An ultra-supercritical burner arrangement structure

Abstract

This utility model discloses an ultra-supercritical burner arrangement structure, including a combustion chamber, which is divided into a main combustion zone, a co-combustion zone, and a burnout zone from bottom to top. The front and rear sides of the combustion chamber are respectively the front wall and the rear wall. The main combustion zone is equipped with a first pulverized coal burner, a primary burnout air channel, and a primary air duct. In this utility model, the biomass burner and the second pulverized coal burner are not opposed to each other, and the relative biomass burners are staggered, which can extend the biomass flame path and preheat in the preheating chamber in advance, thereby improving the carbon conversion rate of biomass fuel and solving the problem of difficult burnout of biomass fuel. Furthermore, by controlling the primary burnout air channel and the secondary burnout air channel, oxygen-deficient combustion is carried out in the main combustion zone, supplementary combustion is carried out in the co-combustion zone, and the burnout zone is further controlled by controlling the first OFA channel and the second OFA channel to further improve the burnout rate, which can effectively reduce NOx emissions.

Description

Technical Field

[0001] This utility model relates to the field of ultra-supercritical burner arrangement technology, and in particular to an ultra-supercritical burner arrangement structure. Background Technology

[0002] The specific direction of power transformation—"building a new power system with new energy as the mainstay"—has been further clarified. New energy sources, represented by wind and solar power, will gradually become the main power source. However, wind and solar power are intermittent and unstable power sources, and their power supply requires support and guarantee from thermal power plants with regulation capabilities. This new situation presents an unprecedented challenge to existing coal-fired power plants. They must not only transform into "low-carbon" power sources but also shift from a power supply-guaranteed mainstay power source to a regulation-oriented power source. Biomass is a "zero-carbon" fuel, making the co-firing of biomass into coal-fired power plants of great significance. Co-firing biomass into coal-fired power plants is beneficial for CO2 emission reduction. Using ultra-supercritical burners in coal-fired power plants to co-fire biomass can effectively reduce the carbon emission intensity and NOx generation of coal-fired power plants. However, the existing ultra-supercritical burner layout still has certain shortcomings.

[0003] In the existing ultra-supercritical burner layout, the biomass burner and pulverized coal burner are mostly symmetrically opposed or integrated, which limits the biomass flame path, affects the carbon conversion rate of biomass fuel, and makes it difficult for biomass fuel to burn completely.

[0004] Furthermore, in the existing ultra-supercritical burner layout, the burnout air passage is mostly a single design, which makes it difficult to improve the burnout rate of the co-burned fuel and increases NOx emissions.

[0005] Therefore, it is necessary to design an ultra-supercritical burner arrangement structure. Utility Model Content

[0006] The purpose of this invention is to provide an ultra-supercritical burner arrangement structure to address the problems in existing ultra-supercritical burner arrangements where biomass burners and pulverized coal burners are mostly symmetrically opposed or integrated, resulting in limited biomass flame paths, affecting the carbon conversion rate of biomass fuel, making it difficult for biomass fuel to burn completely, and the fact that most burnout air channels are single designs, making it difficult to improve the burnout rate of co-fired fuels, thus increasing NOx emissions.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an ultra-supercritical burner arrangement structure, including a combustion furnace, wherein the combustion furnace is divided into a main combustion zone, a co-combustion zone and a burnout zone from bottom to top, and the front and rear sides of the combustion furnace are respectively a front wall and a rear wall. The combustion furnace is used to provide combustion space and optimize the combustion stage by zone. The front wall and the rear wall are used to install the burner and the air duct and support flame counter-current.

[0008] The main combustion zone is equipped with a first pulverized coal burner, a primary burnout air duct, and a primary air duct. The first pulverized coal burner is located between the primary burnout air duct and the primary air duct. The primary air duct is located at the bottom outside the main combustion zone. The first pulverized coal burner is used for the main combustion of pulverized coal and provides the basic heat load. The primary burnout air duct is used to supply air to suppress NOx generation in the main combustion zone.

[0009] The co-firing zone is equipped with a second pulverized coal burner, a biomass burner, and a secondary air duct. The second pulverized coal burner and the biomass burner are located above the secondary air duct. The secondary air duct is connected to the combustion furnace and provides combustion air to the pulverized coal and biomass in the co-firing zone.

[0010] The burnout zone is equipped with a secondary burnout air channel, and both the primary burnout air channel and the secondary burnout air channel are connected to the combustion furnace.

[0011] The primary air duct outlet is connected to the inlet of the first pulverized coal burner and the second pulverized coal burner. The primary air duct provides primary air and transports pulverized coal to the first pulverized coal burner and the second pulverized coal burner.

[0012] As a further technical solution of this utility model, the first pulverized coal burner is arranged in multiple layers in the front wall and the rear wall, and an oil gun is provided in the first pulverized coal burner. The first pulverized coal burner is connected to the combustion furnace, and the oil gun is used for cold ignition in the first pulverized coal burner to ensure the initial combustion stability of pulverized coal.

[0013] As a further technical solution of this utility model, the second pulverized coal burner and the biomass burner are arranged in multiple layers in the front wall and the rear wall, the biomass burner is located in the gap between the second pulverized coal burner, and the biomass burners arranged in the front wall and the rear wall are staggered. The second pulverized coal burner is used to supplement the combustion of unburned pulverized coal.

[0014] The biomass burner is equipped with a preheating chamber. Both the second pulverized coal burner and the biomass burner are connected to the combustion furnace. The biomass burner is connected to a feeder. The biomass pellets are injected into the combustion furnace after being heated in the preheating chamber. The preheating chamber is preheated by the heat provided by the main combustion zone.

[0015] As a further technical solution of this utility model, the secondary burnout air channel is disposed in the front wall and the rear wall, and the secondary burnout air channel includes a first OFA channel and a second OFA channel;

[0016] The first OFA channel is located above the second OFA channel. The first OFA channel is inclined downward at one end relative to the combustion furnace, while the second OFA channel is horizontal. The first OFA channel provides high-speed airflow to penetrate the flue gas, increasing the residence time of the fuel and forcing complete combustion. The second OFA channel stabilizes the flow field and prevents the flame from going out.

[0017] As a further technical solution of this utility model, both the primary air duct and the secondary air duct are installed in the front wall and the rear wall.

[0018] As a further technical solution of this utility model, a flue gas return port is provided in the rear wall. The flue gas return port is located between the primary air duct and the first pulverized coal burner. The flue gas return port introduces low-temperature flue gas to regulate the temperature of the combustion furnace.

[0019] As a further technical solution of this utility model, the secondary air duct is located above the primary burnout air duct.

[0020] The advantages of the ultra-supercritical burner arrangement structure provided by this utility model are as follows:

[0021] By using a non-opposing arrangement between the biomass burner and the second pulverized coal burner, and by staggering the relative arrangement of the biomass burners, the biomass flame path can be extended, ensuring that the gaps in the second pulverized coal burner are filled, and preheating can be carried out in the preheating chamber in advance, thereby improving the carbon conversion rate of biomass fuel and solving the problem of biomass fuel being difficult to burn completely.

[0022] Furthermore, by controlling the primary and secondary burnout air channels, oxygen-deficient combustion is carried out in the main combustion zone, supplementary combustion is carried out in the co-combustion zone, and the burnout zone is further controlled by the first and second OFA channels to improve the burnout rate, which can effectively reduce NOx emissions. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the staggered arrangement structure of the biomass burner in this utility model.

[0026] In the diagram: 1. Combustion furnace;

[0027] 11. Main combustion zone; 111. First pulverized coal burner; 1111. Oil gun; 112. Primary burnout air duct; 113. Primary air duct;

[0028] 12. Blending zone; 121. Second pulverized coal burner; 122. Biomass burner; 1221. Preheating chamber; 123. Secondary air duct;

[0029] 13. Burnout Zone; 131. Secondary Burnout Air Channel; 1311. First OFA Channel; 1312. Second OFA Channel;

[0030] 2. Front wall;

[0031] 3. Rear wall; 31. Flue gas return outlet. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] Please see the appendix Figure 1 - Appendix Figure 2 The present invention provides an embodiment of an ultra-supercritical burner arrangement structure, including a combustion furnace 1, which is divided into a main combustion zone 11, a co-combustion zone 12 and a burnout zone 13 from bottom to top. The front and rear sides of the combustion furnace 1 are a front wall 2 and a rear wall 3, respectively. The combustion furnace 1 is used to provide combustion space and optimize the combustion stages by zone. The front wall 2 and the rear wall 3 are used to install the burner and the air duct and support the flame counter-current.

[0035] The main combustion zone 11 is equipped with a first pulverized coal burner 111, a primary burnout air passage 112, and a primary air duct 113. The first pulverized coal burner 111 is located between the primary burnout air passage 112 and the primary air duct 113. The primary air duct 113 is located at the bottom outside the main combustion zone 11. The first pulverized coal burner 111 is used for the main combustion of pulverized coal and provides the basic heat load. The primary burnout air passage 112 is used to supply air to suppress NOx generation in the main combustion zone 11. The first pulverized coal burner 111 is arranged in multiple layers in the front wall 2 and the rear wall 3. An oil gun 1111 is installed in the first pulverized coal burner 111. The first pulverized coal burner 111 is connected to the combustion furnace 1. The oil gun 1111 is used for cold ignition in the first pulverized coal burner 111 to ensure the initial combustion stability of pulverized coal.

[0036] The co-firing zone 12 is equipped with a second pulverized coal burner 121, a biomass burner 122, and a secondary air duct 123. The second pulverized coal burner 121 and the biomass burner 122 are located above the secondary air duct 123, which is located above the primary burnout air duct 112. The secondary air duct 123 is connected to the combustion furnace 1 and provides combustion air to the pulverized coal and biomass in the co-firing zone 12. The second pulverized coal burner 121 and the biomass burner 122 are arranged in multiple layers in the front wall 2 and the rear wall 3 for biomass combustion. The biomass burner 122 is located in the gap between the second pulverized coal burners 121, and the biomass burners 122 in the front wall 2 and the rear wall 3 are staggered. The second pulverized coal burners 121 are used to supplement the combustion of unburned pulverized coal. The biomass burner 122 is provided with a preheating chamber 1221. Both the second pulverized coal burner 121 and the biomass burner 122 are connected to the combustion furnace 1. The biomass burner 122 is connected to the feeder. The biomass pellets are injected into the combustion furnace 1 after being heated by the preheating chamber 1221. The preheating chamber 1221 is preheated by the heat provided by the main combustion zone 11.

[0037] A secondary burnout air passage 131 is provided at the burnout zone 13. Both the primary burnout air passage 112 and the secondary burnout air passage 131 are connected to the combustion furnace 1. The secondary burnout air passage 131 is located in the front wall 2 and the rear wall 3. The secondary burnout air passage 131 includes a first OFA passage 1311 and a second OFA passage 1312. The first OFA passage 1311 is located above the second OFA passage 1312. The first OFA passage 1311 is inclined downward at one end relative to the combustion furnace 1. The second OFA passage 1312 is horizontal. The first OFA passage 1311 provides high-speed airflow to penetrate the flue gas, increase the residence time of the fuel, and force burnout. The second OFA passage 1312 stabilizes the flow field and prevents the flame from going out.

[0038] The outlet of the primary air duct 113 is connected to the inlet of the first pulverized coal burner 111 and the second pulverized coal burner 121. The primary air duct 113 provides primary air and transports pulverized coal to the first pulverized coal burner 111 and the second pulverized coal burner 121. Both the primary air duct 113 and the secondary air duct 123 are located in the front wall 2 and the rear wall 3. A flue gas return port 31 is provided in the rear wall 3. The flue gas return port 31 is located between the primary air duct 113 and the first pulverized coal burner 111. The flue gas return port 31 introduces low-temperature flue gas to regulate the temperature of the combustion furnace 1.

[0039] Specifically, in use, the air-powder mixture is first transported to the first pulverized coal burner 111 through the primary air duct 113. The oil gun 1111 ignites the pulverized coal in the first pulverized coal burner 111. The temperature of the main combustion zone 11 rises to above 600°C. All the first pulverized coal burners 111 are gradually put into operation. When the temperature of the main combustion zone 11 is above 850°C, secondary air is injected into the co-firing zone 12 through the secondary air duct 123 to provide combustion air. The biomass pellets are self-ignited after being heated by the preheating chamber 1221 and injected into the co-firing zone 12. The second pulverized coal burner 121 receives the pulverized coal from the primary air duct 113 to supplement the combustion of unburned coke. During steady-state combustion, the oxygen concentration in the main combustion zone 11 is controlled by the primary burnout air channel 112 to suppress NOx generation. The secondary burnout air channel 131 injects in two layers. The high-speed inclined airflow of the first OFA channel 1311 forces the fuel to burn out, while the horizontal airflow of the second OFA channel 1312 stabilizes the airflow.

[0040] In this process, since the biomass burner 122 and the second pulverized coal burner 121 are not directly opposed, and the biomass burners 122 are also staggered, the biomass flame path can be extended, ensuring that the gaps in the second pulverized coal burner 121 are filled, and preheating is carried out in the preheating chamber 1221 in advance, which improves the carbon conversion rate of biomass fuel and solves the problem of biomass fuel being difficult to burn completely. Furthermore, by controlling the primary burnout air channel 112 and the secondary burnout air channel 131, oxygen-deficient combustion is carried out in the main combustion zone 11, supplementary combustion is carried out in the co-combustion zone 12, and the burnout zone 13 further controls the first OFA channel 1311 and the second OFA channel 1312 to further improve the burnout rate, which can effectively reduce NOx emissions.

[0041] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A supercritical burner arrangement structure, comprising a combustion chamber (1), characterized in that: The combustion furnace (1) is divided into a main combustion zone (11), a co-combustion zone (12) and a burnout zone (13) from bottom to top. The front and rear sides of the combustion furnace (1) are the front wall (2) and the rear wall (3), respectively. The main combustion zone (11) is provided with a first pulverized coal burner (111), a primary burnout air passage (112) and a primary air duct (113). The first pulverized coal burner (111) is located between the primary burnout air passage (112) and the primary air duct (113). The primary air duct (113) is located at the bottom outside the main combustion zone (11). The co-firing zone (12) is equipped with a second pulverized coal burner (121), a biomass burner (122) and a secondary air duct (123). The second pulverized coal burner (121) and the biomass burner (122) are located above the secondary air duct (123), and the secondary air duct (123) is connected to the combustion furnace (1). The burnout zone (13) is provided with a secondary burnout air channel (131), and both the primary burnout air channel (112) and the secondary burnout air channel (131) are connected to the combustion furnace (1); The outlet of the primary air duct (113) is connected to the inlet of the first pulverized coal burner (111) and the second pulverized coal burner (121).

2. The arrangement structure of an ultra-supercritical burner according to claim 1, characterized in that: The first pulverized coal burner (111) is arranged in multiple layers in the front wall (2) and the rear wall (3). The first pulverized coal burner (111) is equipped with an oil gun (1111) and is connected to the combustion furnace (1).

3. The arrangement structure of an ultra-supercritical burner according to claim 1, characterized in that: The second pulverized coal burner (121) and the biomass burner (122) are arranged in multiple layers in the front wall (2) and the rear wall (3). The biomass burner (122) is located in the gap between the second pulverized coal burner (121), and the biomass burners (122) arranged in the front wall (2) and the rear wall (3) are staggered. The biomass burner (122) is provided with a preheating chamber (1221), and both the second pulverized coal burner (121) and the biomass burner (122) are connected to the combustion furnace (1).

4. The arrangement structure of an ultra-supercritical burner according to claim 1, characterized in that: The secondary burnout air duct (131) is disposed in the front wall (2) and the rear wall (3), and the secondary burnout air duct (131) includes a first OFA duct (1311) and a second OFA duct (1312). The first OFA channel (1311) is located above the second OFA channel (1312). The first OFA channel (1311) is inclined downward relative to one end of the combustion furnace (1), while the second OFA channel (1312) is horizontal.

5. The arrangement structure of an ultra-supercritical burner according to claim 1, characterized in that: The primary air duct (113) and the secondary air duct (123) are both located in the front wall (2) and the rear wall (3).

6. The arrangement structure of an ultra-supercritical burner according to claim 1, characterized in that: A flue gas return port (31) is provided in the rear wall (3), and the flue gas return port (31) is located between the primary air duct (113) and the first pulverized coal burner (111).

7. The arrangement structure of an ultra-supercritical burner according to claim 1, characterized in that: The secondary air duct (123) is located above the primary burnout air duct (112).

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