A combustion device with adjustable rich-lean separation ratio and wide coal type adaptability

Abstract

The present invention discloses a combustion device with adjustable rich-lean separation ratio and wide coal type adaptability, which includes a primary air duct, a primary air and powder separation plate, a support rod of the primary air and powder separation plate, and a rich-lean separation baffle and a support connection device arranged in the primary air duct; the primary air and powder separation plate is hingedly connected to the primary air duct, a slide rail connected to the support connection device is opened on the lower end surface of the primary air and powder separation plate, so as to realize that when the support connection device moves up and down, the angle between the primary air and powder separation plate and the primary air duct changes accordingly, one end of the support rod of the primary air and powder separation plate is connected to the support connection device, and the other end extends outside the primary air duct; a rich-lean separation baffle is installed in the primary air duct behind the primary air and powder separation plate to divide the air-powder mixture after passing through the primary air and powder separation plate into a rich-phase primary air and powder pipe and a lean-phase primary air and powder pipe. For different coal types and different burner loads, this combustion device can achieve a targeted and optimized coal powder rich-lean separation ratio at the burner outlet.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental protection in power plants, and particularly relates to a combustion device with adjustable concentration-dilution separation ratio and wide coal type adaptability. Background Art

[0002] At the present stage, affected by the form of coal market supply and the changes in the power market, large-scale thermal power units currently in operation all have the need to adapt to variable loads and variable coal types. At the present stage, in order to achieve peak shaving performance, coal-fired power plants need to have the ability to operate at low loads, and at the same time ensure that the generation of pollutants during the combustion process is at a relatively low level. Usually, the pulverized coal concentration-dilution combustion technology is adopted.

[0003] Due to the large variety and significant adjustments in the energy supply situation, the coal types applicable to the original design of the burner are different from those obtained through market procurement, and the burner needs to be correspondingly modified. For a burner after a certain modification, it also faces problems such as the deterioration of the combustion organization in the furnace leading to unstable combustion and high pollutants after combustion due to coal type changes.

[0004] However, for the specific concentration-dilution separation ratio, it needs to be optimized specifically for different coal types. For the transformation of traditional burners, the concentration-dilution separation device after transformation has a fixed concentration-dilution separation ratio. With the changes in the coal market, the concentration-dilution separation device after transformation cannot be adjusted to adapt to new coal types, thus achieving optimized combustion stability and pollutant control. Summary of the Invention

[0005] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a combustion device with adjustable concentration-dilution separation ratio and wide coal type adaptability. This burner can adapt to different primary air velocities and simultaneously achieve an adjustable concentration-dilution separation ratio, aiming at the combustion conditions of different coal types and different loads. The combustion device can operate at the original designed primary air-powder air equivalence ratio and primary air concentration-dilution separation ratio, ensuring the optimized organization of combustion in the burner area of the furnace and realizing the safe, stable and low-pollution operation of the burner under different coal types and variable load conditions.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A combustion device with adjustable concentration-dilution separation ratio and wide coal type adaptability includes a primary air duct, a primary air-powder separation plate, a primary air-powder separation plate support rod, and a concentration-dilution baffle and a support connection device arranged in the primary air duct;

[0008] The primary air powder separation plate is connected to the primary air duct through a hinge. A slide rail connected to the support connection device is provided on the lower end face of the primary air powder separation plate, enabling the angle between the primary air powder separation plate and the primary air duct to change as the support connection device moves up and down. One end of the support rod of the primary air powder separation plate is connected to the support connection device, and the other end extends outside the primary air duct;

[0009] A concentration-dilution separation baffle is installed in the primary air duct behind the primary air powder separation plate, dividing the air-powder mixture passing through the primary air powder separation plate into a concentrated-phase primary air powder pipe and a diluted-phase primary air powder pipe.

[0010] A further improvement of the present invention lies in that the angle between the primary air powder separation plate and the primary air duct can be adjusted.

[0011] A further improvement of the present invention lies in that there are several openings on the primary air powder separation plate, forming fish-scale fins.

[0012] A further improvement of the present invention lies in that the fish-scale fins form a 30-degree angle with the primary air powder separation plate.

[0013] A further improvement of the present invention lies in that the height of the support rod of the primary air powder separation plate extending into the primary air duct can be adjusted at any time to meet the requirements of different coal types and different loads.

[0014] A further improvement of the present invention lies in that the concentration-dilution separation baffle is integrally arranged at the center line of the inlet primary air duct.

[0015] A further improvement of the present invention lies in that the concentrated-phase primary air powder pipe is above the concentration-dilution separation baffle, and the diluted-phase primary air powder pipe is below it.

[0016] A further improvement of the present invention lies in that the concentration-dilution separation baffle is provided with an upward-bending inclination angle.

[0017] A further improvement of the present invention lies in that the separation end of the concentration-dilution separation baffle is bent towards the concentrated-phase primary air powder pipe.

[0018] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0019] When the wide coal type adaptable adjustable concentration-dilution separation ratio combustion device of the present invention is in specific operation, different pulverized coal concentration-dilution separation effects can be achieved by adjusting the height of the support rod of the primary air-pulverized coal separation plate extending into the primary air duct. When the coal type or boiler load changes, there will be differences in the preferred concentration-dilution separation ratios corresponding to the given coal type or load conditions. Therefore, by adjusting the angle between the primary air-pulverized coal separation plate and the primary air duct, it can be ensured that under variable coal type or variable load conditions, the concentration-dilution separation ratio of the pulverized coal at the burner outlet will not deviate too far from the preferred concentration-dilution separation ratio corresponding to a specific working condition. Therefore, this combustion device can ensure the concentration-dilution separation effect of the primary air-pulverized coal under wide coal types and different burner load conditions, obtain the preferred concentration-dilution separation ratio of the pulverized coal at the burner outlet for a specific coal type and burner load, ensure that the air organization in the furnace during combustion at different loads is similar to the design working condition, provide guarantee for the ignition of the pulverized coal air flow and low NOx combustion, and achieve stable, safe, efficient and environmentally friendly combustion under wide loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Description of the reference numerals:

[0022] 1 - primary air duct; 2 - primary air-pulverized coal separation plate; 3 - concentration-dilution separation baffle; 4 - concentrated-phase primary air-pulverized coal pipe; 5 - support connection device; 6 - support rod of the primary air-pulverized coal separation plate; 7 - diluted-phase primary air-pulverized coal pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present invention disclosure. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Schematic diagrams of various structures according to the disclosed embodiments of the present invention are shown in the drawings. These figures are not drawn to scale, where some details are enlarged for the purpose of clear expression, and some details may be omitted. The shapes of various regions and layers shown in the figures and their relative sizes and positional relationships are only exemplary, and may actually deviate due to manufacturing tolerances or technical limitations, and those skilled in the art can design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0025] In the context of the present invention, when a layer / component is referred to as being "on" another layer / component, the layer / component can be directly on the other layer / component, or there can be an intermediate layer / component between them. Additionally, if a layer / component is "on" another layer / component in one orientation, then when the orientation is reversed, the layer / component can be "under" the other layer / component.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and in the above-mentioned drawings are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0027] The present invention will be further described in detail below with reference to the accompanying drawings:

[0028] See Figure 1 , a combustion device with adjustable concentration-dilution separation ratio and wide coal type adaptability provided by the present invention includes a primary air duct 1, a primary air and powder separation plate 2, a concentration-dilution separation baffle 3, a concentrated-phase primary air and powder pipe 4, a diluted-phase primary air and powder pipe 7, a support rod 6 for the primary air and powder separation plate, and a support connection device 5. The concentration-dilution separation baffle 3, the support rod 6 for the primary air and powder separation plate, and the support connection device 5 are all installed in the primary air duct 1.

[0029] The primary air and powder separation plate 2 is hinged to the primary air duct, and its angle can be adjusted.

[0030] A slide rail connected to the support connection device 5 is opened on the lower end surface of the primary air and powder separation plate 2, so that when the support connection device 5 moves up and down, the angle between the primary air and powder separation plate 2 and the primary air duct changes accordingly.

[0031] A number of openings are opened on the primary air and powder separation plate 2 to form fish-scale fins, and the fins form a 30-degree angle with the primary air and powder separation plate 2.

[0032] A concentration-dilution separation baffle 3 is installed in the primary air duct 1 behind the primary air and powder separation plate 2 to divide the air and powder mixture after passing through the primary air and powder separation plate 2 into a concentrated-phase primary air and powder pipe 4 and a diluted-phase primary air and powder pipe 7.

[0033] The height of the primary air and pulverized coal separation plate support rod 6 extending into the primary air duct can be adjusted at any time to meet the requirements of different coal types and different loads.

[0034] Principle and working process of the present invention:

[0035] For the wide coal type adaptable pulverized coal concentration and dilution ratio adjustable combustion device described in the present invention, during specific operation, by adjusting the height of the primary air and pulverized coal separation plate support 6 extending into the primary air duct 1, different pulverized coal concentration and dilution separation effects can be achieved. When the coal type or boiler load changes, there will be differences in the preferred concentration and dilution separation ratios corresponding to the established coal type or load conditions. Therefore, by adjusting the angle between the primary air and pulverized coal separation plate 2 and the primary air duct 1, the pulverized coal concentration and dilution separation ratio at the burner outlet under variable coal type or variable load conditions will not deviate too far from the preferred pulverized coal concentration and dilution separation ratio corresponding to a specific working condition. During the actual operation process, the coal type often changes. If the actual coal type becomes a low volatile and difficult-to-combust coal type compared with the designed coal type, the height of the primary air and pulverized coal separation plate support rod 6 extending into the primary air duct increases, the angle between the primary air and pulverized coal separation plate 2 and the primary air duct 1 increases, strengthening the pulverized coal concentration and dilution separation effect at the burner outlet, further increasing the concentration of the concentrated-phase pulverized coal, promoting the volatile matter concentration of the concentrated-phase pulverized coal, which can promote the timely ignition of the primary air and pulverized coal mixture at the burner outlet and reduce the impact of the low volatile and difficult-to-combust coal type entering the furnace on the original designed combustion. If the actual coal type becomes a high volatile and easy-to-combust coal type compared with the designed coal type, the height of the primary air and pulverized coal separation plate support rod 6 extending into the primary air duct 1 decreases, the angle between the primary air and pulverized coal separation plate 2 and the primary air duct 1 decreases, relatively weakening the pulverized coal concentration and dilution separation effect at the burner outlet, and avoiding the premature ignition of the primary air and pulverized coal mixture at the burner outlet and burning out the burner.

[0036] In summary, for different coal types and different burner loads, this combustion device can ensure the concentration and dilution separation effect of primary air and pulverized coal under wide coal type and different burner load conditions, obtain the preferred pulverized coal concentration and dilution separation ratio at the burner outlet for a specific coal type and burner load, ensure that under the condition that the actual coal type deviates from the original designed coal type of the burner, the concentration and dilution separation ratio at the burner outlet and the concentration and dilution separation effect of primary air and pulverized coal under a wide load range for different coal types are ensured, ensure that the air organization in the furnace during combustion at different loads is similar to the designed working condition, provide guarantee for the ignition of pulverized coal air flow and low NOx combustion, and achieve stable, safe, efficient and environmentally friendly combustion under wide loads.

Claims

1. A combustion device with adjustable concentration-dilution separation ratio and wide coal type adaptability, characterized in that, It includes a primary air duct (1), a primary air and pulverized coal separation plate (2), a support rod for the primary air and pulverized coal separation plate (6), a concentration-dilution separation baffle (3) and a support connection device (5) arranged in the primary air duct (1); The primary air and pulverized coal separation plate (2) is hinged to the primary air duct (1). A slide rail connected to the support connection device (5) is provided on the lower end surface of the primary air and pulverized coal separation plate (2), so that when the support connection device (5) moves up and down, the angle between the primary air and pulverized coal separation plate (2) and the primary air duct changes accordingly. One end of the support rod for the primary air and pulverized coal separation plate (6) is connected to the support connection device (5), and the other end extends outside the primary air duct (1); the height of the support rod for the primary air and pulverized coal separation plate (6) extending into the primary air duct (1) can be adjusted at any time to meet the requirements of different coal types and different loads; A concentration-dilution separation baffle (3) is installed in the primary air duct (1) behind the primary air and pulverized coal separation plate (2) to divide the air-pulverized coal mixture after passing through the primary air and pulverized coal separation plate (2) into a concentrated-phase primary air and pulverized coal pipe (4) and a diluted-phase primary air and pulverized coal pipe (7).

2. The adjustable combustion device with rich-lean separation ratio and wide coal type adaptability according to claim 1, characterized in that, The included angle between the primary air and pulverized coal separation plate (2) and the primary air duct (1) can be adjusted.

3. The adjustable combustion device with rich-lean separation ratio and wide coal type adaptability according to claim 1, characterized in that, There are several openings on the primary air and pulverized coal separation plate (2) to form fish-scale fins.

4. A wide coal type adaptable adjustable concentration-dilution separation ratio combustion device according to claim 3, characterized in that, The fish-scale fins form a 30-degree angle with the primary air and pulverized coal separation plate (2).

5. A kind of adjustable combustion device with rich-lean separation ratio and wide coal type adaptability according to claim 1, characterized in that The concentration-dilution separation baffle (3) is integrally arranged at the center line of the inlet primary air duct (1).

6. The adjustable combustion device with rich-lean separation ratio for wide coal type adaptability according to claim 5, characterized in that Above the concentration-dilution separation baffle (3) is the concentrated-phase primary air and pulverized coal pipe (4), and below is the diluted-phase primary air and pulverized coal pipe (7).

7. The adjustable combustion device with rich-lean separation ratio for wide coal type adaptability according to claim 6, characterized in that The concentration-dilution separation baffle (3) is provided with an upward-bending inclination angle.

8. A kind of adjustable combustion device with rich-lean separation ratio for wide coal type adaptability according to claim 7, characterized in that, The separation end of the concentration-dilution separation baffle (3) is bent towards the concentrated-phase primary air and pulverized coal pipe (4).

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