Steam spraying mechanism and device for reducing nitrogen oxide generation of gas turbine

Abstract

The utility model relates to the technical field of power generation of gas turbines, in particular to a steam spraying mechanism and a device for reducing nitrogen oxide generation of a gas turbine, which comprises a mounting component, a fixed part, a movable part arranged outside the fixed part, a spraying part arranged inside the fixed part and a clamping part arranged on the outer wall of the fixed part; the fixing part comprises a spraying pipe on the outer wall, a first protruding plate is arranged on the inner wall of the spraying pipe, and a second protruding plate is arranged below the first protruding plate. The nozzle is arranged, the temperature of the downstream flame face of the fuel gas hole is reduced, the nozzle is further matched with the spraying pipe, rapid disassembly and assembly of the nozzle are completed, and the blocked nozzle is convenient to replace; in addition, by arranging the cooling assembly and utilizing the mode of combining multiple transformation schemes, generation of nitric oxide is controlled, the combustion chamber of the gas turbine does not need to be integrally designed, and the research and development cost and the time cost are remarkably reduced while the needed effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas turbine power generation, in particular to a steam injection mechanism and a device for reducing nitrogen oxide generation of a gas turbine. Background Art

[0002] Heavy-duty gas turbines for power generation are often responsible for peak-load regulation due to their advantages such as fast start and stop and rapid load increase and decrease, in order to meet the electricity required during daily peak electricity consumption. They are an indispensable part of the power generation system.

[0003] Compared with coal-fired units, its lower pollutant emissions have significant advantages, but as the power of gas turbines increases from generation to generation, the initial temperature at the turbine inlet is also increasing. The higher temperature in the combustion chamber is often accompanied by the generation of thermal nitrogen oxides, which is not conducive to the normal power generation of the gas turbine. The high temperature area of ​​the combustion chamber is cooled by setting a pressure nozzle, but the nozzle may be blocked or damaged after long-term use and needs to be replaced on time. Based on the above problems, we proposed a steam injection mechanism and a device for reducing the generation of nitrogen oxides in gas turbines. Utility Model Content

[0004] In view of the above-mentioned technical problem that the existing nozzle may be clogged or damaged after long-term use and needs to be replaced on time, a steam injection mechanism is proposed.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a steam spray mechanism, which includes an installation assembly, including a fixing part, a movable part arranged outside the fixing part, a spraying part arranged inside the fixing part and a clamping part arranged on the outer wall of the fixing part; the fixing part includes a nozzle on the outer wall, the inner wall of the nozzle is provided with a first convex plate, and a second convex plate is provided below the first convex plate.

[0006] As a preferred solution of the steam injection mechanism of the utility model, wherein: the outer wall of the nozzle is provided with a convex ring, and the outer wall of the convex ring is provided with an elastic member.

[0007] As a preferred solution of the steam injection mechanism of the utility model, wherein: the movable part comprises a sliding ring arranged outside the nozzle, the outer wall of the sliding ring is provided with a protrusion, and the protrusion is movably matched with the elastic part.

[0008] As a preferred solution of the steam spray mechanism of the utility model, wherein: the outer wall of the sliding ring is provided with anti-slip grooves, the spraying member includes a spray head arranged inside the spray pipe, and the outer wall of the spray head is provided with a groove.

[0009] As a preferred solution of the steam injection mechanism of the utility model, wherein: the outer wall of the nozzle is provided with an inclined surface, the inclined surface is movably matched with the first convex plate, and the end surface of the nozzle is provided with a spray hole.

[0010] As a preferred solution of the steam injection mechanism of the utility model, the clamping member includes a receiving cavity opened on the outer wall of the nozzle, a ball is arranged inside the receiving cavity, and the ball is movably matched with the groove.

[0011] The beneficial effects of the steam injection mechanism of the utility model are as follows: by setting the injection hole to spray liquid water and atomize it into fine droplets, the contact area between the liquid water and the surrounding high-temperature combustion gas can be enhanced, which is beneficial to evaporation and heat absorption, thereby reducing the temperature of the flame surface downstream of the combustion gas hole to reduce the generation of nitrogen oxides, and by pushing the sliding ring, the nozzle can be quickly disassembled and assembled, so that the blocked nozzle can be easily replaced.

[0012] In view of the fact that the higher temperature in the combustion chamber is often accompanied by the generation of thermal nitrogen oxides, which is not conducive to the normal power generation operation of the gas turbine, a device for reducing the generation of nitrogen oxides in a gas turbine is proposed.

[0013] To solve the above technical problems, the utility model also provides the following technical solutions: a device for reducing the generation of nitrogen oxides in a gas turbine, which includes a steam injection mechanism; and a cooling component, including an air outlet member, a supply member arranged outside the air outlet member, and an injection member arranged inside the air outlet member.

[0014] As a preferred solution of the device for reducing nitrogen oxide generation of a gas turbine of the utility model, the gas outlet component includes an end cover, a gas hole is opened inside the end cover, an injection channel is opened inside the end cover, and a flame tube is provided on the downstream outer wall of the end cover.

[0015] As a preferred solution of the gas turbine nitrogen oxide generation reduction device of the utility model, the supply member includes a purge rod arranged inside the end cover, a sleeve rod is coaxially arranged inside the purge rod, a liquid water supply pipe and a steam supply pipe are respectively arranged on the outer wall of the sleeve rod, and valves are arranged on the outer walls of the liquid water supply pipe and the steam supply pipe.

[0016] As a preferred solution of the device for reducing the generation of nitrogen oxides in a gas turbine of the utility model, the injection component includes a fuel pipe arranged inside the gas hole, the outer wall of the fuel pipe is provided with swirler blades, the outer wall of the swirler blades is provided with fuel holes, and the outer wall of the swirler blades is provided with fuel injection holes.

[0017] The beneficial effects of the gas turbine nitrogen oxide generation reduction device of the present utility model are as follows: by injecting steam or liquid water into the high-temperature zone of the combustion chamber, the two can be switched according to actual conditions. Compared with liquid water, steam has less adverse effects on coherent structures such as vortices and vortex cores downstream of the nozzle, and these coherent structures significantly affect the combustion stability. Therefore, the lower impact on the coherent structures can weaken combustion instability. At the same time, gas is easier to diffuse than liquid, which is conducive to mixing with the surrounding high-temperature fuel gas and reducing the flame temperature. Compared with steam, liquid water can evaporate and absorb heat, and there is a phase change process, which can make the cooling effect of the high-temperature zone better, thereby reducing the generation of thermal nitrogen oxides. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the connection structure between the end cover and the nozzle in the utility model.

[0020] Figure 2 It is a schematic diagram of the sliding ring connection structure in the utility model.

[0021] Figure 3 It is a schematic diagram of the nozzle in the utility model.

[0022] Figure 4 It is a cross-sectional view of the connection structure of the installation component in the utility model.

[0023] Figure 5 This is a connection diagram of the cooling component in the present utility model.

[0024] Figure 6 This is a diagram of the internal structure of the end cover in the present utility model.

[0025] Figure 7 The figure shows the fuel injection hole in the utility model. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0029] Example 1, reference Figure 1 to Figure 4 , which is the first embodiment of the utility model, provides a steam spray mechanism, including a mounting assembly 100, by providing a fixing member 101, a movable member 102 arranged outside the fixing member 101, a spraying member 103 arranged inside the fixing member 101 and a clamping member 104 arranged on the outer wall of the fixing member 101, so as to achieve the function of quickly replacing the nozzle 103a.

[0030] Specifically, the mounting assembly 100 includes a fixing member 101, a movable member 102 arranged outside the fixing member 101, a spraying member 103 arranged inside the fixing member 101, and a clamping member 104 arranged on the outer wall of the fixing member 101; the fixing member 101 includes a nozzle 101a on the outer wall, a first convex plate 101a-1 is arranged on the inner wall of the nozzle 101a, and a second convex plate 101a-2 is arranged below the first convex plate 101a-1.

[0031] Preferably, a convex ring 101b is provided on the outer wall of the nozzle 101a, and an elastic member 101b-1 is provided on the outer wall of the convex ring 101b.

[0032] Preferably, the movable member 102 comprises a sliding ring 102a disposed outside the nozzle 101a, and a protrusion 102a-1 is disposed on the outer wall of the sliding ring 102a, and the protrusion 102a-1 is movably matched with the elastic member 101b-1.

[0033] Preferably, the outer wall of the sliding ring 102a is provided with anti-slip grooves 102b, and the spraying member 103 includes a spray head 103a arranged inside the spray pipe 101a, and the outer wall of the spray head 103a is provided with a groove 103a-1.

[0034] Preferably, an outer wall of the nozzle 103a is provided with an inclined surface 103b, the inclined surface 103b is movably matched with the first convex plate 101a-1, and an injection hole 103c is opened on the end surface of the nozzle 103a.

[0035] Preferably, the clamping member 104 comprises a receiving cavity 104a opened on the outer wall of the nozzle 101a, and a ball 104a-1 is arranged inside the receiving cavity 104a, and the ball 104a-1 is movably matched with the groove 103a-1.

[0036] Among them, the anti-slip pattern 102b is provided to increase the friction force and facilitate the staff to push the sliding ring 102a; the elastic member 203b-1 is a compression spring, which cooperates with the sliding ring 102a to reset it after being pushed; the nozzle 101a is preferably set to five, the central axis of the injection hole 103c is at an angle of 30 to 90 degrees with the central axis of the end cover 201a, and the opening of the injection hole 103c is toward the downstream of the end cover 201a, that is, the medium sprayed from the injection hole 103c is consistent with the movement direction of the gas.

[0037] In summary, liquid water is sprayed through the injection hole 103c and atomized into fine droplets, which can enhance its contact area with the surrounding high-temperature combustion gas, facilitate evaporation and heat absorption, and further reduce the temperature of the flame surface downstream of the combustion gas hole 201a-1, so as to reduce the production of nitrogen oxides. When it is necessary to install the nozzle 103a, the nozzle 103a is inserted into the nozzle pipe 101a by pushing the sliding ring 102a downward, and the inclined surface 103b and the first convex plate 101a-1 are movably matched to make the bottom of the nozzle 103a stuck in the second convex plate 101a-2, and the ball 104a-1 further falls into the groove 103a-1, and the sliding ring 102a is loosened to realize the installation of the nozzle 103a. When it is necessary to replace the nozzle 103a, the sliding ring 102a is pushed downward again to retract the ball 104a-1 into the accommodating cavity 104a, and the nozzle 103a can be removed.

[0038] Example 2, reference Figure 5-6 , which is the second embodiment of the utility model, provides a device for reducing the generation of nitrogen oxides in a gas turbine, including a cooling component 200, which achieves the effect of reducing the generation of nitrogen oxides in a combustion chamber by arranging an air outlet member 201, a supply member 202 arranged outside the air outlet member 201, and an injection member 203 arranged inside the air outlet member 201.

[0039] Specifically, the cooling component 200 includes an air outlet member 201 , a supply member 202 disposed outside the air outlet member 201 , and an injection member 203 disposed inside the air outlet member 201 .

[0040] Preferably, the gas outlet member 201 includes an end cover 201a, a gas hole 201a-1 is provided inside the end cover 201a, an injection channel 201a-2 is provided inside the end cover 201a, and a flame tube 201b is provided on the downstream outer wall of the end cover 201a.

[0041] The nozzle 101a is arranged on the outer wall of the end cover 201a; the nozzle 101a is connected with the injection channel 201a-2; the upstream of the injection channel 201a-2 is connected with the external pipeline through a flange, and the downstream is connected with the nozzle 101a by welding, and the injection hole 103c is a circular hole; the purge rod 202a and the sleeve rod 202a-1 are both long straight circular tubes, the sleeve rod 202a-1 is coaxially arranged inside the purge rod 202a, and the upstream of the purge rod 202a is connected with the gas source through a flange. The downstream is an opening connected to the flame tube 201b of the combustion chamber; valves 202c are provided on the outer walls of the liquid water supply pipe 202b and the steam supply pipe 202b-1, which can be manually opened and closed by the control system, supporting the selection of cooling medium under different working conditions, with higher flexibility and better energy-saving effect; a pressure atomizing nozzle is provided at the outlet of the sleeve rod 202a-1 to facilitate the atomization of liquid water. At the same time, the injected steam or liquid water can play an anti-flashback role together with the air in the purge rod 202a.

[0042] In summary, the high- and medium-pressure steam drums or high- and medium-pressure feed water pumps in the waste heat boiler system are used as the supply source, and the supply source is connected to the sleeve rod 202a-1 through the liquid water supply pipe 202b and the steam supply pipe 202b-1, and liquid water or steam is supplied to the high-temperature area downstream of the gas hole 201a-1 to reduce the flame surface temperature, thereby reducing nitrogen oxide emissions.

[0043] Example 3, reference Figure 1 to Figure 7 , which is the third embodiment of the utility model, is based on the previous embodiment, except that a fuel injection hole 203b-1 is provided downstream of the back side of the swirler blade 201a-1 to increase the average flow velocity of the mixed gas and reduce the residence time of the gas.

[0044] Specifically, the supply member 202 includes a purge rod 202a arranged inside the end cover 201a, a sleeve rod 202a-1 is coaxially arranged inside the purge rod 202a, a liquid water supply pipe 202b and a steam supply pipe 202b-1 are respectively arranged on the outer wall of the sleeve rod 202a-1, and valves 202c are arranged on the outer walls of the liquid water supply pipe 202b and the steam supply pipe 202b-1.

[0045] Preferably, the injection member 203 includes a fuel pipe 203a arranged inside the gas hole 201a-1, the outer wall of the fuel pipe 203a is provided with a swirler blade 203a-1, the outer wall of the swirler blade 203a-1 is provided with a fuel hole 203b, and the outer wall of the swirler blade 203a-1 is provided with a fuel injection hole 203b-1.

[0046] The fuel pipe 203a is used to supply fuel to the swirler blade 203a-1. The swirler blade 203a-1 is a hollow blade with a chamber inside. The central axis of the fuel injection hole 203b-1 is parallel to the central axis of the gas hole 201a-1, that is, in the same direction as the airflow movement direction. The fuel injected from the fuel injection hole 203b-1 has a low swirl degree and a higher speed along the axial direction of the gas injection hole 201a-1. The fuel hole 203b is provided on the blade basin and the back side of the blade, but is generally provided at the upstream part of the blade (such as Figure 7 The fuel injection hole 203b-1 is arranged at the downstream part of the blade and is opened only on the back side of the blade (as shown in FIG. 7 ).

[0047] In summary, by providing the fuel injection hole 203b-1, the average flow rate of the mixed gas is increased, the residence time of the fuel gas is reduced, and thus the production of nitrogen oxides is reduced.

[0048] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and ratio of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0049] Additionally, in order to provide a concise description of example embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0050] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A steam injection mechanism, characterized in that: include, The mounting assembly (100) comprises a fixing member (101), a movable member (102) arranged outside the fixing member (101), a spraying member (103) arranged inside the fixing member (101), and a clamping member (104) arranged on the outer wall of the fixing member (101); The fixing member (101) comprises a nozzle (101a) on the outer wall, a first convex plate (101a-1) is provided on the inner wall of the nozzle (101a), and a second convex plate (101a-2) is provided below the first convex plate (101a-1).

2. The steam injection mechanism according to claim 1, characterized in that: The outer wall of the nozzle (101a) is provided with a convex ring (101b), and the outer wall of the convex ring (101b) is provided with an elastic member (101b-1).

3. The steam injection mechanism according to claim 2, characterized in that: The movable part (102) comprises a sliding ring (102a) arranged outside the nozzle (101a), and a convex block (102a-1) is provided on the outer wall of the sliding ring (102a), and the convex block (102a-1) is movably matched with the elastic part (101b-1).

4. The steam injection mechanism according to claim 3, characterized in that: The outer wall of the sliding ring (102a) is provided with anti-slip grooves (102b), and the spraying member (103) comprises a spray head (103a) arranged inside the spray pipe (101a), and the outer wall of the spray head (103a) is provided with a groove (103a-1).

5. The steam injection mechanism according to claim 4, characterized in that: The outer wall of the nozzle (103a) is provided with an inclined surface (103b), the inclined surface (103b) is movably matched with the first convex plate (101a-1), and the end surface of the nozzle (103a) is provided with a spray hole (103c).

6. The steam injection mechanism according to claim 5, characterized in that: The clamping member (104) comprises a receiving cavity (104a) opened on the outer wall of the nozzle (101a), a ball (104a-1) is arranged inside the receiving cavity (104a), and the ball (104a-1) is movably matched with the groove (103a-1).

7. A device for reducing nitrogen oxide generation in a gas turbine, characterized in that: comprising the steam injection mechanism according to any one of claims 1 to 6; and The cooling component (200) comprises an air outlet component (201), a supply component (202) arranged outside the air outlet component (201), and an injection component (203) arranged inside the air outlet component (201).

8. The gas turbine nitrogen oxide generation reduction device according to claim 7, characterized in that: The gas outlet member (201) comprises an end cover (201a), a gas hole (201a-1) is provided inside the end cover (201a), an injection channel (201a-2) is provided inside the end cover (201a), and a flame tube (201b) is provided on the downstream outer wall of the end cover (201a).

9. The gas turbine nitrogen oxide generation reduction device according to claim 8, characterized in that: The supply member (202) comprises a purge rod (202a) arranged inside the end cover (201a), a sleeve rod (202a-1) being coaxially arranged inside the purge rod (202a), a liquid water supply pipe (202b) and a steam supply pipe (202b-1) being respectively arranged on the outer wall of the sleeve rod (202a-1), and valves (202c) are both arranged on the outer walls of the liquid water supply pipe (202b) and the steam supply pipe (202b-1).

10. The gas turbine nitrogen oxide generation reduction device according to claim 9, characterized in that: The injection member (203) comprises a fuel pipe (203a) arranged inside the gas hole (201a-1), the outer wall of the fuel pipe (203a) is provided with a swirler blade (203a-1), the outer wall of the swirler blade (203a-1) is provided with a fuel hole (203b), and the outer wall of the swirler blade (203a-1) is provided with a fuel injection hole (203b-1).

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