Steam supplementing pipe heating and drain pipeline system and using method thereof

Abstract

The invention relates to the technical field of thermal power steam turbine power generation, in particular to a steam supplementing pipe heating and drain pipeline system and a using method thereof.The steam supplementing pipe heating and drain pipeline system comprises a steam guide pipe, a steam supplementing pipe, a steam guide heating pipe and a cylinder, and the steam guide pipe is connected to the cylinder and used for introducing steam into the cylinder; the steam supplementing pipe is connected to the cylinder and used for supplementing steam into the cylinder. The steam guide pipe and the steam supplementing pipe are provided with valves for controlling opening and closing of the steam guide pipe and the steam supplementing pipe. One end of the steam guide heating pipe is arranged on the steam guide pipe, and the other end is connected to the steam supplementing pipe; and the steam guide heating pipe is provided with a heating pipe control valve. The steam heating device has the advantages that complex manual operation and valve loss caused by frequently opening a steam supplementing valve or a drain valve of a steam supplementing pipe conventionally for heating the pipe are reduced, and the running safety of a unit is improved; by optimizing the steam guide heating pipe and the connecting mode of the steam guide heating pipe, it is ensured that the temperature of the steam supplementing pipeline can be kept even under the condition that the steam supplementing valve is closed, the problem of'dead zone 'in a traditional system is avoided, possible misoperation caused by conventional frequent manual operation of the heating pipe is reduced, and the running safety of a unit is improved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power steam turbine power generation, and in particular to a steam supply pipe heating pipe and drain pipe system and a use method thereof. Background Art

[0002] With the continuous improvement of economic requirements, high-power supercritical units have been widely used in the power industry. Such units usually adopt the technical solution of full-circle steam inlet + steam supply valve bypass steam distribution to improve the economy of the unit and meet the needs of power grid frequency regulation. However, in actual operation, the opening and closing of the steam supply valve is not completely random, but is restricted by many factors. Especially when operating below rated load, the steam supply valve often needs to remain closed for a long time due to the needs of power grid dispatching. Under this condition, the traditional U-shaped single-pipe layout exposes many problems.

[0003] First, when the steam supply valve is closed, there is no steam flow in the steam supply pipe, which makes the pipe a "dead zone" and makes it impossible to effectively warm up and drain the pipe. This not only increases the risk of pipe corrosion, but also may cause the accumulated water and cold steam in the pipe to be unable to be discharged in time, thus affecting the safe operation of the unit. In addition, due to the lack of effective monitoring methods, operators often find it difficult to detect and deal with these problems in a timely manner.

[0004] Secondly, during low-load operation, in order to ensure the stability and economy of the unit, the steam supply pipe needs to be drained regularly. However, traditional draining methods usually rely on manual operation, which is not only inefficient but also prone to accidents due to improper operation. Summary of the invention

[0005] The present invention aims to overcome the above-mentioned shortcomings of the prior art and provides a steam supply pipe heating pipe and drain pipe system and a use method thereof.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A steam supply pipe heating pipe and drain pipe system, characterized in that it comprises: a steam guide pipe, a steam supply pipe, a steam guide heating pipe and a cylinder,

[0008] The steam pipe is connected to the cylinder and is used to introduce steam into the cylinder;

[0009] The steam supply pipe is connected to the cylinder for supplying steam into the cylinder;

[0010] Both the steam guide pipe and the steam supplement pipe are provided with valves to control the steam inlet;

[0011] One end of the steam-conducting heating pipe is arranged on the steam-conducting pipe, and the other end is connected to the supplementary steam pipe. The steam-conducting heating pipe is provided with a heating pipe valve.

[0012] Furthermore, the supplementary steam pipe is provided with at least one temperature sensor.

[0013] Furthermore, the supplementary steam pipe is provided with a pressure sensor.

[0014] Furthermore, steam traps are provided at the low points of the steam supply pipe and the steam guide pipe.

[0015] Furthermore, it includes a control system, which is electrically connected to a heating pipe valve, a temperature sensor and a pressure sensor.

[0016] Furthermore, a method for using a steam supply pipe heating pipe and a drain pipe system comprises the following steps:

[0017] S1: The temperature sensor and pressure sensor monitor the temperature and pressure of the steam supply pipe in real time;

[0018] S2: Based on the monitored temperature and pressure data, the control system determines whether draining or pipe heating operations are required;

[0019] S3: When draining is required, open the drain valve to drain the accumulated water and cold steam and keep it for a while;

[0020] S4: When the steam supply pipe needs to be heated, steam enters the steam supply pipe from the steam guide pipe through the steam guide heating pipe to perform heat exchange and adjust the temperature of the steam supply pipe to ensure that the temperature of the steam supply pipe is always maintained above the set lower limit temperature.

[0021] Furthermore, in step S4, when the temperature of the supplementary steam pipe is lower than the temperature for starting the heating pipe, the control system controls the opening of the steam guide heating pipe valve, so that the high-temperature steam in the steam guide pipe enters the supplementary steam pipe through the steam guide heating pipe to perform heat exchange and continuously heat the pipe, thereby ensuring that the temperature of the supplementary steam pipe is not lower than the set temperature.

[0022] Furthermore, in step S1, the pressure of the supplementary steam pipe is monitored, and the control system calculates the saturated steam value temperature according to the pressure of the supplementary steam pipe.

[0023] Furthermore, the heating pipe temperature is set to the saturated steam value temperature plus 50 degrees.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0025] The application of the steam supply pipe heating pipe and drain pipe system of the present invention in thermal power units brings significant technical and safety benefits. The following are several major beneficial effects of the system:

[0026] 2. Enhanced safety: The automated drainage and pipe warming system reduces the safety operation problems of the steam turbine caused by water accumulation and cold steam, and extends the service life of the pipeline. In addition, the intelligent control system can respond to abnormal situations in a timely manner to prevent possible accidents, thus ensuring the safe operation of the power plant.

[0027] 3. Reduce maintenance costs: Since the system can automatically perform pipe heating and draining operations, it reduces the need for human intervention and the possibility of operating errors, thereby reducing the frequency and cost of repairs and replacement parts.

[0028] 4. Improve reliability: The design of the present invention takes into account the needs of long-term operation. By optimizing the steam heating pipe and its connection method, it ensures that the steam supply pipe can be kept warm even when the steam supply valve is closed, avoiding the "dead zone" problem in the traditional system.

[0029] 6. Flexibility and adaptability: The system of the present invention can automatically adjust according to different operating conditions and maintain good performance under both high and low loads, which makes it suitable for thermal power units of various sizes.

[0030] 7. Easy to monitor and manage: The integrated sensors and control system provide intuitive data feedback, allowing operators to easily monitor the operating status of the entire system and make adjustments when necessary.

[0031] 8. Promote technological innovation: The implementation of this invention has promoted technological progress in related fields and provided reference and reference for more efficient and safer thermal power technology in the future.

[0032] In summary, the supplementary steam pipe heating pipe and drain pipe system of the present invention not only solves the problems existing in the prior art, but also brings additional benefits in many aspects, and is an ideal choice for optimizing and upgrading thermal power units. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the arrangement structure of the supplementary steam pipeline of the present invention;

[0034] Figure 2 It is a schematic diagram of the arrangement structure of the steam supply pipeline in the prior art;

[0035] Markings in the figure:

[0036] 1-steam pipe, 2-steam supply pipe, 3-gas heating pipe, 4-cylinder, 5-heating pipe valve, 6-temperature sensor, 7-pressure sensor, 8-steam trap.

[0037] Specific Examples

[0038] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] like Figure 1 As shown, a steam supply pipe heating pipe and drain pipe system is characterized by comprising: a steam guide pipe 1, a steam supply pipe 2, a steam guide heating pipe 3 and a cylinder 4,

[0041] The steam pipe 1 is connected to the cylinder 4 and is used to introduce steam into the cylinder 4;

[0042] The steam supply pipe 2 is connected to the cylinder 4 for supplying steam into the cylinder 4;

[0043] Both the steam guide pipe 1 and the steam supplement pipe 2 are provided with valves for controlling their opening and closing;

[0044] One end of the steam conducting heating pipe is arranged on the steam conducting pipe 1, and the other end is connected to the supplementary steam pipe 2. The steam conducting heating pipe is provided with a heating pipe valve 5.

[0045] Specifically, the steam pipe 1 guides the hot steam generated by the boiler into the steam turbine. When the unit is above the design point THA (or TMCR) power, the steam supply valve opens. When the steam supply valve is closed, the temperature in the steam supply pipe 2 continues to drop. The drain pipe branch of the steam pipe 1 is connected to a steam heating pipe. The steam heating pipe is connected to the front end of the steam supply pipe 2 to expand the heating range as much as possible. When the temperature in the steam supply pipe 2 drops to a certain value, the heating pipe valve 5 on the steam heating pipe is opened to allow the hot steam in the steam pipe 1 to enter the steam supply pipe 2 for heat exchange to achieve the purpose of heating.

[0046] The system ensures efficient and safe operation of the system by real-time monitoring of the temperature and pressure of the steam supply pipe 2. This design improves the reliability and safety of the unit and reduces the risk of human operation.

[0047] Furthermore, the supplementary steam pipe 2 is provided with at least one temperature sensor 6 .

[0048] The introduction of the temperature sensor 6 enables the system to accurately monitor the temperature of the supplementary steam pipe 2, thereby performing pipe warming operations in a timely manner and preventing thermal shock to the steam turbine caused by the "dead zone".

[0049] Furthermore, the supplementary steam pipe 2 is provided with a pressure sensor 7 .

[0050] Furthermore, steam traps 8 are provided at the low points of the steam supply pipe 2 and the steam guide pipe 1 close to the valve side.

[0051] The setting of drain points effectively solves the problem of water accumulation and prevents pipeline corrosion and reduced thermal efficiency caused by water accumulation.

[0052] Furthermore, it includes a control system, which is electrically connected to a heating pipe valve 5, a temperature sensor 6 and a pressure sensor 7.

[0053] The introduction of the control system enables automated management of the entire system, improves response speed and accuracy, and reduces the need for human intervention.

[0054] Furthermore, a method for using a steam supply pipe heating pipe and a drain pipe system comprises the following steps:

[0055] S1: The temperature sensor 6 and the pressure sensor 7 monitor the temperature and pressure of the steam supply pipe 2 in real time;

[0056] S2: Based on the monitored temperature and pressure data, the control system determines whether draining or pipe heating operations are required;

[0057] S3: When draining is required, the drain valve 8 is opened to drain the accumulated water and cold steam, and the drain valve is kept open for a period of time;

[0058] S4: When the steam supply pipe 2 needs to be heated, steam enters the steam supply pipe 2 from the steam guide pipe 1 through the steam guide heating pipe 3, and controls the temperature of the steam supply pipe 2 to always be above the set lower limit temperature.

[0059] The method realizes intelligent management of the supplementary steam pipe 2 and the air heating pipe 3 through automatic control, improves the response speed and accuracy of the system, and reduces the need for manual intervention.

[0060] Furthermore, in step S4, when the temperature of the steam supply pipe 2 is lower than the opening temperature of the heating pipe, the control system controls the opening of the heating pipe valve 5, so that the high-temperature steam in the steam pipe 1 enters the steam supply pipe 2 through the steam heating pipe for heat exchange to maintain the temperature of the steam supply pipe 2.

[0061] This measure effectively avoids the formation of a "dead zone" in the pipeline behind the steam supply valve due to the steam supply valve not being opened, and ensures that even when the steam supply valve is closed, the steam supply pipe 2 can be effectively warmed up to ensure that the pipeline is capable of being put into operation at any time.

[0062] Furthermore, in step S1 , the pressure of the supplementary steam pipe 2 is monitored, and the control system calculates the saturated steam value temperature according to the pressure of the supplementary steam pipe 2 .

[0063] Through comparative analysis, the system can more accurately determine whether draining or pipe heating operations are needed, thereby improving the accuracy and efficiency of decision-making.

[0064] Furthermore, the heating pipe temperature is set to the saturated steam value temperature plus 50 degrees.

[0065] This calculation method ensures that the inner wall temperature of the steam supply pipe 2 is always maintained within a safe range, preventing thermal shock to the pipeline caused by the sudden operation of the steam supply valve, thereby affecting the life of the pipeline.

[0066] The specific operation steps of controlling the steam supply are as follows:

[0067] 1. Real-time monitoring: The temperature sensor 6 and the pressure sensor 7 monitor the temperature and pressure of the steam supply pipe 2 in real time. These data are transmitted to the control system for further analysis and processing.

[0068] 2. Data analysis: The control system determines whether the current operating status requires draining or pipe warming based on the received temperature and pressure data. This step is key to ensuring that the system can respond in a timely manner and take appropriate measures.

[0069] 3. Drainage operation: If drainage is required, the control system will issue a command to open the drain valve 8. This will drain the accumulated water and cold steam and maintain it for a period of time to ensure that the moisture and condensate in the pipeline are completely removed.

[0070] 4. Pipe heating operation: If it is necessary to warm up the steam supply pipe 2, the control system will issue a command to open the pipe heating valve 5. Steam enters the steam supply pipe 2 from the steam pipe 1 through the steam heating pipe, and the temperature of the steam supply pipe 2 is always maintained above the set lower limit temperature. This step ensures that the inner wall temperature of the steam supply pipe 2 will not be too low, thereby avoiding the loss of the life of the steam supply pipe 2 due to thermal shock.

[0071] 5. Adjust the steam supply: By adjusting the temperature of the steam supply pipe 2, the amount of new steam entering the steam supply pipe 2 is controlled. The control system will calculate the saturated steam temperature corresponding to the pressure according to the measured pressure of the steam supply pipe 2, and set the saturated temperature plus a certain value (such as 50°C) as the lower limit of the inner wall temperature of the steam supply pipe 2. By adjusting the opening of the warm-up valve 5, the temperature of the steam supply pipe 2 is regulated and controlled, so that the steam supply pipe 2 is always at the working temperature.

[0072] 6. Record operating parameters: After each operation, record relevant operating parameters, such as temperature, pressure, valve status, etc. These data can be used for subsequent data analysis and performance optimization.

[0073] 7. Regular inspection and maintenance: Regularly check the various components of the system, including temperature sensors 6, pressure sensors 7, valves, etc., to ensure that they are in good working condition. At the same time, perform necessary maintenance on the system, such as cleaning, lubrication, etc.

[0074] 8. Operator training: Operators should be trained to familiarize them with the system's operating procedures and precautions. This ensures that they can take prompt measures in an emergency to avoid accidents. The above description is only a preferred embodiment of the invention and is not intended to limit the invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the invention should be included in the protection scope of the invention.

Claims

1. A steam supply pipe heating and drain pipe system, characterized in that: include: A steam guide pipe (1), a steam supplement pipe (2), a steam guide heating pipe and a steam cylinder (4), wherein the steam guide pipe (1) is connected to the steam cylinder (4) for introducing steam into the steam cylinder (4); The steam supply pipe (2) is connected to the cylinder (4) and is used to supply steam into the cylinder (4); The steam guide pipe (1) and the steam supplement pipe (2) are both provided with valves for controlling the steam inlet thereof; One end of the steam conducting heating pipe is arranged on the steam conducting pipe (1), and the other end is connected to the supplementary steam pipe (2). The steam conducting heating pipe is provided with a heating pipe valve (5).

2. The steam supply pipe heating and drain pipe system according to claim 1, characterized in that: The supplementary steam pipe (2) is provided with at least one temperature sensor (6).

3. The steam supply pipe heating and drain pipe system according to claim 2, characterized in that: The supplementary steam pipe (2) is provided with a pressure sensor (7).

4. The steam supply pipe heating and drain pipe system according to claim 1, characterized in that: A steam trap (8) is provided at the low point of the steam supply pipe (2) and the steam guide pipe (1).

5. The steam supply pipe heating and drain pipe system according to claim 3, characterized in that: It comprises a control system, wherein the control system is electrically connected to a heating pipe valve (5), a temperature sensor (6) and a pressure sensor (7).

6. A method for using a steam supply pipe heating and drain pipe system, applied to a steam supply pipe heating and drain pipe system as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S1: The temperature sensor (6) and the pressure sensor (7) monitor the temperature and pressure of the steam supply pipe (2) in real time; S2: Based on the monitored temperature and pressure data, the control system determines whether draining or pipe heating operations are required; S3: When drainage is required, the drain valve (8) is opened to drain the accumulated water and cold steam, and the drain valve is kept open for a period of time; S4: When the steam supply pipe (2) needs to be heated, steam is passed from the steam guide pipe (1) through the steam guide heating pipe into the steam supply pipe (2), and the temperature of the steam supply pipe (2) is adjusted to always be maintained above the set lower limit temperature.

7. The method for using the steam supply pipe heating and drain pipe system according to claim 6, characterized in that: In step S4, when the temperature of the supplementary steam pipe (2) is lower than the temperature for opening the heating pipe, the control system controls the opening of the heating pipe valve (5), so that the high-temperature steam in the steam guide pipe (1) enters the supplementary steam pipe (2) through the steam guide heating pipe to perform heat exchange, thereby ensuring that the temperature of the supplementary steam pipe (2) is not lower than the set temperature.

8. The method for using the steam supply pipe heating and drain pipe system according to claim 7, characterized in that: In step S1, the pressure of the supplementary steam pipe (2) is monitored, and the control system calculates the saturated steam value temperature according to the pressure of the supplementary steam pipe (2).

9. The method for using the steam supply pipe heating and drain pipe system according to claim 8, characterized in that: The heating pipe opening temperature is set to the saturated steam value temperature plus 50 degrees.

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