A regulating valve for a steam turbine for regulating the admission of steam

Abstract

This invention discloses a turbine regulating valve for regulating and controlling the replenished steam at the steam inlet. It can control not only the flow rate of the main steam pipeline but also the replenished steam at the steam inlet. It includes: a regulating valve body; a regulating valve cover; a main regulating valve seat, which is fixedly installed within the valve mounting section of the regulating valve body; a main regulating valve core, whose displacement controls the on / off state and flow rate of the main steam; a steam inlet connecting flange, which is fixedly installed on the steam outlet of the regulating valve body and has a main channel and a replenished steam channel; a replenished steam inlet regulating valve core, which cooperates with the steam inlet connecting flange and controls the opening and closing of the replenished steam channel through displacement; a regulating valve rod, on which the main regulating valve core and the replenished steam inlet regulating valve core are sleeved; and a servo pump electro-hydraulic control system, which is poweredly connected to the regulating valve rod.

Description

Technical Field

[0001] This invention relates to the field of steam turbine technology, and in particular to a steam turbine regulating valve for regulating and controlling the replenishment of steam at the steam inlet. Background Technology

[0002] Existing steam turbine inlet makeup steam refers to setting up a channel before the first-stage nozzle to supplement steam, thereby regulating system parameters such as pressure, temperature, and flow rate, or optimizing operating conditions. The makeup steam channel is generally located in a bypass pipeline before or after the main steam valve, introduced as a separate steam source before the first-stage nozzle. This method requires a separate valve for controlling the makeup steam, separate pipe warm-up, and a condensate drain device to prevent droplets from corroding the blades. There is a risk of insufficient condensate draining or incomplete pipe warm-up; it increases operational complexity, makes control difficult, and hinders rapid makeup steam generation; furthermore, the added valves and pipelines increase the risk of leakage and energy loss. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a turbine regulating valve for regulating and controlling the supplementary steam at the steam inlet. It can not only control and regulate the flow rate of the main steam pipeline, but also control the supplementary steam at the steam inlet. It has the advantages of regulating both main steam and supplementary steam, is simple to control, and reduces the risk of leakage and energy loss.

[0004] The objective of this invention is achieved as follows: A turbine regulating valve for regulating and controlling the supplementary steam at the steam inlet includes: The regulating valve body has an L-shaped channel through which the main steam passes. One end of the L-shaped channel is the valve mounting section, the downstream end of the valve mounting section is the steam outlet, and the upstream end of the other end of the L-shaped channel is the steam inlet. The regulating valve cover is fixed to the upstream end of the valve installation section and forms a seal on the L-shaped channel; The main regulating valve seat is fixedly installed in the valve mounting section of the regulating valve body. The main regulating valve core is engaged with the main regulating valve seat hole shaft, and the displacement of the main regulating valve core controls the on / off state and flow rate of the main steam. The steam inlet connection flange is fixedly installed on the steam outlet of the regulating valve body. The steam inlet connection flange has a main channel and a make-up steam channel. The main channel is connected to the steam outlet of the regulating valve body, and the main steam enters the steam turbine through the main channel. The valve core of the make-up steam inlet regulating valve is matched with the steam inlet connection flange, and the opening and closing of the make-up steam channel is controlled by displacement. The regulating valve rod, the main regulating valve core, and the supplementary steam inlet regulating valve core are sleeved on the regulating valve rod. The regulating valve rod is used to synchronously drive the main regulating valve core and the supplementary steam inlet regulating valve core. The servo pump electro-hydraulic control system is poweredly connected to the regulating valve lever and is used to control the displacement of the regulating valve lever.

[0005] Preferably, a regulating valve seal is provided between the regulating valve cover and the regulating valve rod.

[0006] Preferably, the steam inlet connecting flange has an annular outlet, and the outlet of the steam inlet connecting flange is divided into an independent outlet section one and an outlet section two, which are respectively connected to the main channel and the supplementary steam channel.

[0007] Preferably, the steam inlet connection flange includes an outer cylinder, a cone is provided at the axial position of the outer cylinder, the outlet of the steam inlet connection flange is arranged around the cone, the inner end of the cone is provided with a middle inner hole, the middle inner hole is connected to the outlet, the valve core of the steam inlet regulating valve is fitted in the middle inner hole of the cone, the valve core of the steam inlet regulating valve can be axially displaced in the inner hole of the cone, when the outward displacement of the steam inlet regulating valve core exceeds the design value A, a gap is formed between the steam inlet regulating valve core and the middle inner hole; In the closed state, the valve core and valve seat of the main regulating valve are sealed together, and the valve core and inner hole of the steam inlet regulating valve are sealed together. No steam passes through the main passage and the steam inlet passage. When the main steam is open, the displacement of the main regulating valve core required for the main steam to open is less than the outward displacement of the regulating valve rod, which is less than the design value A. A gap is formed between the main regulating valve core and the main regulating valve seat. The main steam enters the turbine through the main channel of the steam inlet connection flange. The valve core of the make-up steam regulating valve and the inner hole of the cone are still sealed. No steam passes through the make-up steam channel. When the supplementary steam is open, the outward displacement of the regulating valve rod is greater than or equal to the design value A. A gap is formed between the valve core and the inner hole of the supplementary steam inlet regulating valve, the supplementary steam channel is opened, the main steam enters the turbine through the main channel of the steam inlet connecting flange, and the supplementary steam enters the turbine through the supplementary steam channel of the steam inlet connecting flange.

[0008] Preferably, by adjusting the ratio of the valve core of the supplementary steam inlet regulating valve to the first and second sections of the steam inlet connection flange outlet, different supplementary steam requirements and steam inlet degree designs can be met, and various parameter design requirements can be addressed.

[0009] Due to the adoption of the above technical solution, the present invention has the following beneficial effects: 1. Throughout the entire control process, the regulating valve lever is driven only by the servo pump electro-hydraulic control system, which in turn drives the main regulating valve core and the supplementary steam inlet regulating valve core. The operation is simple and convenient, and the control accuracy is high.

[0010] 2. The main regulating and steam replenishment are integrated into one structure, eliminating the need for additional valves and pipelines, and eliminating the need for reheating and draining before steam replenishment, thus avoiding leakage risks and energy loss.

[0011] 3. When the steam flow rate increases, the large flow rate of steam under non-rated operating conditions can be used to improve efficiency. 4. Adapts to steam volume regulation under varying operating conditions, ensuring stable output; 5. Good adjustment performance. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the turbine regulating valve in the closed state. Figure 3 This is a schematic diagram of the outlet section of the steam inlet connection flange.

[0013] Figure Labels In the attached diagram: 1. Control valve body; 2. Control valve cover; 3. Control valve seal; 4. Servo pump electro-hydraulic control system; 5. Control valve lever; 6. Main control valve core; 7. Main control valve seat; 8. Steam inlet connection flange; 9. Makeup steam inlet control valve core. Detailed Implementation

[0014] A turbine regulating valve for regulating and controlling the supplementary steam at the steam inlet includes: a regulating valve body 1, which has an L-shaped channel through which main steam passes; one section of the L-shaped channel is a valve mounting section, the downstream end of which is a steam outlet, and the upstream end of the other section of the L-shaped channel is a steam inlet; a regulating valve cover 2, which is fixedly sealed to the upstream end of the valve mounting section and forms a seal on the L-shaped channel; a main regulating valve seat 7, which is fixedly installed in the valve mounting section of the regulating valve body 1; a main regulating valve core 6, which is mortised and axially fitted with the main regulating valve seat 7, and the displacement of the main regulating valve core 6 controls the on / off state and flow rate of the main steam; and a steam inlet connecting flange 8, which is fixedly mounted. Installed on the steam outlet of the regulating valve body 1, the steam inlet connecting flange 8 has a main channel and a supplementary steam channel. The supplementary steam channel is used to increase the steam outlet diameter of the main steam. The main channel is connected to the steam outlet of the regulating valve body 1, and the main steam enters the steam turbine through the main channel. The supplementary steam inlet regulating valve core 9 cooperates with the steam inlet connecting flange 8 and controls the opening and closing of the supplementary steam channel by displacement. The regulating valve rod 5 is fitted with the main regulating valve core 6 and the supplementary steam inlet regulating valve core 9. The regulating valve rod 5 is used to synchronously drive the main regulating valve core 6 and the supplementary steam inlet regulating valve core 9. The servo pump electro-hydraulic control system 4 is poweredly connected to the regulating valve rod 5 and is used to control the displacement of the regulating valve rod 5.

[0015] A regulating valve seal 3 is provided between the regulating valve cover 2 and the regulating valve rod 5. The steam inlet connecting flange 8 has an annular outlet, and the outlet of the steam inlet connecting flange 8 is divided into an independent outlet section 1 and outlet section 2, which are respectively connected to the main channel and the make-up steam channel.

[0016] The steam inlet connection flange 8 includes an outer cylinder, and a cone is provided at the axial position of the outer cylinder. The outer cylinder and the cone are connected by a connecting plate and form a flow gap. The outlet of the steam inlet connection flange 8 is arranged around the cone. The inner end of the cone is provided with a middle inner hole, which is connected to the outlet section. The steam inlet regulating valve core 9 is fitted in the middle inner hole of the cone. The steam inlet regulating valve core 9 can be axially displaced in the inner hole of the cone. When the outward displacement of the steam inlet regulating valve core 9 exceeds the design value A, a gap is formed between the steam inlet regulating valve core 9 and the middle inner hole. In the closed state, the valve core 6 and the valve seat 7 of the main regulating valve are sealed together, and the valve core 9 and the inner hole of the cone of the steam inlet regulating valve are sealed together. No steam passes through the main passage and the steam inlet passage. When the main steam is in the open state, the displacement of the main regulating valve core 6 required for the main steam to open is less than the outward displacement of the regulating valve rod 5 and less than the design value A. A gap is formed between the main regulating valve core 6 and the main regulating valve seat 7. The main steam enters the turbine through the main channel of the steam inlet connection flange 8. The steam inlet regulating valve core 9 and the inner hole of the cone are still sealed. No steam passes through the steam inlet channel. When the supplementary steam is open, the outward displacement of the regulating valve rod 5 is greater than or equal to the design value A. A gap is formed between the valve core 9 of the supplementary steam inlet regulating valve and the inner hole of the cone body. The supplementary steam channel is open, and the main steam enters the turbine through the main channel of the steam inlet connecting flange 8. The supplementary steam enters the turbine through the supplementary steam channel of the steam inlet connecting flange 8.

[0017] By designing and adjusting the ratio of the valve core to the first and second sections of the steam inlet flange outlet, different steam replenishment requirements and steam inlet degree designs can be met, addressing various parameter design requirements. This can be used for steam inlet degree design, and the size of the valve core 9 also needs to be adjusted according to its proportion.

[0018] Specifically: A turbine regulating valve for controlling the supplementary steam at the steam inlet includes a main regulating valve and a supplementary steam inlet regulating valve. The main regulating valve and the supplementary steam inlet regulating valve share a set of regulating valves. The regulating valve is provided with a regulating valve body, a regulating valve cover, a regulating valve seal, a servo pump electro-hydraulic control system, a regulating valve rod, a main regulating valve core, a main regulating valve seat, a steam inlet connection flange, and a supplementary steam inlet regulating valve core.

[0019] The regulating valve body serves as a support and pressure-bearing component, connected to the regulating valve cover, and has an inlet and an outlet. The regulating valve is sealed and installed in the inner hole of the regulating valve cover. The servo pump electro-hydraulic control system is located outside the regulating valve body, supported on the regulating valve cover, and connected to the regulating valve lever. The regulating valve lever passes through the regulating valve cover and the inner hole of the regulating valve seal, connecting the main regulating valve core and the supplementary steam inlet regulating valve core. The main regulating valve seat is installed inside the regulating valve body, with its inner hole fitting with the outer circle of the main regulating valve core. When closed, it is in a surface-fitting sealing state, isolating the regulating valve valve body. The valve body has a steam inlet and an outlet; the steam inlet of the steam inlet connecting flange is connected to the steam outlet of the regulating valve body; the outlet of the steam inlet connecting flange is divided into two independent steam outlets, one of which is directly connected to the outlet of the regulating valve body, and the other of which is connected to the outer circle of the steam replenishment regulating valve core through the middle inner hole. When the steam replenishment regulating valve core moves outward a certain distance, a gap appears at the position of the valve core and the steam inlet connecting flange, and the two outlets are connected; by adjusting the ratio of the steam replenishment regulating valve core to the first and second outlets of the steam inlet connecting flange, different steam replenishment needs and partial steam inlet design can be met, and various parameter design requirements can be addressed.

[0020] When steam enters through the steam inlet of the regulating valve body, the servo pump electro-hydraulic control system adjusts the position of the regulating valve lever, causing the valve core of the main regulating valve and the valve core of the supplementary steam inlet regulating valve to move, opening and increasing the gap between the valve core of the main regulating valve and the valve seat of the main regulating valve, allowing steam to enter. The valve cover of the regulating valve and the regulating valve seal to prevent steam from flowing to the outside; and enter the steam turbine from one outlet section of the steam inlet connecting flange; when the distance moved by the regulating valve lever is small, the two outlet sections of the steam inlet connecting flange are still sealed; as the distance increases, when the design value A is reached, a gap appears between the steam inlet connecting flange and the valve core of the supplementary steam inlet regulating valve, and the two outlet sections of the steam inlet connecting flange open, thereby achieving the effect of supplementary steam.

[0021] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A turbine regulating valve for adjusting and controlling the supplementary steam at the steam inlet, characterized in that, include: The regulating valve body has an L-shaped channel through which the main steam passes. One end of the L-shaped channel is the valve mounting section, the downstream end of the valve mounting section is the steam outlet, and the upstream end of the other end of the L-shaped channel is the steam inlet. The regulating valve cover is fixed to the upstream end of the valve installation section and forms a seal on the L-shaped channel; The main regulating valve seat is fixedly installed in the valve mounting section of the regulating valve body. The main regulating valve core is engaged with the main regulating valve seat hole shaft, and the displacement of the main regulating valve core controls the on / off state and flow rate of the main steam. The steam inlet connection flange is fixedly installed on the steam outlet of the regulating valve body. The steam inlet connection flange has a main channel and a make-up steam channel. The main channel is connected to the steam outlet of the regulating valve body, and the main steam enters the steam turbine through the main channel. The valve core of the make-up steam inlet regulating valve is matched with the steam inlet connection flange, and the opening and closing of the make-up steam channel is controlled by displacement. The regulating valve rod, the main regulating valve core, and the supplementary steam inlet regulating valve core are sleeved on the regulating valve rod. The regulating valve rod is used to synchronously drive the main regulating valve core and the supplementary steam inlet regulating valve core. The servo pump electro-hydraulic control system is poweredly connected to the regulating valve lever and is used to control the displacement of the regulating valve lever.

2. The turbine regulating valve for adjusting and controlling the supplementary steam at the steam inlet according to claim 1, characterized in that: A regulating valve seal is provided between the regulating valve cover and the regulating valve rod.

3. A turbine regulating valve for adjusting and controlling the supplementary steam at the steam inlet according to claim 1, characterized in that: The steam inlet connection flange has an annular outlet, and the outlet of the steam inlet connection flange is divided into an independent outlet section one and an outlet section two. The outlet section one and the outlet section two are respectively connected to the main channel and the supplementary steam channel.

4. A turbine regulating valve for adjusting and controlling the supplementary steam at the steam inlet according to claim 3, characterized in that: The steam inlet connection flange includes an outer cylinder, a cone is provided at the axial position of the outer cylinder, the outlet of the steam inlet connection flange is arranged around the cone, the inner end of the cone is provided with a middle inner hole, the middle inner hole is connected to the outlet section, the steam inlet regulating valve core is fitted in the middle inner hole of the cone, the steam inlet regulating valve core can be axially displaced in the inner hole of the cone, when the outward displacement of the steam inlet regulating valve core exceeds the design value A, a gap is formed between the steam inlet regulating valve core and the middle inner hole; In the closed state, the valve core and valve seat of the main regulating valve are sealed together, and the valve core and inner hole of the steam inlet regulating valve are sealed together. No steam passes through the main passage and the steam inlet passage. When the main steam is open, the displacement of the main regulating valve core required for the main steam to open is less than the outward displacement of the regulating valve rod, which is less than the design value A. A gap is formed between the main regulating valve core and the main regulating valve seat. The main steam enters the turbine through the main channel of the steam inlet connection flange. The valve core of the make-up steam regulating valve and the inner hole of the cone are still sealed. No steam passes through the make-up steam channel. When the supplementary steam is open, the outward displacement of the regulating valve rod is greater than or equal to the design value A. A gap is formed between the valve core and the inner hole of the supplementary steam inlet regulating valve, the supplementary steam channel is opened, the main steam enters the turbine through the main channel of the steam inlet connecting flange, and the supplementary steam enters the turbine through the supplementary steam channel of the steam inlet connecting flange.

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