A dual-unit boiler hot air mutual aid system

Abstract

The utility model discloses a kind of dual-unit boiler hot air mutual aid system, it is related to the technical field of power plant equipment, including first furnace hot primary air main pipe, second furnace hot primary air main pipe and liaison main pipe;First furnace hot primary air main pipe is the primary hot air main pipe of first boiler in first unit;Second furnace hot primary air main pipe is the primary hot air main pipe of second boiler in second unit;The one end of liaison main pipe is communicated with first furnace hot primary air main pipe, and the other end of liaison main pipe is communicated with second furnace hot primary air main pipe;Electric control regulating valve is provided on liaison main pipe, and electric control regulating valve is used to adjust the hot air flow size that flows through liaison main pipe.It can guarantee economy, improve heating effect.

Description

Technical Field

[0001] This utility model relates to the field of power plant equipment technology, and in particular to a hot air mutual support system for dual-unit boilers. Background Technology

[0002] The dual-unit mode is a power plant layout with two independently configured boilers but sharing an auxiliary system. Because the hot air system of each unit operates independently, it cannot quickly obtain sufficient high-temperature primary air during the initial ignition phase, leading to a decrease in pulverized coal combustion efficiency. Conventionally, this is addressed by adding a heater to heat the primary air or extending the boiler's fuel oil ignition time to preheat the system. However, adding a heater results in a slow response time and a long heating time; furthermore, fuel oil heating increases fuel consumption, leading to poor economic efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a hot air mutual assistance system for dual-unit boilers to solve the problems existing in the prior art, ensure economy, and improve heating effect.

[0004] To achieve the above objectives, this utility model provides the following solution: This utility model provides a hot air mutual support system for dual-unit boilers, including a first boiler primary hot air main pipe, a second boiler primary hot air main pipe, and a connecting main pipe; the first boiler primary hot air main pipe is the primary hot air main pipe of the first boiler in the first unit; the second boiler primary hot air main pipe is the primary hot air main pipe of the second boiler in the second unit; one end of the connecting main pipe is connected to the first boiler primary hot air main pipe, and the other end of the connecting main pipe is connected to the second boiler primary hot air main pipe; an electrically controlled regulating valve is provided on the connecting main pipe, and the electrically controlled regulating valve is used to regulate the flow rate of hot air flowing through the connecting main pipe.

[0005] Preferably, the connecting main pipe is also provided with an isolation valve, which can block the flow of hot air in the connecting main pipe.

[0006] Preferably, the electrically controlled regulating valve includes a first electrically controlled regulating valve and a second electrically controlled regulating valve, both of which are mounted on the connecting main pipe; the first electrically controlled regulating valve is used for communication connection with the controller of the first unit; and the second electrically controlled regulating valve is used for communication connection with the controller of the second unit.

[0007] Preferably, at least one first air preheater is connected to the first furnace hot primary air header.

[0008] Preferably, at least one second air preheater is connected to the second furnace hot primary air header.

[0009] Preferably, both the first furnace primary air header and the second furnace primary air header are connected to plasma heaters.

[0010] Preferably, both ends of the connecting main pipe are connected to the first furnace hot primary air main pipe and the second furnace hot primary air main pipe via flanges, respectively.

[0011] Preferably, the isolation valve is a manual valve.

[0012] The present invention achieves the following technical advantages over the prior art: The dual-unit boiler hot air mutual assistance system provided by this utility model connects the first and second units through a connecting main pipe. When the boiler of one unit (such as the first unit) needs to be restarted after shutdown, it can be supplemented by the hot primary air from the other normally operating unit (the second unit) through the connecting main pipe. The surplus hot air from the operating boiler can be used to provide support. The electronically controlled regulating valve on the connecting main pipe can adjust the hot air delivery volume in real time to avoid the problems of "over-delivery" or "under-delivery" during the mutual assistance process. The hot air mutual assistance between the two units forms a "complementary buffer", ensuring economy and improving heating effect. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A schematic diagram of the overall structure of the dual-unit boiler hot air mutual assistance system provided by this utility model.

[0015] In the diagram: 1-First boiler hot primary air main pipe; 2-Isolation valve; 3-Connecting main pipe; 4-First electric regulating valve; 5-Second electric regulating valve; 6-Second boiler hot primary air main pipe; 7-First air preheater; 8-Second air preheater; 9-Plasma heater. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] The purpose of this invention is to provide a hot air mutual assistance system for dual-unit boilers to solve the problems existing in the prior art, ensure economy, and improve heating effect.

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Example 1 This embodiment provides a dual-unit boiler hot air mutual assistance system, such as Figure 1 As shown, it includes a primary hot air header 1 for the first boiler, a primary hot air header 6 for the second boiler, and a connecting header 3. The primary hot air header 1 for the first boiler is the primary hot air header of the first boiler in the first unit (primary hot air header: a pressure pipeline that transports high-temperature air (about 300°C) to each coal mill). The primary hot air header 6 for the second boiler is the primary hot air header of the second boiler in the second unit. One end of the connecting header 3 is connected to the primary hot air header 1 for the first boiler, and the other end of the connecting header 3 is connected to the primary hot air header 6 for the second boiler. An electrically controlled regulating valve is installed on the connecting header 3, which is used to regulate the flow rate of hot air flowing through the connecting header 3.

[0020] By setting up a connecting main pipe 3 to link the first and second units, when the boiler of one unit (such as the first unit) needs to be restarted after shutdown, the hot primary air from the other normally operating unit (the second unit) can be supplemented through the connecting main pipe 3. The surplus hot air from the operating boiler can be used to provide support. The electronically controlled regulating valve on the connecting main pipe 3 can adjust the hot air delivery volume in real time to avoid the problems of "over-delivery" or "under-delivery" during mutual assistance. The hot air mutual assistance between the two units forms a "complementary buffer", ensuring economy and improving heating effect.

[0021] Specifically, by constructing a hot air mutual support channel between units, the operating units can deliver auxiliary hot air to the ignition units, rapidly increasing the coal mill outlet air temperature to above 60°C.

[0022] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, an isolation valve 2 is also installed on the connecting main pipe 3, which can block the flow of hot air in the connecting main pipe 3.

[0023] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, the electrically controlled regulating valve includes a first electrically controlled regulating valve 4 and a second electrically controlled regulating valve 5, both of which are mounted on the connecting main pipe 3; the first electrically controlled regulating valve 4 is used for communication connection with the controller of the first unit; the second electrically controlled regulating valve 5 is used for communication connection with the controller of the second unit.

[0024] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1As shown, at least one first air preheater 7 (specifically two, the same as those on the second boiler's hot primary air main pipe 6) is connected to the first boiler's hot primary air main pipe 1.

[0025] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, at least one second air preheater 8 (specifically two, the same as those on the first boiler's hot primary air main pipe 1) is connected to the second boiler's hot primary air main pipe 6.

[0026] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, plasma heaters 9 are connected to both the first furnace hot primary air main pipe 1 and the second furnace hot primary air main pipe 6 (which are existing devices used for heating, and their connection method and function are the same as the existing ones, so they will not be described in detail).

[0027] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, the two ends of the connecting main pipe 3 are connected to the first boiler hot primary air main pipe 1 and the second boiler hot primary air main pipe 6 through flanges, respectively.

[0028] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, isolation valve 2 is a manual valve.

[0029] Specifically, the connecting main pipe 3 is a high-temperature (450℃) stainless steel pipe with a diameter of 150mm, and its two ends are connected to the corresponding first furnace hot primary air main pipe 1 and second furnace hot primary air main pipe 6 by flanges.

[0030] Specifically, both the first air preheater 7 and the second air preheater 8 are heat exchange devices that use the high-temperature flue gas from their respective boilers to heat the air. They are existing devices, and their connection methods and functions are the same as those of the existing devices, so they will not be described in detail here.

[0031] Workflow: ① When the first boiler is ignited, the isolation valve 2 is opened; the controller of the first unit changes the opening degree of the first electric regulating valve 4 according to the ignition signal, temperature and air pressure required by the first boiler. ② 5%-8% of the hot air from the second primary air header 6 of the second boiler in operation is injected into the first primary air header 1 of the first boiler via the connecting header 3; ③ The temperature of the hot air in the primary hot air header 1 of the first furnace is increased after mixing; the increase formula is as follows: T mix = (Q1×T1+ Q2×T2) / (Q1+Q2) (Q1: Air volume produced by the first boiler, T1: Air temperature produced by the boiler; Q2: Supported air volume, T2: Supported air temperature (usually 320℃)) ④ When the outlet air temperature of the coal mill rises to above 60℃, the coal powder combustion rate can be increased to 98%.

[0032] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A hot air mutual assistance system for dual-unit boilers, characterized in that: This includes the primary hot air header of the first boiler, the primary hot air header of the second boiler, and the connecting header; The first primary hot air header is the primary hot air header of the first boiler in the first unit; The second primary hot air header is the primary hot air header of the second boiler in the second unit; One end of the connecting main pipe is connected to the first furnace hot primary air main pipe, and the other end of the connecting main pipe is connected to the second furnace hot primary air main pipe; An electrically controlled regulating valve is installed on the connecting main pipe, which is used to regulate the flow rate of hot air flowing through the connecting main pipe.

2. The dual-unit boiler hot air mutual assistance system according to claim 1, characterized in that: The connecting main pipe is also equipped with an isolation valve, which can block the flow of hot air inside the connecting main pipe.

3. The dual-unit boiler hot air mutual assistance system according to claim 1, characterized in that: The electrically controlled regulating valve includes a first electrically controlled regulating valve and a second electrically controlled regulating valve, both of which are mounted on the connecting main pipe. The first electric regulating valve is used for communication connection with the controller of the first unit; The second electric regulating valve is used for communication connection with the controller of the second unit.

4. The dual-unit boiler hot air mutual assistance system according to claim 1, characterized in that: At least one first air preheater is connected to the first primary air header of the first furnace.

5. The dual-unit boiler hot air mutual assistance system according to claim 1, characterized in that: At least one second air preheater is connected to the primary air header of the second furnace.

6. The dual-unit boiler hot air mutual assistance system according to claim 1, characterized in that: Both the first and second furnace primary air main pipes are connected to plasma heaters.

7. The dual-unit boiler hot air mutual assistance system according to claim 1, characterized in that: The two ends of the connecting main pipe are respectively connected to the first furnace hot primary air main pipe and the second furnace hot primary air main pipe via flanges.

8. The dual-unit boiler hot air mutual assistance system according to claim 2, characterized in that: The isolation valve is a manual valve.

Images