Novel coal power unit system

Abstract

The utility model discloses a novel coal power unit system, which relates to the technical field of steam turbine main engines and comprises a boiler, a steam turbine main engine, a back extraction type steam turbine auxiliary engine, a condenser, a third high-pressure heater, a deaerator, a fourth low-pressure heater and a fifth low-pressure heater. The boiler is connected with a medium-pressure cylinder of a steam turbine main machine through a reheating hot section pipeline, a high-pressure cylinder of the steam turbine main machine is connected to the boiler through a reheating cold section pipeline, the main steam pipeline is provided with a high-pressure bypass pipeline, the high-pressure bypass pipeline is connected to the reheating cold section pipeline, and the reheating cold section pipeline is connected to the boiler. The reheating cold section pipeline is connected to the back extraction type steam turbine auxiliary engine through a reheating cold section bypass pipeline, and the back extraction type steam turbine auxiliary engine is connected with the third high-pressure heater, the deaerator, the fourth low-pressure heater and the fifth low-pressure heater through a steam extraction pipeline. During start-stop peak regulation, shutdown and no boiler shutdown can be achieved, and the requirement for rapid start-stop peak regulation is met.

Description

Technical Field

[0001] This application relates to the field of steam turbine main engine technology, specifically to a new type of coal-fired power unit system. Background Technology

[0002] like Figure 1 The diagram shown is a simplified structural diagram of a traditional coal-fired power unit system. When operating coal-fired power units are started up and shut down for peak shaving, both the boiler and the turbine main unit need to be shut down simultaneously. When they need to be restarted, the time required is very long, which cannot meet the needs of rapid peak shaving. Utility Model Content

[0003] The main objective of this application is to provide a novel coal-fired power unit system that aims to solve the aforementioned technical problems.

[0004] The technical solution adopted in this application is as follows:

[0005] A novel coal-fired power unit system includes a boiler, a steam turbine main unit, an extraction-back steam turbine auxiliary unit, a condenser, a No. 3 high-pressure heater, a deaerator, a No. 4 low-pressure heater, and a No. 5 low-pressure heater. The boiler is connected to the high-pressure cylinder of the steam turbine main unit via a main steam pipeline. The boiler is connected to the intermediate-pressure cylinder of the steam turbine main unit via a reheat hot section pipeline. The high-pressure cylinder of the steam turbine main unit is connected to the boiler via a reheat cold section pipeline. The main steam pipeline is equipped with a high-pressure bypass pipeline, which is connected to the reheat cold section pipeline. The reheat cold section pipeline is connected to the extraction-back steam turbine auxiliary unit via a reheat cold section bypass pipeline. The extraction-back steam turbine auxiliary unit is connected to the No. 3 high-pressure heater, the deaerator, the No. 4 low-pressure heater, and the No. 5 low-pressure heater via extraction steam pipelines.

[0006] Optionally, the intermediate-pressure cylinder and the low-pressure cylinder of the turbine main unit are interconnected by a pipeline.

[0007] Optionally, the low-pressure cylinder of the steam turbine main unit is connected to the condenser via a pipeline.

[0008] Optionally, the high-pressure cylinder of the turbine main unit is connected to the No. 1 high-pressure heater and the No. 2 high-pressure heater through extraction steam pipes.

[0009] Optionally, the low-pressure cylinder of the turbine main unit is connected to the No. 6 low-pressure heater and the No. 7 low-pressure heater via extraction steam pipes.

[0010] Compared with the prior art, the beneficial effects of this application are:

[0011] This application proposes a novel coal-fired power unit system. A high-pressure bypass pipeline is installed in the main steam pipeline of the turbine main unit, and a reheat cold section bypass pipeline connected to an extraction-back turbine auxiliary unit is installed in the reheat cold section pipeline. High-pressure hot steam enters the extraction-back turbine auxiliary unit from the high-pressure bypass pipeline through the reheat cold section pipeline and the reheat cold section bypass pipeline. The extraction-back turbine auxiliary unit supplies steam to the No. 3 high-pressure heater, deaerator, No. 4 low-pressure heater, and No. 5 low-pressure heater. When the main unit is shut down, steam only enters the extraction-back turbine auxiliary unit, providing partial steam for the high-pressure heater, low-pressure heater, and deaerator, driving the boiler feedwater pump, and providing plant power to maintain the auxiliary unit system's operation, ensuring normal boiler operation and achieving uninterrupted boiler operation during shutdown. When needed, the turbine can be quickly started to meet the requirements of rapid start-up and peak shaving. Attached Figure Description

[0012] Figure 1 A simplified structural diagram of a traditional coal-fired power unit system;

[0013] Figure 2 A simplified structural diagram of the novel coal-fired power unit system provided in the embodiments of this application.

[0014] Explanation of the labels in the attached drawings:

[0015] 1-Boiler, 2-High-pressure cylinder, 3-Medium-pressure cylinder, 4-Low-pressure cylinder, 5-Main steam pipe, 6-Reheat hot section pipe, 7-Reheat cold section pipe, 8-High-pressure bypass pipe, 9-Reheat cold section bypass pipe, 10-Extraction-back-type steam turbine auxiliary machine, 11-Condenser, 12-No. 1 high-pressure heater, 13-No. 2 high-pressure heater, 14-No. 3 high-pressure heater, 15-Deaerator, 16-No. 4 low-pressure heater, 17-No. 5 low-pressure heater, 18-No. 6 low-pressure heater, 19-No. 7 low-pressure heater. Detailed Implementation

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

[0017] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0018] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0019] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0020] See attached document Figure 2 This application provides a novel coal-fired power unit system, including a boiler 1, a steam turbine main unit, an extraction-back steam turbine auxiliary unit 10, a condenser 11, a No. 1 high-pressure heater 12, a No. 2 high-pressure heater 13, a No. 3 high-pressure heater 14, a deaerator 15, a No. 4 low-pressure heater 16, a No. 5 low-pressure heater 17, a No. 6 low-pressure heater 18, and a No. 7 pressure heater. The boiler 1 is connected to the high-pressure cylinder 2 of the steam turbine main unit through a main steam pipe 5. The high-pressure cylinder 2 supplies steam to the No. 1 high-pressure heater 12 and the No. 2 high-pressure heater 13 through extraction steam pipes. The boiler 1 is connected to the intermediate-pressure cylinder 3 of the steam turbine main unit through a reheat hot section pipe 6. The intermediate-pressure cylinder 3 of the steam turbine is interconnected with the low-pressure cylinder 4 of the steam turbine through a pipe. The low-pressure cylinder 4 of the steam turbine is connected to the condenser 11 through a pipe. At the same time, the low-pressure cylinder 4 of the steam turbine is also connected to the No. 6 pressure heater and the No. 7 low-pressure heater 19 through extraction steam pipes to supply steam.

[0021] At the same time, such as Figure 2As shown, the high-pressure cylinder 2 of the main turbine is connected to the boiler 1 through the reheat cold section pipe 7. The main steam pipe 5 is equipped with a high-pressure bypass pipe 8, which is connected to the reheat cold section pipe 7. The reheat cold section pipe 7 is connected to the extraction-back turbine auxiliary machine 10 through the reheat cold section bypass pipe 9. The extraction-back turbine auxiliary machine 10 is connected to the No. 3 high-pressure heater 14, the deaerator 15, the No. 4 low-pressure heater 16, and the No. 5 low-pressure heater 17 through the extraction steam pipe to supply steam.

[0022] It can be observed that the traditional coal-fired power unit system supplies steam to the No. 3 high-pressure heater 14, deaerator 15, No. 4 low-pressure heater 16, and No. 5 low-pressure heater 17 via extraction steam pipes. During start-up and peak shaving, both boiler 1 and the turbine need to be shut down simultaneously. When restarting, a long time is required to supply steam to the units connected to the intermediate-pressure cylinder 3 and low-pressure cylinder 4, failing to meet the needs of rapid peak shaving. The present application provides a novel coal-fired power unit system that improves upon the traditional system by cutting off the extraction steam pipes connecting the No. 3 high-pressure heater 14, deaerator 15, No. 4 low-pressure heater 16, and No. 5 low-pressure heater 17, and sealing the extraction port of the intermediate-pressure cylinder 3. A high-pressure bypass pipe 8 is connected to the main steam pipe 5, and this bypass pipe 8 is connected to the extraction-back turbine auxiliary unit 10 via the reheat cold section pipe 7 and the reheat cold section bypass pipe 9, thus combining the high-pressure steam with the relatively low-pressure steam. After the warm "exhaust gas" is mixed, it is introduced into the extraction-back steam turbine auxiliary machine 10, which is used as a "temporary medium-pressure cylinder". The extraction-back steam turbine auxiliary machine 10 directly supplies steam to the No. 3 high-pressure heater 14, deaerator 15, No. 4 low-pressure heater 16 and No. 5 low-pressure heater 17, thereby ensuring the normal operation of boiler 1, realizing shutdown without stopping the boiler, and meeting the needs of rapid start-up and peak shaving.

[0023] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A novel coal-fired power unit system, characterized in that, The system includes a boiler, a steam turbine main unit, an extraction-back steam turbine auxiliary unit, a condenser, a No. 3 high-pressure heater, a deaerator, a No. 4 low-pressure heater, and a No. 5 low-pressure heater. The boiler is connected to the high-pressure cylinder of the steam turbine main unit via a main steam pipeline. The boiler is connected to the intermediate-pressure cylinder of the steam turbine main unit via a reheat hot section pipeline. The high-pressure cylinder of the steam turbine main unit is connected to the boiler via a reheat cold section pipeline. The main steam pipeline is equipped with a high-pressure bypass pipeline, which is connected to the reheat cold section pipeline. The reheat cold section pipeline is connected to the extraction-back steam turbine auxiliary unit via a reheat cold section bypass pipeline. The extraction-back steam turbine auxiliary unit is connected to the No. 3 high-pressure heater, the deaerator, the No. 4 low-pressure heater, and the No. 5 low-pressure heater via extraction steam pipelines.

2. The novel coal-fired power unit system according to claim 1, characterized in that, The intermediate-pressure cylinder and the low-pressure cylinder of the turbine main unit are interconnected by a pipeline.

3. The novel coal-fired power unit system according to claim 1, characterized in that, The low-pressure cylinder of the steam turbine main unit is connected to the condenser via a pipeline.

4. The novel coal-fired power unit system according to claim 1, characterized in that, The high-pressure cylinders of the steam turbine main unit are connected to the No. 1 high-pressure heater and the No. 2 high-pressure heater through extraction steam pipes.

5. The novel coal-fired power unit system according to claim 1, characterized in that, The low-pressure cylinders of the turbine main unit are connected to the No. 6 low-pressure heater and the No. 7 low-pressure heater via extraction steam pipes.

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