Multi-channel regulating control device for gaseous fuel in staged combustion chamber

Abstract

The present invention provides a multi-path regulating control device for gaseous fuel in a staged combustion chamber. It relates to the field of improvement of gas turbine combustion chambers, and solves the problem of gas path control of three-stage swirlers or even more-stage swirlers, and includes: a pressure control valve, a fuel sleeve, and a swirler; the upper cover and the main body are sealed and connected, the valve core is arranged inside the main body, and a valve body through hole is formed between the main body and the valve core; the elastic component is supported between the preload regulating valve and the valve core, and the valve core can seal part of the valve body through hole under the action of the elastic component, so that part of the gaseous fuel flow path in the main body is closed. The present invention can improve the reliability of the swirler's operation by mechanically controlling the gas path switching through the elastic component; it has high integration and is easy to assemble, can reduce the weight of the combustion chamber, and plays an excellent control role in the switching of the swirler fuel gas path.

Description

Technical Field

[0001] The invention relates to the field of improvement of gas turbine combustion chambers, and in particular to a gaseous fuel multi-path regulating control device for a staged combustion chamber. Background Art

[0002] In order to ensure the reliability of the gaseous fuel gas turbine combustion chamber and reduce the combustion chamber processing cost and assembly difficulty, the gas supply structure of the gaseous fuel combustion chamber must be optimized.

[0003] At present, the multi-way regulation control of the gaseous fuel of the staged combustion chamber is mainly supplied by using an independent fuel pipe outside the casing, which makes the fuel supply system very complicated and difficult to process and assemble. There are many structures for switching liquid flow channels, but there are few mechanisms for multi-way control and regulation of gas, and the control schemes on the market cannot meet the engineering needs of the central stage of the staged combustion chamber to open and close the gas supply first and then the second stage, and the simultaneous gas supply of the first and second stages. Designing a multi-way regulation control mechanism for gaseous fuel in the staged combustion chamber has become an urgent problem to be solved. Summary of the invention

[0004] A brief overview of the present invention is provided below in order to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify key or important parts of the present invention, nor is it intended to limit the scope of the present invention. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0005] In view of this, in order to solve the above problems, the present invention proposes a gaseous fuel multi-path regulating control device for a staged combustion chamber to achieve multi-path regulating control of the gaseous fuel in the staged combustion chamber.

[0006] The present invention provides a gaseous fuel multi-path regulating control device for a staged combustion chamber, comprising:

[0007] A pressure control valve 1, a fuel sleeve 2 and a swirler 3; the fuel sleeve 2 comprises multiple layers of non-interconnected pipes, each layer of pipes is respectively sealed and connected to a fuel cavity of the swirler 3;

[0008] The pressure control valve 1 includes a preload regulating valve 1a, an elastic component 1c, an upper cover 1d, a main body 1e and a valve core 1i; the upper cover 1d is sealed and connected to the main body 1e, the preload regulating valve 1a is sealed and connected to the upper cover 1d, the upper cover 1d is provided with a through hole for accommodating the elastic component 1c to pass through, the valve core 1i is arranged inside the main body 1e, and a valve body through hole 1k is formed between the valve core 1i and the main body 1e; the side wall of the main body 1e is provided with an air intake channel 1f connected to the valve body through hole 1k and a plurality of non-interconnected gaseous fuel channels, each gaseous fuel channel is respectively sealed and connected to a layer of a pipeline of the fuel sleeve 2, the elastic component 1c is supported between the preload regulating valve 1a and the valve core 1i, and the valve core 1i can seal part of the valve body through hole 1k under the action of the elastic component 1c, so that part of the gaseous fuel flow path of the gaseous fuel in the main body 1e is closed.

[0009] Preferably, the preload regulating valve 1a is connected to the upper cover 1d by threads; the valve core 1i is provided with a baffle 1m, the baffle 1m seals the valve body through hole 1k and has a diameter larger than the diameter of the through hole of the upper cover 1d, and the upper cover 1d is provided with a bleed hole 1b connected to the outside, and the bleed hole 1b is used to balance the air pressure above the baffle 1m to be the same as the normal pressure; in the process of movement of the valve core 1i, the gas in the upper space of the baffle 1m is connected to the outside or the low-pressure air source through the bleed hole 1b; the preload regulating valve 1a is provided with a preload regulating valve core 1j, one end of the elastic component 1c is fixedly connected to the preload regulating valve core 1j, and the other end is supported on the baffle 1m, and the preload regulating valve 1a is screwed so that the elastic component 1c has a working load before the pressure control valve 1 works.

[0010] In the embodiment of the present invention, in the pressure control valve 1, the upper cover 1b is connected to the preload regulating valve 1a by threads, and the elastic component 1c is connected to the preload regulating valve spool 1j by welding. A nut can be pre-assembled before assembling the preload regulating valve 1a to facilitate positioning of the screw-in distance and loosening. The function of the above structure is: by screwing the preload regulating valve 1a, the preload regulating valve spool 1j is pressed down, so that the elastic component 1c has a working load (preload force) before the pressure control valve 1 works, so that the spring 1c reduces shaking and improves accuracy. The size of the preload force depends on the material of the spring 1c itself.

[0011] Preferably, the valve core 1i and the main body 1e form: a central-level valve ball cavity 7a, a first-level valve ball cavity 8a and a second-level valve ball cavity 9a; the gaseous fuel flow channel in the main body 1e includes: a central-level fuel channel 7c, a first-level fuel channel 8c and a second-level fuel channel 9c; the air inlet channel 1f is connected to the valve body through hole 1k through the internal control pipeline 1g and the internal control gas collection cavity 1h; the central-level valve ball cavity 7a is connected to the central-level fuel channel 7c, the first-level valve ball cavity 8a is connected to the first-level fuel channel 8c, the second-level valve ball cavity 9a is connected to the second-level fuel channel 9c, and the central-level fuel channel 7c, the first-level fuel channel 8c and the second-level fuel channel 9c are not connected to each other;

[0012] The valve core 1i includes a center-stage valve ball 7b, a first-stage valve ball 8b, and a second-stage valve ball 9b;

[0013] The sizes of the center-stage valve ball cavity 7a, the first-stage valve ball cavity 8a and the second-stage valve ball cavity 9a are all larger than the size of the valve body through hole 1k, and the sizes of the center-stage valve ball 7b, the first-stage valve ball 8b and the second-stage valve ball 9b can seal the valve body through hole 1k, so that part of the gaseous fuel flow passage in the main body 1e is closed;

[0014] The fuel sleeve 2 includes a central-level fuel pipe 7d, a first-level fuel pipe 8d and a second-level fuel pipe 9d. The fuel chamber of the swirler 3 includes a central-level fuel chamber 7e, a first-level fuel chamber 8e and a second-level fuel chamber 9e. The central-level valve ball chamber 7a, the first-level valve ball chamber 8a and the second-level valve ball chamber 9a are connected with the coaxial central-level fuel pipe 7d, the first-level fuel pipe 8d and the second-level fuel pipe 9d through the central-level fuel channel 7c, the first-level fuel channel 8c and the second-level fuel channel 9c, respectively, so as to input gaseous fuel into the central-level fuel chamber 7e, the first-level fuel chamber 8e and the second-level fuel chamber 9e.

[0015] Preferably, the elastic component 1c is a spring.

[0016] Preferably, the pressure control valve 1 and the central-level fuel pipe 7d, the first-level fuel pipe 8d and the second-level fuel pipe 9d are connected through a threaded joint 6; the central-level fuel pipe 7d, the first-level fuel pipe 8d, the second-level fuel pipe 9d and the swirler 3 are connected by welding or 3D printing; and when connected, the angle between the swirler axis 5a and the fuel casing axis 5b is 90°.

[0017] Preferably, the diameter of the inner control air collecting chamber 1h is smaller than the diameter of the adjacent portion of the valve core 1i.

[0018] Preferably, the internal control pipeline 1g diverts the gas fuel of the intake channel 1f into the internal control gas collecting chamber 1h, and the valve core 1i is moved by the combined action of the gas pressure in the internal control gas collecting chamber 1h and the elastic component 1c;

[0019] When the gaseous fuel pressure is lower than the second working pressure, the gas pressure acts on the valve core 1i through the internal control gas collecting cavity 1h and the elastic force of the elastic component 1c, so that the valve core 1i does not move or compresses the elastic component 1c upward by a distance less than the first displacement threshold, the central valve ball 7b is located in the central valve ball cavity 7a, the first valve ball 8a and the second valve ball 9a are both located in the valve body through hole 1k, and the supply of the gaseous fuel in the air inlet channel 1f to the first fuel channel 8c and the second fuel channel 9c is cut off, and the gaseous fuel enters the central fuel cavity 7e of the cyclone 3 through the air inlet channel 1f, the central valve ball cavity 7a, the central fuel channel 7c, and the central fuel pipe 7d, and supplies the gaseous fuel to the central fuel cavity 7e of the cyclone 3;

[0020] When the gaseous fuel pressure is greater than or equal to the second working pressure and less than the third working pressure, the gas pressure acts on the valve core 1i through the internal control gas collecting cavity 1h and the elastic force of the elastic component 1c, so that the valve core 1i compresses the elastic component 1c upward by a distance greater than or equal to the first displacement threshold and less than the sum of the first displacement threshold and the second displacement threshold, and the central-stage valve ball 7b enters the valve body through hole 1k, seals the central-stage valve ball cavity 7a, stops supplying gaseous fuel to the central-stage fuel cavity 7e of the cyclone 3, and the first-stage valve ball 8b enters the first-stage valve ball cavity 8a. The gaseous fuel enters the first-stage fuel cavity 8e of the cyclone 3 through the air inlet channel 1f, the first-stage valve ball cavity 8a, the first-stage fuel channel 8c, and the first-stage fuel pipe 8d, and supplies gaseous fuel to the first-stage fuel cavity 8e of the cyclone 3; the second-stage valve ball 9b is still located in the valve body through hole 1k to seal the second-stage valve ball cavity 9a;

[0021] When the gaseous fuel pressure is greater than or equal to the third working pressure, the gas pressure acts on the valve core 1i through the inner control gas collecting chamber 1h and the elastic force of the elastic component 1c, so that the valve core 1i compresses the elastic component 1c upward by a distance greater than or equal to the sum of the first displacement threshold and the second displacement threshold. The center-stage valve ball 7b is located in the valve body through hole 1k, the first-stage valve ball 8b is located in the first-stage valve ball chamber 8a, and the second-stage valve ball 9b is located in the second-stage valve ball chamber 9a. The first-stage fuel channel 8c and the second-stage fuel channel 9c are connected with the air inlet channel 1f. The gaseous fuel passes through the air inlet channel 1f, and a part of it passes through the first-stage valve ball chamber 8a, the first-stage fuel channel 8c, and the first-stage fuel pipe 8d to enter the first-stage fuel chamber 8e of the cyclone 3; the other part passes through the second-stage valve ball chamber 9a, the second-stage fuel channel 9c, and the second-stage fuel pipe 9d to supply fuel to the second-stage fuel chamber 9e of the cyclone 3, and to the first-stage fuel chamber 8e and the second-stage fuel chamber 9e of the cyclone 3 at the same time.

[0022] Preferably, the Mach number of the gaseous fuel flowing in the pressure control valve 1 is calculated according to the following formula: Ma

[0023] Q = ρuA

[0024]

[0025] in, Q is the fuel flow rate, in units of kg / s ; ρ is the fuel density in kg / m 3 ; A is the flow area, in units of m 2 ; u is the fuel flow rate in m / s ; κ is the adiabatic index; R g is the gas constant, in units of J / ( kg · K ); T is the thermodynamic temperature, unit: K ;

[0026] When the gaseous fuel is set to an ideal gas, the Mach numbers of the intake passage 1f, the center-stage fuel passage 7c, the first-stage fuel passage 8c, and the second-stage fuel passage 9c are not greater than 0.3.

[0027] The pressure control valve structure of the gaseous fuel multi-path regulating control device of the staged combustion chamber of the present invention uses the working pressure of the gaseous fuel as a signal, controls the fuel supply of the gaseous fuel gas turbine through the interaction between the spring and the pressure of the gaseous fuel, changes the gas flow route inside the pressure control valve, and plays an excellent control role in switching between multiple gas paths.

[0028] These and other advantages of the present invention will become more apparent through the following detailed description of the best embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention may be better understood by referring to the following description given in conjunction with the accompanying drawings, wherein the same or similar reference numerals are used throughout the drawings to represent the same or similar components. The accompanying drawings, together with the following detailed description, are included in and form a part of this specification and are used to further illustrate the preferred embodiments of the present invention and to explain the principles and advantages of the present invention. In the drawings:

[0030] Figure 1 is a schematic structural diagram showing an example of a multi-path regulating control device for gaseous fuel of a staged combustion chamber of the present invention;

[0031] Figure 2 yes Figure 1 A cross-sectional view showing a gaseous fuel multi-path regulating control device for a staged combustion chamber of the present invention;

[0032] Figure 3 yes Figure 1 A schematic diagram showing the structure of the pressure control valve of the present invention in cooperation with the fuel casing and the cyclone in the case of an organic casing;

[0033] Figure 4 is a diagram showing the working state of the pressure control valve when only the first-stage fuel passage of the present invention is connected to the fuel;

[0034] Figure 5 It is a diagram showing the working state of the pressure control valve when the first-stage fuel channel and the second-stage fuel channel of the present invention are both connected to the fuel.

[0035] In the attached figure: 1: pressure control valve; 1a: preload regulating valve; 1b: air leakage hole; 1c: elastic component; 1d: upper cover; 1e: main body; 1f: air inlet channel; 1g: internal control pipeline; 1h: internal control air collecting cavity; 1i: valve core; 1j: preload regulating valve core; 1k: valve body through hole; 1m: baffle; 2: fuel casing; 3: cyclone; 4: casing; 5a: cyclone axis; 5b: fuel casing axis; 5c: valve core axis; 6: screw Threaded joint; 7a: center-stage valve ball cavity; 7b: center-stage valve ball; 7c: center-stage fuel channel; 7d: center-stage fuel pipe; 7e: center-stage fuel cavity; 8a: first-stage valve ball cavity; 8b: first-stage valve ball; 8c: first-stage fuel channel; 8d: first-stage fuel pipe; 8e: first-stage fuel cavity; 9a: second-stage valve ball cavity; 9b: second-stage valve ball; 9c: second-stage fuel channel; 9d: second-stage fuel pipe; 9e: second-stage fuel cavity.

[0036] Those skilled in the art will appreciate that the elements in the drawings are shown only for simplicity and clarity and are not necessarily drawn to scale. For example, the size of some elements in the drawings may be enlarged relative to other elements to help improve the understanding of the embodiments of the present invention. DETAILED DESCRIPTION

[0037] Exemplary embodiments of the present invention will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of actual implementations are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the present disclosure.

[0038] It is also necessary to explain here that, in order to avoid obscuring the present invention due to unnecessary details, only the device structure closely related to the solution according to the present invention is shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0039] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a gaseous fuel multi-path regulating control device for a staged combustion chamber, so as to realize the gaseous fuel multi-path regulating control for the staged combustion chamber.

[0040] The present invention provides a gaseous fuel multi-path regulating control device for a staged combustion chamber, comprising:

[0041] A pressure control valve 1, a fuel sleeve 2 and a swirler 3; the fuel sleeve 2 comprises multiple layers of non-interconnected pipes, each layer of pipes is respectively sealed and connected to a fuel cavity of the swirler 3;

[0042] The pressure control valve 1 includes a preload regulating valve 1a, an elastic component 1c, an upper cover 1d, a main body 1e and a valve core 1i; the upper cover 1d is sealed and connected to the main body 1e, the preload regulating valve 1a is sealed and connected to the upper cover 1d, the upper cover 1d is provided with a through hole for accommodating the elastic component 1c to pass through, the valve core 1i is arranged inside the main body 1e, and a valve body through hole 1k is formed between the valve core 1i and the main body 1e; the side wall of the main body 1e is provided with an air intake channel 1f connected to the valve body through hole 1k and a plurality of non-interconnected gaseous fuel channels, each gaseous fuel channel is respectively sealed and connected to a layer of a pipeline of the fuel sleeve 2, the elastic component 1c is supported between the preload regulating valve 1a and the valve core 1i, and the valve core 1i can seal part of the valve body through hole 1k under the action of the elastic component 1c, so that part of the gaseous fuel flow path of the gaseous fuel in the main body 1e is closed.

[0043] In the embodiment of the present invention, the preload regulating valve 1a is connected to the upper cover 1d by threads; the valve core 1i is provided with a baffle 1m, the baffle 1m seals the valve body through hole 1k, and the diameter is larger than the diameter of the through hole of the upper cover 1d, the upper cover 1d is provided with a bleed hole 1b connected to the outside, the bleed hole 1b is used to balance the air pressure above the baffle 1m to be the same as the normal pressure; during the movement of the valve core 1i, the gas in the space above the baffle 1m is connected to the outside or the low-pressure air source through the bleed hole 1b; the preload regulating valve 1a is provided with a preload regulating valve core 1j, one end of the elastic component 1c is fixedly connected to the preload regulating valve core 1j, and the other end is supported on the baffle 1m, and the preload regulating valve 1a is screwed so that the elastic component 1c has a working load before the pressure control valve 1 works.

[0044] In the embodiment of the present invention, the internal control pipe 1g diverts the gas of the air inlet channel 1f into the internal control collecting chamber 1h, and the valve core 1i is subjected to the combined action of the pressure of the gas in the internal control collecting chamber 1h and the elastic component 1c so that the valve core 1i can move up and down, and the air leakage hole 1b is used to balance the air pressure on the upper part of the baffle 1m to be the same as the normal pressure; during the movement of the valve core 1i, the gas in the upper space of the baffle 1m is connected to the low-pressure gas source through the air leakage hole 1b.

[0045] In the embodiment of the present invention, the valve core 1i and the main body 1e form: a central-level valve ball cavity 7a, a first-level valve ball cavity 8a and a second-level valve ball cavity 9a; the gaseous fuel flow channel in the main body 1e includes: a central-level fuel channel 7c, a first-level fuel channel 8c and a second-level fuel channel 9c; the air inlet channel 1f is connected to the valve body through hole 1k through the internal control pipeline 1g and the internal control gas collection cavity 1h; the central-level valve ball cavity 7a is connected to the central-level fuel channel 7c, the first-level valve ball cavity 8a is connected to the first-level fuel channel 8c, the second-level valve ball cavity 9a is connected to the second-level fuel channel 9c, and the central-level fuel channel 7c, the first-level fuel channel 8c and the second-level fuel channel 9c are not connected to each other;

[0046] The valve core 1i includes a center-stage valve ball 7b, a first-stage valve ball 8b, and a second-stage valve ball 9b;

[0047] The sizes of the center-stage valve ball cavity 7a, the first-stage valve ball cavity 8a and the second-stage valve ball cavity 9a are all larger than the size of the valve body through hole 1k, and the sizes of the center-stage valve ball 7b, the first-stage valve ball 8b and the second-stage valve ball 9b can seal the valve body through hole 1k, so that part of the gaseous fuel flow passage in the main body 1e is closed;

[0048] The fuel sleeve 2 includes a central-level fuel pipe 7d, a first-level fuel pipe 8d and a second-level fuel pipe 9d. The fuel chamber of the swirler 3 includes a central-level fuel chamber 7e, a first-level fuel chamber 8e and a second-level fuel chamber 9e. The central-level valve ball chamber 7a, the first-level valve ball chamber 8a and the second-level valve ball chamber 9a are connected with the coaxial central-level fuel pipe 7d, the first-level fuel pipe 8d and the second-level fuel pipe 9d through the central-level fuel channel 7c, the first-level fuel channel 8c and the second-level fuel channel 9c, respectively, so as to input gaseous fuel into the central-level fuel chamber 7e, the first-level fuel chamber 8e and the second-level fuel chamber 9e.

[0049] In the embodiment of the present invention, the elastic component 1c is a spring.

[0050] In the embodiment of the present invention, the pressure control valve 1 and the central-level fuel pipe 7d, the first-level fuel pipe 8d and the second-level fuel pipe 9d are connected by a threaded joint 6; the central-level fuel pipe 7d, the first-level fuel pipe 8d, the second-level fuel pipe 9d and the swirler 3 are connected by welding or 3D printing; and when connected, the angle between the swirler axis 5a and the fuel casing axis 5b is 90°.

[0051] In the embodiment of the present invention, the diameter of the inner control air collecting cavity 1h is smaller than the diameter of the adjacent portion of the valve core 1i.

[0052] Figure 3The schematic diagram of the structure of the pressure control valve in cooperation with the fuel casing and the cyclone in the case of an organic casing 4 is shown. Figure 3 , Figure 4 and Figure 5 As shown, in the embodiment of the present invention, the gaseous fuel multi-channel regulating control device of the staged combustion chamber has three working states based on the size of the gaseous fuel pressure: only the central-stage fuel cavity 7e of the swirler supplies fuel, only the first-stage fuel cavity 8e of the swirler supplies fuel, and only the first-stage fuel cavity 8e of the swirler and the second-stage fuel cavity 9e of the swirler supply fuel at the same time; specifically:

[0053] The pressure at which the gaseous fuel pressure just overcomes the gravity of the main body 1e and the resistance between the main body 1e and the valve core 1i is set as the first working pressure. When the gaseous fuel pressure is less than or equal to the first working pressure, the valve core 1i is always in the initial position. At this time, the center-stage valve ball cavity 7a is opened, and the elastic component 1c does not deform or maintains the working load or preload applied by the initial preload regulating valve 1a. When the valve core 1i is always in the initial position, the corresponding pressure control valve 1 supplies gaseous fuel to the center-stage fuel cavity 7e of the cyclone 3.

[0054] In the embodiment of the present invention, the internal control pipeline 1g diverts the gas fuel of the intake channel 1f into the internal control gas collecting chamber 1h, and the valve core 1i is moved by the combined action of the gas pressure in the internal control gas collecting chamber 1h and the elastic component 1c;

[0055] When the gaseous fuel pressure is greater than the first working pressure and less than the second working pressure, only the central-stage fuel cavity 7e of the cyclone supplies fuel, and the gas pressure acts on the valve core 1i through the internal control gas collecting cavity 1h and the elastic force of the elastic component 1c, so that the valve core 1i compresses the elastic component 1c upward by a distance less than the first displacement threshold, and the central-stage valve ball 7b is located in the central-stage valve ball cavity 7a, and the first-stage valve ball 8a and the second-stage valve ball 9a are both located in the valve body through hole 1k, cutting off the supply of the gaseous fuel in the air inlet channel 1f to the first-stage fuel channel 8c and the second-stage fuel channel 9c, and the gaseous fuel enters the central-stage fuel cavity 7e of the cyclone 3 through the air inlet channel 1f, the central-stage valve ball cavity 7a, the central-stage fuel channel 7c, and the central-stage fuel pipe 7d, and supplies the gaseous fuel to the central-stage fuel cavity 7e of the cyclone 3;

[0056] When the gaseous fuel pressure is equal to the second working pressure, the center stage valve ball cavity 7a is sealed with the second stage valve ball cavity 9a. The first stage valve ball 8b is located in the first stage valve ball cavity 8a, and at this time, the distance between the lower edge of the first stage valve ball 8b and the valve body through hole 1k is the axial width of the first stage valve ball 8a along the valve core axis 5c. The second working pressure corresponds to the situation where the pressure control valve 1 only supplies fuel to the first stage fuel cavity 8e of the cyclone 3. The distance that the valve core 1i is displaced in the process of the gas pressure increasing from the first working pressure to the second working pressure is called the first displacement threshold.

[0057] When the gaseous fuel pressure is greater than the second working pressure and less than the third working pressure, the gas pressure acts on the valve core 1i through the internal control gas collecting cavity 1h and the elastic force of the elastic component 1c, so that the valve core 1i compresses the elastic component 1c upward by a distance greater than the first displacement threshold and less than the sum of the first displacement threshold and the second displacement threshold, and the central-stage valve ball 7b enters the valve body through hole 1k, seals the central-stage valve ball cavity 7a, stops supplying gaseous fuel to the central-stage fuel cavity 7e of the cyclone 3, and the first-stage valve ball 8b enters the first-stage valve ball cavity 8a. The gaseous fuel enters the first-stage fuel cavity 8e of the cyclone 3 through the air inlet channel 1f, the first-stage valve ball cavity 8a, the first-stage fuel channel 8c, and the first-stage fuel pipe 8d, and supplies gaseous fuel to the first-stage fuel cavity 8e of the cyclone 3; the second-stage valve ball 9b is still located in the valve body through hole 1k to seal the second-stage valve ball cavity 9a;

[0058] When the gaseous fuel pressure is equal to the third working pressure, the center valve ball cavity 7a is sealed, the first valve ball 8b is located in the first valve ball cavity 8a; the second valve ball 9b is located in the second valve ball cavity 9a, and at this time, the distance between the lower edge of the second valve ball 9b and the valve body through hole 1k is the axial width of the second valve ball 9b along the valve core axis 5c. The third working pressure corresponds to the situation where the pressure control valve 1 supplies fuel to the first fuel cavity 8e and the second fuel cavity 9e of the cyclone 3 at the same time. The distance that the valve core 1i is displaced during the process of the gas pressure increasing from the second working pressure to the third working pressure is called the second displacement threshold.

[0059] When the gaseous fuel pressure is greater than the third working pressure, the gas pressure acts on the valve core 1i through the inner control gas collecting cavity 1h and the elastic force of the elastic component 1c, so that the valve core 1i compresses the elastic component 1c upward by a distance greater than the sum of the first displacement threshold and the second displacement threshold. The center-stage valve ball 7b is located in the valve body through hole 1k, the first-stage valve ball 8b is located in the first-stage valve ball cavity 8a, and the second-stage valve ball 9b is located in the second-stage valve ball cavity 9a. The first-stage fuel channel 8c and the second-stage fuel channel 9c are connected with the air inlet channel 1f. The gaseous fuel passes through the air inlet channel 1f, and a part of it passes through the first-stage valve ball cavity 8a, the first-stage fuel channel 8c, and the first-stage fuel pipe 8d to enter the first-stage fuel cavity 8e of the cyclone 3; the other part passes through the second-stage valve ball cavity 9a, the second-stage fuel channel 9c, and the second-stage fuel pipe 9d to supply fuel to the second-stage fuel cavity 9e of the cyclone 3, and to the first-stage fuel cavity 8e and the second-stage fuel cavity 9e of the cyclone 3 at the same time.

[0060] In an embodiment of the present invention, a first displacement threshold and a second displacement threshold are defined in segments. The first displacement threshold and the second displacement threshold are two independent quantities and have no size relationship. The first displacement threshold may be greater than the second displacement threshold, or the first displacement threshold may be less than the second displacement threshold, or the first displacement threshold may be equal to the second displacement threshold. In one possible implementation method, the first displacement threshold may be 4 mm and the second displacement threshold may be 3 mm.

[0061] In the embodiment of the present invention, the Mach number of the gaseous fuel flowing in the pressure control valve 1 is calculated according to the following formula: Ma

[0062] Q = ρuA

[0063]

[0064] in, Q is the fuel flow rate, in units of kg / s ; ρ is the fuel density in kg / m 3 ; A is the flow area, in units of m 2 ; u is the fuel flow rate in m / s ; κ is the adiabatic index; R g is the gas constant, in units of J / ( kg · K );T is the thermodynamic temperature, unit: K ;

[0065] When the gaseous fuel is set to an ideal gas, the obtained Mach number is no greater than 0.3.

[0066] Mach number Ma Not more than 0.3 corresponds to the description of the flow rate in the gaseous fuel pipeline, that is, the flow rate of the fuel cannot exceed pm / s (where pm / s is the Mach number Ma= 0.3 corresponds to a velocity of about 100 m / s). Ma When it is not greater than 0.3, the gas flows in a subsonic incompressible manner. At this time, the density of the fuel does not change with the pressure, which meets the requirements for fuel transportation in the pipeline.

[0067] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0069] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0070] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0071] Although the present invention has been described according to a limited number of embodiments, it will be apparent to those skilled in the art, with the benefit of the above description, that other embodiments may be envisioned within the scope of the invention thus described. In addition, it should be noted that the language used in this specification is selected primarily for readability and teaching purposes, rather than for explaining or defining the subject matter of the present invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is illustrative, not restrictive, with respect to the scope of the present invention, which is defined by the appended claims.

Claims

1. A gas fuel multi-channel regulating control device for a staged combustion chamber, characterized in that: include: A pressure control valve (1), a fuel sleeve (2) and a swirler (3); the fuel sleeve (2) comprises a plurality of non-interconnected pipes, each layer of the pipes being respectively sealed and connected to a fuel cavity of the swirler (3); The pressure control valve (1) comprises a preload regulating valve (1a), an elastic component (1c), an upper cover (1d), a main body (1e) and a valve core (1i); the upper cover (1d) and the main body (1e) are sealed and connected, the preload regulating valve (1a) is sealed and connected to the upper cover (1d), the upper cover (1d) is provided with a through hole for accommodating the elastic component (1c) to pass through, the valve core (1i) is arranged inside the main body (1e), and a valve body through hole (1k) is formed between the valve core (1i) and the main body (1e); The side wall of the main body (1e) is provided with an air intake passage (1f) communicating with the valve body through hole (1k) and a plurality of gaseous fuel passages that are not communicated with each other, each gaseous fuel passage is respectively sealed and connected to a layer of a pipe of the fuel sleeve (2), the elastic component (1c) is supported between the preload regulating valve (1a) and the valve core (1i), and the valve core (1i) can seal part of the valve body through hole (1k) under the action of the elastic component (1c), so that part of the gaseous fuel flow passage in the main body (1e) is closed; The valve core (1i) and the main body (1e) form: a central-level valve ball cavity (7a), a first-level valve ball cavity (8a) and a second-level valve ball cavity (9a); the gaseous fuel flow channel in the main body (1e) includes: a central-level fuel channel (7c), a first-level fuel channel (8c) and a second-level fuel channel (9c); the air inlet channel (1f) is connected to the valve body through hole (1k) through an internal control pipeline (1g) and an internal control gas collecting cavity (1h); the central-level valve ball cavity (7a) is connected to the central-level fuel channel (7c), the first-level valve ball cavity (8a) is connected to the first-level fuel channel (8c), the second-level valve ball cavity (9a) is connected to the second-level fuel channel (9c), and the central-level fuel channel (7c), the first-level fuel channel (8c) and the second-level fuel channel (9c) are not connected to each other; The valve core (1i) comprises a center-stage valve ball (7b), a first-stage valve ball (8b) and a second-stage valve ball (9b); The sizes of the center-stage valve ball cavity (7a), the first-stage valve ball cavity (8a) and the second-stage valve ball cavity (9a) are all larger than the size of the valve body through hole (1k); the sizes of the center-stage valve ball (7b), the first-stage valve ball (8b) and the second-stage valve ball (9b) are capable of sealing the valve body through hole (1k), so that part of the gaseous fuel flow passage in the main body (1e) is closed; The fuel sleeve (2) comprises a central-level fuel pipe (7d), a first-level fuel pipe (8d) and a second-level fuel pipe (9d); the fuel chamber of the swirler (3) comprises: a central-level fuel chamber (7e), a first-level fuel chamber (8e) and a second-level fuel chamber (9e); the central-level valve ball chamber (7a), the first-level valve ball chamber (8a) and the second-level valve ball chamber (9a) are respectively connected to the coaxial central-level fuel pipe (7d), the first-level fuel pipe (8d) and the second-level fuel pipe (9d) through the central-level fuel channel (7c), the first-level fuel channel (8c) and the second-level fuel channel (9c), thereby inputting gaseous fuel into the central-level fuel chamber (7e), the first-level fuel chamber (8e) and the second-level fuel chamber (9e).

2. The regulating control device according to claim 1, characterized in that: The preload regulating valve (1a) is connected to the upper cover (1d) by threads; the valve core (1i) is provided with a baffle (1m), the baffle (1m) seals the valve body through hole (1k), and the diameter is larger than the diameter of the through hole of the upper cover (1d); the upper cover (1d) is provided with an air leakage hole (1b) connected to the outside, and the air leakage hole (1b) is used to balance the air pressure on the upper part of the baffle (1m) to be the same as the normal pressure; during the movement of the valve core (1i), the The gas in the upper space of the baffle (1m) is connected to the outside or a low-pressure gas source through the air leakage hole (1b); a preload regulating valve core (1j) is arranged inside the preload regulating valve (1a); one end of the elastic component (1c) is fixedly connected to the preload regulating valve core (1j), and the other end is supported on the baffle (1m); by screwing the preload regulating valve (1a), the elastic component (1c) has a working load before the pressure control valve (1) works.

3. The regulating control device according to claim 1 or 2, characterized in that: The elastic component (1c) is a spring.

4. The regulating control device according to claim 1, characterized in that: The pressure control valve (1) is connected to a central-level fuel pipe (7d), a first-level fuel pipe (8d) and a second-level fuel pipe (9d) via a threaded joint (6); the central-level fuel pipe (7d), the first-level fuel pipe (8d), the second-level fuel pipe (9d) and the swirler (3) are connected by welding or 3D printing; and when connected, the angle formed by the swirler axis (5a) and the fuel sleeve axis (5b) is 90°.

5. The regulating control device according to claim 1, characterized in that: The diameter of the inner control air collecting chamber (1h) is smaller than the diameter of the valve core (1i) at the adjacent portion.

6. The regulating control device according to claim 1, characterized in that: The internal control pipeline (1g) diverts the gas fuel of the intake channel (1f) into the internal control gas collecting chamber (1h), and the valve core (1i) is moved by the combined action of the pressure of the gas in the internal control gas collecting chamber (1h) and the elastic component (1c); When the gaseous fuel pressure is lower than the second working pressure, the gas pressure acts on the valve core (1i) through the internal control gas collecting cavity (1h) and the elastic force of the elastic component (1c), so that the valve core (1i) does not move or compresses the elastic component (1c) upward by a distance less than the first displacement threshold, the central valve ball (7b) is located in the central valve ball cavity (7a), the first valve ball (8a) and the second valve ball (9a) are both located in the valve body through hole (1k), and the supply of the gaseous fuel in the air inlet channel (1f) to the first fuel channel (8c) and the second fuel channel (9c) is cut off, and the gaseous fuel enters the central fuel cavity (7e) of the cyclone (3) through the air inlet channel (1f), the central valve ball cavity (7a), the central fuel channel (7c) and the central fuel pipe (7d), and the gaseous fuel is supplied to the central fuel cavity (7e) of the cyclone (3); When the gaseous fuel pressure is greater than or equal to the second working pressure and less than the third working pressure, the gas pressure acts on the valve core (1i) through the internal control gas collecting cavity (1h) and the elastic force of the elastic component (1c), so that the valve core (1i) compresses the elastic component (1c) upward by a distance greater than or equal to the first displacement threshold and less than the sum of the first displacement threshold and the second displacement threshold, and the center-stage valve ball (7b) enters the valve body through hole (1k), sealing the center-stage valve ball cavity (7a), and stopping the flow of gas to the center of the cyclone (3). The core-stage fuel cavity (7e) supplies gaseous fuel, the first-stage valve ball (8b) enters the first-stage valve ball cavity (8a), and the gaseous fuel enters the first-stage fuel cavity (8e) of the cyclone (3) through the air inlet passage (1f), the first-stage valve ball cavity (8a), the first-stage fuel passage (8c), and the first-stage fuel pipe (8d), and the gaseous fuel is supplied to the first-stage fuel cavity (8e) of the cyclone (3); the second-stage valve ball (9b) is still located in the valve body through hole (1k) to seal the second-stage valve ball cavity (9a); When the gaseous fuel pressure is greater than or equal to the third working pressure, the gas pressure acts on the valve core (1i) through the internal control gas collecting cavity (1h) and the elastic force of the elastic component (1c), so that the valve core (1i) compresses the elastic component (1c) upward by a distance greater than or equal to the sum of the first displacement threshold and the second displacement threshold. The center-stage valve ball (7b) is located in the valve body through hole (1k), the first-stage valve ball (8b) is located in the first-stage valve ball cavity (8a), the second-stage valve ball (9b) is located in the second-stage valve ball cavity (9a), and the first-stage fuel channel (8c) and the second-stage fuel channel (8c) are connected to each other. The channel (9c) is connected to the air inlet channel (1f); a portion of the gaseous fuel passes through the air inlet channel (1f) and enters the first-stage fuel chamber (8e) of the cyclone (3) through the first-stage valve ball chamber (8a), the first-stage fuel channel (8c) and the first-stage fuel pipe (8d); the other portion passes through the second-stage valve ball chamber (9a), the second-stage fuel channel (9c) and the second-stage fuel pipe (9d) to supply fuel to the second-stage fuel chamber (9e) of the cyclone (3) and to the first-stage fuel chamber (8e) and the second-stage fuel chamber (9e) of the cyclone (3) at the same time.

7. The regulating control device according to claim 1, characterized in that: The Mach number Ma of the gaseous fuel flowing in the pressure control valve (1) is calculated according to the following formula: Q=ρuA Where Q is the fuel flow rate in kg / s; ρ is the fuel density in kg / m 3 ; A is the flow area, unit is m 2 ; u is the fuel flow rate, in m / s; κ is the adiabatic index; R g is the gas constant, unit is J / (kg·K); T is the thermodynamic temperature, unit is K; When the gaseous fuel is set to an ideal gas, the Mach number Ma of the air intake passage (1f), the center-stage fuel passage (7c), the first-stage fuel passage (8c) and the second-stage fuel passage (9c) is not greater than 0.3.

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