Boiler flexibility deep peak regulation optimization device

Abstract

The utility model belongs to the technical field of boilers, and particularly relates to a boiler flexibility depth peak regulation optimizing device which comprises a pulverized coal boiler hearth, a pulverized coal pipeline is arranged at the front end of the pulverized coal boiler hearth, and the pulverized coal boiler hearth is sequentially provided with a combustion-supporting assembly, an upper-layer combustor and a lower-layer combustor from top to bottom. The upper-layer combustor and the lower-layer combustor are both thick-thin separation combustors; a secondary air nozzle is arranged between the upper-layer combustor and the lower-layer combustor; and a soot blower is arranged at the tail end of a hearth of the pulverized coal fired boiler. Original E and F layer combustors are optimally designed, the technical concept of'internal rich-lean separation combustion + thick side approaching 'is adopted, and E and F layers adopt a built-in up-down rich-lean separation device technology, so that pulverized coal airflow with the pulverized coal distribution ratio of 7: 3 is uniformly divided into upper and lower rich-lean airflow, the ignition capacity of the pulverized coal on the thick side is remarkably improved, the low-load combustion stability is ensured, and the combustion efficiency is improved. And combustion stability under the low load of 25% ECR is achieved, and the deep peak regulation problem is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of boilers, and in particular relates to a boiler flexibility deep peak regulation optimization device. Background Art

[0002] The National Energy Administration issued a notice on the first and second batches of pilot projects for thermal power flexibility transformation and pointed out: "Strengthen the construction of power emergency peak-shaving capacity, study policy measures and market mechanisms to promote thermal power flexibility transformation, and accelerate the promotion of flexibility transformation of 300,000 kilowatt-level and some 600,000 kilowatt-level coal-fired units." Therefore, in order to adapt to the rapid development of renewable energy, improve the power system's ability to absorb renewable energy, and ensure the safe and stable operation of the power system, it is imperative to carry out flexibility transformation of coal-fired units;

[0003] In the daily operation of supercritical boilers, with the increasing proportion of new energy, boiler peak regulation is becoming more frequent, but the minimum stable combustion load of the boiler must be above 35%, which cannot meet the market demand for deep peak regulation.

[0004] In order to solve the above problems, this application proposes a boiler flexibility deep peak regulation optimization device. Utility Model Content

[0005] In order to solve the problems raised in the above background technology, the utility model provides a boiler flexibility deep peak regulation optimization device, which has the characteristics of being able to achieve stable combustion under 25% ECR low load.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a boiler flexibility deep peak-shaving optimization device, comprising a pulverized coal boiler furnace, a pulverized coal pipeline is provided at the front end of the pulverized coal boiler furnace, and the pulverized coal boiler furnace is provided with a combustion-supporting component, an upper burner and a lower burner from top to bottom, and the upper burner and the lower burner are both thick and thin separation burners; a secondary air nozzle is provided between the upper burner and the lower burner, and a soot blower is provided at the end of the pulverized coal boiler furnace.

[0007] As a preferred boiler flexibility deep peak-shaving optimization device of the utility model, the combustion-supporting component includes a primary air nozzle and a burner group, and a micro-oil igniter is provided on the burner group.

[0008] As a preferred boiler flexibility deep peak-shaving optimization device of the utility model, the micro-oil igniter is arranged at one end of the pulverized coal boiler furnace close to the upper burner.

[0009] As a preferred boiler flexibility deep peak-shaving optimization device of the utility model, the upper burner is a lower-concentrated and upper-light pulverized coal burner, and the lower burner is an upper-concentrated and lower-light pulverized coal burner.

[0010] As a preferred boiler flexibility deep peak-shaving optimization device of the utility model, the upper burners and the lower burners are both in eight groups, and the airflow pulverized coal distribution ratio of the upper burners and the lower burners is 7:3.

[0011] As a preferred boiler flexibility deep peak-shaving optimization device of the utility model, the soot blower includes a jet disk arranged at the end of the furnace of the pulverized coal boiler, the jet disk array is provided with jet holes, and the number of the jet holes is eight groups.

[0012] Compared with the prior art, the beneficial effects of the utility model are: by optimizing the design of the original E and F layer burners and adopting the technical concept of "internal thick and thin separation combustion + similar thick side", the E and F layers adopt built-in upper and lower thick and thin separation device technology, and the coal powder airflow with a coal powder distribution ratio of 7:3 is evenly divided into upper and lower thick and thin airflows, which significantly improves the ignition ability of the thick side coal powder, ensures the low-load combustion stability, achieves stable combustion under 25% ECR low load, and solves the deep peak regulation problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0014] Figure 1 It is an axonometric drawing of the utility model;

[0015] Figure 2 It is a schematic diagram of the structure of the utility model;

[0016] Figure 3 It is a schematic diagram of the structure of the upper burner in the utility model;

[0017] Figure 4 It is a structural schematic diagram of the middle and lower burners of the utility model;

[0018] Figure 5 It is a structural schematic diagram of the secondary air nozzle in the utility model;

[0019] Figure 6 It is a structural schematic diagram of the soot blower in the utility model.

[0020] In the figure: 1. Pulverized coal boiler furnace; 2. Combustion-supporting assembly; 21. Primary air nozzle; 22. Burner group; 23. Micro-oil igniter; 3. Upper burner; 4. Lower burner; 5. Secondary air nozzle; 6. Soot blower; 61. Jet disk; 62. Jet hole; 7. Pulverized coal pipeline. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Example 1

[0023] like Figure 1 , Figure 2 and Figure 5 As shown;

[0024] A boiler flexibility deep peak-shaving optimization device comprises a pulverized coal boiler furnace 1, a pulverized coal boiler furnace 1 having a pulverized coal pipeline 7 at the front end thereof, the pulverized coal boiler furnace 1 being provided with a combustion-supporting component 2, an upper burner 3 and a lower burner 4 in sequence from top to bottom, the upper burner 3 and the lower burner 4 being both thick-thin separation burners; a secondary air nozzle 5 is provided between the upper burner 3 and the lower burner 4, and a soot blower 6 is provided at the end of the pulverized coal boiler furnace 1.

[0025] In this implementation scheme: by optimizing the design of the original E and F layer burners and adopting the technical concept of "internal thick and thin separation combustion + similar thick side", the E and F layers use built-in upper and lower thick and thin separation device technology to evenly divide the coal powder airflow with a coal powder distribution ratio of 7:3 into upper and lower thick and thin airflows, significantly improving the ignition ability of the coal powder on the thick side, ensuring low-load combustion stability, achieving stable combustion under 25% ECR low load, and solving the deep peak regulation problem.

[0026] In an optional embodiment, the combustion-supporting assembly 2 includes a primary air nozzle 21 and a burner group 22 , on which a micro-oil igniter 23 is provided. The micro-oil igniter 23 is arranged at one end of the pulverized coal boiler furnace 1 close to the upper burner 3 .

[0027] In this embodiment: the D-layer burner is added with a layer of micro-oil ignition facilities to improve the flame support capacity of the adjacent layers and ensure low-load combustion stability.

[0028] like Figure 3 and Figure 4 As shown;

[0029] In an optional embodiment, the upper burner 3 is a lower-concentrated and upper-light coal powder burner, and the lower burner 4 is an upper-concentrated and lower-light coal powder burner. The upper burners 3 and the lower burners 4 are eight groups each, and the airflow coal powder distribution ratio of the upper burners 3 and the lower burners 4 is 7:3.

[0030] In this embodiment: the thick-thin separation burner is a new type of combustion equipment, which can effectively separate fuel and air and realize efficient utilization of combustion materials during the combustion process. It is an environmentally friendly and energy-saving professional equipment in the industry, and can play an important role in reducing energy consumption and reducing environmental pollution.

[0031] like Figure 6 As shown;

[0032] In an optional embodiment, the soot blower 6 includes a jet disk 61 disposed at the end of the pulverized coal boiler furnace 1 , and the jet disk 61 is provided with an array of jet holes 62 , and the number of the jet holes 62 is eight groups.

[0033] In this embodiment: a laminated disc jet soot blower technology is designed and developed, using 8 Laval jet soot blowing flat holes, spraying soot blowing jets with compressed air in eight directions, arranged in an array, and using compressed air to perform jet disturbance on the accumulated ash, forcing the accumulated ash to be re-entrained by the flue gas into the subsequent flue, thereby achieving the purpose of removing the accumulated ash.

[0034] The working principle and use process of the utility model: the pulverized coal coming through the pulverized coal pipeline 7 passes through the upper burner 3 with a concentrated pulverized coal burner at the bottom and a light pulverized coal burner at the top, and the lower burner 4 with a concentrated pulverized coal burner at the bottom, and is fully mixed with the hot air coming out of the secondary air nozzle 5, so as to improve the flame support capacity of the adjacent layers, and enable the boiler to reduce the load to 25% and still ensure the stability of boiler combustion; based on the principle of coupling the throttling reconstruction of the inlet of the parallel tube screen (group) by combustion adjustment to change the heat load distribution characteristics, a combustion adjustment and throttling matching technology is developed, and the combustion adjustment changes the heat load distribution characteristics and couples the throttling reconstruction of the inlet of the parallel tube screen (group) to achieve flow matching heat absorption in the tube group, eliminate overheating of the high-temperature reheater and reduce temperature deviation, and through the above-mentioned optimization and improvement, the requirements of deep peak regulation of the boiler are achieved.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A boiler flexibility deep peak-shaving optimization device, comprising a pulverized coal boiler furnace (1), wherein a pulverized coal pipeline (7) is provided at the front end of the pulverized coal boiler furnace (1), and characterized in that: The pulverized coal boiler furnace (1) is provided with a combustion-supporting assembly (2), an upper burner (3) and a lower burner (4) in sequence from top to bottom, and the upper burner (3) and the lower burner (4) are both thick-thin separation burners; A secondary air nozzle (5) is provided between the upper burner (3) and the lower burner (4), and a soot blower (6) is provided at the end of the furnace (1) of the pulverized coal boiler.

2. The boiler flexibility deep peak-shaving optimization device according to claim 1 is characterized by: The combustion-supporting component (2) comprises a primary air nozzle (21) and a burner group (22), and the burner group (22) is provided with a micro-oil igniter (23).

3. The boiler flexibility deep peak-shaving optimization device according to claim 2 is characterized in that: The micro-oil igniter (23) is arranged at one end of the pulverized coal boiler furnace (1) close to the upper burner (3).

4. The boiler flexibility deep peak-shaving optimization device according to claim 1 is characterized in that: The upper burner (3) is a lower-concentrated and upper-light coal powder burner, and the lower burner (4) is an upper-concentrated and lower-light coal powder burner.

5. The boiler flexibility deep peak-shaving optimization device according to claim 1 or 4, characterized in that: The upper burners (3) and the lower burners (4) are each in eight groups, and the airflow-coal powder distribution ratio of the upper burners (3) and the lower burners (4) is 7:

3.

6. The boiler flexibility deep peak-shaving optimization device according to claim 1 is characterized by: The soot blower (6) comprises a jet disk (61) arranged at the end of a pulverized coal boiler furnace (1); the jet disk (61) is provided with an array of jet holes (62); and the number of the jet holes (62) is eight groups.

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