Drainage pipeline structure for high-pressure heater

Abstract

The utility model provides a drain pipeline structure for a high-pressure heater, a drain pipeline is connected with a deaerator through a normal drain return pipeline, the outlet end of the deaerator is connected with a water inlet pipe of the high-pressure heater, and a pressurized drain return pipeline parallel to the normal drain return pipeline is added between the drain pipeline and the deaerator. A flow velocity pressure sensor and a temperature sensor are mounted on the drainage pipeline; meanwhile, an execution valve, a pump and a controller are arranged, so that automatic control over the flow of the drainage pipeline can be achieved, smooth drainage during peak shaving of the steam turbine is guaranteed, and unit operation safety and economical efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of thermal power generation technology, specifically a drainage pipe structure for a high-pressure heater. Background Technology

[0002] High-pressure heaters are devices that use a portion of the extracted steam from a steam turbine to heat feedwater. As a heat conversion device, they are mainly used in the regenerative systems of large thermal power units. Because they employ a heat exchange principle, the steam in the high-pressure heater forms condensate, which is then drained and reused. However, when the steam turbine generator units in thermal power plants experience low peak loads and low extraction pressures in the high-pressure heaters, condensate drainage can be impaired, especially in the No. 3 high-pressure heater, which is prone to leakage. This directly affects the unit's economy and safety; therefore, timely and accurate drainage is crucial. In light of this, a drainage pipe structure for high-pressure heaters is proposed. Summary of the Invention

[0003] The technical solution adopted by this utility model to solve the problems in the background art is as follows:

[0004] A drain pipe structure for a high-pressure heater includes a drain pipe connected to the drain end of the high-pressure heater, the drain pipe being connected to a deaerator via a normal drain return pipe, the outlet end of the deaerator being connected to the inlet pipe of the high-pressure heater, and a pressurized drain return pipe being added between the drain pipe and the deaerator, arranged parallel to the normal drain return pipe. A first electrically controlled valve and a second electrically controlled valve are installed on the normal drain return pipe, and a second feed pump is also installed on the pressurized drain return pipe.

[0005] A flow rate pressure sensor and a temperature sensor are installed on the drainage pipe;

[0006] It also includes a controller, the flow rate and pressure sensor and the temperature sensor are able to transmit the collected information data to the controller, the second feed pump and the solenoid valve are communicatively connected, and the controller is able to control the second feed pump, the first solenoid valve and the second solenoid valve.

[0007] Preferably, a pressure-reducing drain return pipe is provided at the drain pipe and the outlet end of the deaerator, and a one-way valve and a third electrically controlled valve are provided on the pressure-reducing drain return pipe, and the controller is capable of controlling the third electrically controlled valve.

[0008] Preferably, a condensate pipe is connected to the end of the drain pipe, and a fourth electrically controlled valve is provided at the connection point, wherein the controller is capable of controlling the fourth electrically controlled valve.

[0009] Preferably, a first feed pump is provided between the deaerator and the inlet pipe of the high-pressure heater, and the controller can control the start and stop of the first feed pump.

[0010] Preferably, a flow rate and pressure sensor 4 is installed between the pressurized drainage return pipe and the deaerator pipe.

[0011] Preferably, a one-way valve is installed between the pressurized drainage return pipe and the deaerator pipe.

[0012] Preferably, the second pump is a variable frequency pump.

[0013] The beneficial effects of this utility model are that it sets up parallel drainage pipes on the side of the original drainage pipes, and installs sensors on the drainage pipes to detect the drainage status, as well as actuators and pumps, and a controller that can process sensor information and control the operation of valves and pumps. This enables automatic control of the flow rate of the drainage pipes, ensuring smooth drainage during turbine peak shaving, and improving the safety and economy of unit operation. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0015] Figure 1 This is a schematic diagram of the high-pressure heater drainage pipe structure provided in this embodiment of the utility model;

[0016] Figure 2 This is a schematic diagram of the drainage pipe control system provided in this embodiment of the utility model;

[0017] In the diagram: 1-High-pressure heater, 2-High-pressure cylinder, 3-Drainage pipe, 4-Flow rate and pressure sensor, 5-Temperature sensor, 6-Depressurized drainage return pipe, 7-Deaerator, 8-Normal drainage return pipe, 9-Pressurized drainage return pipe, 10-Condensate pipe, 11-First feed pump, 12-Second feed pump, 13-Boiler, a-First solenoid valve, b-Second solenoid valve, c-Third solenoid valve, d-Fourth solenoid valve. Detailed Implementation

[0018] The above solution will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrating the present invention and not for limiting the scope of the present invention. The implementation conditions used in the embodiments can be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0019] In one specific embodiment, a condensate drain pipe structure for a high-pressure heater is provided, including a condensate drain pipe 3 connected to the condensate drain end of the high-pressure heater 1. The condensate drain pipe 3 of the high-pressure heater 1 is connected to a deaerator 7 through a condensate return pipe 8. The outlet end of the deaerator 7 is connected to the inlet pipe of the high-pressure heater 1. When the extraction pressure in the high-pressure heater is normal, some steam enters the high-pressure heater from the high-pressure cylinder 2 of the steam turbine. After heat exchange, condensate is generated. Then, the condensate enters the deaerator 7 through the condensate drain pipe 3 and is then sent to the boiler 13 for reheating.

[0020] However, during peak shaving of the steam turbine, the high-pressure heater 1 experiences reduced extraction pressure, and the deaerator 7 and pipeline resistance cause poor drainage, resulting in condensate drainage problems. This directly affects the unit's economy and safety. Therefore, this application adds a parallel drainage pipeline to the existing drainage pipeline. Specifically, a pressurized drainage return pipeline 9 is added between the drainage pipeline 3 and the deaerator 7, running parallel to the normal drainage return pipeline 8. To achieve flow control, a first electrically controlled valve a is installed on the normal drainage return pipeline 8, and a second electrically controlled valve b is installed on the pressurized drainage return pipeline 9. The on / off state and opening degree of the normal drainage return pipeline 8 and the pressurized drainage return pipeline 9 are controlled by the electrically controlled valves. A second feed pump 12 is also installed on the pressurized drainage return pipeline 9 to achieve pressurization. This application preferably sets the second feed pump 12 as a variable frequency pump, thereby enabling control of the drainage pressure.

[0021] In order to achieve automatic control of drainage, it is necessary to detect the drainage status. Therefore, a flow rate and pressure sensor 4 and a temperature sensor 5 are installed on the drainage pipe 3. The drainage status is detected by combining the flow rate and pressure sensor 4 with the drainage temperature.

[0022] In summary, to achieve automatic drainage control, a controller is also included. In this application, the controller comprises a PLC and several relays. During operation, the flow rate and pressure sensor 4 and the temperature sensor 5 detect the drainage status of the pipeline and transmit the collected data to the controller. The controller calculates the control signal according to a specified algorithm. The second feed pump 12 and each electrically controlled valve are communicatively connected to the controller, which can control the second feed pump 12, the first electrically controlled valve a, and the second electrically controlled valve b. This achieves flow control in the drainage pipeline, ensuring smooth drainage during turbine peak shaving and improving unit operation safety and economy.

[0023] Furthermore, based on this, a pressure-reducing drain return pipe 6 is installed at the outlet end of the drain pipe 3 and the deaerator 7. A one-way valve and a third electrically controlled valve c are installed on the pressure-reducing drain return pipe 6, and the controller can control the third electrically controlled valve c. The significance of this pipe is that when the drain does not require pressurization by the second feed pump 12, the drain can be directly connected to the outlet end of the deaerator 7. This avoids the influence of the deaerator 7's resistance, thereby achieving smooth draining and saving energy.

[0024] Therefore, the above three types of hydrophobic control can meet the hydrophobic needs under different working conditions and achieve automatic control.

[0025] To ensure safe drainage and water supply, this application connects a condensate pipe 10 to the end of the drainage pipe 3, and a fourth electrically controlled valve d is installed at the connection. When the drainage volume is insufficient, the controller controls the fourth electrically controlled valve d to open to a certain degree, so that the condensate can be sent to the drainage pipe.

[0026] In addition, to further provide over-drain pressure to ensure drainage volume, a first feed pump 11 is installed between the deaerator 7 and the inlet pipe of the high-pressure heater 1. Similarly, the controller can control the operation and stop of the first feed pump 11.

[0027] To further monitor the pressure of the drain pipe at the rear end of the second feed pump 12, a flow rate and pressure sensor 4 is installed between the pressurized drain return pipe 9 and the deaerator 7 pipe to further detect the flow rate, pressure and flow of the drain pipe.

[0028] To avoid energy loss caused by the excessive length of the normal drain return pipe 8 and the drainage from the pressurized drain return pipe 9 entering the normal drain return pipe 8, a one-way valve is installed between the pressurized drain return pipe 9 and the deaerator 7 pipe. This prevents the pressurized drain return pipe 9 from being opened and allowing drainage to enter the normal drain return pipe 8.

[0029] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A drain pipe structure for a high-pressure heater, comprising a drain pipe (3) connected to the drain end of a high-pressure heater (1), the drain pipe (3) being connected to a deaerator (7) via a normal drain return pipe (8), the outlet end of the deaerator (7) being connected to the inlet pipe of the high-pressure heater (1), characterized in that, A pressurized drain return pipe (9) is added between the drain pipe (3) and the deaerator (7) and is arranged in parallel with the normal drain return pipe (8). A first electrically controlled valve (a) is installed on the normal drain return pipe (8) and a second electrically controlled valve (b) is installed on the pressurized drain return pipe (9). A second feed pump (12) is also installed on the pressurized drain return pipe (9). A flow rate pressure sensor (4) and a temperature sensor (5) are installed on the drainage pipe (3); It also includes a controller, the flow rate pressure sensor (4) and temperature sensor (5) are able to transmit collected information data to the controller, the second feed pump (12) and the solenoid valve are communicatively connected, and the controller is able to control the second feed pump (12), the first solenoid valve (a) and the second solenoid valve (b).

2. The drainage pipe structure for a high-pressure heater as described in claim 1, characterized in that, A pressure-reducing drainage return pipe (6) is provided at the outlet end of the drainage pipe (3) and the deaerator (7), and a one-way valve and a third solenoid valve (c) are provided on the pressure-reducing drainage return pipe (6), and the controller is able to control the third solenoid valve (c).

3. A condensate drain pipe structure for a high-pressure heater as described in claim 1 or 2, characterized in that, A condensate pipe (10) is connected to the end of the drain pipe (3), and a fourth electrically controlled valve (d) is provided at the connection point. The controller is capable of controlling the fourth electrically controlled valve (d).

4. The drainage pipe structure for a high-pressure heater as described in claim 1, characterized in that, A first feed pump (11) is provided between the deaerator (7) and the inlet pipe of the high-pressure heater (1), and the controller can control the start and stop of the first feed pump (11).

5. The drainage pipe structure for a high-pressure heater as described in claim 1, characterized in that, A flow rate pressure sensor (4) is installed between the pressurized drainage return pipe (9) and the deaerator (7) pipe.

6. The drainage pipe structure for a high-pressure heater as described in claim 1, characterized in that, A one-way valve is installed between the pressurized drainage return pipe (9) and the deaerator (7) pipe.

7. The drainage pipe structure for a high-pressure heater as described in claim 1, characterized in that, The second feed pump (12) is a variable frequency pump.

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