the connecting shaft is pushed to move in the positive direction along its axis, the second tooth groove on the slider can be driven to separate from the first tooth groove, and the rotating rod is then forced to rotate, driving the torsion spring to compress; when the torsion spring loses its restriction, the rotating rod can be driven to rotate and reset, thereby driving the rotating rod to move in the opposite direction, so as to drive the second tooth groove on the slider to engage with the first tooth groove.

[0018] Preferably, the rotation limiting mechanism includes a connecting rod and a limiting block; the connecting rod is slidably connected in the rotating sleeve, and one end of the connecting rod is hinged to the rotating rod, and the other end of the connecting rod is connected to the limiting block; a plurality of limiting holes matching the limiting block are provided on the mounting block; the plurality of limiting holes are arranged in a circle with the axis of the rotating shaft on the rotating sleeve as the center; when the second tooth groove is engaged with the first tooth groove, the limiting block is inserted into one of the limiting holes.

[0019] Preferably, a bend is connected to one side of the steam pipe; the bend is in a U-shaped structure, and a water level gauge is provided at the bottom of the U-shaped structure.

[0020] Preferably, a water collecting cylinder is provided at the bottom of the U-shaped structure of the bent pipe, and the top of the water collecting cylinder is connected to the bent pipe; the water level meter is inserted into the water collecting cylinder.

[0021] A method for using a steam desuperheater for a boiler comprises the following steps:

[0022] Step 1: Flow rate control: When steam is introduced into the steam pipe, it first passes through the venturi tube, resulting in velocity changes;

[0023] Step 2: Cooling by water spraying: Two groups of cooling water are sprayed out through the nozzle, one group of cooling water is sprayed into the venturi tube, combined with the fast-circulating steam to achieve cooling; the other group of cooling water is sprayed into the steam pipe away from the venturi tube to form a fan-shaped spraying surface, combined with the high-temperature steam in the steam pipe to achieve cooling.

[0024] Beneficial effects of the present invention:

[0025] 1. By setting up a guide mechanism, the cooling process of high-temperature steam is optimized and the influence of the crossover of steam trajectories after cooling on the cooling effect is avoided, so as to ensure that the steam flows in two relatively independent paths in the steam pipeline; that is, part of the high-temperature steam is first accelerated through the venturi tube and mixed with the first group of cooling water to complete the initial cooling, and then with the help of the guide plate, this part of the cooled steam is guided to the edge area of ​​the steam pipeline and directly discharged along the two sides of the guide plate at a position staggered from the nozzle to avoid interfering with other steam flows; at the same time, the high-temperature steam that has not contacted the cooling water continues to move along the original path, passes under the guide ring and mixes with the second group of cooling water to achieve further cooling; this design ensures that the two groups of cooling water can act on different parts of the high-temperature steam respectively, and the guide structure allows the two cooled steam flows to flow separately without interfering with each other, thereby improving the efficiency and cooling effect of the system; this layout not only optimizes the cooling path of the high-temperature steam, reduces the negative impact caused by the crossover of the steam movement trajectory, but also ensures the stability and efficiency of the cooling process;

[0026] 2. By setting up the adjustment mechanism, first loosen the movement limit mechanism and the rotation limit mechanism to release the constraints on the axial movement and rotation of the water injection pipe; then, by manually pushing the water injection pipe, both its axial position can be adjusted and its rotation angle can be changed, thereby accurately adjusting the position and spraying direction of the sprinkler head; this mechanism ensures that the sprinkler head can be flexibly adjusted as needed to achieve the best spraying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0029] Figure 2 It is a schematic diagram of a partially cutaway three-dimensional structure of the present invention;

[0030] Figure 3 It is a schematic diagram of the overall main cutaway three-dimensional structure of the present invention;

[0031] Figure 4 It is a three-dimensional enlarged structural schematic diagram of the flow guide mechanism of the present invention;

[0032] Figure 5 It is a schematic diagram of a three-dimensional enlarged structure of the guide cone of the present invention;

[0033] Figure 6 It is a schematic diagram of a partially cutaway enlarged structure of a guide cone of the present invention;

[0034] Figure 7 It is a three-dimensional enlarged structural schematic diagram of a part of the structure of the adjustment mechanism of the present invention;

[0035] Figure 8 It is a three-dimensional enlarged structural schematic diagram of a partial structure of the rotation limiting mechanism of the present invention;

[0036] Fig. 9 It is a schematic flow chart of the method of the present invention.

[0037] In the figure: 1. steam pipe; 2. water injection pipe; 3. nozzle; 4. spray hole; 5. guide mechanism; 51. venturi; 52. guide cone; 53. guide ring; 54. guide plate; 55. adjustment mechanism; 551. mounting block; 552. rotating sleeve; 553. isolation cloth; 554. mobile limiting mechanism; 5541. slide groove; 5542. first tooth groove; 5543. slider; 5544. second tooth groove; 5545. connecting shaft; 555. rotation limiting mechanism; 5551. rotating rod; 5552. connecting rod; 5553. limiting block; 5554. limiting hole; 56. elbow; 57. water collecting cylinder; 58. water level gauge. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] like Figure 1-8 As shown, a steam desuperheater for a boiler, such as Figure 1-3 As shown, it includes a steam pipe 1; a water injection pipe 2 with a nozzle 3 is plugged into the steam pipe 1; a guide mechanism 5 is arranged in the steam pipe 1, and the guide mechanism 5 includes: a venturi 51, which is arranged in the steam pipe 1; a guide cone 52, which is arranged on the nozzle 3, and a guide ring 53 is arranged on the guide cone 52, and the guide ring 53 is used to change the spraying direction of the cooling water flowing through the guide cone 52; and a guide plate 54, which is arranged in the steam pipe 1; the guide plate 54 is used to separate the middle position of the steam pipe 1 from the two sides, so that the cooled steam can flow from the two sides close to the inner wall of the steam pipe 1.

[0040] When high-temperature steam flows into the steam pipe 1, the steam speed increases through the venturi 51, and then recovers to its original speed when it is discharged; at the same time, cooling water is sprayed out through the nozzle 3, and forms two sets of fan-shaped parabolic spray trajectories after being guided by the guide cone 52 and the guide ring 53; one set of cooling water is sprayed directly into the venturi 51, contacts with the fast-flowing high-temperature steam and cools it; the other set of cooling water is sprayed toward the other end of the steam pipe 1 away from the venturi 51, forming a parabolic structure, and is rapidly vaporized after combining with the high-temperature steam at this position;

[0041] When part of the high-temperature steam fails to combine with the cooling water, this part of the high-temperature steam moves upward due to its high temperature, while the steam that has been cooled by combining with the cooling water moves downward due to its low temperature and is directly discharged along the bottom of the steam pipe 1; the uncooled steam moving upward moves along the inner wall of the top of the steam pipe 1, and finally approaches the spray trajectory of the cooling water again, thereby achieving secondary cooling; this process ensures that the cooling water sprayed each time can be vaporized to the greatest extent, reducing the possibility of cooling water remaining at the bottom of the steam pipe 1, thereby avoiding the risk of corrosion to the inner wall of the pipe caused by the accumulation of cooling water;

[0042] Through the above mechanism, the system not only achieves comprehensive and continuous cooling of high-temperature steam, but also optimizes the use efficiency of cooling water, ensuring the safety and stability of the internal environment of the steam pipeline 1;

[0043] In the steam pipe 1, the high-temperature steam forms two relatively independent trajectories when circulating; a part of the high-temperature steam is accelerated through the venturi 51 and mixed with the cooling water to achieve cooling; then, with the help of the separation effect of the guide plate 54, this part of the cooled steam flows along the area between the two sides of the guide plate and the steam pipe 1, and is staggered with the position of the nozzle 3 to ensure that it can be discharged directly without interfering with other steam flows;

[0044] At the same time, the other part of the high-temperature steam that has not been combined with the cooling water continues to move along the original path, and after passing under the guide ring 53, it meets and combines with the second group of cooling water trajectories to complete further cooling; this design ensures that the two groups of cooling water can effectively act on different parts of the high-temperature steam respectively, and due to the existence of the guide structure, the two cooled steam flows can be circulated separately, avoiding the negative impact on the cooling effect of the high-temperature steam caused by the intersection of the movement trajectories;

[0045] This mechanism not only optimizes the cooling path of high-temperature steam and reduces the impact of steam trajectory crossing after cooling, but also improves the efficiency and cooling effect of the entire system, ensuring the stability and efficiency of the cooling process.

[0046] like Figure 1-6 As shown, two groups of spray holes 4 are provided on the spray head 3, and the cooling water discharged from one group of spray holes 4 is guided by the guide cone 52 and the guide ring 53 and then sprayed in a fan shape toward the position of the venturi 51; the cooling water discharged from the other group of spray holes 4 is guided by the guide cone 52 and the guide ring 53 and then sprayed in a fan shape into the steam pipe 1 away from the venturi 51.

[0047] It should be noted that the two groups of spray holes 4 are arranged opposite to each other, so that the cooling water sprayed from one group of spray holes 4 is sprayed into the venturi tube 51 after being guided by the guide cone 52 and the guide ring 53, and the cooling water sprayed from the other group of spray holes 4 is sprayed into the steam pipe 1 after being guided by the guide cone 52 and the guide ring 53; the cooling water sprayed into the venturi tube 51 can be combined with the high-temperature steam with a faster flow rate to increase the cooling rate of the high-temperature steam, and the cooling water sprayed into the deeper part of the steam pipe 1 forms a longer trajectory in the air, which increases the residence time of the cooling water in the air, facilitates the combination with the high-temperature steam, and improves the cooling effect;

[0048] By using the guide cone 52 and the guide ring 53 in coordination, the cooling water forms an upward parabolic structure, which increases the residence time of the cooling water in the air, facilitates the combination with the high-temperature steam, and improves the cooling effect.

[0049] like Figure 1-2 , Figure 4 and Figure 7-8As shown, the flow guide mechanism 5 also includes an adjusting mechanism 55; the adjusting mechanism 55 is arranged between the steam pipe 1 and the water injection pipe 2; the adjusting mechanism 55 is used to adjust the position of the nozzle 3 to adjust the position and angle of the nozzle 3 spraying the cooling water; the adjusting mechanism 55 includes a mounting block 551, a rotating sleeve 552, a movable limiting mechanism 554 and a rotating limiting mechanism 555; the rotating sleeve 552 is coaxially sleeved on the water injection pipe 2; the mounting block 551 is arranged on the steam pipe 1, and a rotating shaft is arranged on the rotating sleeve 552, and the rotating sleeve 552 is rotatably connected to the mounting block 551 through the rotating shaft; the movable limiting mechanism 554 is arranged between the water injection pipe 2 and the rotating sleeve 552; the movable limiting mechanism 554 is used to limit the axial movement between the water injection pipe 2 and the rotating sleeve 552; the rotating limiting mechanism 555 is arranged between the mounting block 551 and the rotating sleeve 552; the rotating limiting mechanism 555 is used to limit the rotation between the mounting block 551 and the rotating sleeve 552 to limit the rotation of the water injection pipe 2.

[0050] It should be noted that when it is necessary to adjust the spraying position and angle of the nozzle 3 to adapt to the spraying intensity of high-temperature steam and cooling water with different flow rates, at this time, the restriction on the axial movement and rotation of the water injection pipe 2 is released by moving the limiting mechanism 554 and the rotating limiting mechanism 555, and then the position and spraying angle of the nozzle 3 are adjusted by pushing the water injection pipe 2 to move axially and rotate.

[0051] like Figure 1-2 and Figure 4 As shown, the regulating mechanism 55 also includes an isolation cloth 553, which is arranged between the rotating sleeve 552 and the steam pipe 1; the isolation cloth 553 is used to cover the gap between the water injection pipe 2 and the steam pipe 1, so that the steam pipe 1 is kept in a sealed and isolated state from the outside; it can be understood that the isolation cloth 553 is a high-temperature resistant structure, such as ceramic fiber cloth; through the setting of the isolation cloth 553, the water injection pipe 2 is allowed to move while ensuring that the inside and outside of 1 are still in an isolated state, without affecting the circulation of high-temperature steam in 1.

[0052] like Figure 1 and Figure 7-8As shown, the movable limiting mechanism 554 includes a slider 5543 and a connecting shaft 5545; a slide groove 5541 with a first tooth groove 5542 is provided on the water injection pipe 2, and the length direction of the slide groove 5541 is parallel to the axis of the water injection pipe 2; the slider 5543 is slidably connected in the slide groove 5541, and a second tooth groove 5544 matching the first tooth groove 5542 is provided on the slider 5543; one end of the connecting shaft 5545 passes through the rotating sleeve 552 and is connected to the slider 5543; a rotating rod 5551 is rotatably connected to the connecting shaft 5545, and the rotating rod 55 One end of 51 is in contact with the water injection pipe 2, and a torsion spring is arranged between the rotating rod 5551 and the water injection pipe 2; when the connecting shaft 5545 is pushed to move in the positive direction along its axis, the second tooth groove 5544 on the slider 5543 can be driven to separate from the first tooth groove 5542. At this time, the rotating rod 5551 is forced to rotate, driving the torsion spring to compress; when the torsion spring loses its restriction, it can drive the rotating rod 5551 to rotate and reset, and then drive the rotating rod 5551 to move in the opposite direction, so as to drive the second tooth groove 5544 on the slider 5543 to engage with the first tooth groove 5542.

[0053] It should be noted that when it is necessary to loosen the restriction on the axial movement of the water injection pipe 2, the connecting shaft 5545 is pushed to move, and the slider 5543 is driven to move by the connecting shaft 5545, so that the second tooth groove 5544 is separated from the first tooth groove 5542, and then the water injection pipe 2 is pushed to move along its axis to adjust the position of the nozzle 3 on the water injection pipe 2 in the steam pipe 1; in this process, as the connecting shaft 5545 moves, the rotating rod 5551 is driven to rotate, so that the torsion spring is compressed. After the axial position adjustment of the water injection pipe 2 is completed, when the connecting shaft 5545 is released, the torsion spring drives the rotating rod 5551 to reset, and then pushes the connecting shaft 5545 to move and reset, and drives the slider 5543 to move by the connecting shaft 5545, so that the second tooth groove 5544 and the first tooth groove 5542 return to the meshing state, that is, at this time, the axial direction of the water injection pipe 2 is restored to the limited state.

[0054] like Figure 1 and Figure 7-8 As shown, the rotation limiting mechanism 555 includes a connecting rod 5552 and a limiting block 5553; the connecting rod 5552 is slidably connected in the rotating sleeve 552, and one end of the connecting rod 5552 is hinged to the rotating rod 5551, and the other end of the connecting rod 5552 is connected to the limiting block 5553; a plurality of limiting holes 5554 matching the limiting block 5553 are provided on the mounting block 551; the plurality of limiting holes 5554 are arranged in a circle with the axis of the rotating shaft on the rotating sleeve 552 as the center; when the second tooth groove 5544 is engaged with the first tooth groove 5542, the limiting block 5553 is inserted into one of the limiting holes 5554.

[0055] It should be noted that pushing the connecting shaft 5545 to move will simultaneously release the restriction on the axial movement of the water injection pipe 2, and the position and angle of the nozzle 3 can be adjusted at the same time. When it is necessary to release the restriction on the rotation of the water injection pipe 2, the connecting shaft 5545 is pushed to move, driving the rotating rod 5551 to rotate, and the connecting rod 5552 is driven to move by the rotating rod 5551, so that the limit block 5553 is separated from the limit hole 5554, that is, the water injection pipe 2 can be driven to rotate at this time to adjust the spraying angle of the nozzle 3; after completing the position and angle adjustment of the nozzle 3, the connecting shaft 5545 is released. The shaft 5545 is a torsion spring that drives the rotating rod 5551 to rotate and reset, and at this time drives the second tooth groove 5544 on the slider 5543 to engage with the first tooth groove 5542, and at the same time drives the limit block 5553 on the connecting rod 5552 to be inserted into the limit hole 5554. At this time, when the water injection pipe 2 rotates, when the rotating sleeve 552 rotates, since the limit block 5553 is inserted in the limit hole 5554, the limit block 5553 cannot be driven to rotate, that is, the water injection pipe 2 on the rotating sleeve 552 cannot be driven to rotate, thereby realizing the rotation limit of the water injection pipe 2.

[0056] like Figure 1-8 As shown, a bend 56 is connected to one side of the steam pipe 1; the bend 56 is a U-shaped structure, and a water level gauge 58 is arranged at the bottom of the U-shaped structure; a water collecting cylinder 57 is arranged at the bottom of the U-shaped structure of the bend 56, and the top of the water collecting cylinder 57 is connected to the bend 56; the water level gauge 58 is inserted into the water collecting cylinder 57.

[0057] It should be noted that, through the setting of the U-shaped structure of the bend pipe 56, when there is excess cooling water in the steam pipe 1, it will accumulate at the bottom of the U-shaped structure under the action of gravity, reducing contact with other positions in the steam pipe 1 and reducing corrosion to other positions. Moreover, through the cooperation of the water collecting tube 57 and the water level gauge 58, when a small amount of water accumulates in the water collecting tube 57, a water column of a certain height will be formed. At this time, the water level gauge 58 can be used to quickly decelerate, thereby improving the detection sensitivity and facilitating rapid processing. An electromagnetic drain valve can be set at the bottom of the water collecting tube 57 to realize automatic drainage. It can be understood that the electromagnetic drain valve is a prior art and will not be described in detail.

[0058] like Figure 1-9 As shown, a method for using a steam desuperheater for a boiler comprises the following steps:

[0059] Step 1: flow rate control: when steam is introduced into the steam pipe 1, the steam first passes through the venturi 51, resulting in a velocity change;

[0060] Step 2: Spray water for cooling: two groups of cooling water are sprayed out through the nozzle 3, one group of cooling water is sprayed into the venturi 51, combined with the fast-circulating steam to achieve cooling; the other group of cooling water is sprayed into the steam pipe 1 away from the venturi 51 to form a fan-shaped spraying surface, combined with the high-temperature steam in the steam pipe 1 to achieve cooling.

[0061] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0062] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A steam desuperheater for a boiler, comprising a steam pipeline (1); characterized in that: The steam pipe (1) is plugged with a water injection pipe (2) with a nozzle (3); a flow guiding mechanism (5) is arranged in the steam pipe (1), and the flow guiding mechanism (5) comprises: A venturi tube (51), wherein the venturi tube (51) is arranged in the steam pipeline (1); A guide cone (52), wherein the guide cone (52) is arranged on the nozzle (3), and a guide ring (53) is arranged on the guide cone (52), and the guide ring (53) is used to change the spraying direction of the cooling water flowing through the guide cone (52); and a guide plate (54), wherein the guide plate (54) is arranged in the steam pipe (1); the guide plate (54) is used to separate the middle position of the steam pipe (1) from two sides, so that the steam after cooling flows from the two sides close to the inner wall of the steam pipe (1).

2. A steam desuperheater for a boiler according to claim 1, characterized in that: The nozzle (3) is provided with two groups of spray holes (4), wherein the cooling water discharged from one group of spray holes (4) is guided by a guide cone (52) and a guide ring (53) and then sprayed in a fan shape toward the position of the venturi tube (51); and the cooling water discharged from the other group of spray holes (4) is guided by a guide cone (52) and a guide ring (53) and then sprayed in a fan shape toward the steam pipe (1) away from the venturi tube (51).

3. A steam desuperheater for a boiler according to claim 1, characterized in that: The flow guiding mechanism (5) further comprises an adjusting mechanism (55); the adjusting mechanism (55) is arranged between the steam pipe (1) and the water injection pipe (2); the adjusting mechanism (55) is used to adjust the position of the nozzle (3) so as to adjust the position and angle at which the nozzle (3) sprays cooling water.

4. A steam desuperheater for a boiler according to claim 3, characterized in that: The regulating mechanism (55) comprises a mounting block (551), a rotating sleeve (552), a movement limiting mechanism (554) and a rotation limiting mechanism (555); the rotating sleeve (552) is coaxially sleeved on the water injection pipe (2); the mounting block (551) is arranged on the steam pipe (1), the rotating sleeve (552) is provided with a rotating shaft, and the rotating sleeve (552) is rotatably connected to the mounting block (551) via the rotating shaft; the movement limiting mechanism (554) is arranged between the water injection pipe (2) and the rotating sleeve (552); the movement limiting mechanism (554) is used to limit the axial movement between the water injection pipe (2) and the rotating sleeve (552); the rotation limiting mechanism (555) is arranged between the mounting block (551) and the rotating sleeve (552); the rotation limiting mechanism (555) is used to limit the rotation between the mounting block (551) and the rotating sleeve (552), so as to limit the rotation of the water injection pipe (2).

5. The steam desuperheater for a boiler according to claim 3, characterized in that: The regulating mechanism (55) further comprises an isolation cloth (553), wherein the isolation cloth (553) is arranged between the rotating sleeve (552) and the steam pipe (1); the isolation cloth (553) is used to cover the gap between the water injection pipe (2) and the steam pipe (1), so that the steam pipe (1) remains in a sealed and isolated state from the outside.

6. A steam desuperheater for a boiler according to claim 4, characterized in that: The movable limiting mechanism (554) comprises a slider (5543) and a connecting shaft (5545); a slide groove (5541) with a first tooth groove (5542) is provided on the water injection pipe (2), and the length direction of the slide groove (5541) is parallel to the axis of the water injection pipe (2); the slider (5543) is slidably connected in the slide groove (5541), and a second tooth groove (5544) matched with the first tooth groove (5542) is provided on the slider (5543); one end of the connecting shaft (5545) passes through the rotating sleeve (552) and is connected to the slider (5543); A rotating rod (5551) is rotatably connected to the connecting shaft (5545), one end of the rotating rod (5551) contacts the water injection pipe (2), and a torsion spring is arranged between the rotating rod (5551) and the water injection pipe (2); when the connecting shaft (5545) is pushed to move in the positive direction along its axis, the second tooth groove (5544) on the slider (5543) can be driven to separate from the first tooth groove (5542), at which time the rotating rod (5551) is forced to rotate, driving the torsion spring to compress; when the torsion spring loses its restriction, the rotating rod (5551) can be driven to rotate and reset, thereby driving the rotating rod (5551) to move in the opposite direction, so as to drive the second tooth groove (5544) on the slider (5543) to engage with the first tooth groove (5542).

7. A steam desuperheater for a boiler according to claim 4, characterized in that: The rotation limiting mechanism (555) comprises a connecting rod (5552) and a limiting block (5553); the connecting rod (5552) is slidably connected to the rotating sleeve (552), and one end of the connecting rod (5552) is hinged to the rotating rod (5551), and the other end of the connecting rod (5552) is connected to the limiting block (5553); a plurality of limiting holes (5554) matching the limiting block (5553) are provided on the mounting block (551); the plurality of limiting holes (5554) are arranged in a circle with the axis of the rotating shaft on the rotating sleeve (552) as the center; when the second tooth groove (5544) is engaged with the first tooth groove (5542), the limiting block (5553) is inserted into one of the limiting holes (5554).

8. The steam desuperheater for a boiler according to claim 1, characterized in that: A curved pipe (56) is connected to one side of the steam pipe (1); the curved pipe (56) is in a U-shaped structure, and a water level gauge (58) is arranged at the bottom of the U-shaped structure.

9. A steam desuperheater for a boiler according to claim 8, characterized in that: A water collecting cylinder (57) is arranged at the bottom of the U-shaped structure of the curved pipe (56), and the top of the water collecting cylinder (57) is communicated with the curved pipe (56); the water level gauge (58) is inserted into the water collecting cylinder (57).

10. The method for using a steam desuperheater for a boiler according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: flow rate control: when steam is introduced into the steam pipe (1), the steam first passes through the venturi (51), resulting in a velocity change; Step 2: Cooling by water spraying: two groups of cooling water are sprayed out through the nozzle (3), one group of cooling water is sprayed into the venturi tube (51), combined with the fast-circulating steam to achieve cooling; the other group of cooling water is sprayed into the steam pipe (1) away from the venturi tube (51), forming a fan-shaped spraying surface, combined with the high-temperature steam in the steam pipe (1) to achieve cooling.

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