Gas-fuel combustion chamber having vibration control structure

Abstract

Disclosed in the present invention is a gas-fuel combustion chamber having a vibration control structure. The gas-fuel combustion chamber comprises a furnace chamber, the furnace chamber being sequentially divided, in a direction from an inlet thereof to an outlet thereof, into a flame mixed combustion section and a combustion flame pressure pulsation section, and the combustion flame pressure pulsation section being internally provided with at least two stages of water-cooled walls. When two or more burners are provided on the furnace chamber, first-stage water-cooled walls are provided; when one burner is provided on the furnace chamber, no first-stage water-cooled wall is provided; when two or more burners are provided on the furnace chamber, the arrangement form of the first-stage water-cooled walls in the combustion flame pressure pulsation section is as follows: both sides of the tail of each first-stage water-cooled wall are provided with first-stage water-cooled walls; in the combustion flame pressure pulsation section, both sides of the tail of each preceding-stage water-cooled wall are provided with subsequent-stage water-cooled walls; and all the water-cooled walls are connected to the furnace chamber. By arranging water-cooled walls at appropriate locations inside the furnace chamber, the present invention can effectively address vibration of combustion chambers, and reduce consumption of consumables for combustion apparatuses of the same capacity.

Description

A gas fuel combustion chamber with a vibration prevention structure 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] Due to their enormous chemical energy content, gaseous fuels provide over 50% of the world's primary energy. The energy generated by the combustion of these fuels is used not only in industry but also in transportation, agriculture, and consumer applications. Although alternative energy sources such as wind and solar power are increasingly contributing to the overall energy mix, their relatively low efficiency and absolute proportion are relatively small. For the next decade or so, energy will continue to primarily come from combustion. Current ultra-low nitrogen combustion modes, primarily based on gaseous fuels, are prone to generating pressure pulsations within the combustion chamber, which can affect the surrounding walls of the combustion chamber and other equipment, causing vibration. When the frequency of pressure pulsations aligns with the natural frequency of industrial combustion equipment, equipment resonance can occur, seriously endangering the safe and stable operation and lifespan of the equipment. Currently, existing technologies lack specific means to prevent and control vibrations associated with gaseous fuel combustion. Addressing the varying vibrations caused by pressure pulsations across different furnace types could significantly reduce operator safety concerns and equipment damage caused by vibration, maximizing safety and efficiency. 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.

[0003] Summary of the Invention

[0004] 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.

[0005] The technical solution adopted in the present invention is as follows:

[0006] 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;

[0007] When one burner is provided on the furnace, at least two stages of water-cooled walls are provided in the combustion flame pressure pulsation section along the direction from the furnace inlet to the outlet; when two or more burners are provided on the furnace, a primary water-cooled wall is provided between two adjacent burners in the flame mixing and combustion section, and at least two stages of water-cooled walls are provided in the combustion flame pressure pulsation section along the direction from the furnace inlet to the outlet; wherein the plane on which the primary water-cooled wall is located and the plane on which the water-cooled walls of each stage in the combustion flame pressure pulsation section are located are parallel to the direction from the furnace inlet to the outlet;

[0008] When more than two burners are provided 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 provided on both sides of the tail of each first-stage water-cooled wall;

[0009] When one burner or two or more burners are provided on the furnace, in the combustion flame pressure pulsation section, the rear end of each preceding water-cooled wall is provided with a rear water-cooled wall on both sides, and the front end of the rear water-cooled wall is arranged at a position not exceeding the rear end of the preceding water-cooled wall;

[0010] The upper ends of the first-level 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.

[0011] Preferably, when more than two burners are provided on the furnace, the first-level water-cooled wall is provided between two adjacent burners in the flame mixing combustion section of the furnace, and the tail of the first-level water-cooled wall extends to the end of the flame mixing combustion section.

[0012] Preferably, when a burner is provided on the furnace, the first-stage water-cooled wall in the combustion flame pressure pulsation section is provided on the axis of the burner.

[0013] Preferably, all water-cooled walls in the same level of water-cooled walls within the combustion flame pressure pulsation section are respectively distributed in equal parts 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 of water-cooled walls plus one.

[0014] Preferably, the length of the flame mixing and combustion section from the furnace inlet to the furnace outlet is times the furnace depth.

[0015] Preferably, two levels of water-cooled walls are provided 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;

[0016] Among them, the secondary water-cooled wall is set from 1 / 3 to 1 / 2 of the furnace depth in the direction from the furnace inlet to the outlet in the combustion flame pressure pulsation section, and the tertiary water-cooled wall is set from 1 / 2 to 3 / 3 of the furnace depth.

[0017] Preferably, the thickness of the primary water-cooled wall and the water-cooled walls at all levels 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.

[0018] Preferably, when a burner is provided on the furnace, one secondary water-cooled wall is provided, and two tertiary water-cooled walls are provided, the water inlet of the tertiary water-cooled wall is provided at the tail of the tertiary water-cooled wall, the water outlet of the tertiary water-cooled wall is provided at the front end of the tertiary water-cooled wall, the water inlet of the secondary water-cooled wall is provided at the tail of the secondary water-cooled wall, the water outlet of the secondary water-cooled wall is provided at the front end of the secondary water-cooled wall, and the water outlets of the two tertiary water-cooled walls are connected to the water inlet of the secondary water-cooled wall.

[0019] Preferably, when two burners are provided on the furnace, one primary water-cooled wall is provided, two secondary water-cooled walls are provided, and four tertiary water-cooled walls are provided;

[0020] 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. Among them, 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;

[0021] The water inlet of the first-stage water-cooled wall is arranged at the rear end of the first-stage water-cooled wall, the water outlet of the first-stage water-cooled wall is arranged at the front end of the first-stage 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 rear ends, 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 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 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;

[0022] 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.

[0023] Preferably, when three burners are provided on the furnace, two first-stage water-cooled walls are provided, three second-stage water-cooled walls are provided, and four third-stage water-cooled walls are provided;

[0024] 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;

[0025] The water inlets of the No. 1 primary water-cooled wall and the No. 2 primary water-cooled wall are arranged at their respective rear ends, 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 rear ends, 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 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 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;

[0026] 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.

[0027] The present invention has the following beneficial effects:

[0028] 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. These water-cooled walls, on the one hand, improve the structural strength of the combustion chamber and reduce the impact vibration of the combustion chamber caused by the pulsation generated by the combustion of gas fuel. 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 to the existing furnace structure to solve the combustion chamber vibration and greatly reduce the use of consumables. Therefore, the gas fuel combustion chamber is safer, and the investment cost is low and the economic benefits are good. It completely solves the current problems of combustion chamber vibration, large amount of manufacturing equipment consumables, and poor economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG1(a) is a schematic diagram of the structure of a combustion chamber in which two burners are arranged in an embodiment of the present invention; FIG1(b) is a cross-sectional view of the embodiment shown in FIG1(a); FIG1(b) is a distribution diagram of vibration measurement points in the embodiment shown in FIG1(a); FIG1(d) is a diagram of vibration data at different positions of a 116MW combustion chamber of a power plant before modification; FIG1(e) is a diagram of vibration data at different positions of the 116MW combustion chamber of the power plant after modification according to the technical solution of the present invention;

[0030] FIG2( a ) is a schematic structural diagram 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 );

[0031] FIG3( a ) is a schematic structural diagram of a combustion chamber in an embodiment of the present invention in which only one burner is arranged; FIG3( b ) is a cross-sectional view of the embodiment shown in FIG3( a ).

[0032] Among them: 1 is the burner; 2 is the combustion chamber; 3 is the first-stage water-cooled wall; 4 is the second-stage water-cooled wall; 5 is the third-stage water-cooled wall; 6 is the combustion chamber outlet. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] 1(a) to 3(b), a gas fuel combustion chamber with a vibration prevention structure according to the present invention includes a furnace, a burner 1 is provided at the inlet of the furnace, and the furnace and the burner together constitute a combustion chamber 2. Gas fuel and air are mixed and burned in the furnace through the burner 1 to generate a high-temperature flame and high-temperature flue gas, 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 sections B and C in FIG1(b), wherein sections B and C together constitute the combustion flame pressure pulsation section) along the direction from the inlet to the outlet (see the direction from top to bottom in FIG1(b));

[0035] Referring to Figures 3(a) and 3(b), when one burner 1 is provided on the furnace, at least two stages of water-cooled walls are provided in the combustion flame pressure pulsation section along the direction from the furnace inlet to the outlet. In this case, no primary water-cooled wall 3 is provided in the flame mixing combustion section of the furnace. Referring to Figures 1(a) to 2(b), when two or more burners 1 are provided on the furnace, a primary water-cooled wall 3 is provided between two adjacent burners 1 in the flame mixing combustion section of the furnace, and at least two stages of water-cooled walls are provided in the combustion flame pressure pulsation section along the direction from the furnace inlet to the outlet. The plane on which the primary water-cooled wall 3 and the planes on which the water-cooled walls of each stage in the combustion flame pressure pulsation section are provided are parallel to the direction from the furnace inlet to the outlet.

[0036] Referring to Figures 1(a) to 2(b), when two or more burners 1 are installed 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 provided on both sides of the tail end (the lower end as shown in Figure 2(b)) of each first-stage water-cooled wall 3;

[0037] Referring to Figures 1(a) to 3(b), when one burner 1 is provided on the furnace and when two or more burners 1 are provided on the furnace, in the combustion flame pressure pulsation section, the water-cooled wall setting principles for providing one burner 1 and providing two burners are the same, that is, both sides of the tail of each previous water-cooled wall are provided with the next water-cooled wall, see Figures 1(a) to 2(b), the front end of the next 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 next 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 and right directions;

[0038] The upper ends of the above-mentioned first-level 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 the form of fixed connection.

[0039] The high-temperature flame and flue gas of the burner 1 pass through the first-stage water-cooled wall 3 and the water-cooled walls of each stage in the combustion flame pressure pulsation section in sequence, and are finally discharged through the combustion chamber outlet (6).

[0040] As an optional embodiment of the present invention, referring to FIG1(a) and FIG2(b), when two or more 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 front end of the first-level water-cooled wall 3 is connected to the front 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 impact on the combustion of the burner as much as possible, ensure the stability of the combustion flame in the initial stage of mixed combustion, and ensure the stability of the flame mixing combustion section.

[0041] As an optional embodiment of the present invention, referring to FIG. 3( a ) and FIG. 3 ( b ), when a burner 1 is provided on the furnace, the first-stage water-cooled wall in the combustion flame pressure pulsation section is provided on the axis of the burner 1 . In this case, only one secondary water-cooled wall is actually provided.

[0042] 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, referring to Figure 1(b), the two secondary water-cooled walls 4 are located at the three-division positions of the furnace section B, and the four tertiary water-cooled walls 5 are respectively located at the five-division positions of the furnace section C.

[0043] As a preferred embodiment of the present invention, referring to Figures 1(b), 2(b), and 3(b), the flame mixing and combustion section is the main flame region of the burner. The length of this section from the furnace inlet to the furnace outlet is 1 / 4 to 1 / 3 of the furnace depth. In other words, the length A of section A satisfies the following relationship: 1 / 3 of the furnace depth D ≥ A ≥ 1 / 4 of the furnace depth D. This distance ensures the stability of the burner flame during the initial stages of mixed combustion, ensuring stability of the flame mixing and combustion section.

[0044] 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 can easily lead to 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 these 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, 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, furnace section B begins at 1 / 3 of the furnace depth and ends at 1 / 2 of the furnace depth; furnace section C begins at 1 / 2 of the furnace depth and ends at 2 / 3 of the furnace depth. Furnace section B is the region of combustion flame pressure pulsation and amplification, and installing a secondary water-cooled wall 4 can effectively increase strength and reduce vibration. Furnace section C is the region of maximum combustion flame pressure pulsation and amplification, and therefore, the number of tertiary water-cooled walls 5 is the largest, increasing strength and effectively reducing vibration.

[0045] As a preferred embodiment of the present invention, the thickness of the first-stage 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.

[0046] 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, as this 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, while minimizing the resistance brought to the combustion chamber by the addition of water-cooled walls.

[0047] 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:

[0048] Referring to Figure 3(b), in the case of a single burner 1 installed in the furnace, one secondary water-cooled wall 4 and two tertiary water-cooled walls 5 are provided. The water inlet of the tertiary water-cooled wall 5 is located at the rear end of the tertiary water-cooled wall 5, and the water outlet of the tertiary water-cooled wall 5 is located at the front end of the tertiary water-cooled wall 5. The water inlet of the secondary water-cooled wall 4 is located at the rear end of the secondary water-cooled wall 4, and the water outlet of the secondary water-cooled wall 4 is located at the front end of the secondary water-cooled wall 4. The water outlets of the two tertiary water-cooled walls 5 are connected to the water inlet of the secondary water-cooled wall 4. To ensure uniform heat absorption by the water-cooled walls added to the combustion chamber, a cross-flow pattern is adopted to ensure that the water temperature on both sides absorbs the same heat.

[0049] Referring to FIG1(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, among which 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, and the No. 1 secondary water-cooled wall and the No. 2 secondary water-cooled wall are respectively arranged at the front end of the primary water-cooled wall The water inlets of the first-stage water-cooled walls are all arranged at their respective tails, the water outlets of the No. 1 second-stage water-cooled wall and the No. 2 second-stage water-cooled wall are arranged at their respective front ends, the water inlets of the No. 1 third-stage water-cooled wall and the No. 4 third-stage water-cooled wall are arranged at their respective front ends, the water outlets of the No. 1 third-stage water-cooled wall and the No. 4 third-stage water-cooled wall are arranged at their respective tails, the water inlets of the No. 2 third-stage water-cooled wall and the No. 3 third-stage water-cooled wall are arranged at their respective front ends, and the water outlets of the No. 2 third-stage water-cooled wall and the No. 3 third-stage 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 No. 1 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 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.

[0050] Taking a 116MW combustion chamber of a power plant with two burners 1 installed on the furnace as an example, it was modified according to the present invention. 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 measurement points is shown in Figure 1(c). The vibration measurement points are set on the upper wall of the combustion chamber. There are three rows of nine measurement points in total. The first row of measurement points is located at a distance of 4m from the burner (the three measurement points are respectively recorded as 4m-1, 4m-2 and 4m-3). The second row of measurement points is located at a distance of 7.5m from the burner. The first row of measuring points is located at 7.5 m (3 m - 1, 7.5 m - 2, and 7.5 m - 3). The third row of measuring points is located 9 m from the burner (3 m - 1, 9 m - 2, and 9 m - 3). Figures 1(d) and 1(e) show that the technical solution of the present invention significantly reduces combustion chamber vibration. A comparison of vibration intensity values ​​before and after the modification shows that the technical solution of the present invention reduces vibration by approximately 70%, significantly alleviating damage to the equipment caused by vibration.

[0051] Referring to FIG2(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 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 respectively arranged on both sides of the tail of the No. 1 primary water-cooled wall. 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-stage water-cooled wall and the No. 2 third-stage water-cooled wall are respectively arranged on both sides of the tail of the No. 1 secondary water-cooled wall, the No. 2 third-stage water-cooled wall and the No. 3 third-stage water-cooled wall are respectively arranged on both sides of the tail of the No. 2 secondary water-cooled wall, the No. 3 third-stage water-cooled wall and the No. 4 third-stage 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 are respectively arranged at their respective front ends. 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 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 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 to 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 tertiary water-cooled wall is connected to the water inlet of the No. 2 tertiary water-cooled wall; the water outlet of the No. 2 tertiary water-cooled wall is divided into two routes, one of which is connected to the water inlet of the No. 2 secondary water-cooled wall and the other is connected to the water inlet of the No. 1 secondary water-cooled wall; the water outlet of the No. 1 secondary water-cooled wall is connected to the water inlet of the No. 1 primary water-cooled wall, and the water outlet of the No. 3 secondary water-cooled wall is connected to the water inlet of the No. 2 primary water-cooled wall; the water outlet of the No. 2 secondary water-cooled wall is divided into two routes, one of which is connected to the water inlet of the No. 1 primary water-cooled wall and the other is connected to the water inlet of the No. 2 primary water-cooled wall. To ensure uniform heat absorption of the water-cooled walls added to the combustion chamber, a cross-flow pattern is adopted to ensure that the water temperature on both sides absorbs the same heat.

[0052] As can be seen from the above scheme, the present invention, by arranging suitable water-cooled walls within the furnace, improves the structural strength of the combustion chamber and reduces the impact vibration on the surrounding areas of the combustion chamber caused by the pulsation generated by the combustion of gas fuel. It also increases the radiation heating surface within the furnace. Under the conditions of combustion equipment of equal capacity, it can greatly reduce the convection heating surface consumables, reduce costs, and improve the economic benefits of the equipment manufacturer. It has the characteristics of a simple process flow, mature equipment, low investment costs, and good economic benefits. It completely solves the current problems of combustion chamber vibration, large manufacturing equipment consumables, and poor economic returns. To ensure the high efficiency of the device of the present invention, suitable water-cooled walls are arranged within the combustion chamber to increase the radiation heating surface within the combustion chamber. Under the conditions of combustion equipment of equal capacity, it can greatly reduce the convection heating surface consumables. The water-cooled walls of the combustion chamber are arranged in appropriate positions to ensure that the strength of the combustion chamber is enhanced and vibration is reduced. Furthermore, the wall surface should not be increased too much, which would 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 sequentially provided with a flame mixing combustion section and a combustion flame pressure pulsation section along the direction 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 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; 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 of each first-stage 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 previous stage water-cooled wall are provided with a next stage water-cooled wall, and the front end of the next stage water-cooled wall is arranged at a position not exceeding the tail of the previous stage 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, and the two levels of water-cooled walls are respectively denoted 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 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 denoted 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 They are respectively recorded as No. 1 three-stage water-cooled wall, No. 2 three-stage water-cooled wall, No. 3 three-stage water-cooled wall and No. 4 three-stage water-cooled wall, wherein No. 1 three-stage water-cooled wall and No. 2 three-stage water-cooled wall are respectively arranged on both sides of the tail of No. 1 two-stage water-cooled wall, and No. 3 three-stage water-cooled wall and No. 4 three-stage water-cooled wall are respectively arranged on both sides of the tail of No. 2 two-stage 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 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 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 tertiary water-cooling wall, the water inlet of the No. 3 tertiary water-cooling wall, the water inlet of the No. 2 secondary water-cooling wall and the water inlet of the first water-cooling wall (3) are connected in sequence; the water outlet of the No. 4 tertiary water-cooling wall, the water inlet of the No. 2 tertiary water-cooling wall, the water inlet of the No. 1 secondary water-cooling wall and the water inlet of the first water-cooling 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 first-stage water-cooled walls (3) are arranged, three second-stage water-cooled walls (4) are arranged, and four 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 stage 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 stage 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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