Unit steam extraction pressure reducing regulating device

Abstract

The utility model discloses a kind of unit steam extraction pressure reducing regulating device, it is related to thermal power generation equipment technical field, including base, the base is sequentially provided with pressure reducing assembly, pipeline connecting assembly and monitoring control assembly, the pressure reducing assembly includes and primary electric pressure reducing valve and secondary electric pressure reducing valve fixedly installed in sequence on the top outer wall of base, and pipeline connecting assembly includes import connector, connecting pipe and export connector, the monitoring control assembly includes import pressure sensor installed on import connector, middle pressure sensor installed on connecting pipe, export pressure sensor installed on export connector and controller fixedly installed on the top outer wall of base.The utility model can carry out accurate control to export pressure fluctuation range by the multitransducer feedback of primary electric pressure reducing valve and secondary electric pressure reducing valve's grading regulation and import pressure sensor, middle pressure sensor and export pressure sensor, satisfy the demand of precision steam equipment.

Description

Technical Field

[0001] This utility model relates to the field of thermal power generation equipment technology, and in particular to a unit extraction steam pressure reduction and regulation device. Background Technology

[0002] In thermal power plants or industrial waste heat recovery systems, steam turbines extract a portion of the steam that has already performed work (extraction steam) to supply energy to heat users (such as heating networks, industrial heating equipment, etc.). Since the steam pressure output from different extraction ports of the turbine is usually much higher than the rated pressure of downstream steam-using equipment, a pressure-reducing regulating device is needed to lower the extraction steam pressure to the target value. Traditional extraction steam pressure reduction mainly relies on manual regulating valves or single-function pressure-reducing valves, which have the following drawbacks: 1. Low pressure control accuracy: Manual adjustment relies on human experience and is difficult to respond to fluctuations in steam extraction flow in real time, resulting in unstable downstream pressure. This may cause overpressure damage or underpressure reduction in efficiency of steam-using equipment, and fail to meet the needs of precision steam-using equipment. 2. A single pressure reducing valve can only adapt to fixed operating conditions. When the steam extraction flow rate changes significantly (such as during unit start-up and shutdown or sudden changes in steam load), it cannot simultaneously ensure stable regulation of both high pressure differential and low pressure differential. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a unit extraction steam pressure reduction and regulation device. Through the coordinated action of a multi-stage pressure reduction structure, real-time pressure feedback, and controller, it achieves precise regulation of extraction steam pressure and overpressure protection.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A unit extraction steam pressure reduction regulating device includes a base, on which pressure reduction components, pipeline connection components and monitoring and control components are sequentially arranged. The pressure reducing assembly includes a primary electric pressure reducing valve and a secondary electric pressure reducing valve, which are sequentially fixedly installed on the outer wall of the top of the base, and the pipeline connection assembly includes an inlet pipe, a connecting pipe, and an outlet pipe. The monitoring and control components include an inlet pressure sensor installed on the inlet pipe, an intermediate pressure sensor installed on the connecting pipe, an outlet pressure sensor installed on the outlet pipe, and a controller fixedly installed on the outer wall of the top of the base.

[0005] As a preferred technical solution, the primary electric pressure reducing valve is a sleeve-type pressure reducing valve structure, and the secondary electric pressure reducing valve is a pilot-operated diaphragm valve structure.

[0006] As a preferred technical solution, the inlet end of the primary electric pressure reducing valve is connected to the inlet pipe through a first flange connector, and both ends of the connecting pipe are connected to the outlet end of the primary electric pressure reducing valve and the inlet end of the secondary electric pressure reducing valve in sequence through a second flange connector.

[0007] As a preferred technical solution, the outlet end of the secondary electric pressure reducing valve is connected to the outlet pipe through a third flange connector, and a safety valve is installed on the outlet pipe. When the outlet pressure exceeds the safety threshold, the pressure can be automatically released through the safety valve.

[0008] As a preferred technical solution, both the primary and secondary electric pressure reducing valves are electrically connected to the controller, and the inlet pressure sensor, intermediate pressure sensor, and outlet pressure sensor are also electrically connected to the controller. In this way, the controller will dynamically adjust the opening of the primary and secondary electric pressure reducing valves according to the real-time signals from the inlet pressure sensor, intermediate pressure sensor, and outlet pressure sensor, so that the outlet pressure is stabilized within the set range.

[0009] As a preferred technical solution, the internal flow channels of the primary electric pressure reducing valve and the secondary electric pressure reducing valve adopt a circular arc transition design structure. This design structure can reduce steam flow resistance and eddy current loss, thereby improving the overall thermal efficiency of the system.

[0010] The beneficial effects of this utility model are as follows: 1. Through the graded adjustment of the primary and secondary electric pressure reducing valves and the multi-sensor feedback of the inlet pressure sensor, intermediate pressure sensor and outlet pressure sensor, the outlet pressure fluctuation range can be precisely controlled to meet the needs of precision steam-using equipment. 2. Through the graded adjustment of the primary electric pressure reducing valve and the secondary electric pressure reducing valve, the primary electric pressure reducing valve handles the high pressure difference, and the secondary electric pressure reducing valve handles the low pressure difference. This can cover the changes in steam extraction flow rate over a wide range of unit load, thus ensuring stable regulation of both high and low pressure differences. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional enlarged structural diagram of the connection between the primary electric pressure reducing valve and the inlet pipe of this utility model. Figure 3 This is a three-dimensional enlarged structural diagram of the connection between the two-stage electric pressure reducing valve and the outlet pipe of this utility model; Figure 4 This is a three-dimensional enlarged structural diagram of the connection between the connecting pipe and the intermediate pressure sensor of this utility model.

[0012] In the diagram: 1. Base; 2. Primary electric pressure reducing valve; 3. Secondary electric pressure reducing valve; 4. Inlet pipe; 5. Connecting pipe; 6. Outlet pipe; 7. Inlet pressure sensor; 8. Intermediate pressure sensor; 9. Outlet pressure sensor; 10. Safety valve; 11. First flange connector; 12. Second flange connector; 13. Third flange connector; 14. Controller. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0014] Reference Figure 1-4 This embodiment discloses a steam extraction pressure reduction regulating device for a turbine unit. The device is installed on the steam extraction pipeline of the turbine unit and includes a base 1. The base 1 is provided with a pressure reduction component, a pipeline connection component and a monitoring and control component in sequence. Specifically, the pressure reducing assembly includes a primary electric pressure reducing valve 2 and a secondary electric pressure reducing valve 3, which are sequentially fixedly installed on the top outer wall of the base 1; the pipeline connection assembly includes an inlet pipe 4, a connecting pipe 5, and an outlet pipe 6. Specifically, the monitoring and control components include an inlet pressure sensor 7 installed on the inlet pipe 4 to monitor the initial pressure of the extracted steam, an intermediate pressure sensor 8 installed on the connecting pipe 5 to monitor the transition pressure after the first stage of pressure reduction, an outlet pressure sensor 9 installed on the outlet pipe 6 to monitor the final output pressure, and a controller 14 fixedly installed on the top outer wall of the base 1 for the execution control of the entire pressure reduction and regulation device. Furthermore, the first-stage electric pressure reducing valve 2 is a sleeve-type pressure reducing valve structure, used to quickly reduce high-pressure steam extraction to the medium-pressure range and reduce erosion wear under high pressure differential. The second-stage electric pressure reducing valve 3 is a pilot-operated diaphragm valve structure, used to further precisely adjust the medium-pressure steam to the target low pressure. Its valve core and valve seat are made of hard alloy overlay welding to improve erosion resistance. Furthermore, the inlet end of the first-stage electric pressure reducing valve 2 is connected to the inlet pipe 4 through the first flange connector 11, and both ends of the connecting pipe 5 are connected to the outlet end of the first-stage electric pressure reducing valve 2 and the inlet end of the second-stage electric pressure reducing valve 3 in sequence through the second flange connector 12. The outlet end of the second-stage electric pressure reducing valve 3 is connected to the outlet pipe 6 through the third flange connector 13. In this way, the use of various flange connectors facilitates maintenance and replacement. Furthermore, a safety valve 10 is installed on the outlet pipe 6. When the outlet pressure exceeds the safety threshold, the safety valve 10 can automatically release the pressure. The internal flow channels of the first-stage electric pressure reducing valve 2 and the second-stage electric pressure reducing valve 3 adopt a rounded transition design structure, which can reduce steam flow resistance and eddy current loss. Furthermore, the primary electric pressure reducing valve 2 and the secondary electric pressure reducing valve 3 are both electrically connected to the controller 14, and the inlet pressure sensor 7, the intermediate pressure sensor 8, and the outlet pressure sensor 9 are all electrically connected to the controller 14. In this way, the controller 14 will dynamically adjust the opening degree of the primary electric pressure reducing valve 2 and the secondary electric pressure reducing valve 3 according to the real-time signals of the inlet pressure sensor 7, the intermediate pressure sensor 8, and the outlet pressure sensor 9, so that the outlet pressure is stabilized within the set range.

[0015] The working principle of this embodiment is as follows: First, the controller 14 presets the target value of the outlet pressure according to the requirements of the steam-using equipment, and collects the feedback signal of the outlet pressure sensor 9 in real time; Second, when the outlet pressure deviates from the target value, the controller 14 first adjusts the opening of the secondary electric pressure reducing valve 3 for small-range fine adjustment; If the pressure requirement cannot be met even when the secondary electric pressure reducing valve 3 is fully open, the opening of the primary electric pressure reducing valve 2 is adjusted synchronously for large-range coarse adjustment; Finally, if the outlet pressure exceeds the safety threshold, the controller 14 immediately triggers the safety valve 10 to open and release pressure.

[0016] The contents not described in detail in this specification are prior art known to those skilled in the art. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A unit extraction steam pressure reducing and regulating device, comprising a base (1), characterized in that, The base (1) is provided with a pressure reducing component, a pipe connection component and a monitoring and control component in sequence; The pressure reducing assembly includes a first-stage electric pressure reducing valve (2) and a second-stage electric pressure reducing valve (3) that are fixedly installed on the top outer wall of the base (1) in sequence, and the pipeline connection assembly includes an inlet pipe (4), a connecting pipe (5) and an outlet pipe (6). The monitoring and control components include an inlet pressure sensor (7) installed on the inlet pipe (4), an intermediate pressure sensor (8) installed on the connecting pipe (5), an outlet pressure sensor (9) installed on the outlet pipe (6), and a controller (14) fixedly installed on the top outer wall of the base (1).

2. The unit extraction steam pressure reduction regulating device according to claim 1, characterized in that, The first-stage electric pressure reducing valve (2) is a sleeve-type pressure reducing valve structure, and the second-stage electric pressure reducing valve (3) is a pilot-operated diaphragm valve structure.

3. The unit extraction steam pressure reduction regulating device according to claim 1, characterized in that, The inlet end of the first-stage electric pressure reducing valve (2) is connected to the inlet pipe (4) through the first flange connector (11), and both ends of the connecting pipe (5) are connected to the outlet end of the first-stage electric pressure reducing valve (2) and the inlet end of the second-stage electric pressure reducing valve (3) through the second flange connector (12).

4. The unit extraction steam pressure reduction regulating device according to claim 1, characterized in that, The outlet end of the secondary electric pressure reducing valve (3) is connected to the outlet pipe (6) through the third flange connector (13), and a safety valve (10) is installed on the outlet pipe (6).

5. A unit extraction steam pressure reducing and regulating device according to claim 1, characterized in that, The first-stage electric pressure reducing valve (2) and the second-stage electric pressure reducing valve (3) are both electrically connected to the controller (14), and the inlet pressure sensor (7), the intermediate pressure sensor (8) and the outlet pressure sensor (9) are all electrically connected to the controller (14).

6. The unit extraction steam pressure reduction regulating device according to claim 1, characterized in that, The internal flow channels of the primary electric pressure reducing valve (2) and the secondary electric pressure reducing valve (3) adopt a circular arc transition design structure.

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