A burner arrangement method for improving boiler flexibility

Abstract

The present invention relates to the field of boiler combustion systems, and in particular to a burner arrangement method for improving boiler flexibility. The burner arrangement method for improving boiler flexibility of the present invention comprises: installing a burner at an adapted mounting hole on the conical surface of the cold ash hopper side wall of the boiler, and the injection direction of the burner is inclined upward. Advantages: Without modifying the original burner of the boiler system, the coal powder supply can be quickly increased, the load response rate can be improved, and a rapid increase in the boiler load can be achieved; the cold ash hopper space can be fully utilized to increase the residence time of coal powder in the furnace, increase the furnace temperature under low load, increase combustion stability, and facilitate the participation of thermal power units in deep peak regulation; the arrangement method is easy to implement, simple to arrange, and does not change the original structure of the boiler.

Description

Technical Field

[0001] The present invention relates to the field of boiler combustion systems, and in particular to a burner arrangement method for improving boiler flexibility. Background Art

[0002] With the continuous development of the economy, the problem of energy shortage is becoming more and more serious. The large-scale grid connection of wind power generation, photovoltaic power generation, etc. has alleviated the tense situation of energy supply and demand to a certain extent. However, wind power, photovoltaic power and other energy sources are largely restricted by the weather and have characteristics such as randomness, volatility and intermittency. Wind and solar power abandonment occur frequently, and the peak-shaving demand of the power grid is urgent. Thermal power has a large installed capacity in my country and is highly controllable, and is generally involved in the peak-shaving of the power grid.

[0003] The demands for rapid load adjustment and reduction, rapid start and stop during peak load regulation have placed higher demands on the flexibility of thermal power units. When the boiler is operating at low load, unstable combustion or even flameout may occur due to the low furnace temperature. In addition, due to the limitations of the existing pulverizing system and the number of burners, fuel cannot be supplied in time when the load needs to be increased, resulting in poor flexibility of existing boilers. Moreover, since different units participate in different peak load regulation times, large-scale burner and pulverizing system modifications will lead to a significant increase in costs, and the peak load regulation benefits may not cover the modification costs. Therefore, it is very necessary to design a new burner arrangement for improving boiler flexibility. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a burner arrangement method for improving the flexibility of a boiler, which effectively overcomes the defects of the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A burner arrangement method for improving boiler flexibility includes: installing a burner at an adapted mounting hole on a conical surface of a cold ash hopper side wall of the boiler, with the spray direction of the burner tilted upward.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the burners are provided in two groups and are respectively installed on the conical surfaces of the opposite side walls of the cold ash hopper.

[0009] Furthermore, each group of the above-mentioned burners has at least one.

[0010] Furthermore, each group of the above-mentioned burners is provided with two burners, which are distributed at intervals in the horizontal direction.

[0011] Furthermore, the two groups of burners are symmetrically distributed on the conical surfaces of the opposite side walls of the cold ash hopper.

[0012] Furthermore, a baffle is provided on the inner side of the tapered surface of the cold ash hopper side wall at a position corresponding to the mounting hole, and the baffle can be moved along the cold ash hopper to open or block the mounting hole.

[0013] Furthermore, the baffle can be rotatably assembled on the upper edge or lower edge of the mounting hole, and can be rotated to block the mounting hole, or rotated to one side of the mounting hole. A driving device connected to the baffle is provided on the side wall of the cold ash hopper, and the driving device is used to drive the baffle to rotate.

[0014] Furthermore, the driving device is a motor mounted on the conical surface of the cold ash hopper side wall, and the main shaft of the motor passes through the conical surface of the cold ash hopper side wall and is vertically connected and fixed to the edge of the baffle.

[0015] Furthermore, the driving device is a hand wheel, and the hand wheel is connected to a connecting rod passing through the conical surface of the side wall of the cold ash hopper, and the connecting rod is vertically connected and fixed to the edge of the baffle.

[0016] The beneficial effects of the present invention are: 1) without modifying the original burner of the boiler system, the coal powder supply can be quickly increased, the load response rate can be improved, and a rapid increase in the boiler load can be achieved; 2) the cold ash hopper space is fully utilized, the residence time of the coal powder in the furnace is increased, the furnace temperature under low load is increased, the combustion stability is increased, and it is beneficial for the thermal power unit to participate in deep peak regulation; 3) the layout method is easy to implement, the layout is simple, and the original structure of the boiler is not changed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a burner for improving boiler flexibility according to the present invention arranged on a boiler;

[0018] Figure 2 This is a schematic structural diagram of a burner for improving boiler flexibility according to the present invention, in which a rear baffle is arranged on the boiler for shielding;

[0019] Figure 3 This is a distribution structure diagram of the burners on the side wall of a single-sided cold ash hopper in the burner method for improving boiler flexibility of the present invention.

[0020] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0021] 1. Boiler; 2. Cold ash hopper; 3. Burner; 4. Baffle; 5. Drive device. DETAILED DESCRIPTION

[0022] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0023] Example

[0024] like Figure 1 As shown, the burner arrangement method for improving boiler flexibility in this embodiment includes: installing a burner 3 at a matching mounting hole on the conical surface of the side wall of the cold ash hopper 2 of the boiler 1, and the injection direction of the burner 3 is inclined upward.

[0025] In this embodiment, when the boiler 1 needs to increase its load quickly, the pulverized coal is sprayed into the furnace combustion area by the burner 3 on the conical surface of the side wall of the cold ash hopper 2 for combustion. The jet velocity at the outlet (injection port) of the burner 3 is 25m / s-30m / s, which ensures a certain jet rigidity, prolongs the residence time of the pulverized coal in the furnace, increases the furnace temperature, and promotes stable combustion of the boiler.

[0026] More specifically, this arrangement is particularly suitable for two situations: when the boiler 1 is operating at low load (the furnace temperature of the boiler 1 is low at low load, and it is easy to go out if it is not well controlled), or when the load is increased and coal cannot be delivered in time, the burner 3 sprays obliquely upward, which can effectively increase the furnace temperature and improve the stability of the boiler and the combustion process.

[0027] In this embodiment, during actual installation and use, the burner 3 has a certain swing angle relative to the cold ash hopper 2 and will swing slightly up and down according to combustion requirements, but the overall injection direction is inclined from bottom to top.

[0028] As a preferred embodiment, the burners 3 are provided in two groups and are respectively mounted on the conical surfaces of the opposite side walls of the cold ash hopper 2 , and the spraying direction of the burners 3 is the same as above.

[0029] In the above embodiment, the burners 3 are respectively installed on the conical surfaces of the opposite side walls of the cold ash hopper 2, which makes it easier for the burners 3 to spray the flow field into the boiler 1 stable, thereby increasing the temperature uniformity in the boiler 1 and achieving better results.

[0030] Generally, each group of the above-mentioned burners 3 is provided with at least one.

[0031] Best, such as Figure 3 As shown, each group of the above-mentioned burners 3 is provided with two, and are distributed at intervals in the horizontal direction.

[0032] In this embodiment, the conical surfaces of the side walls of the cold ash hopper 2 are symmetrically distributed, and the two groups of burners 3 are also symmetrically distributed on the conical surfaces of the side walls of the cold ash hopper 2 on opposite sides.

[0033] As a preferred embodiment, Figure 1 、 2 As shown, a baffle 4 is provided on the inner side of the tapered surface of the side wall of the cold ash hopper 2 at a position corresponding to the mounting hole. The baffle 4 can be moved along the cold ash hopper 2 to open or block the mounting hole.

[0034] In the above embodiment, the baffle 4 can flexibly open or block the mounting hole, which is convenient for quick opening when in use, and effectively blocks ash from falling into the burner 3 to cause corrosion and blockage when not in use. It should be noted that: when the burner 3 is not working, the baffle 4 moves to block the mounting hole, which does not affect the boiler slag discharge.

[0035] More specifically, the baffle 4 is used as follows:

[0036] like Figure 1 As shown, when the boiler 1 does not participate in deep peak regulation or does not need additional coal powder supply, the baffle 4 is in a closed state to block the installation hole (blocking the burner 3), and the burner 3 does not run. At this time, the burner at the furnace takes on the task of boiler operation.

[0037] like Figure 2 Therefore, when boiler 1 participates in deep peak regulation and needs to quickly increase the load or increase the supply of additional coal powder, the damper 4 is in the open state, the burner 3 is running, and the coal powder enters the furnace at a certain speed to burn, ensuring the combustion temperature in the furnace. The boiler can quickly respond to the load instruction and meet the requirements of wide load regulation.

[0038] As a preferred embodiment, the baffle 4 can be rotatably assembled on the upper edge or lower edge of the mounting hole, and can be rotated to block the mounting hole, or rotated to one side of the mounting hole. A driving device 5 connected to the baffle 4 is provided on the side wall of the cold ash hopper 2, and the driving device 5 is used to drive the baffle 4 to rotate.

[0039] In the above embodiment, the baffle 4 is rotatably opened or closed to open the mounting hole, and the operation is relatively simple and convenient.

[0040] More specifically, the baffle 4 can rotate in at least two ways:

[0041] 1) Electric type, specifically: the driving device 5 is a motor mounted on the conical surface of the side wall of the cold ash hopper 2 , the main shaft of the motor passes through the conical surface of the side wall of the cold ash hopper 2 , and is vertically connected and fixed to the edge of the baffle 4 .

[0042] In the above solution 1), the baffle 4 is driven to rotate by a motor to realize automatic operation, and the motor can be connected to the control system of the boiler.

[0043] 2) Mechanical type, the driving device 5 is a hand wheel, the hand wheel is connected to a connecting rod passing through the tapered surface of the side wall of the cold ash hopper 2, and the connecting rod is vertically connected and fixed to the edge of the baffle 4.

[0044] In the above solution 2), the baffle 4 is adjusted in rotation by rotating the hand wheel, and the operation is relatively simple.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0047] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0048] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0049] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0050] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A burner arrangement method for improving boiler flexibility, characterized in that: include: A burner (3) is installed at a mounting hole adapted on the conical surface of the side wall of the cold ash hopper (2) of the boiler (1), and the injection direction of the burner (3) is inclined upward; a baffle (4) is provided on the inner side of the conical surface of the side wall of the cold ash hopper (2) at a position corresponding to the mounting hole, and the baffle (4) can be moved along the cold ash hopper (2) to open or block the mounting hole; the burner (3) is provided in two groups and is respectively installed on the conical surfaces of the side walls on opposite sides of the cold ash hopper (2); when the boiler (1) does not participate in deep peak regulation or does not need to increase the supply of additional pulverized coal, the baffle (4) is in a closed state to block the mounting hole, and the burner (3) does not operate. At this time, the burner at the furnace assumes the task of boiler operation; when the boiler (1) participates in deep peak regulation and needs to quickly increase the load or needs to increase the supply of additional pulverized coal, the baffle (4) is in an open state, the burner (3) operates, and the pulverized coal enters the furnace for combustion.

2. The burner arrangement method for improving boiler flexibility according to claim 1, characterized in that: Each group of burners (3) is provided with at least one.

3. The burner arrangement method for improving boiler flexibility according to claim 2, characterized in that: Each group of burners (3) is provided with two burners, which are distributed at intervals in the horizontal direction.

4. The burner arrangement method for improving boiler flexibility according to claim 1, characterized in that: The two groups of burners (3) are symmetrically distributed on the conical surfaces of the side walls on opposite sides of the cold ash hopper (2).

5. The burner arrangement method for improving boiler flexibility according to claim 1, characterized in that: The baffle (4) can be rotatably assembled on the upper edge or lower edge of the mounting hole, and can be rotated to block the mounting hole, or rotated to one side of the mounting hole. A driving device connected to the baffle (4) is provided on the side wall of the cold ash hopper (2), and the driving device is used to drive the baffle (4) to rotate.

6. The burner arrangement method for improving boiler flexibility according to claim 5, characterized in that: The driving device (5) is a motor mounted on the conical surface of the side wall of the cold ash hopper (2). The main shaft of the motor passes through the conical surface of the side wall of the cold ash hopper (2) and is vertically connected and fixed to the edge of the baffle (4).

7. The burner arrangement method for improving boiler flexibility according to claim 5, characterized in that: The driving device (5) is a hand wheel, and the hand wheel is connected to a connecting rod passing through the conical surface of the side wall of the cold ash hopper (2), and the connecting rod is vertically connected and fixed to the edge of the baffle (4).

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