Stable combustion type tangential pulverized coal burner

Abstract

The utility model provides a stable combustion type tangential pulverized coal burner, which comprises four groups of main burners, the main burners are arranged on a hearth, and each main burner comprises a thick pulverized coal primary air nozzle, a thin pulverized coal primary air nozzle, a conventional primary air nozzle and a secondary air nozzle, primary air nozzles of each layer of the main burner are a conventional primary air nozzle, a thick powder primary air nozzle, a conventional primary air nozzle, a thick powder primary air nozzle, a conventional primary air nozzle, a thin powder primary air nozzle, a thin powder primary air nozzle and a conventional primary air nozzle in sequence from bottom to top; the pulverized coal burner has the advantages that under the condition that a boiler needs to achieve safe ignition starting through a low-position mill, the conflict between the arrangement of the plasma or tiny-oil ignition pulverized coal burner and the thick pulverized coal primary air nozzle and the thin pulverized coal primary air nozzle is reasonably solved, and the stable combustion effect of the thick pulverized coal primary air nozzle is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coal powder combustion, especially to a stable combustion type tangential coal powder burner. BACKGROUND

[0002] The non-fuel-supporting stable combustion load is an important performance index for testing the coal powder boiler, and is mainly realized by taking certain stable combustion measures on the coal powder burner. The conventional coal powder boiler generally has no low requirement for the non-fuel-supporting stable combustion load. In recent years, in order to solve the problem of insufficient consumption of new energy such as wind and light, help the transformation of energy structure, and promote the sustainable and healthy development of new energy, the coal powder boiler is required to have deep peak regulation, and the non-fuel-supporting stable combustion load of the boiler is continuously reduced.

[0003] The conventional coal powder burner stable combustion technology cannot meet the requirement of stable combustion of the boiler at an ultra-low load. The thick and thin separation of the primary air flow is carried out, the thick primary air and the thin primary air are sent into the boiler through independent pipes and nozzles respectively, which is the current mainstream ultra-low load stable combustion technology. When the boiler is operated at an ultra-low load, the stable combustion is generally realized by mutual support of the 1st layer of conventional primary air nozzles and the 1st layer of adjacent thick primary air nozzles, and the ignition supporting measure must be put into operation at any time. SUMMARY

[0004] In order to overcome the above problems in the prior art, the utility model provides a stable combustion type tangential coal powder burner.

[0005] The utility model discloses a stable combustion type tangential coal powder burner, including four groups of main burner, main burner is arranged on hearth, the main burner includes thick primary air nozzle, thin primary air nozzle, conventional primary air nozzle and secondary air nozzle, each layer primary air nozzle of main burner is in turn conventional primary air nozzle, thick primary air nozzle, conventional primary air nozzle, thick primary air nozzle, conventional primary air nozzle, thin primary air nozzle, thin primary air nozzle, conventional primary air nozzle from below to top.

[0006] On this basis, the secondary air nozzle is arranged at intervals between the thick primary air nozzle, the thin primary air nozzle and the conventional primary air nozzle and at the upper and lower ends.

[0007] On this basis, the thick primary air nozzle and the thin primary air nozzle are arranged at intervals.

[0008] On this basis, the uppermost layer of the primary air nozzle of the main burner is a conventional primary air nozzle.

[0009] On this basis, the two layers of thin primary air nozzles are arranged adjacent to each other and above the thick primary air nozzles.

[0010] On this basis, the axes of the concentrated powder primary air nozzle, the dilute powder primary air nozzle, the conventional primary air nozzle and the secondary air nozzle on the same horizontal plane cut a notional tangent circle with the hearth center as the center, forming a rotating air flow field in the hearth.

[0011] On this basis, the plasma or micro-oil ignition device is arranged in the conventional primary air nozzle of the third layer from bottom to top.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] (1) under the condition that the boiler must be started by the low-position mill to realize safe ignition, the conflict between the plasma or micro-oil ignition pulverized coal burner arrangement and the concentrated powder primary air nozzle and the dilute powder primary air nozzle is reasonably solved, the stable combustion effect of the concentrated powder primary air nozzle is ensured, the ignition difficulty problem of the dilute powder air flow is avoided, and the ignition and stable combustion effect of the concentrated powder air flow are avoided;

[0014] (2) when the boiler is in stable combustion operation under the ultra-low load, the combination mode of the layer conventional primary air nozzle and the layer adjacent concentrated powder primary air nozzle has the following three kinds from bottom to top: the first layer conventional primary air nozzle + the second layer concentrated powder primary air nozzle, the third layer conventional primary air nozzle + the second layer concentrated powder primary air nozzle, and the third layer conventional primary air nozzle + the fourth layer concentrated powder primary air nozzle, and the operation collocation flexibility is good.

[0015] (3) the upper part of the two layers of dilute powder primary air nozzles is arranged with one layer of conventional primary air nozzles, which promotes the ignition and burnout of the dilute powder. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a stable combustion type tangential pulverized coal burner arrangement schematic diagram in example one;

[0017] Figure 2 It is an A-A sectional view in example one;

[0018] Figure 3 It is a stable combustion type tangential pulverized coal burner arrangement schematic diagram in example two;

[0019] Figure 4 It is a B-B sectional view in example two;

[0020] In the figure: - hearth; 2 - burner; 3 - concentrated powder primary air nozzle; 4 - dilute powder primary air nozzle; 5 - conventional primary air nozzle; 6 - secondary air nozzle. DETAILED DESCRIPTION

[0021] The utility model will be further explained in detail in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and are not used to limit the utility model.

[0022] Embodiment One

[0023] With reference to the drawings and Figure 2 The utility model discloses a stable combustion type tangential coal dust burner, including four groups main burner 2, main burner 2 is arranged in the four corners of hearth 1, main burner 2 includes thick powder primary air nozzle 3, light powder primary air nozzle 4, conventional primary air nozzle 5 and secondary air nozzle 6, the primary air nozzle of each layer of main burner 2 is in turn conventional primary air nozzle 5, thick powder primary air nozzle 3, conventional primary air nozzle 5, thick powder primary air nozzle 3, conventional primary air nozzle 5, light powder primary air nozzle 4, light powder primary air nozzle 4, conventional primary air nozzle 5 from below to top.

[0024] The arrangement mode is mainly derived as follows: firstly, the plasma / micro-oil burner must be arranged in the conventional primary air nozzle 5 in the 4th layer of primary air nozzle below the main burner 2 to ensure low-position mill start-up, and in the embodiment, it is arranged in the 1st layer and the 3rd layer from below to top, and the conventional layer; since the plasma / micro-oil burner cannot be arranged in the thick powder and light powder layers, the stable combustion effect of the thick powder airflow is affected, and the light powder airflow cannot be normally ignited, therefore, the thick powder primary air nozzle 3 is arranged in the 2nd layer and the 4th layer from below to top, avoiding the plasma / micro-oil burner; the light powder airflow affects the ignition and stable combustion effect of the thick powder airflow, and the thick powder primary air nozzle 3 and the light powder primary air nozzle 4 cannot be arranged adjacent to each other, therefore, the thick powder primary air nozzle 3 is arranged in the 2nd layer and the 4th layer from below to top, and the light powder primary air nozzle 4 is arranged in the 6th layer and the 7th layer; when the layer conventional primary air nozzle 5 and the thick powder primary air nozzle 5 adjacent to each other support the stable combustion, there are three combination modes, i.e., the 1st layer conventional primary air nozzle 5 + the 2nd layer thick powder primary air nozzle 3, the 3rd layer conventional primary air nozzle 5 + the 2nd layer thick powder primary air nozzle 3, and the 3rd layer conventional primary air nozzle 5 + the 4th layer thick powder primary air nozzle 3, and the combination mode is flexible; the 2nd layer light powder primary air nozzle 4 arranged in the uppermost part of the main burner will affect the burnout, and is arranged in the 6th layer and the 7th layer, and the uppermost layer is the conventional primary air nozzle 5.

[0025] The axes of the thick powder primary air nozzle 3, the light powder primary air nozzle 4, the conventional primary air nozzle 5 and the secondary air nozzle 6 on the same horizontal plane are tangent to an imaginary tangent circle with the hearth center as the center, and a rotating airflow field is formed in the hearth.

[0026] In order to adapt to different coal qualities, the boiler can be provided with more coal mills, and in the embodiment, the number of conventional primary air nozzles can be increased accordingly, and the increased conventional primary air nozzles are arranged between the 5th layer conventional primary air nozzle and the 6th layer light powder primary air nozzle from below to top.

[0027] Embodiment Two

[0028] With reference to the drawings and Figure 3 And Figure 4The difference from the embodiment one is that four groups of main burners 2 are arranged on the four walls of the furnace 1.

[0029] The embodiment one and the embodiment two respectively correspond to two common tangential combustion technologies, the embodiment one corresponds to the tangential combustion technology of four corners, and the embodiment two corresponds to the tangential combustion technology of walls, the elevational arrangements of the two technologies are similar, and the main difference is that the section arrangements A-A are different.

[0030] In the description of the present application, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "central", "both ends" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", "threading", "pad setting" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited, the above-mentioned terms in the present application can be understood according to the specific meaning of the above-mentioned terms in the present application according to the specific circumstances.

[0032] The above description shows and describes the preferred embodiments of the present application, as described above, it should be understood that the present application is not limited to the forms disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the application conceived in the present application by the above-mentioned teaching or related technology or knowledge. The modification and change made by the person skilled in the art without departing from the spirit and scope of the present application should be within the protection scope of the claims attached to the present application.

Claims

1. A stable combustion type tangential pulverized coal burner, characterized by: The main burner (2) comprises four groups of primary air nozzles (3), (4), (5) and secondary air nozzles (6) arranged on the furnace (1), wherein the primary air nozzles (3), (4), (5) are arranged in the order of conventional primary air nozzles (5), dense-pulverized coal primary air nozzles (3), conventional primary air nozzles (5), dense-pulverized coal primary air nozzles (3), conventional primary air nozzles (5), light-pulverized coal primary air nozzles (4), light-pulverized coal primary air nozzles (4) and conventional primary air nozzles (5) from bottom to top.

2. The stable combustion type tangential pulverized coal burner according to claim 1, characterized by: The secondary air nozzles (6) are arranged between the primary air nozzles (3), (4), (5) and at the upper and lower ends.

3. The stable combustion type tangential pulverized coal burner according to claim 1, characterized by: The dense-pulverized coal primary air nozzles (3) and the light-pulverized coal primary air nozzles (4) are arranged alternately.

4. The stable combustion type tangential pulverized coal burner according to claim 1, characterized by: The uppermost primary air nozzles of the main burner (2) are conventional primary air nozzles (5).

5. The stable combustion type tangential pulverized coal burner according to claim 1, characterized by: Two groups of light-pulverized coal primary air nozzles (4) are arranged adjacently and above the dense-pulverized coal primary air nozzles (3).

6. The stable combustion type tangential pulverized coal burner according to claim 1, characterized by: The axes of the dense-pulverized coal primary air nozzles (3), the light-pulverized coal primary air nozzles (4), the conventional primary air nozzles (5) and the secondary air nozzles (6) in the same horizontal plane are tangent to a hypothetical tangent circle with the center of the furnace as the center, forming a rotating air flow field in the furnace.

7. The stable combustion type tangential pulverized coal burner according to claim 1, characterized by: Plasma or micro-oil ignition devices are arranged in the first and third layers of conventional primary air nozzles (5) from bottom to top.

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