Depth peak regulation combustion centralized optimization system for tower type furnace

Abstract

The utility model relates to a deep peak regulation combustion centralized optimization system for a tower furnace, which belongs to the field of thermal power generation and comprises a furnace body, and a first pulverized coal burner, a second pulverized coal burner, a third pulverized coal burner, a fourth pulverized coal burner, a fifth pulverized coal burner and a sixth pulverized coal burner are sequentially arranged in the furnace body from bottom to top. A first pulverized coal pipeline, a second pulverized coal pipeline and a third pulverized coal pipeline are arranged outside the furnace body, the first pulverized coal pipeline is connected with a first pulverized coal burner and a second pulverized coal burner through a first adjustable concentration separation device, and the second pulverized coal pipeline is connected with a third pulverized coal burner and a fourth pulverized coal burner through a pulverized coal distributor. And the third pulverized coal pipeline is connected with a fifth pulverized coal burner and a sixth pulverized coal burner through a second adjustable concentration separation device. The utility model has the beneficial effects that the air-coal ratio can be adjusted at any time through the adjustable concentration separation device, and better oil-saving and stable-combustion effects can be realized without the aid of auxiliary combustion-supporting means such as an oil gun and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of thermal power generation, concretely to a tower furnace depth peak shaving combustion centralized optimization system. BACKGROUND

[0002] In the field of thermal power generation, in recent years, affected by the coal market, the proportion of lean coal and anthracite mixed by thermal power plants is rising, which greatly affects the combustion stability; due to the continuous increase of new energy installed capacity, the duration and frequency of deep peak shaving of coal-fired units increase.

[0003] Peak shaving refers to adjusting power generation to meet the demand during the peak period of power demand. The load of the power system changes with time and season, and during deep peak shaving of the unit, the load is low, the total coal quantity is small, and the proportion of using design coal is low, which makes the combustion unstable, and the coal fire detection and flame television are prone to flicker, so it is necessary to continuously input the oil gun to stabilize the combustion, which consumes a large amount of oil, and in severe cases, it may even cause the boiler to lose fire.

[0004] Therefore, there is an urgent need for a system that can optimize the combustion effect. UTILITY MODEL CONTENT

[0005] The technical problem to be solved by the utility model is to provide a system that can optimize the combustion effect during deep peak shaving.

[0006] The technical scheme for solving the above technical problem is as follows: a tower furnace depth peak shaving combustion centralized optimization system, comprising a furnace body, the inside of the furnace body is sequentially provided with D layer, E layer and F layer from bottom to top, the first coal powder burner and the second coal powder burner are arranged in the D layer from bottom to top, the third coal powder burner and the fourth coal powder burner are arranged in the E layer from bottom to top, and the fifth coal powder burner and the sixth coal powder burner are arranged in the F layer from bottom to top.

[0007] The first coal powder pipeline, the second coal powder pipeline and the third coal powder pipeline are arranged outside the furnace body, the first low wind coal ratio pipeline and the first high wind coal ratio pipeline are branched from the first adjustable thick and thin separation device of the first coal powder pipeline, the first high wind coal ratio pipeline is connected with the first coal powder burner, the first low wind coal ratio pipeline is connected with the second coal powder burner, the second coal powder pipeline is branched into two branch pipelines through a coal powder distributor, the two branch pipelines are connected with the third coal powder burner and the fourth coal powder burner respectively, the second low wind coal ratio pipeline is branched from the second adjustable thick and thin separation device of the third coal powder pipeline, the second low wind coal ratio pipeline is connected with the fifth coal powder burner, and the second high wind coal ratio pipeline is connected with the sixth coal powder burner.

[0008] The utility model discloses beneficial effect is: in not changing original combustor arrangement position and quantity's condition, through adjustable thick and thin separation device can adjust the wind coal ratio at any time, can not with the aid of oil gun, plasma, oxygen-enriched combustion etc.

[0009] On the basis of the above technical scheme, the utility model still can make following improvement.

[0010] Further, the first pulverized coal burner, the second pulverized coal burner, the third pulverized coal burner, the fourth pulverized coal burner, the fifth pulverized coal burner and the sixth pulverized coal burner are hinged with nozzles on one side of the furnace body, a connecting rod is vertically slidably arranged in the furnace body, one end of the connecting rod extends out of the furnace body, one end of the nozzle is hinged with one end of a swing rod, and the other end of the swing rod is hinged with a side wall of the connecting rod.

[0011] The beneficial effect of the above further scheme is that the connecting rod can swing the nozzle to realize angle adjustment and form a fuel-rich zone.

[0012] Further, an electric actuator is arranged outside the furnace body, and the electric actuator is power-connected with one end of the connecting rod extending out of the furnace body.

[0013] The beneficial effect of the above further scheme is automatic control and improved adjustment efficiency.

[0014] Further, a first oil burner is arranged in the D layer, and the first oil burner is located between the first pulverized coal burner and the second pulverized coal burner.

[0015] The beneficial effect of the above further scheme is that the first oil burner sprays fuel oil to assist combustion of the D layer.

[0016] Further, a second oil burner is arranged in the E layer, and the second oil burner is located between the third pulverized coal burner and the fourth pulverized coal burner.

[0017] The beneficial effect of the above further scheme is that the second oil burner sprays fuel oil to assist combustion of the E layer.

[0018] Further, a third oil burner is arranged in the F layer, and the third oil burner is located between the fifth pulverized coal burner and the sixth pulverized coal burner.

[0019] The beneficial effect of the above further scheme is that the third oil burner sprays fuel oil to assist combustion of the F layer.

[0020] Further, the first pulverized coal burner is provided with a D-layer bottom secondary air nozzle below, and the second pulverized coal burner is provided with a D-layer top secondary air nozzle above.

[0021] The beneficial effect of the further scheme is that the secondary air provides the required oxygen for the D-layer fuel combustion, and mixes the flue gas, controls the combustion, and optimizes the air flow, etc.

[0022] Further, the third pulverized coal burner is provided with an E-layer bottom secondary air nozzle below, and the fourth pulverized coal burner is provided with an E-layer top secondary air nozzle above.

[0023] The beneficial effect of the further scheme is that the secondary air provides the required oxygen for the E-layer fuel combustion, and mixes the flue gas, controls the combustion, and optimizes the air flow, etc.

[0024] Further, the fifth pulverized coal burner is provided with an F-layer bottom secondary air nozzle below, and the sixth pulverized coal burner is provided with an F-layer top secondary air nozzle above.

[0025] The beneficial effect of the further scheme is that the secondary air provides the required oxygen for the F-layer fuel combustion, and mixes the flue gas, controls the combustion, and optimizes the air flow, etc.

[0026] Further, the D-layer top secondary air nozzle, the E-layer top secondary air nozzle, and the F-layer top secondary air nozzle are offset air.

[0027] The beneficial effect of the further scheme is that the offset secondary air is used to wrap the pulverized coal in the center of the hearth to form a fuel-rich zone. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 It is a burner schematic diagram of the utility model.

[0029] Fig. 2 It is a nozzle schematic diagram of the utility model.

[0030] Fig. 3 It is a concentric circle combustion mode schematic diagram of the utility model.

[0031] In the drawings, the components represented by each reference numeral are listed as follows:

[0032] 1. First pulverized coal burner; 2. Second pulverized coal burner; 3. Third pulverized coal burner; 4. Fourth pulverized coal burner; 5. Fifth pulverized coal burner; 6. Sixth pulverized coal burner; 7. First pulverized coal pipeline; 8. Second pulverized coal pipeline; 9. Third pulverized coal pipeline; 10. First adjustable concentration-to-lean ratio separator; 11. First low air-to-coal ratio pipeline; 12. First high air-to-coal ratio pipeline; 13. Pulverized coal distributor; 14. Second adjustable concentration-to-lean ratio separator; 15. Second low air-to-coal ratio pipeline; 16. Second high air-coal ratio pipeline; 17. Nozzle; 18. Connecting rod; 19. Swing rod; 20. Electric actuator; 21. First oil burner; 22. Second oil burner; 23. Third oil burner; 24. Secondary air nozzle at the bottom of layer D; 25. Secondary air nozzle at the top of layer D; 26. Secondary air nozzle at the bottom of layer E; 27. Secondary air nozzle at the top of layer E; 28. Secondary air nozzle at the bottom of layer F; 29. ​​Secondary air nozzle at the top of layer F; 30. Direct airflow; 31. Offset airflow. Detailed Implementation

[0033] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0034] Example 1

[0035] like Figs. 1-2 As shown, a preferred tower furnace deep peak-shaving combustion centralized optimization system includes a furnace body. The furnace body has layers D, E and F arranged sequentially from bottom to top. Layer D has a first pulverized coal burner 1 and a second pulverized coal burner 2 arranged from bottom to top. Layer E has a third pulverized coal burner 3 and a fourth pulverized coal burner 4 arranged from bottom to top. Layer F has a fifth pulverized coal burner 5 and a sixth pulverized coal burner 6 arranged from bottom to top.

[0036] The furnace body is provided with a first pulverized coal pipe 7, a second pulverized coal pipe 8, and a third pulverized coal pipe 9. The first pulverized coal pipe 7 is divided into a first low air-coal ratio pipe 11 and a first high air-coal ratio pipe 12 by a first adjustable concentration-lean separation device 10. The first high air-coal ratio pipe 12 is connected to the first pulverized coal burner 1, and the first low air-coal ratio pipe 11 is connected to the second pulverized coal burner 2. The second pulverized coal pipe 8 is divided into two branch pipes by a pulverized coal distributor 13. The two branch pipes are respectively connected to the third pulverized coal burner 3 and the fourth pulverized coal burner 4. The third pulverized coal pipe 9 is divided into a second low air-coal ratio pipe 15 and a second high air-coal ratio pipe 16 by a second adjustable concentration-lean separation device 14. The second low air-coal ratio pipe 15 is connected to the fifth pulverized coal burner 5, and the second high air-coal ratio pipe 16 is connected to the sixth pulverized coal burner 6.

[0037] The beneficial effects of the embodiment are: without changing the original combustor arrangement position and quantity, the air-coal ratio can be adjusted at any time through the adjustable thick-thin separation device, without the aid of auxiliary combustion means such as oil gun, plasma, oxygen-enriched combustion, etc., in the case of using non-design coal, better oil saving and stable combustion effect is achieved, and the problems of poor fault resistance, large thermal deviation, high powder pipe flow rate, and general coal type adaptability in the prior art are solved.

[0038] In the embodiment, the furnace body is a 1000MW once-through tower furnace, the inner part of the furnace body is D layer, E layer and F layer and is in communication with each other, the first to sixth pulverized coal burners are arranged from bottom to top at the four corners of the furnace body, the nozzles of the burners are directed towards the center of the furnace, forming a concentric tangential circle combustion mode, and a plurality of coal mills are arranged outside the furnace body, each coal mill supplies the pulverized coal burners in the D layer, the E layer and the F layer respectively;

[0039] All the pulverized coal pipes are divided by the non-adjustable pulverized coal distributor 13 (the pulverized coal distributor is prior art, for example, the patents CN201410191971.9 and CN201610636129.0 are all recorded), and are respectively transported to two burners in each layer of the D layer, the E layer and the F layer, the pulverized coal distributor 13 can only adapt to a certain range of coal types, and the thick-thin separation is limited, the stable combustion effect is general, and auxiliary combustion means such as fuel oil and plasma is needed;

[0040] In actual production, due to the influence of the coal market, only the middle coal mill (E layer) of the running mill group (generally D, E and F mill groups) can be guaranteed to be the design coal, and the other coal mills are lean coal or even anthracite, the combustion intensity is insufficient, the anti-interference ability is poor, the air-coal ratio is about 2.2, the ignition of lean coal or even anthracite is difficult, and the fire detection flickering phenomenon easily occurs, and the oil gun needs to be used for a long time to stabilize the combustion.

[0041] In the embodiment, the pulverized coal distributors 13 of the D layer and the F layer are replaced by the first adjustable thick-thin separation device 10 and the second adjustable thick-thin separation device 14, compared with the traditional pulverized coal distributor 13, the air-coal ratio can be adjusted to adapt to the combustion adjustment from anthracite to bituminous coal;

[0042] Moreover, the second pulverized coal burner 2 and the fifth pulverized coal burner 5 can reduce the air-coal ratio to about 1.0, the second pulverized coal burner 2 and the fifth pulverized coal burner 5 burn in a fuel-rich atmosphere, and the E layer pulverized coal is wrapped inside, which can effectively assist the combustion near the E layer burner, the oil saving and stable combustion effect is good, and the low-load stable combustion without auxiliary fuel can be realized under the condition of reserving three mills at 30%THA load.

[0043] Specifically, the low air-coal ratio means more coal and less air, forming a fuel-rich area, and the combustion effect is more stable; the high air-coal ratio means less coal and more air, and fuel is saved.

[0044] Specifically, the first adjustable thick and thin separation device 10 and the second adjustable thick and thin separation device 14 are pipes connected to the pulverized coal pipe, and the pipes are internally provided with movable valve plates to separate the pipes into upper and lower passages, and the size of the upper and lower passages is adjusted by rotating the valve plates to realize the adjustment of the air-coal ratio.

[0045] As a parallel technical solution of the embodiment, the first adjustable thick and thin separation device 10 and the second adjustable thick and thin separation device 14 can also be adjustable flow dividing valves.

[0046] Embodiment 2

[0047] As shown in Figs. 1-2 Preferably, on the basis of Embodiment 1, the first pulverized coal burner 1, the second pulverized coal burner 2, the third pulverized coal burner 3, the fourth pulverized coal burner 4, the fifth pulverized coal burner 5 and the sixth pulverized coal burner 6 are respectively hinged with nozzles 17 towards one side in the furnace body, a connecting rod 18 is vertically slidably arranged in the furnace body, one end of the connecting rod 18 extends out of the furnace body, one end of each of the nozzles 17 is hinged with one end of a swing rod 19, and the other end of the swing rod 19 is hinged with a side wall of the connecting rod 18.

[0048] Preferably, an electric actuator 20 is arranged outside the furnace body, and the electric actuator 20 is in power connection with one end of the connecting rod 18 extending out of the furnace body.

[0049] In this embodiment, the electric actuator 20 controls the up and down movement of the connecting rod 18, the connecting rod 18 drives the swing rod 19 to swing, and the swing rod 19 drives the nozzle 17 to swing, so as to realize the angle adjustment of the nozzle 17 and form different combustion effects.

[0050] Specifically, the electric actuator 20 can be any device such as a motor or an electric telescopic rod.

[0051] Embodiment 3

[0052] As shown in Figs. 1-2 Preferably, on the basis of Embodiments 1-2, a first oil burner 21 is arranged in the D layer, and the first oil burner 21 is located between the first pulverized coal burner 1 and the second pulverized coal burner 2.

[0053] Preferably, a second oil burner 22 is arranged in the E layer, and the second oil burner 22 is located between the third pulverized coal burner 3 and the fourth pulverized coal burner 4.

[0054] Preferably, a third oil burner 23 is arranged in the F layer, and the third oil burner 23 is located between the fifth pulverized coal burner 5 and the sixth pulverized coal burner 6.

[0055] In this embodiment, when combustion assistance is required, fuel oil is injected into each layer through the first fuel burner 21, the second fuel burner 22 and the third fuel burner 23 to assist combustion.

[0056] Example 4

[0057] like Figs. 1-3 As shown, preferably, based on embodiments 1-3, a bottom secondary air nozzle 24 of layer D is provided below the first pulverized coal burner 1, and a top secondary air nozzle 25 of layer D is provided above the second pulverized coal burner 2.

[0058] Preferably, a bottom secondary air nozzle 26 of layer E is provided below the third pulverized coal burner 3, and a top secondary air nozzle 27 of layer E is provided above the fourth pulverized coal burner 4.

[0059] Preferably, a bottom secondary air nozzle 28 of layer F is provided below the fifth pulverized coal burner 5, and a top secondary air nozzle 29 of layer F is provided above the sixth pulverized coal burner 6.

[0060] Preferably, the secondary air nozzle 25 at the top of layer D, the secondary air nozzle 27 at the top of layer E, and the secondary air nozzle 29 at the top of layer F are biased air nozzles.

[0061] In this embodiment, all pulverized coal nozzles are connected to an airflow (called primary air) to transport pulverized coal into the furnace. Then, through the secondary air nozzles of each layer, the required oxygen is provided, and the flue gas is mixed, combustion is controlled, and airflow is optimized.

[0062] Among them, such as Fig. 3 As shown, the secondary air includes direct air 30 and offset air 31. Direct air 30 and offset air 31 are directed in different directions in the furnace, forming concentric circles of different sizes to stir up pulverized coal to prevent sedimentation and gather towards the furnace to ensure combustion effect.

[0063] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0064] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and do not connote or imply any relative importance or any meaning pertaining to the quantity of the features being described. Thus, a feature defined with "first", "second", etc. can include at least one of the features, explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

[0065] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connecting", "connection", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless specifically defined otherwise. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0066] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0067] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means 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 application. In the present application, the illustrative description of the above terms is not necessarily for 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 features of different embodiments or examples described in the present application without contradiction.

[0068] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A tower furnace depth peaking combustion centralized optimization system, characterized in that, The application relates to a coal powder combustion furnace, which comprises a furnace body, wherein D, E and F layers are sequentially arranged in the furnace body from bottom to top, first and second coal powder burners (1 and 2) are arranged in the D layer from bottom to top, third and fourth coal powder burners (3 and 4) are arranged in the E layer from bottom to top, and fifth and sixth coal powder burners (5 and 6) are arranged in the F layer from bottom to top. First, second and third coal powder pipelines (7, 8 and 9) are arranged outside the furnace body, the first coal powder pipeline (7) is divided into a first low air-coal ratio pipeline (11) and a first high air-coal ratio pipeline (12) through a first adjustable thick-thin separation device (10), the first high air-coal ratio pipeline (12) is connected with the first coal powder burner (1), the first low air-coal ratio pipeline (11) is connected with the second coal powder burner (2), the second coal powder pipeline (8) is divided into two branch pipelines through a coal powder distributor (13), the two branch pipelines are respectively connected with the third and fourth coal powder burners (3 and 4), the third coal powder pipeline (9) is divided into a second low air-coal ratio pipeline (15) and a second high air-coal ratio pipeline (16) through a second adjustable thick-thin separation device (14), the second low air-coal ratio pipeline (15) is connected with the fifth coal powder burner (5), and the second high air-coal ratio pipeline (16) is connected with the sixth coal powder burner (6).

2. The tower furnace depth peaking combustion centralized optimization system according to claim 1, characterized in that, The first, second, third, fourth, fifth and sixth coal powder burners (1, 2, 3, 4, 5 and 6) are respectively hinged with nozzles (17) on one side of the furnace body, a connecting rod (18) is vertically arranged in the furnace body and extends out of the furnace body, one end of each of the nozzles (17) is hinged with one end of a swing rod (19), and the other end of the swing rod (19) is hinged with a side wall of the connecting rod (18).

3. The tower furnace depth peaking combustion centralized optimization system according to claim 2, characterized in that, An electric actuator (20) is arranged outside the furnace body and is connected with one end of the connecting rod (18) extending out of the furnace body.

4. The tower furnace depth peaking combustion centralized optimization system according to claim 1, characterized in that, A first oil burner (21) is arranged in the D layer and located between the first and second coal powder burners (1 and 2).

5. The tower furnace depth peaking combustion concentration optimization system according to claim 4, characterized in that, A second oil burner (22) is arranged in the E layer and located between the third and fourth coal powder burners (3 and 4).

6. The tower furnace depth peaking combustion concentration optimization system according to claim 5, characterized in that, A third oil burner (23) is arranged in the F layer and located between the fifth and sixth coal powder burners (5 and 6).

7. The tower furnace depth peaking combustion concentration optimization system of claim 1, wherein, A D-layer bottom secondary air nozzle (24) is arranged below the first coal powder burner (1), and a D-layer top secondary air nozzle (25) is arranged above the second coal powder burner (2).

8. The tower furnace depth peaking combustion concentration optimization system of claim 7, wherein, An E-layer bottom secondary air nozzle (26) is arranged below the third coal powder burner (3), and an E-layer top secondary air nozzle (27) is arranged above the fourth coal powder burner (4).

9. The tower furnace depth peaking combustion concentration optimization system of claim 8, wherein, The fifth pulverized coal burner (5) is provided with a F layer bottom secondary air nozzle (28) below, and the sixth pulverized coal burner (6) is provided with a F layer top secondary air nozzle (29) above.

10. The tower furnace depth peaking combustion concentration optimization system of claim 9, wherein, The D layer top secondary air nozzle (25), the E layer top secondary air nozzle (27) and the F layer top secondary air nozzle (29) are bias air.

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