阅读说明：本技术 一种自力式喷水与电动喷水互补的蒸汽旁排系统 (Self-operated water spraying and electric water spraying complementary steam side-discharging system ) 是由 张旭阳 周振东 王晓奇 刘桃宏 刘忠诚 于 2021-08-26 设计创作，主要内容包括：本发明涉及一种自力式喷水与电动喷水互补的蒸汽旁排系统,补水机构由自力式压力调节阀与电动减温阀串联组成,所述自力式压力调节阀,用于常用补水,所述电动减温阀,用于备用补水。本发明采用自力式压力调节阀作为常用的补水手段,可以利用自力式压力调节阀自动进行压力调节的特性简化补水系统的控制系统,避免了仅采用电动减温阀可能产生的电磁兼容、压力温度探头失效、信号干扰、探头接触不良等多发故障,增加了系统的稳定性；采用电动减温阀作为备用的补水手段,采用传感器监控蒸汽管路的温度和压力等参数,对于特殊工况、故障工况具有更强的判断能力,可在自力式压力调节阀发生故障的情况下投入使用,增加了整个减温系统的可靠性。(The invention relates to a self-operated water spraying and electric water spraying complementary steam bypass system. The self-operated pressure regulating valve is used as a common water supplementing means, the control system of the water supplementing system can be simplified by utilizing the characteristic that the self-operated pressure regulating valve automatically regulates the pressure, the multiple faults of electromagnetic compatibility, pressure and temperature probe failure, signal interference, probe poor contact and the like which are possibly generated by only adopting the electric temperature reducing valve are avoided, and the stability of the system is improved; the electric desuperheating valve is used as a standby water supplementing means, the sensor is used for monitoring parameters such as temperature and pressure of the steam pipeline, the judgment capability for special working conditions and fault working conditions is stronger, the electric desuperheating valve can be put into use under the condition that the self-operated pressure regulating valve breaks down, and the reliability of the whole desuperheating system is improved.)

1. The utility model provides a formula of relying on oneself water spray and complementary other drainage system of steam of electronic water spray, includes moisturizing mechanism, its characterized in that: the water supplementing mechanism is formed by serially connecting a self-operated pressure regulating valve and an electric temperature reducing valve, the self-operated pressure regulating valve is used for supplementing water commonly used, and the electric temperature reducing valve is used for supplementing water for standby.

2. The self-operated water spray and electric water spray complementary steam by-pass system of claim 1, wherein: the self-operated pressure regulating valve and the electric temperature reducing valve form a group, and the sum of the outlet flow is the sum of the temperature reducing water flow of each stage.

3. The self-operated water spray and electric water spray complementary steam by-pass system of claim 1, wherein: the self-operated pressure regulating valve is composed of a regulating valve shell, a spring, a valve rod, a temperature reducing water inlet, a temperature reducing water outlet, a push rod and a control inlet, wherein the control inlet is connected with a steam pipeline through a signal pipe and used for automatically regulating the position of the valve rod through the pressure change of the steam pipeline so as to regulate the flow passing through the valve, when the pressure of the control inlet rises, the push rod pushes the valve rod to move upwards, the spring is compressed, and the flow passing through the valve rises along with the spring.

4. The self-operated water spray and electric water spray complementary steam by-pass system of claim 1, wherein: the self-operated pressure regulating valve is connected with the electric temperature reducing valve through a control box, and the control box is also connected with a pressure sensor in the signal pipe.

5. The self-operated water spray and electric water spray complementary steam by-pass system of claim 4, wherein: when the self-operated pressure regulating valve is jammed in a valve rod and insufficient in flow, and the pressure of the steam pipeline continuously rises, the control box receives an electric signal transmitted by the pressure sensor and exceeds a set value, and then outputs a control signal to the electric temperature reducing valve to enable the electric temperature reducing valve to be opened.

6. The self-operated water spray and electric water spray complementary steam by-pass system of claim 1, wherein: the inlet of the steam side-exhaust system with the complementation of self-operated water spraying and electric water spraying is connected with the steam inlet pipeline, and the outlet of the steam side-exhaust system with the complementation of self-operated water spraying and electric water spraying is connected with the throat part of the condenser, so that the installation of the steam side-exhaust system with the complementation of self-operated water spraying and electric water spraying is completed.

7. The self-operated water spray and electric water spray complementary steam by-pass system of claim 1, wherein: in the steam side-discharging system with the complementation of self-operated water spraying and electric water spraying, the side-discharged steam is decompressed through a pressure reducing valve and then passes through a first pressure reducing stage, a first stage self-operated pressure regulating valve, a first stage electric temperature reducing valve, a second pressure reducing stage, a second stage self-operated pressure regulating valve, a second stage electric temperature reducing valve and a third pressure reducing stage.

8. The self-operated water spray and electric water spray complementary steam by-pass system of claim 7, wherein: the pressure reducing valve, the first pressure reducing stage, the second pressure reducing stage and the third pressure reducing stage are pressure reducing structures.

9. The self-operated water spray and electric water spray complementary steam by-pass system of claim 7, wherein: the first stage self-operated pressure regulating valve, the first stage electric temperature reducing valve, the second stage self-operated pressure regulating valve and the second stage electric temperature reducing valve are of temperature reducing structures.

Technical Field

The invention relates to a marine steam turbine, in particular to a bypass system applicable to the marine steam turbine.

Background

The output working condition of the steam turbine in the marine environment changes more frequently, the steam consumption between the working conditions has larger difference, but the total steam consumption of the system required by the steam turbine changes less when the steam turbine changes the working condition. Therefore, a bypass system is required to absorb the excess working steam during the low power operation and shutdown of the steam turbine. Therefore, the structure is indispensable in the by-pass exhaust system type marine steam turbine generator unit.

The bypass structure generally comprises a pressure reducing structure and a temperature reducing structure. The temperature reducing structure is responsible for reducing the temperature of the by-pass steam after the pressure is reduced. Failure or imperfect desuperheating mechanism may result in excessive steam temperature entering the condenser, presenting greater challenges to the cooling capacity of the condenser and the stable operation of the steam turbine. Meanwhile, the temperature of the side exhaust pipe is too high, and heat radiation is carried out outwards. And the life health of workers around the pipeline and the normal operation of other equipment are threatened.

At present, the water supply of the temperature-reducing water of the bypass structure is carried out by adopting a single valve.

A conventional pressure and temperature reducing structure is shown in fig. 1. The structure comprises a pressure reducing valve, three pressure reducing stages and two temperature reducing valves. After the first pressure reduction stage and the second pressure reduction stage are both corresponding

The position of the temperature reducing valve is drawn as a manual valve, and the manual valve, the self-operated pressure regulating valve and the electric valve are adopted in actual use.

The high pressure steam is first depressurized through a pressure reducing valve and then secondarily depressurized through a first pressure reduction stage. The desuperheating water enters the pipeline through the valve, and is mixed with the steam after the first pressure reduction stage, so that the steam is desuperheated once. The steam is then discharged into the condenser throat after passing through a second pressure reduction stage, a second desuperheating valve and a third pressure reduction stage.

In the traditional structure of adopting three kinds of temperature reduction valves, such as a manual valve, a self-operated pressure regulating valve, an electric valve and the like, certain problems are respectively caused.

The manual valve can provide a fixed amount of desuperheating water for the pipeline, but cannot react to the change of the physical state of the high-pressure steam at the side discharge inlet.

The self-operated pressure regulating valve can regulate the water quantity of the pressure in the pipeline according to a designed program, but an operator has no method for automatically regulating the water quantity under the condition that the temperature-reduced water quantity needs to be increased under special working conditions in use. And the self-operated pressure regulating valve needs to be disassembled integrally for maintenance once encountering faults such as jamming of the valve rod and the like. This poses a risk to the long-term continuous stable operation of the entire unit.

The electric desuperheating valve can control the water quantity of the desuperheating water according to the measured values of the pressure probe and the temperature probe according to the setting of a program, and the water quantity of the desuperheating water can be freely controlled by an operator. However, the adopted actuating mechanism needs to maintain a constant power supply state when the unit runs, and extra power needs to be consumed. The adoption of the actuating mechanism also needs to consider the hidden troubles of electromagnetic compatibility, pressure and temperature probe failure, signal interference, poor probe contact and the like during the operation.

Disclosure of Invention

In order to make the supply of temperature-reducing water in the marine steam turbine bypass system more economical and safe, the invention provides a steam bypass system with complementary self-operated water spraying and electric water spraying.

In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides a formula of relying on oneself water spray and complementary other drainage system of steam of electronic water spray, includes moisturizing mechanism, moisturizing mechanism is established ties with electronic desuperheating valve by formula of relying on oneself pressure regulating valve and is constituteed, formula of relying on oneself pressure regulating valve for moisturizing commonly used, electronic desuperheating valve is used for reserve moisturizing.

Furthermore, a self-operated pressure regulating valve and an electric temperature reducing valve are combined into a group, and the sum of the outlet flow is the sum of the temperature reducing water flow of each stage.

Furthermore, formula of relying on oneself pressure regulating valve comprises governing valve casing, spring, valve rod, temperature reducing water inlet, temperature reducing water export, push rod and control entry, and wherein control entry passes through signal pipe connection steam pipe way for the position at valve rod place is independently adjusted and then the flow through the valve to pressure change through steam pipe way, and the push rod promotes the valve rod and moves upward when control entry pressure rises, and the spring is compressed, and the flow through the valve rises thereupon.

Furthermore, the self-operated pressure regulating valve is connected with the electric temperature reducing valve through a control box, and the control box is also connected with a pressure sensor of a signal pipe.

Further, when the self-operated pressure regulating valve is jammed in a valve rod and insufficient in flow, and the pressure of the steam pipeline continuously rises, the control box receives an electric signal transmitted by the pressure sensor and exceeds a set value, and then outputs a control signal to the electric temperature reducing valve to enable the electric temperature reducing valve to be opened.

Furthermore, the inlet of the steam side-exhaust system with the complementation of self-operated water spraying and electric water spraying is connected with the steam inlet pipeline, and the outlet of the steam side-exhaust system with the complementation of self-operated water spraying and electric water spraying is connected with the throat part of the condenser, so that the installation of the steam side-exhaust system with the complementation of self-operated water spraying and electric water spraying is completed.

Furthermore, in the steam side-discharging system with the complementation of self-operated water spraying and electric water spraying, the side-discharged steam is decompressed through a pressure reducing valve and then passes through a first pressure reducing stage, a first self-operated pressure regulating valve, a first electric temperature reducing valve, a second pressure reducing stage, a second self-operated pressure regulating valve, a second electric temperature reducing valve and a third pressure reducing stage.

Further, the pressure reducing valve, the first pressure reducing stage, the second pressure reducing stage and the third pressure reducing stage are pressure reducing structures.

Furthermore, the first stage self-operated pressure regulating valve, the first stage electric temperature reducing valve, the second stage self-operated pressure regulating valve and the second stage electric temperature reducing valve are temperature reducing structures.

The invention has the beneficial effects that:

the steam side-discharging system adopting self-operated water spraying and electric water spraying complementation has the following advantages:

1. the self-operated pressure regulating valve is used as a common water supplementing means, the control system of the water supplementing system can be simplified by utilizing the characteristic that the self-operated pressure regulating valve automatically regulates the pressure, the multiple faults of electromagnetic compatibility, pressure and temperature probe failure, signal interference, probe poor contact and the like which are possibly caused by only adopting the electric temperature reducing valve are avoided, and the stability of the system is improved.

2. The electric desuperheating valve is used as a standby water supplementing means, the temperature, the pressure and other parameters of the steam pipeline can be monitored by the sensor, and the electric desuperheating valve has stronger judgment capability on special working conditions and fault working conditions. The self-operated pressure regulating valve can be put into use under the condition that the self-operated pressure regulating valve fails, and the reliability of the whole temperature reducing system is improved.

The adoption of the system can ensure that the supply of the temperature-reducing water in the bypass exhaust system of the marine turbine is more economical and safer.

Drawings

FIG. 1 is a schematic structural diagram of a conventional pressure and temperature reducing device;

FIG. 2 is a diagram of a steam by-pass system of the present invention with complementary self-operated and electric water sprays;

FIG. 3 is a schematic structural view of a self-operated pressure regulating valve;

fig. 4 is a schematic view of the electric valve.

Detailed Description

The invention is further described with reference to the following figures and examples.

A self-operated water spraying and electric water spraying complementary steam bypass system is characterized in that a water supplementing mechanism is mainly formed by connecting a self-operated pressure regulating valve and an electric temperature reducing valve in series. The assembly positions of the respective sleeves are shown in detail in FIG. 2.

The side-discharge steam enters the side-discharge system from the left side, is firstly decompressed through a decompression valve 1, and then passes through a first decompression stage 2, a first-stage self-operated pressure regulating valve 3, a first-stage electric temperature reducing valve 4, a second decompression stage 5, a second-stage self-operated pressure regulating valve 6, a second-stage electric temperature reducing valve 7 and a third decompression stage 8.

Wherein the pressure reducing valve 1, the first pressure reducing stage 2, the second pressure reducing stage 5 and the third pressure reducing stage 8 are pressure reducing structures. The first stage self-operated pressure regulating valve 3, the first stage electric temperature reducing valve 4, the second stage self-operated pressure regulating valve 6 and the second stage electric temperature reducing valve 7 are temperature reducing structures.

The sum of the outlet flow of a self-operated pressure regulating valve and an electric temperature reducing valve as a group is the sum of the temperature reducing water flow of each stage. The self-operated pressure regulating valve can basically meet the requirements of most use conditions, and the self-operated characteristic can automatically regulate the inflow water quantity of the desuperheating water under the condition of no external electric signal input. The electric temperature-reducing valve is used as a control means for additional remote control and special working conditions, and is kept in a standby state during normal operation. If the self-operated pressure regulating valve has the situations of valve rod jamming, insufficient flow and the like, the pressure of the steam pipeline can be continuously increased. And after the electric signal transmitted by the sensor exceeds a certain value, the electric temperature-reducing valve is opened. When the special working condition needs to be remotely controlled, the actuator can be remotely controlled by the control box to adjust the amount of the desuperheating water.

The structure adopts a self-operated pressure regulating valve as a main control means in daily use. By using the mode, the steam state change in the pipeline can be quickly responded, and the overhigh temperature of the side exhaust steam flow caused by the delay of water spray possibly caused by only adopting the electric temperature-reducing valve is avoided.

Moreover, the structure avoids the multiple faults of electromagnetic compatibility, pressure temperature probe failure, signal interference, probe poor contact and the like which are possibly generated by only adopting the electric temperature-reducing valve, and the stability of the system is improved. Under the fault working condition of the self-operated pressure regulating valve, the electric temperature reducing valve can be used as a standby means. The electric desuperheating valve can receive pressure and temperature signals through the sensor and is controlled by using a fault diagnosis program, and judgment capacity on special working conditions and fault working conditions is stronger.

The two valves are mutually standby, so that the whole reliability of the whole temperature reduction system is stronger.

As shown in fig. 3, the self-operated pressure regulating valve mainly comprises a regulating valve housing 11, a spring 12, a valve rod 13, a temperature-reduced water inlet 14, a temperature-reduced water outlet 15, a push rod 16 and a control inlet (17). Wherein the control inlet 17 is connected to the steam line via a signal line.

The self-operated pressure regulating valve has the main function that the position of the valve rod can be automatically regulated through the pressure change of the steam pipeline, and then the flow passing through the valve is regulated. When the control inlet pressure rises, the push rod pushes the valve rod to move upwards, the spring is compressed, and the flow passing through the valve rises along with the compression.

As shown in fig. 4, the electric desuperheating valve adopts a conventional valve structure. The device mainly comprises an actuator 21, a valve rod 22, a shell 23, a temperature-reduced water inlet 24 and a temperature-reduced water outlet 25. The primary function of an electrically operated desuperheater valve is to control the movement of the valve stem position through an actuator and thus control the flow through the valve.

The pressure reducing valve, the pressure reducing stage, the self-operated pressure regulating valve, the electric temperature reducing valve, the connecting pipeline and other sleeves are independently produced, processed and connected. The control inlet of the self-operated pressure regulating valve is connected to the steam pipeline, and the electric temperature reducing valve is connected with the control box and the power supply. The inlet of the system is connected with the steam inlet pipeline, and the outlet of the system is connected with the throat part of the condenser, so that the installation of the steam side-discharging system with complementary self-operated water spraying and electric water spraying can be completed.