Air source structure of large differential pressure valve

Abstract

The utility model belongs to the technical field of tower type hot salt pipe photo-thermal power stations, and particularly relates to an air source structure of a large differential pressure valve, which comprises an air inlet source, an air storage tank, a branch pipeline, a ball valve, a filter, a large differential pressure main path regulating valve positioner, a large differential pressure bypass regulating valve positioner, a large differential pressure main path regulating valve amplifier and a large differential pressure bypass regulating valve amplifier. The air storage tank is additionally arranged, so that the provided air source pressure and air flow are stable, reliable and abundant; two valve gas source pipelines are independently separated, a control gas source and a power gas source are also independently separated, and the response requirements of valve opening and closing speed are met by adjusting coordination and matching of bypass valve control gas path flow and improving the sensitivity of an amplifier to signal change. And vibration of a descending pipe system of the heat absorber caused by back-and-forth fluctuation of the pain-creating valve is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of tower-type hot salt tube solar thermal power stations, in particular to a gas source structure of a large differential pressure valve. Background Art

[0002] The molten salt absorption system at the Gonghe CSP power station primarily consists of steel structures, molten salt absorbers, inlet / outlet buffer tanks, instrumentation and valves, electric heat tracing, and piping. These include the upper tower cold salt pipe, the lower tower hot salt pipe, the absorber panel connecting pipes, the salt drainage pipe, the exhaust pipe, and the overflow pipe. The molten salt absorber and piping are suspended from the tower's top steel structure. The outlet buffer tank is installed between 219.8 and 226.3 meters. The high-pressure differential valve on the absorber's lower salt pipe connects between the outlet tank and the cold and hot salt tanks, forming a crucial component of the absorber system. Since the installation of the high-pressure differential main and bypass regulating valves on the absorber's lower salt pipe, valves have frequently experienced valve jamming, back-and-forth fluctuations, inability to maintain stable feedback, and slow feedback tracking. These valve jamming and fluctuations have been particularly severe after the system's hot absorber has been loaded with salt.

[0003] The control air source and power air source of the main and bypass regulating valves of the large differential pressure valve share a common air source pipe. When the two valves are adjusted and used, due to the thin pipe diameter and small air volume, and the elastic fatigue of the internal diaphragm of the air source amplifier after long-term use, the working capacity decreases, the air pressure cannot be maintained, and the power is insufficient, resulting in the phenomenon of slow valve switching or sliding of the hot valve; due to the vibration of the pipeline in the tower, the air source pipeline will also be affected by the vibration, which will affect the unstable control air source pressure of the pneumatic actuator, coupled with the valve fluctuation, the common air source of the main and bypass valves will interfere with each other and increase the impact, aggravating the vibration to form a vicious circle.

[0004] Frequent jamming and sliding of the large differential pressure regulating valve in the downcomer of the heat absorber will cause the liquid level in the outlet tank of the heat absorber to be uncontrollable, and there is a risk of overflow and leakage of molten salt in the outlet tank of the heat absorber, posing a threat to the safety of personnel and equipment; in addition, the back-and-forth fluctuation of the valve will cause and aggravate the vibration of the downcomer system of the heat absorber, increase the supporting load of the pipe supports and hangers, and pose a risk of cracking of the pipe welds, seriously threatening the safe and stable operation of the heat absorber system. If an accident occurs, it will cause huge economic losses to the enterprise; for this reason, the present application proposes a gas source structure for a large differential pressure valve. Utility Model Content

[0005] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and in the abstract and title of the utility model to avoid obscuring the purpose of this section, the abstract and the title of the utility model, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0006] In view of the above problems and / or the problems existing in the gas source structure of the existing large differential pressure valve, the present utility model is proposed.

[0007] Therefore, the purpose of this utility model is to provide an air source structure for a large differential pressure valve, with an additional air storage tank installed to ensure that the air source pressure and air flow provided are stable, reliable, and sufficient; the air source pipelines of the two valves are separated independently, and the control air source and the power air source are also separated independently. By adjusting the bypass valve to control the coordination and matching of the air path flow and improve the sensitivity of the amplifier to signal changes, the response requirements of the valve opening and closing speed are met, and the vibration caused by the back-and-forth fluctuation of the painful valve and the aggravation of the heat absorber downpipe system are reduced. To solve the above technical problems, according to one aspect of the utility model, the utility model provides the following technical solutions:

[0008] A gas source structure for a large differential pressure valve, comprising:

[0009] An air intake source, an air storage tank, a branch pipeline, a ball valve, a filter, a large pressure difference main regulating valve positioner, a large pressure difference bypass regulating valve positioner, a large pressure difference main regulating valve amplifier and a large pressure difference bypass regulating valve amplifier. The air intake source is connected to the air storage tank, and the air storage tank is connected to the branch pipeline. A ball valve and a filter are arranged on the branch pipeline. The ends of the branch pipelines are respectively connected to the large pressure difference bypass regulating valve positioner, the large pressure difference main regulating valve amplifier and the large pressure difference bypass regulating valve amplifier.

[0010] As a preferred solution of the air source structure of a large differential pressure valve described in the utility model, electric heating is provided on the connecting pipelines among the air inlet source, air storage tank, branch pipeline, ball valve, filter, large differential pressure main regulating valve positioner, large differential pressure bypass regulating valve positioner, large differential pressure main regulating valve amplifier and large differential pressure bypass regulating valve amplifier.

[0011] As a preferred solution of the gas source structure of the large differential pressure valve described in the present invention, the gas storage tank is provided with a gas storage tank pressure gauge, a safety valve and a drain valve.

[0012] Compared with the existing technology: the utility model is equipped with an air storage tank to ensure that the air source pressure and air flow provided are stable, reliable and abundant; the air source pipelines of the two valves are separated independently, and the control air source and the power air source are also separated independently. By adjusting the bypass valve to control the coordinated matching of the air path flow and improve the sensitivity of the amplifier to signal changes, the response requirements of the valve opening and closing speed are met, and the vibration caused by the back-and-forth fluctuation of the painful valve and the aggravation of the vibration of the heat absorber downpipe system are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive labor. Among them:

[0014] Figure 1 This is a schematic diagram of the structural connection of the utility model.

[0015] In the figure: 100 air intake source, 200 air storage tank, 300 branch pipeline, 400 ball valve, 500 filter, 600 large pressure differential main regulating valve positioner, 700 large pressure differential bypass regulating valve positioner, 800 large pressure differential main regulating valve amplifier, 900 large pressure differential bypass regulating valve amplifier. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0017] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0018] Next, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, cross-sectional views of device structures may be partially enlarged and not to scale when describing the embodiments of the present invention. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0020] The utility model provides an air source structure for a large differential pressure valve, with an additional air storage tank installed to ensure that the air source pressure and air flow provided are stable, reliable and sufficient; the air source pipelines of the two valves are separated independently, and the control air source and the power air source are also separated independently. By adjusting the bypass valve to control the coordination and matching of the air path flow and improve the sensitivity of the amplifier to signal changes, the response requirements of the valve opening and closing speed are met, and the vibration caused by the back and forth fluctuation of the painful valve and the aggravation of the heat absorber downpipe system are reduced. Please refer to Figure 1, including: an air intake source 100, an air storage tank 200, a branch pipeline 300, a ball valve 400, a filter 500, a large pressure difference main regulating valve positioner 600, a large pressure difference bypass regulating valve positioner 700, a large pressure difference main regulating valve amplifier 800 and a large pressure difference bypass regulating valve amplifier 900.

[0021] The air intake source 100 is connected to the air storage tank 200, which is connected to the branch pipeline 300. The branch pipeline 300 is provided with a ball valve 400 and a filter 500. The ends of the branch pipeline 300 are respectively connected to the large pressure difference bypass regulating valve positioner 700, the large pressure difference main regulating valve amplifier 800 and the large pressure difference bypass regulating valve amplifier 900;

[0022] Among them, the end of the branch pipeline 300 is connected to the main line and bypass regulating valve, the main line and bypass regulating valve have two pipe openings respectively, the large pressure difference main regulating valve positioner 600 and the large pressure difference main regulating valve amplifier 800 are installed on the large pressure difference main regulating valve, and the large pressure difference bypass regulating valve positioner 700 and the large pressure difference bypass regulating valve amplifier 900 are installed on the large pressure difference bypass regulating valve.

[0023] A new gas storage tank 200 is installed on the original pipeline to ensure that the gas source pressure and air flow are stable, reliable and sufficient.

[0024] Modify the main and bypass valve regulating gas sources of the downpipe behind the gas tank 200, separate the two valve gas source pipelines, and also separate the control gas source and the power gas source. Adjust the regulating gas source pressure to 0.6MPa to meet the positioner's gas source pressure requirements; restore the power gas source pipe diameter to φ25mm, and adjust the gas source pressure to 0.8-1MPa to meet the actuator's supply pressure requirements.

[0025] Add air filter 500 to the gas source pipeline to ensure the quality of the gas source.

[0026] Replace the gas source amplifier, adjust the bypass valve to control the coordination and matching of gas flow, and improve the sensitivity of the amplifier to signal changes to meet the response requirements of valve opening and closing speed and maintain dynamic stability.

[0027] Add electric heating to pipelines, valves and valve stems, standardize the installation process of insulation materials, and ensure that the preheating temperature of pipelines and valves meets technical requirements.

[0028] When in use, an air storage tank is installed to ensure that the air source pressure and air flow provided are stable, reliable and sufficient, thereby reducing the fluctuation of the valve. The air source pipelines of the two valves (main line and bypass regulating valve) are separated independently, and the control air source and the power air source are also separated independently. The original single pipeline is separated to form a branch pipeline 300, which is convenient for separate regulation and maintenance, avoids the mutual influence of vibration between pipelines, reduces the vibration caused by the back and forth fluctuation of the valve and aggravates the vibration of the heat absorber downpipe system, and eliminates the risk of deformation of pipeline supports and cracks in pipeline welds.

[0029] While the present invention has been described above with reference to specific embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, as long as no structural conflicts exist, the various features of the embodiments disclosed herein may be combined with one another in any manner, and the omission of an exhaustive description of these combinations in this specification is solely for the sake of space and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A gas source structure for a large differential pressure valve, characterized in that: include: An air intake source (100), an air storage tank (200), a branch pipeline (300), a ball valve (400), a filter (500), a large pressure difference main line regulating valve positioner (600), a large pressure difference bypass regulating valve positioner (700), a large pressure difference main line regulating valve amplifier (800), and a large pressure difference bypass regulating valve amplifier (900); the air intake source (100) is connected to the air storage tank (200); the air storage tank (200) is connected to the branch pipeline (300); the ball valve (400) and the filter (500) are both provided on the branch pipeline (300); and the ends of the branch pipeline (300) are respectively connected to the large pressure difference bypass regulating valve positioner (700), the large pressure difference main line regulating valve amplifier (800), and the large pressure difference bypass regulating valve amplifier (900).

2. The air source structure of a large differential pressure valve according to claim 1, characterized in that: Electric heating is provided on the connecting pipelines between the air inlet source (100), the air storage tank (200), the branch pipeline (300), the ball valve (400), the filter (500), the large pressure difference main regulating valve positioner (600), the large pressure difference bypass regulating valve positioner (700), the large pressure difference main regulating valve amplifier (800) and the large pressure difference bypass regulating valve amplifier (900).

3. The air source structure of a large differential pressure valve according to claim 1, characterized in that: The gas storage tank (200) is provided with a gas storage tank pressure gauge, a safety valve and a sewage valve.

Images