A gas fuel combustion chamber with a vibration prevention structure

Abstract

The present invention discloses a gas fuel combustion chamber with a vibration prevention structure, including a furnace, wherein the furnace is sequentially provided with a flame mixing combustion section and a combustion flame pressure pulsation section along the direction from the inlet to the outlet; at least two levels of water-cooled walls are provided in the combustion flame pressure pulsation section; when more than two burners are provided on the furnace, a first-level water-cooled wall is provided, and when one burner is provided on the furnace, no first-level water-cooled wall is provided; when more than two burners are provided on the furnace, the first-level water-cooled wall in the combustion flame pressure pulsation section is arranged as follows: first-level water-cooled walls are provided on both sides of the tail of each first-level water-cooled wall; in the combustion flame pressure pulsation section, the rear-level water-cooled walls are provided on both sides of the tail of each previous-level water-cooled wall; all water-cooled walls are connected to the furnace. The present invention can effectively solve the vibration of the combustion chamber by arranging water-cooled walls at appropriate positions in the furnace, and the consumption of consumables is reduced for combustion equipment of the same capacity.

Description

Technical Field

[0001] The invention belongs to the technical field of gas fuel combustion equipment, and in particular relates to a gas fuel combustion chamber with a vibration prevention and control structure. Background Art

[0002] Gas fuels provide more than 50% of the world's primary energy due to the huge chemical energy they contain. The energy generated by the combustion of these fuels is not only used in industry, but also in transportation, agriculture and people's livelihood applications. Although alternative energy sources such as wind energy or solar energy account for an increasing proportion of the total energy structure, their efficiency is relatively low and the absolute value of their proportion is relatively small. Energy in the next decade or so will still mainly come from combustion. At present, for the ultra-low nitrogen combustion mode based on gas fuel, pressure pulsation is very easy to occur in the combustion chamber, which acts on the walls around the combustion chamber and other equipment, causing equipment vibration. When the pressure pulsation frequency is consistent with the inherent frequency of industrial combustion equipment, equipment resonance will occur, seriously endangering the safe and stable operation of the equipment and the life of the equipment. At present, on the one hand, there is no means of preventing and controlling vibration of gas fuel combustion in the prior art. If the problem of different vibrations caused by pressure pulsation generated by gas fuel combustion in different furnace types can be solved, the problems of operator safety and equipment damage caused by vibration can be greatly reduced, and safety and efficiency can be maximized. On the other hand, in order to ensure boiler efficiency and load, gas fuel combustion equipment is equipped with radiation heating surfaces and a large number of convection heating surfaces, which requires large consumables and has low investment costs, resulting in poor economic benefits for equipment manufacturers. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a gas fuel combustion chamber with a vibration prevention structure. On the one hand, the present invention can effectively solve the vibration of the combustion chamber. On the other hand, for combustion equipment of the same capacity, the use of consumables is greatly reduced.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A gas fuel combustion chamber with a vibration prevention structure comprises a furnace, a burner is provided at the inlet of the furnace, and the furnace is sequentially provided with a flame mixing combustion section and a combustion flame pressure pulsation section along the direction from the inlet to the outlet;

[0006] When one burner is arranged on the furnace, at least two levels of water-cooled walls are arranged in the combustion flame pressure pulsation section along the direction from the furnace inlet to the outlet; when more than two burners are arranged on the furnace, a first level of water-cooled wall is arranged between two adjacent burners in the flame mixing combustion section of the furnace, and at least two levels of water-cooled walls are arranged in the combustion flame pressure pulsation section along the direction from the furnace inlet to the outlet; wherein the plane where the first level of water-cooled wall is located and the plane where the water-cooled walls of each level in the combustion flame pressure pulsation section are located are parallel to the direction from the furnace inlet to the outlet;

[0007] When more than two burners are arranged on the furnace, the first-stage water-cooled wall in the combustion flame pressure pulsation section is arranged as follows: the first-stage water-cooled wall is arranged on both sides of the tail of each first-stage water-cooled wall;

[0008] When one burner or more than two burners are arranged on the furnace, in the combustion flame pressure pulsation section, both sides of the tail of each previous water-cooled wall are provided with the next water-cooled wall, and the front end of the next water-cooled wall is arranged at a position not exceeding the tail of the previous water-cooled wall;

[0009] The upper ends of the primary water-cooled wall and the water-cooled walls of each level in the combustion flame pressure pulsation section are connected to the upper part of the furnace, and the lower ends are connected to the lower part of the furnace.

[0010] Preferably, when more than two burners are arranged on the furnace, the primary water-cooled wall is arranged in the middle of two adjacent burners in the flame mixing combustion section of the furnace, and the tail of the primary water-cooled wall extends to the end of the flame mixing combustion section.

[0011] Preferably, when a burner is arranged on the furnace, the first-stage water-cooled wall in the combustion flame pressure pulsation section is arranged on the axis of the burner.

[0012] Preferably, all water-cooled walls in the same level of water-cooled walls within the combustion flame pressure pulsation section are respectively distributed at equally divided positions in the width direction of the furnace, and the number of equally divided positions is the total number of water-cooled walls in the same level of water-cooled walls plus one.

[0013] Preferably, the length of the flame mixing combustion section from the furnace inlet to the furnace outlet is times the furnace depth.

[0014] Preferably, two levels of water-cooled walls are arranged in the combustion flame pressure pulsation section along the direction from the furnace inlet to the outlet, and the two levels of water-cooled walls are sequentially recorded as the secondary water-cooled wall and the tertiary water-cooled wall;

[0015] Among them, the secondary water-cooled wall is arranged from 1 / 3 to 1 / 2 of the furnace depth in the direction from the furnace inlet to the furnace outlet in the combustion flame pressure pulsation section, and the tertiary water-cooled wall is arranged from 1 / 2 to 3 / 3 of the furnace depth.

[0016] Preferably, the thickness of the primary water-cooled wall and the water-cooled walls of each level in the combustion flame pressure pulsation section is the same as the thickness of the water-cooled walls around the combustion chamber, and the thickness direction of the water-cooled wall is the width direction of the furnace.

[0017] Preferably, when a burner is arranged on the furnace, one secondary water-cooled wall is arranged, and two tertiary water-cooled walls are arranged, the water inlet of the tertiary water-cooled wall is arranged at the tail of the tertiary water-cooled wall, the water outlet of the tertiary water-cooled wall is arranged at the front end of the tertiary water-cooled wall, the water inlet of the secondary water-cooled wall is arranged at the tail of the secondary water-cooled wall, the water outlet of the secondary water-cooled wall is arranged at the front end of the secondary water-cooled wall, and the water outlets of the two tertiary water-cooled walls are connected with the water inlet of the secondary water-cooled wall.

[0018] Preferably, when two burners are arranged on the furnace, one primary water-cooled wall is arranged, two secondary water-cooled walls are arranged, and four tertiary water-cooled walls are arranged;

[0019] The two secondary water-cooled walls are respectively recorded as the No. 1 secondary water-cooled wall and the No. 2 secondary water-cooled wall, and the four tertiary water-cooled walls are respectively recorded as the No. 1 tertiary water-cooled wall, the No. 2 tertiary water-cooled wall, the No. 3 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall, wherein the No. 1 tertiary water-cooled wall and the No. 2 tertiary water-cooled wall are respectively arranged on both sides of the tail of the No. 1 secondary water-cooled wall, and the No. 3 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall are respectively arranged on both sides of the tail of the No. 2 secondary water-cooled wall;

[0020] The water inlet of the primary water-cooled wall is arranged at the tail of the primary water-cooled wall, the water outlet of the primary water-cooled wall is arranged at the front end of the primary water-cooled wall, the water inlets of the No. 1 secondary water-cooled wall and the No. 2 secondary water-cooled wall are both arranged at their respective tails, the water outlets of the No. 1 secondary water-cooled wall and the No. 2 secondary water-cooled wall are arranged at their respective front ends, the water inlets of the No. 1 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall are arranged at their respective tails, the water outlets of the No. 1 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall are arranged at their respective front ends, the water inlets of the No. 2 tertiary water-cooled wall and the No. 3 tertiary water-cooled wall are arranged at their respective front ends, and the water outlets of the No. 2 tertiary water-cooled wall and the No. 3 tertiary water-cooled wall are arranged at their respective tails;

[0021] The water outlet of the No. 1 third-stage water-cooled wall, the water inlet of the No. 3 third-stage water-cooled wall, the water inlet of the No. 2 second-stage water-cooled wall and the water inlet of the first-stage water-cooled wall are connected in sequence; the water outlet of the No. 4 third-stage water-cooled wall, the water inlet of the No. 2 third-stage water-cooled wall, the water inlet of the No. 1 second-stage water-cooled wall and the water inlet of the first-stage water-cooled wall are connected in sequence.

[0022] Preferably, when three burners are arranged on the furnace, two of the first-level water-cooled walls are arranged, three of the second-level water-cooled walls are arranged, and four of the third-level water-cooled walls are arranged;

[0023] The two primary water-cooled walls are respectively recorded as the No. 1 primary water-cooled wall and the No. 2 primary water-cooled wall, the three secondary water-cooled walls are respectively recorded as the No. 1 secondary water-cooled wall, the No. 2 secondary water-cooled wall and the No. 3 secondary water-cooled wall, and the four tertiary water-cooled walls are respectively recorded as the No. 1 tertiary water-cooled wall, the No. 2 tertiary water-cooled wall, the No. 3 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall, wherein the No. 1 secondary water-cooled wall and the No. 2 secondary water-cooled wall are respectively arranged on both sides of the tail of the No. 1 primary water-cooled wall, the No. 2 secondary water-cooled wall and the No. 3 secondary water-cooled wall are respectively arranged on both sides of the tail of the No. 2 primary water-cooled wall, the No. 1 tertiary water-cooled wall and the No. 2 tertiary water-cooled wall are respectively arranged on both sides of the tail of the No. 1 secondary water-cooled wall, the No. 2 tertiary water-cooled wall and the No. 3 tertiary water-cooled wall are respectively arranged on both sides of the tail of the No. 2 secondary water-cooled wall, and the No. 3 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall are respectively arranged on both sides of the tail of the No. 3 secondary water-cooled wall;

[0024] The water inlets of the No. 1 primary water-cooled wall and the No. 2 primary water-cooled wall are arranged at their respective tails, the water outlets of the No. 1 primary water-cooled wall and the No. 2 primary water-cooled wall are arranged at their respective front ends, the water inlets of the No. 1 secondary water-cooled wall, the No. 2 secondary water-cooled wall and the No. 3 secondary water-cooled wall are all arranged at their respective tails, the water outlets of the No. 1 secondary water-cooled wall, the No. 2 secondary water-cooled wall and the No. 3 secondary water-cooled wall are arranged at their respective front ends, the water inlets of the No. 1 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall are arranged at their respective tails, the water outlets of the No. 1 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall are arranged at their respective front ends, the water inlets of the No. 2 tertiary water-cooled wall and the No. 3 tertiary water-cooled wall are arranged at their respective front ends, and the water outlets of the No. 2 tertiary water-cooled wall and the No. 3 tertiary water-cooled wall are arranged at their respective tails;

[0025] The water outlet of the No. 1 third-stage water-cooled wall is connected with the water inlet of the No. 3 third-stage water-cooled wall; the water outlet of the No. 3 third-stage water-cooled wall is divided into two paths, one of which is connected with the water inlet of the No. 2 second-stage water-cooled wall, and the other is connected with the water inlet of the No. 3 second-stage water-cooled wall; the water outlet of the No. 4 third-stage water-cooled wall is connected with the water inlet of the No. 2 third-stage water-cooled wall; the water outlet of the No. 2 third-stage water-cooled wall is divided into two paths, one of which is connected with the water inlet of the No. 2 second-stage water-cooled wall, and the other is connected with the water inlet of the No. 1 second-stage water-cooled wall; the water outlet of the No. 1 second-stage water-cooled wall is connected with the water inlet of the No. 1 first-stage water-cooled wall, and the water outlet of the No. 3 second-stage water-cooled wall is connected with the water inlet of the No. 2 first-stage water-cooled wall; the water outlet of the No. 2 second-stage water-cooled wall is divided into two paths, one of which is connected with the water inlet of the No. 1 first-stage water-cooled wall, and the other is connected with the water inlet of the No. 2 first-stage water-cooled wall.

[0026] The present invention has the following beneficial effects:

[0027] The present invention arranges water-cooled walls in the furnace, the upper end of the water-cooled walls is connected to the upper part of the furnace, and the lower end is connected to the lower part of the furnace. Through these water-cooled walls, on the one hand, the structural strength of the combustion chamber is improved, and the impact vibration of the pulsation generated by the combustion of gas fuel on the surrounding of the combustion chamber is weakened. On the other hand, the radiation heating surface in the furnace is increased. Under the condition of combustion equipment of equal capacity, the convection heating surface consumables can be greatly reduced, the cost is reduced, and the economic benefits of the equipment manufacturer are improved. The present invention only requires a minor modification of the existing furnace structure, which can simultaneously solve the combustion chamber vibration and greatly reduce the use of consumables, thereby making the gas fuel combustion chamber safer, and the investment cost is low, the economic benefits are good, and the current problems of combustion chamber vibration, large amount of manufacturing equipment consumables, and poor economic benefits are completely solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1(a) is a schematic diagram of the structure when two burners are arranged in the combustion chamber in an embodiment of the present invention; FIG1(b) is a cross-sectional view of the embodiment shown in FIG1(a); FIG1(c) is a distribution diagram of vibration measurement points in the embodiment shown in FIG1(a); FIG1(d) is a vibration data diagram of different positions of a 116MW combustion chamber of a power plant before modification; FIG1(e) is a vibration data diagram of different positions of the 116MW combustion chamber of the power plant after modification according to the technical solution of the present invention;

[0029] FIG2(a) is a schematic diagram of the structure of a combustion chamber in which three burners are arranged in an embodiment of the present invention; FIG2(b) is a cross-sectional view of the embodiment shown in FIG2(a);

[0030] FIG3( a ) is a schematic structural diagram of a combustion chamber in an embodiment of the present invention in which one burner is arranged; FIG3( b ) is a cross-sectional view of the embodiment shown in FIG3( a ).

[0031] Among them: 1 is the burner; 2 is the combustion chamber; 3 is the primary water-cooled wall; 4 is the secondary water-cooled wall; 5 is the tertiary water-cooled wall; 6 is the combustion chamber outlet. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] 1(a) to 3(b), the gas fuel combustion chamber with a vibration prevention structure of the present invention comprises a furnace, a burner 1 is provided at the entrance of the furnace, the furnace and the burner together constitute a combustion chamber 2, the gas fuel and air are mixed and burned in the furnace through the burner 1, a high-temperature flame and high-temperature flue gas are generated, and heat is exchanged in the furnace; the furnace is sequentially provided with a flame mixing combustion section (see section A in FIG1(b)) and a combustion flame pressure pulsation section (see section B and section C in FIG1(b), wherein section B and section C together constitute the combustion flame pressure pulsation section) along the direction from the entrance to the exit (refer to the direction from top to bottom in FIG1(b));

[0034] Referring to Fig. 3 (a) and Fig. 3 (b), when one burner 1 is arranged on the furnace, at least two levels of water-cooled walls are arranged in the combustion flame pressure pulsation section along the direction from the furnace inlet to the outlet. At this time, no primary water-cooled wall 3 is arranged in the flame mixing combustion section of the furnace; referring to Fig. 1 (a) to Fig. 2 (b), when two or more burners 1 are arranged on the furnace, a primary water-cooled wall 3 is arranged between two adjacent burners 1 in the flame mixing combustion section of the furnace, and at least two levels of water-cooled walls are arranged in the combustion flame pressure pulsation section along the direction from the furnace inlet to the outlet; wherein, the plane where the primary water-cooled wall 3 is located and the plane where the water-cooled walls of each level in the combustion flame pressure pulsation section are located are parallel to the direction from the furnace inlet to the outlet;

[0035] Referring to FIG. 1 (a) to FIG. 2 (b), when more than two burners 1 are arranged on the furnace, the first-stage water-cooled wall in the combustion flame pressure pulsation section is arranged as follows: the first-stage water-cooled wall is arranged on both sides of the tail end (the lower end as shown in FIG. 2 (b)) of each first-stage water-cooled wall 3;

[0036] Referring to Figures 1 (a) to 3 (b), when one burner 1 is arranged on the furnace and when two or more burners 1 are arranged on the furnace, in the combustion flame pressure pulsation section, the water-cooled wall arrangement principle of the one burner 1 and the two burners is the same, that is, the rear water-cooled walls are arranged on both sides of the tail of each previous water-cooled wall, see Figures 1 (a) to 2 (b), the front end of the rear water-cooled wall (the upper end of the secondary water-cooled wall 4 as shown in Figure 2 (b)) is arranged at a position not exceeding the tail of the previous water-cooled wall. In general, the front end of the rear water-cooled wall can be arranged in a position flush with the tail of the previous water-cooled wall, see Figure 1 (b), the upper end of the tertiary water-cooled wall (5) is flush with the lower end of the secondary water-cooled wall 4 in the left-right direction;

[0037] The upper ends of the primary water-cooled wall 3 and the water-cooled walls of each level in the combustion flame pressure pulsation section are connected to the upper part of the furnace, and the lower ends are connected to the lower part of the furnace, generally in a fixed connection form.

[0038] The high-temperature flame and flue gas of the burner 1 pass through the primary water-cooled wall 3, the various water-cooled walls in the combustion flame pressure pulsation section in sequence, and finally are discharged through the combustion chamber outlet (6).

[0039] As an optional implementation scheme of the present invention, referring to Figures 1 (a) and 2 (b), when more than two burners 1 are arranged on the furnace, the first-level water-cooled wall 3 is arranged at a position between two adjacent burners 1 in the flame mixing combustion section of the furnace, and the tail of the first-level water-cooled wall 3 extends to the end of the flame mixing combustion section, and the upper end of the first-level water-cooled wall 3 is connected to the upper part of the furnace, and the lower end is connected to the lower part of the furnace. In this way, the use of the first-level water-cooled wall 3 can not only stabilize the overall structure of the combustion chamber 2 and reduce vibration, but also avoid the influence on the combustion of the burner as much as possible, thereby ensuring the stability of the combustion flame in the initial stage of mixed combustion and ensuring the stability of the flame mixing combustion section.

[0040] As an optional embodiment of the present invention, referring to FIG. 3 (a) and FIG. 3 (b), when a burner 1 is arranged on the furnace, the first-stage water-cooled wall in the combustion flame pressure pulsation section is arranged on the axis of the burner 1. At this time, only one secondary water-cooled wall is actually arranged.

[0041] Referring to Figures 1(b), 2(b) and 3(b), all water-cooled walls of the same level in the combustion flame pressure pulsation section are respectively distributed at equal positions in the width direction of the furnace, and the number of equal parts is the total number of water-cooled walls in the same level plus one. That is to say, referring to Figure 1(b), the two secondary water-cooled walls 4 are located at three equal positions in the furnace section B, and the four tertiary water-cooled walls 5 are respectively located at five equal positions in the furnace section C.

[0042] As a preferred embodiment of the present invention, referring to Figures 1(b), 2(b) and 3(b), the flame mixing combustion section is the main flame area of ​​the burner, and the length of the flame mixing combustion section from the furnace inlet to the furnace outlet is 1 / 4 to 1 / 3 times the furnace depth, that is, the length A of section A satisfies the following relationship: 1 / 3 times the furnace depth D≥A≥1 / 4 times the furnace depth D. The setting of this distance can ensure the stability of the burner combustion flame in the initial stage of mixed combustion and ensure the stability of the flame mixing combustion section.

[0043] As a preferred embodiment of the present invention, although more water-cooled walls are arranged in the combustion flame pressure pulsation section, which can effectively enhance the strength of the combustion chamber and reduce vibration, too many water-cooled walls are likely to cause increased resistance in the combustion chamber, which is not conducive to combustion in the combustion chamber. Therefore, in the combustion flame pressure pulsation section of the present invention, two levels of water-cooled walls are arranged along the direction from the furnace inlet to the outlet, see Figures 1 (b), 2 (b) and 3 (b), and the two levels of water-cooled walls are respectively recorded as the secondary water-cooled wall 4 and the tertiary water-cooled wall 5; wherein, in the combustion flame pressure pulsation section, along the direction from the furnace inlet to the outlet, the secondary water-cooled wall 4 is arranged from 1 / 3 of the furnace depth to 1 / 2 of the furnace depth (i.e., section B of the furnace), and the tertiary water-cooled wall 5 is arranged from 1 / 2 of the furnace depth to 3 / 3 of the furnace depth (i.e., section C of the furnace). Specifically, referring to Figures 1(b), 2(b) and 3(b), from top to bottom, the B section of the furnace starts at 1 / 3 of the furnace depth and ends at 1 / 2 of the furnace depth; the C section of the furnace starts at 1 / 2 of the furnace depth and ends at 2 / 3 of the furnace depth. Among them, the B section of the furnace is the combustion flame pressure pulsation area, which is also the area where the vibration gradually amplifies. The setting of the secondary water-cooled wall 4 can effectively increase the strength and reduce the vibration; the C section of the furnace is the area with the largest combustion flame pressure pulsation and the area with larger vibration. Therefore, the number of the tertiary water-cooled walls 5 is also the largest, which can increase the strength and effectively reduce the vibration.

[0044] As a preferred embodiment of the present invention, the thickness of the primary water-cooled wall 3 and the water-cooled walls of each level in the combustion flame pressure pulsation section is consistent with the thickness of the water-cooled walls existing around the existing combustion chamber before the transformation by the scheme of the present invention. The thickness direction of the water-cooled wall is the width direction of the furnace. At this thickness, it can ensure that the water-cooled wall strengthens the overall structure of the combustion chamber and reduces vibration, and can also effectively reduce the resistance of each water-cooled wall to the combustion chamber.

[0045] The water-cooled walls of the combustion chamber of the present invention are arranged in appropriate positions to ensure that the strength of the combustion chamber is enhanced and vibration is reduced. In addition, there should not be too many water-cooled walls, which will increase the resistance of the combustion chamber and increase the power consumption. Therefore, the present invention proposes the following arrangements of water-cooled walls: only two levels of water-cooled walls are arranged in the combustion flame pressure pulsation section. Moreover, when a burner 1 is arranged on the furnace, no first-level water-cooled wall 3 is arranged in the flame mixing combustion section, and only one first-level water-cooled wall is arranged in the combustion flame pressure pulsation section and is located on the axis of the burner. Referring to Figures 1 (b) and 2 (b), when three burners are arranged, the number of three-level water-cooled walls 5 is the same as the number of three-level water-cooled walls 5 when two burners are arranged. This is to ensure that the strength of the combustion chamber is enhanced and vibration is reduced, and to minimize the resistance of the combustion chamber caused by the additional water-cooled walls.

[0046] In order to ensure that the water-cooled wall added in the combustion chamber absorbs heat uniformly, a cross-flow mode is adopted to ensure that the water temperature on both sides absorbs heat at the same rate. The present invention provides examples of cooling water circulation paths when one burner 1, two burners 1, and three burners 1 are arranged on the furnace as follows:

[0047] Referring to Fig. 3 (b), in the case where one burner 1 is arranged on the furnace, one secondary water-cooled wall 4 is arranged, two tertiary water-cooled walls 5 are arranged, the water inlet of the tertiary water-cooled wall 5 is arranged at the tail of the tertiary water-cooled wall 5, the water outlet of the tertiary water-cooled wall 5 is arranged at the front end of the tertiary water-cooled wall 5, the water inlet of the secondary water-cooled wall 4 is arranged at the tail of the secondary water-cooled wall 4, the water outlet of the secondary water-cooled wall 4 is arranged at the front end of the secondary water-cooled wall 4, and the water outlets of the two tertiary water-cooled walls 5 are connected with the water inlet of the secondary water-cooled wall 4. To ensure that the water-cooled wall added in the combustion chamber absorbs heat uniformly, a cross-flow mode is adopted to ensure that the water temperature on both sides absorbs heat equally.

[0048] Referring to FIG. 1 (b), in the case where two burners 1 are arranged on the furnace, one primary water-cooled wall 3 is arranged, two secondary water-cooled walls 4 are arranged, and four tertiary water-cooled walls 5 are arranged; the two secondary water-cooled walls 4 are respectively recorded as the No. 1 secondary water-cooled wall and the No. 2 secondary water-cooled wall, and the four tertiary water-cooled walls 5 are respectively recorded as the No. 1 tertiary water-cooled wall, the No. 2 tertiary water-cooled wall, the No. 3 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall, wherein the No. 1 tertiary water-cooled wall and the No. 2 tertiary water-cooled wall are respectively arranged on both sides of the tail of the No. 1 secondary water-cooled wall, and the No. 3 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall are respectively arranged on both sides of the tail of the No. 2 secondary water-cooled wall; the water inlet of the primary water-cooled wall 3 is arranged at the tail of the primary water-cooled wall 3, the water outlet of the primary water-cooled wall 3 is arranged at the front end of the primary water-cooled wall 3, the No. 1 secondary water-cooled wall and the No. 2 secondary water-cooled wall are respectively arranged at the rear end of the No. 1 secondary water-cooled wall. The water inlets of the water-cooled walls are all arranged at their respective tails, the water outlets of the No. 1 secondary water-cooled wall and the No. 2 secondary water-cooled wall are arranged at their respective front ends, the water inlets of the No. 1 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall are arranged at their respective tails, the water outlets of the No. 1 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall are arranged at their respective front ends, the water inlets of the No. 2 tertiary water-cooled wall and the No. 3 tertiary water-cooled wall are arranged at their respective front ends, and the water outlets of the No. 2 tertiary water-cooled wall and the No. 3 tertiary water-cooled wall are arranged at their respective tails; the water outlet of the No. 1 tertiary water-cooled wall, the water inlet of the No. 3 tertiary water-cooled wall, the water inlet of the No. 2 secondary water-cooled wall and the water inlet of the No. 1 water-cooled wall 3 are connected in sequence; the water outlet of the No. 4 tertiary water-cooled wall, the water inlet of the No. 2 tertiary water-cooled wall, the water inlet of the No. 1 secondary water-cooled wall and the water inlet of the No. 1 water-cooled wall 3 are connected in sequence. To ensure uniform heat absorption of the water-cooled wall added in the combustion chamber, a cross-flow pattern is adopted to ensure the same heat absorption of the water temperature on both sides.

[0049] Taking a 116MW combustion chamber and a furnace of a power plant as an example, two burners 1 are arranged on the furnace. According to the present invention, the combustion chamber is modified. The vibration data of different positions of the combustion chamber before and after the modification are shown in Figures 1 (d) and 1 (e). The specific distribution of vibration measuring points is shown in Figure 1 (c). The vibration measuring points are arranged on the upper wall of the combustion chamber. A total of three rows of nine measuring points are arranged. The first row of measuring points is located at a distance of 4m from the burner (the three measuring points are respectively recorded as 4m-1, 4m-2 and 4m-3). The second row of measuring points is located at a distance of 7.5m from the burner. The third row of measuring points is located at a distance of 9m from the burner (the three measuring points are recorded as 7.5m-1, 7.5m-2 and 7.5m-3 respectively). It can be seen from Figure 1 (d) and Figure 1 (e) that the technical solution of the present invention has a great effect on reducing the vibration of the combustion chamber. From the comparison of the vibration intensity values ​​before and after the transformation, it can be seen that the technical solution of the present invention reduces the vibration by about 70%, which greatly alleviates the damage caused by vibration to the equipment. .

[0050] Referring to FIG. 2 (b), in the case where three burners 1 are arranged on the furnace, two primary water-cooled walls 3 are arranged, three secondary water-cooled walls 4 are arranged, and four tertiary water-cooled walls 5 are arranged; the two primary water-cooled walls 3 are respectively recorded as the No. 1 primary water-cooled wall and the No. 2 primary water-cooled wall, the three secondary water-cooled walls 4 are respectively recorded as the No. 1 secondary water-cooled wall, the No. 2 secondary water-cooled wall and the No. 3 secondary water-cooled wall, and the four tertiary water-cooled walls 5 are respectively recorded as the No. 1 tertiary water-cooled wall, the No. 2 tertiary water-cooled wall, the No. 3 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall, among which the No. 1 secondary water-cooled wall and the No. 2 secondary water-cooled wall are respectively arranged on both sides of the tail of the No. 1 primary water-cooled wall, and the No. 2 secondary water-cooled wall is .... The water-cooled wall and the No. 3 secondary water-cooled wall are respectively arranged on both sides of the tail of the No. 2 primary water-cooled wall, the No. 1 third-level water-cooled wall and the No. 2 third-level water-cooled wall are respectively arranged on both sides of the tail of the No. 1 secondary water-cooled wall, the No. 2 third-level water-cooled wall and the No. 3 third-level water-cooled wall are respectively arranged on both sides of the tail of the No. 2 secondary water-cooled wall, the No. 3 third-level water-cooled wall and the No. 4 third-level water-cooled wall are respectively arranged on both sides of the tail of the No. 3 secondary water-cooled wall; the water inlets of the No. 1 primary water-cooled wall and the No. 2 primary water-cooled wall are arranged at their respective tails, the water outlets of the No. 1 primary water-cooled wall and the No. 2 primary water-cooled wall are arranged at their respective front ends, and the water inlets of the No. 1 secondary water-cooled wall, the No. 2 secondary water-cooled wall and the No. 3 secondary water-cooled wall The water outlets of the No. 1 secondary water-cooled wall, the No. 2 secondary water-cooled wall and the No. 3 secondary water-cooled wall are arranged at their respective front ends, the water inlets of the No. 1 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall are arranged at their respective front ends, the water outlets of the No. 1 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall are arranged at their respective rear ends, the water inlets of the No. 2 tertiary water-cooled wall and the No. 3 tertiary water-cooled wall are arranged at their respective front ends, and the water outlets of the No. 2 tertiary water-cooled wall and the No. 3 tertiary water-cooled wall are arranged at their respective rear ends; the water outlet of the No. 1 tertiary water-cooled wall is connected with the water inlet of the No. 3 tertiary water-cooled wall; the water outlet of the No. 3 tertiary water-cooled wall is divided into two ways, one of which is connected to the No. 2 secondary water-cooled wall. The water inlet of the No. 4 third-level water-cooled wall is connected, and the other is connected to the water inlet of the No. 3 second-level water-cooled wall; the water outlet of the No. 2 third-level water-cooled wall is divided into two ways, one of which is connected to the water inlet of the No. 2 second-level water-cooled wall, and the other is connected to the water inlet of the No. 1 second-level water-cooled wall; the water outlet of the No. 1 second-level water-cooled wall is connected to the water inlet of the No. 1 first-level water-cooled wall, and the water outlet of the No. 3 second-level water-cooled wall is connected to the water inlet of the No. 2 first-level water-cooled wall; the water outlet of the No. 2 second-level water-cooled wall is divided into two ways, one of which is connected to the water inlet of the No. 1 first-level water-cooled wall, and the other is connected to the water inlet of the No. 2 first-level water-cooled wall. To ensure that the water-cooled wall added in the combustion chamber absorbs heat evenly, a cross-flow mode is adopted to ensure that the water temperature on both sides absorbs heat the same.

[0051] It can be seen from the above scheme that the present invention improves the structural strength of the combustion chamber and reduces the impact vibration of the pulsation generated by the combustion of gas fuel on the surrounding of the combustion chamber by arranging a suitable water-cooled wall in the furnace. On the other hand, the radiation heating surface in the furnace is increased. Under the condition of combustion equipment of equal capacity, the convection heating surface can be greatly reduced, the cost can be reduced, and the economic benefits of the equipment manufacturer are improved. It has the characteristics of simple process flow, mature equipment, low investment cost, good economic benefits, etc., and completely solves the current problems of combustion chamber vibration, large amount of manufacturing equipment consumables, and poor economic benefits. In order to ensure the high efficiency of the device of the present invention, a suitable water-cooled wall is arranged in the combustion chamber to increase the radiation heating surface in the combustion chamber. Under the condition of combustion equipment of equal capacity, the convection heating surface can be greatly reduced. The water-cooled wall of the combustion chamber is arranged in a suitable position to ensure that the strength of the combustion chamber is enhanced and the vibration is reduced. In addition, the wall surface should not be increased too much, which will increase the resistance of the combustion chamber and increase the power consumption.

Claims

1. A gas fuel combustion chamber with a vibration prevention structure, characterized in that: It comprises a furnace, a burner (1) is provided at the inlet of the furnace, and the furnace is provided with a flame mixing combustion section and a combustion flame pressure pulsation section in sequence from the inlet to the outlet; When one burner (1) is arranged on the furnace, at least two levels of water-cooled walls are arranged in the combustion flame pressure pulsation section along the direction from the furnace inlet to the outlet; when two or more burners (1) are arranged on the furnace, a first-level water-cooled wall (3) is arranged between two adjacent burners (1) in the flame mixing combustion section of the furnace, and at least two levels of water-cooled walls are arranged in the combustion flame pressure pulsation section along the direction from the furnace inlet to the outlet; wherein the plane where the first-level water-cooled wall (3) is located and the plane where the water-cooled walls of each level in the combustion flame pressure pulsation section are located are parallel to the direction from the furnace inlet to the outlet; when two or more burners (1) are arranged on the furnace, the first-level water-cooled wall in the combustion flame pressure pulsation section is arranged as follows: the first-level water-cooled wall is arranged on both sides of the tail of each first-level water-cooled wall (3); When one burner (1) is arranged on the furnace, or when two or more burners (1) are arranged on the furnace, in the combustion flame pressure pulsation section, both sides of the tail of each preceding water-cooled wall are provided with a succeeding water-cooled wall, and the front end of the succeeding water-cooled wall is arranged at a position not exceeding the tail of the preceding water-cooled wall; The upper ends of the primary water-cooled wall (3) and the water-cooled walls of each level in the combustion flame pressure pulsation section are connected to the upper part of the furnace, and the lower ends are connected to the lower part of the furnace.

2. A gas fuel combustion chamber with a vibration prevention structure according to claim 1, characterized in that: When more than two burners (1) are arranged on the furnace, the first-level water-cooled wall (3) is arranged in the middle of two adjacent burners (1) in the flame mixing combustion section of the furnace, and the tail of the first-level water-cooled wall (3) extends to the end of the flame mixing combustion section.

3. A gas fuel combustion chamber with a vibration prevention structure according to claim 1, characterized in that: When a burner (1) is arranged on the furnace, the first-stage water-cooled wall in the combustion flame pressure pulsation section is arranged on the axis of the burner (1).

4. A gas fuel combustion chamber with a vibration prevention structure according to any one of claims 1 to 3, characterized in that: All water-cooled walls of the same level of water-cooled walls within the combustion flame pressure pulsation section are respectively distributed at equal positions in the width direction of the furnace, and the number of equal positions is the total number of water-cooled walls of the same level of water-cooled walls plus one.

5. A gas fuel combustion chamber with a vibration prevention structure according to claim 1, characterized in that: The length of the flame mixing and combustion section from the furnace inlet to the furnace outlet is 1 / 4 to 1 / 3 times the furnace depth.

6. A gas fuel combustion chamber with a vibration prevention structure according to claim 1 or 5, characterized in that: Two levels of water-cooled walls are arranged in the combustion flame pressure pulsation section along the direction from the furnace inlet to the furnace outlet. The two levels of water-cooled walls are respectively referred to as the secondary water-cooled wall (4) and the tertiary water-cooled wall (5); The secondary water-cooled wall (4) is arranged from 1 / 3 to 1 / 2 of the furnace depth in the direction from the furnace inlet to the furnace outlet in the combustion flame pressure pulsation section, and the tertiary water-cooled wall (5) is arranged from 1 / 2 to 3 / 3 of the furnace depth.

7. A gas fuel combustion chamber with a vibration prevention structure according to claim 6, characterized in that: The thickness of the primary water-cooled wall (3) and the water-cooled walls of each level in the combustion flame pressure pulsation section is the same as the thickness of the water-cooled walls around the combustion chamber, and the thickness direction of the water-cooled wall is the width direction of the furnace.

8. A gas fuel combustion chamber with a vibration prevention structure according to claim 6, characterized in that: When a burner (1) is arranged on the furnace, one secondary water-cooled wall (4) is arranged, and two tertiary water-cooled walls (5) are arranged; a water inlet of the tertiary water-cooled wall (5) is arranged at the rear of the tertiary water-cooled wall (5), and a water outlet of the tertiary water-cooled wall (5) is arranged at the front end of the tertiary water-cooled wall (5); a water inlet of the secondary water-cooled wall (4) is arranged at the rear of the secondary water-cooled wall (4), and a water outlet of the secondary water-cooled wall (4) is arranged at the front end of the secondary water-cooled wall (4); and the water outlets of the two tertiary water-cooled walls (5) are connected to the water inlet of the secondary water-cooled wall (4).

9. A gas fuel combustion chamber with a vibration prevention structure according to claim 6, characterized in that: When two burners (1) are arranged on the furnace, one first-stage water-cooled wall (3) is arranged, two second-stage water-cooled walls (4) are arranged, and four third-stage water-cooled walls (5) are arranged; The two secondary water-cooled walls (4) are respectively recorded as the No. 1 secondary water-cooled wall and the No. 2 secondary water-cooled wall, and the four tertiary water-cooled walls (5) are respectively recorded as the No. 1 tertiary water-cooled wall, the No. 2 tertiary water-cooled wall, the No. 3 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall, wherein the No. 1 tertiary water-cooled wall and the No. 2 tertiary water-cooled wall are respectively arranged on both sides of the tail of the No. 1 secondary water-cooled wall, and the No. 3 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall are respectively arranged on both sides of the tail of the No. 2 secondary water-cooled wall; The water inlet of the primary water-cooled wall (3) is arranged at the tail of the primary water-cooled wall (3), the water outlet of the primary water-cooled wall (3) is arranged at the front end of the primary water-cooled wall (3), the water inlets of the No. 1 secondary water-cooled wall and the No. 2 secondary water-cooled wall are both arranged at their respective tails, the water outlets of the No. 1 secondary water-cooled wall and the No. 2 secondary water-cooled wall are arranged at their respective front ends, the water inlets of the No. 1 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall are arranged at their respective tails, the water outlets of the No. 1 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall are arranged at their respective front ends, the water inlets of the No. 2 tertiary water-cooled wall and the No. 3 tertiary water-cooled wall are arranged at their respective front ends, and the water outlets of the No. 2 tertiary water-cooled wall and the No. 3 tertiary water-cooled wall are arranged at their respective tails; The water outlet of the No. 1 third-stage water-cooled wall, the water inlet of the No. 3 third-stage water-cooled wall, the water inlet of the No. 2 second-stage water-cooled wall and the water inlet of the first-stage water-cooled wall (3) are connected in sequence; the water outlet of the No. 4 third-stage water-cooled wall, the water inlet of the No. 2 third-stage water-cooled wall, the water inlet of the No. 1 second-stage water-cooled wall and the water inlet of the first-stage water-cooled wall (3) are connected in sequence.

10. A gas fuel combustion chamber with a vibration prevention structure according to claim 6, characterized in that: When three burners (1) are arranged on the furnace, two of the first-stage water-cooled walls (3) are arranged, three of the second-stage water-cooled walls (4) are arranged, and four of the third-stage water-cooled walls (5) are arranged; The two primary water-cooled walls (3) are respectively recorded as the No. 1 primary water-cooled wall and the No. 2 primary water-cooled wall, the three secondary water-cooled walls (4) are respectively recorded as the No. 1 secondary water-cooled wall, the No. 2 secondary water-cooled wall and the No. 3 secondary water-cooled wall, and the four tertiary water-cooled walls (5) are respectively recorded as the No. 1 tertiary water-cooled wall, the No. 2 tertiary water-cooled wall, the No. 3 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall, wherein the No. 1 secondary water-cooled wall and the No. 2 secondary water-cooled wall are respectively arranged on both sides of the tail of the No. 1 primary water-cooled wall, the No. 2 secondary water-cooled wall and the No. 3 secondary water-cooled wall are respectively arranged on both sides of the tail of the No. 2 primary water-cooled wall, the No. 1 tertiary water-cooled wall and the No. 2 tertiary water-cooled wall are respectively arranged on both sides of the tail of the No. 1 secondary water-cooled wall, the No. 2 tertiary water-cooled wall and the No. 3 tertiary water-cooled wall are respectively arranged on both sides of the tail of the No. 2 secondary water-cooled wall, and the No. 3 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall are respectively arranged on both sides of the tail of the No. 3 secondary water-cooled wall; The water inlets of the No. 1 primary water-cooled wall and the No. 2 primary water-cooled wall are arranged at their respective tails, the water outlets of the No. 1 primary water-cooled wall and the No. 2 primary water-cooled wall are arranged at their respective front ends, the water inlets of the No. 1 secondary water-cooled wall, the No. 2 secondary water-cooled wall and the No. 3 secondary water-cooled wall are all arranged at their respective tails, the water outlets of the No. 1 secondary water-cooled wall, the No. 2 secondary water-cooled wall and the No. 3 secondary water-cooled wall are arranged at their respective front ends, the water inlets of the No. 1 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall are arranged at their respective front ends, the water outlets of the No. 1 tertiary water-cooled wall and the No. 4 tertiary water-cooled wall are arranged at their respective tails, the water inlets of the No. 2 tertiary water-cooled wall and the No. 3 tertiary water-cooled wall are arranged at their respective front ends, and the water outlets of the No. 2 tertiary water-cooled wall and the No. 3 tertiary water-cooled wall are arranged at their respective tails; The water outlet of the No. 1 third-stage water-cooled wall is connected with the water inlet of the No. 3 third-stage water-cooled wall; the water outlet of the No. 3 third-stage water-cooled wall is divided into two paths, one of which is connected with the water inlet of the No. 2 second-stage water-cooled wall, and the other is connected with the water inlet of the No. 3 second-stage water-cooled wall; the water outlet of the No. 4 third-stage water-cooled wall is connected with the water inlet of the No. 2 third-stage water-cooled wall; the water outlet of the No. 2 third-stage water-cooled wall is divided into two paths, one of which is connected with the water inlet of the No. 2 second-stage water-cooled wall, and the other is connected with the water inlet of the No. 1 second-stage water-cooled wall; the water outlet of the No. 1 second-stage water-cooled wall is connected with the water inlet of the No. 1 first-stage water-cooled wall, and the water outlet of the No. 3 second-stage water-cooled wall is connected with the water inlet of the No. 2 first-stage water-cooled wall; the water outlet of the No. 2 second-stage water-cooled wall is divided into two paths, one of which is connected with the water inlet of the No. 1 first-stage water-cooled wall, and the other is connected with the water inlet of the No. 2 first-stage water-cooled wall.

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