Passive control micro-superheated steam pressure adjusting device

Abstract

The invention relates to the technical field of fluid machinery, in particular to a passive control micro-superheated steam pressure adjusting device. The device comprises an inlet pipeline, a quick-closing valve, a pilot-operated pulse safety valve, an outlet pipeline, a shunt pipe and various valves, a main path of the shunting pipe is connected with a quick-closing valve, the quick-closing valve is connected with an outlet pipeline, the outlet pipeline is provided with a stop valve for an external device and a pilot-operated pulse safety valve, and upper and lower cavities of the safety valve are connected with the upper and lower ends of a valve seat of the quick-closing valve through bypass pipelines. The device can adjust the steam mixing proportion to adapt to parameter requirements, and multi-user independent steam supply is achieved; the safety valve is in passive linkage with the quick-closing valve, steam is quickly cut off and pressure is reduced during overpressure, automatic re-supply is achieved after the pressure is recovered, and external power and manual intervention are not needed. Continuous and stable steam supply is guaranteed, the reliability and response speed of the system are improved, and the method is suitable for ship boiler steam systems.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid machinery, in particular to a passive controlled micro-superheated steam pressure regulating device. BACKGROUND

[0002] In the ship power system, the boiler as the core steam generating equipment, the steam produced is mainly divided into two categories: superheated steam and saturated steam. The pressure and temperature parameters of these two types of steam need to match the operation requirements of auxiliary equipment of the power system, such as desuperheating and pressure reducing device, daily fuel oil steam heater, steam turbine fuel pump, etc., in order to ensure the stable operation of the entire power system. However, in order to meet the core power demand of the ship, the initial pressure and temperature of the output steam of the main boiler are usually much higher than the tolerance range of the auxiliary equipment. If the high-parameter steam without treatment is directly introduced into the auxiliary equipment, not only will the internal components of the equipment deform or performance degrade due to overpressure and overtemperature, but also will accelerate the aging of the sealing and the corrosion of the pipeline, seriously shorten the service life of the auxiliary equipment, and even cause the equipment to start and stop failure, affecting the overall reliability of the ship power system.

[0003] At the same time, the operating environment of the ship steam system has particularity: on the one hand, during the ship navigation process, load fluctuations such as speed changes and equipment start-stop switching will cause the boiler steam output to be unstable, thereby causing the steam pressure in the pipeline to fluctuate instantaneously; on the other hand, after long-term operation of the system, the steam pressure regulating valve may have a decrease in regulating accuracy due to valve core wear, seal failure, etc., or even a stuck fault, causing the pipeline pressure to abnormally rise. If the abnormal pressure situation cannot be responded in time, the high steam pressure will cause the system to be in an overload state, not only causing equipment damage, but also possibly posing a threat to the safety of the crew.

[0004] Currently, the solutions for "parameter adaptation" and "pressure protection" in the ship steam system are mostly designed in a decentralized manner: on the one hand, the steam parameters are reduced by independent desuperheating and pressure reducing devices, and the adapted steam is then transported to each auxiliary equipment through separate pipelines. This method requires the laying of a large number of additional pipelines, which not only increases the system complexity and space occupation, but also increases the installation and maintenance costs; on the other hand, pressure protection mainly relies on a single safety valve. When the pressure exceeds the limit, the safety valve opens to discharge excess steam to reduce the pressure. However, this process has a slow response speed, and the steam source cannot be cut off. If the pressure regulating valve fails at the same time, it is difficult to quickly reduce the pressure to a safe range by relying on the safety valve to discharge, and there is a risk of not timely protection. In summary, the existing technology lacks an integrated device that can simultaneously achieve "accurate steam parameter regulation" and "rapid pressure abnormality protection", and it is difficult to meet the high reliability and high integration requirements of modern ship steam systems. SUMMARY

[0005] In order to solve the technical problem that the high parameter superheated steam output by the main boiler and the saturated steam cannot be directly matched with the demand of the auxiliary equipment of the power system in the steam system of the ship boiler, the application provides a passive controlled micro superheated steam pressure regulating device.

[0006] To this end, the application provides the following technical solutions: The passive controlled micro superheated steam pressure regulating device comprises an inlet pipeline, a quick closing valve, a pilot operated pulse safety valve and an outlet pipeline; a saturated steam inlet gate valve and an auxiliary superheated steam inlet gate valve are installed on the inlet pipeline, and the outlet ends of the respective inlet pipelines are respectively connected to different branch interfaces of the same shunt pipe; the main road outlet end after the confluence of the shunt pipe is connected to the inlet end of the quick closing valve, and the outlet end of the quick closing valve is connected to the inlet end of the outlet pipeline; a stop valve for connecting with external devices and the pilot operated pulse safety valve are installed on the outlet pipeline; the upper cavity of the pilot operated pulse safety valve is connected to the lower end interface of the valve seat of the quick closing valve through a bypass pipeline, and the lower cavity of the pilot operated pulse safety valve is connected to the upper end interface of the valve seat of the quick closing valve through a bypass pipeline.

[0007] Further, a pressure regulating valve is installed on the outlet pipeline.

[0008] Further, a steam outlet stop valve to a desuperheating and pressure reducing device, a steam outlet stop valve to a daily fuel oil steam heater and a steam outlet stop valve to a steam turbine fuel oil pump are installed on the outlet pipeline.

[0009] Further, a total outlet stop valve is installed on the outlet end of the outlet pipeline.

[0010] Further, a drain port is arranged on the shunt pipe and the outlet pipeline.

[0011] Further, a temperature sensor joint, a temperature table joint, a pressure table joint and a pressure sensor joint are installed on the outlet pipeline.

[0012] The application has the following advantages and positive effects: The device is connected to the saturated steam and the auxiliary superheated steam through independent inlet pipelines, and the entering proportion of the two types of steam can be flexibly adjusted by matching the corresponding inlet gate valves; then the mixed steam is obtained through the same shunt pipe, so that the parameter demand of the subsequent micro superheated steam can be accurately matched; meanwhile, the special stop valves are arranged on the outlet pipeline for different external devices, so that the independent steam supply control of each user equipment can be realized, the diversified steam demand of the auxiliary equipment of the power system can be matched, and the influence of the single road steam supply fault on the overall system is avoided.

[0013] The pilot type pulse safety valve and the quick closing valve form a passive linkage structure driven by pressure difference through a bypass pipeline, without external electrical or hydraulic power: when the outlet pipeline pressure exceeds the limit, the pilot type pulse safety valve jumps, and the pressure difference formed between the upper and lower chambers directly acts on the valve seat of the quick closing valve, quickly driving the quick closing valve to close to cut off the steam source, compared with the traditional single safety valve which only discharges pressure reduction, the pressure can be more efficiently suppressed from rising continuously; and when the pressure recovers, the pressure difference disappears after the safety valve resets, and the quick closing valve can automatically open to restore the steam supply, the entire protection process does not require manual intervention, and the reliability and response speed are greatly improved.

[0014] The steam mixing ratio can be adjusted through the inlet gate valve to control the initial state of the mixed steam from the source, laying a foundation for subsequent stable steam supply; and the linkage protection of the quick closing valve and the safety valve can effectively prevent the outlet pipeline from overpressure, prevent external devices from being damaged or performance degradation due to overpressure, and the installation of the stop valve on the outlet pipeline can realize the independent on-off of different user equipment, that is, even if a user end fails, the corresponding stop valve can be closed for maintenance, without affecting the steam supply of other lines, ensuring the continuity and stability of the entire system steam supply. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0016] Figure 1 A structure schematic view of a passive control micro-superheated steam pressure regulating device provided by the present application.

[0017] Figure 2 A structure schematic view of an inlet pipeline of a passive control micro-superheated steam pressure regulating device provided by the present application.

[0018] Figure 3 A structure schematic view of an outlet pipeline of a passive control micro-superheated steam pressure regulating device provided by the present application.

[0019] Figure 4 A cross-sectional view of a passive control part structure in a normal working state of a passive control micro-superheated steam pressure regulating device provided by the present application.

[0020] Figure 5 A cross-sectional view of a passive control part structure in a high pressure working state of a passive control micro-superheated steam pressure regulating device provided by the present application.

[0021] Figure 6The sectional view of the pilot type pulse safety valve in the high pressure working state of the passive control micro-superheated steam pressure regulating device provided by the present application.

[0022] Figure 7 The sectional view of the passive control part structure after the quick closing valve is closed in the passive control micro-superheated steam pressure regulating device provided by the present application.

[0023] In the figure: 1, steam inlet gate valve; 2, steam outlet stop valve to desuperheating and pressure reducing device; 3, steam outlet stop valve to daily fuel oil steam heater; 4, steam outlet stop valve to steam turbine fuel pump; 5, total outlet stop valve; 6, quick closing valve; 7, pilot type pulse safety valve; 8, inlet pipeline; 9, outlet pipeline; 10, pressure regulating valve; 11, drain port; 12, auxiliary superheated steam inlet gate valve; 13, shunt pipe; 14, bypass pipeline; 15, temperature sensor joint; 16, temperature table joint; 17, pressure table joint; 18, pressure sensor joint. DETAILED DESCRIPTION

[0024] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0025] The present application provides a passive control micro-superheated steam pressure regulating device, as shown in the figure, comprising an inlet pipeline 8, a quick closing valve 6, a pilot type pulse safety valve 7 and an outlet pipeline 9; a saturated steam inlet gate valve 1 and an auxiliary superheated steam inlet gate valve 12 are installed on the inlet pipeline 8, and the outlet ends of the respective inlet pipelines 8 are respectively connected to different shunt interfaces of the same shunt pipe 13, and the shunt pipe 13 is provided with a drain port 11. Figures 1-2

[0026] As shown in the figure, the main road outlet end after the shunt pipe 13 converges is connected with the inlet end of the quick closing valve 6, the outlet end of the quick closing valve 6 is connected with the inlet end of the pressure regulating valve 10, the outlet end of the pressure regulating valve 10 is connected with the inlet end of the outlet pipeline 9, and the outlet pipeline 9 is sequentially provided with the steam outlet stop valve 2 to the desuperheating and pressure reducing device, the steam outlet stop valve 3 to the daily fuel oil steam heater, the steam outlet stop valve 4 to the steam turbine fuel pump and the pilot type pulse safety valve 7. The outlet pipeline 9 is provided with a drain port 11. Figure 3

[0027] As shown in the figure, the main road outlet end after the shunt pipe 13 converges is connected with the inlet end of the quick closing valve 6, the outlet end of the quick closing valve 6 is connected with the inlet end of the pressure regulating valve 10, the outlet end of the pressure regulating valve 10 is connected with the inlet end of the outlet pipeline 9, and the outlet pipeline 9 is sequentially provided with the steam outlet stop valve 2 to the desuperheating and pressure reducing device, the steam outlet stop valve 3 to the daily fuel oil steam heater, the steam outlet stop valve 4 to the steam turbine fuel pump and the pilot type pulse safety valve 7. The outlet pipeline 9 is provided with a drain port 11. Figure 4 ​​As shown, the upper chamber of the pilot-operated pulse safety valve 7 is connected to the lower end of the valve seat of the quick-closing valve 6 through a bypass pipeline 14, and the lower chamber of the pilot-operated pulse safety valve 7 is connected to the upper end of the valve seat of the quick-closing valve 6 through a bypass pipeline 14.

[0028] A temperature sensor joint 15, a temperature gauge joint 16, a pressure gauge joint 17, and a pressure sensor joint 18 are installed on the outlet pipeline 9. The outlet end of the outlet pipeline 9 is provided with a total outlet stop valve 5.

[0029] Working principle: The saturated steam generated by the main boiler enters the device through the saturated steam inlet gate valve 1 on the inlet pipeline 8, and the superheated steam enters the device through the auxiliary superheated steam inlet gate valve 12 on the same group of inlet pipelines 8. By adjusting the opening degree of the two inlet gate valves, the proportion of the saturated steam and the superheated steam entering can be controlled. The two streams of steam pass through the outlet end of the inlet pipeline 8 and are connected to different branch interfaces of the shunt pipe 13, respectively, and the preliminary mixing is completed in the shunt pipe 13. At the same time, the drain 11 provided on the shunt pipe 13 can timely drain the condensate generated during the mixing process, avoiding the retention of condensate causing water hammer or affecting the steam parameters.

[0030] The mixed steam after converging in the shunt pipe 13 enters the quick-closing valve 6 through the main outlet end. Under normal working conditions, the quick-closing valve 6 remains open, and the mixed steam flows smoothly into the inlet end of the pressure regulating valve 10. The pressure regulating valve 10 automatically adjusts the opening degree of the valve core according to the preset pressure value of the outlet pipeline 9: when the outlet pressure is higher than the preset value, the valve core is closed to reduce the steam flow and reduce the pressure; when the outlet pressure is lower than the preset value, the valve core is opened to increase the steam flow and increase the pressure, so that the mixed steam is finally adjusted to micro-superheated steam with appropriate pressure.

[0031] The micro-superheated steam after pressure regulation enters the outlet pipeline 9, and according to the needs of different auxiliary equipment of the power system, it is transported to the corresponding equipment through the pipeline on the outlet pipeline 9 to the desuperheating and pressure reducing device outlet stop valve 2, the daily oil steam heater outlet stop valve 3, and the steam turbine oil pump steam supply outlet stop valve 4. The drain 11 on the outlet pipeline 9 can drain the condensate generated during the steam transportation process to ensure the steam supply quality, and finally the unshunted steam is output through the total outlet stop valve 5.

[0032] When the pressure regulating valve 10 fails or the system load suddenly changes, causing the steam pressure in the outlet pipeline 9 to exceed the preset safety value, such as Figures 5-6As shown, the pilot impulse safety valve 7 reaches the take-off pressure, the valve disc opens, at this time the upper chamber and the lower chamber of the safety valve form a pressure difference through the internal flow channel. The pressure difference is transmitted to the quick closing valve 6 through the bypass pipeline 14: the safety valve upper chamber pressure acts on the lower end of the quick closing valve 6 valve seat through the bypass pipeline 14, and the safety valve lower chamber pressure acts on the upper end of the quick closing valve 6 valve seat through another bypass pipeline 14, so that the pressure at the upper end of the quick closing valve 6 valve seat is greater than that at the lower end, driving the valve seat to move downward to the closed state, cutting off the steam supply from the shunt pipe 13 to the pressure regulating valve 10, as shown in FIG. 2. Figure 7 As shown, the pressure of the outlet pipeline 9 is rapidly reduced. Figures 5-7 The dark color in the middle inlet pipeline 8 and the outlet pipeline 9 represents high pressure, and the light color represents reduced pressure.

[0033] When the steam pressure in the outlet pipeline 9 is reduced to the preset reset pressure, the valve disc of the pilot impulse safety valve 7 resets, the upper and lower chamber pressures of the pilot impulse safety valve 7 are balanced, and the upper and lower end pressures of the quick closing valve 6 valve seat are also balanced; at this time, the quick closing valve 6 valve seat moves upward under the action of the top spring tension, reopens the steam passage, and the mixed steam enters the pressure regulating valve 10 again, and the device returns to the normal regulation and steam supply state.

[0034] The temperature sensor joint 15 installed on the outlet pipeline 9 is connected to the temperature sensor, the temperature table joint 16 is connected to the field temperature table, the pressure table joint 17 is connected to the field pressure table, and the pressure sensor joint 18 is connected to the pressure sensor, so that the temperature and pressure parameters of the outlet slightly superheated steam can be collected in real time; on the one hand, the system state can be directly observed by the operator through the field instruments; on the other hand, the parameter signals are transmitted to the control system through the sensors, which provides a basis for the opening regulation of the pressure regulating valve 10, and at the same time, the action state of the pilot impulse safety valve 7 is monitored to ensure that the device operating parameters are stable and controllable.

[0035] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A passively controlled microsuperheat steam pressure regulating device, characterized by, It includes import pipeline (8), quick closing valve (6), pilot pulse safety valve (7) and export pipeline (9); The import pipeline (8) is installed saturated steam import gate valve (1) and auxiliary superheated steam import gate valve (12), the export end of each import pipeline (8) is connected to the different branch interfaces of the same shunt pipe (13) respectively, the main road export end after the confluence of shunt pipe (13) is connected with the inlet end of quick closing valve (6), the export end of quick closing valve (6) is connected with the inlet end of export pipeline (9), the export pipeline (9) is installed for the cut-off valve of connecting with external device and pilot pulse safety valve (7);The upper chamber of pilot pulse safety valve (7) is connected with the lower end interface of quick closing valve (6) valve seat through a bypass pipeline (14), the lower chamber of pilot pulse safety valve (7) is connected with the upper end interface of quick closing valve (6) valve seat through a bypass pipeline (14).

2. A passively controlled microsuperheat steam pressure regulating device according to claim 1, wherein, The export pipeline (9) is installed pressure regulating valve (10).

3. A passively controlled microsuperheat vapor pressure modulation device according to claim 1, wherein, The export pipeline (9) is installed to the steam outlet cut-off valve (2) of temperature reducing and pressure reducing device, to the daily use fuel oil steam heater export cut-off valve (3) and to the steam turbine fuel oil pump steam supply outlet cut-off valve (4).

4. A passively controlled microsuperheat vapor pressure modulation device according to claim 1, wherein, The export end of export pipeline (9) is installed total export cut-off valve (5).

5. A passively controlled microsuperheat vapor pressure modulation device according to claim 1, wherein, The shunt pipe (13) and export pipeline (9) are all provided with drain (11).

6. A passively controlled microsuperheat vapor pressure modulation device according to claim 1, wherein, The export pipeline (9) is installed temperature sensor connector (15), temperature table connector (16), pressure gauge connector (17) and pressure sensor connector (18).

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