Adjusting combination valve for peak regulation of nuclear power unit

Abstract

The invention relates to a regulating combination valve, in particular to a regulating combination valve for peak regulation of a nuclear power unit. The problems that when an existing adjusting combined valve is used, pipeline arrangement is complex, and consequently the combined valve is inconvenient to overhaul in the service process are solved. A valve body is provided with a main steam valve, a first adjusting valve and a second adjusting valve which are arranged in sequence. The main steam valve, the first adjusting valve and the second adjusting valve each comprise a valve deck, a valve seat, a valve rod and a valve butterfly. The first adjusting valve and the second adjusting valve are communicated through the steam outlet end of the steam channel main steam valve, and the steam outlet end of the second adjusting valve is communicated with the steam outlet end of the first adjusting valve through a pipeline. During use, the pipeline arrangement is simpler and more reasonable, convenience is brought to follow-up overhaul and maintenance work, meanwhile, the number of the steam inlets in the cylinder is reduced to one, and convenience is brought to design or machining of the cylinder. The invention belongs to the technical field of adjusting combined valves.

Description

Technical Field

[0001] The invention relates to a regulating combined valve, in particular to a regulating combined valve for peak regulation of a nuclear power unit, and belongs to the technical field of regulating combined valves. Background Art

[0002] At present, only French nuclear power units have directly participated in peak load regulation, and although they have daily peak load regulation capabilities, they try to maintain base load operation for economic and safety reasons. Nuclear power units in the United States, Japan, South Korea, Canada, and Spain generally do not participate in peak load regulation, and only participate in seasonal peak load regulation of the power grid through overhaul.

[0003] Under the new energy situation in China, the development of the national economy and the improvement of people's living standards have led to a greater difference in the peak and valley of power grid operation. At the same time, the number of nuclear power units put into operation has increased year by year, and the share of power generation has increased day by day. Therefore, the pressure of peak-shaving operation is also increasing, and nuclear power units are beginning to need long-term low-load operation to participate in power grid peak-shaving. At present, the nuclear power units put into operation in China have not participated in long-term peak-shaving operation, and lack practical experience or evaluation system for reference. The same situation also exists in the newly put into operation CPR1000 and other units in recent years.

[0004] If you want nuclear power units to participate in peak load regulation, you need a large-caliber valve that can meet the needs of long-term low-load operation, and only a combined valve with one main steam valve + two steam regulating valves has peak load regulation capability. The existing combined valve with one main and two regulating valves has two steam outlets, and the two steam outlets are respectively connected to the cylinder. This connection makes the pipeline layout between the combined valve and the cylinder complicated, and the cylinder also needs to be designed with two steam inlets, which makes it inconvenient to maintain the combined valve during service.

[0005] In summary, how to propose a regulating combined valve for peak load regulation of nuclear power units in response to the above technical problems has become an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention provides a regulating combined valve for peak regulation of a nuclear power unit.

[0007] The technical solution of the present invention is: a regulating combined valve for peak regulation of nuclear power units, comprising a valve body, in which a steam channel for steam circulation is opened.

[0008] The valve body comprises a main steam valve, a first regulating valve and a second regulating valve which are arranged in sequence; the main steam valve, the first regulating valve and the second regulating valve all comprise a valve cover, a valve seat, a valve stem and a valve butterfly.

[0009] The valve seat is installed in the valve body, and the outer surface of the valve seat is clad with nickel-based alloy.

[0010] The valve cover is installed on the valve body, the valve stem passes through the valve cover and is fixedly connected to the valve butterfly, and the valve butterfly abuts against the valve seat.

[0011] The first regulating valve and the second regulating valve are both communicated with each other through the steam outlet end of the main steam valve of the steam passage, and the steam outlet end of the second regulating valve is communicated with the steam outlet end of the first regulating valve through a pipeline.

[0012] Compared with the prior art, the present invention has the following effects:

[0013] 1. The steam outlet end of the second regulating valve 130 of the present invention is connected to the steam outlet end of the first regulating valve 120 through a pipeline, and the steam outlet end of the first regulating valve 120 is connected to the cylinder, so that the pipeline layout is more concise and reasonable, which brings convenience to subsequent inspection and maintenance work. At the same time, the number of steam inlets on the cylinder is reduced to 1, which brings convenience to the design or processing of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is an axonometric view of the present invention;

[0015] Figure 2 is a cross-sectional view of the present invention;

[0016] Figure 3 is a cross-sectional view of the valve body 100 of the present invention;

[0017] Figure 4 is a first schematic diagram of the present invention when in use;

[0018] Figure 5 It is a second schematic diagram when the present invention is used.

[0019] In the figure: 100, valve body; 110, main steam valve; 120, first regulating valve; 130, second regulating valve. DETAILED DESCRIPTION

[0020] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0021] Specific implementation method 1: Combination Figures 1 to 5 The present embodiment is described as a regulating combined valve for peak regulation of a nuclear power unit, comprising a valve body 100, wherein a steam passage for steam circulation is provided in the valve body 100; the valve body 100 is made of low alloy heat-resistant steel.

[0022] Preferably, the valve body 100 is made of ZG15Cr1Mo1V.

[0023] The valve body 100 has a main steam valve 110 , a first regulating valve 120 and a second regulating valve 130 arranged in sequence. The main steam valve 110 , the first regulating valve 120 and the second regulating valve 130 each include a valve cover, a valve seat, a valve stem and a valve butterfly.

[0024] The valve seat is installed in the valve body 100, and the outer surface of the valve seat is welded with a nickel-based alloy.

[0025] Preferably, the material of the nickel-based alloy is ERNiCrCoMo-1, which improves the durability and reliability of the present invention.

[0026] The valve cover is installed on the valve body 100, the valve stem passes through the valve cover and is fixed to the valve butterfly, and the valve stem is fixed to the valve actuator to realize the opening or closing of the main steam valve 110, the first regulating valve 120 or the second regulating valve 130, and the valve butterfly is against the valve seat.

[0027] The first regulating valve 120 and the second regulating valve 130 are both connected through the steam outlet end of the main steam valve 110 of the steam passage. The main steam is introduced into the steam inlet end of the main steam valve 110, and the steam outlet end of the second regulating valve 130 is connected to the steam outlet end of the first regulating valve 120 through a pipeline.

[0028] Specific implementation method 2: Combination Figures 1 to 5 Description of the Present Embodiment The present embodiment is described. In the present embodiment, the throat diameter of the valve seat in the main steam valve 110 is 300 mm.

[0029] Furthermore, the throat diameter of the valve seat in the first regulating valve 120 is 270 mm.

[0030] Furthermore, the throat diameter of the valve seat in the second regulating valve 130 is 116 mm.

[0031] Other components and connection relationships are the same as those in the first specific implementation method.

[0032] Example

[0033] The present invention will be further described below with reference to the accompanying drawings:

[0034] Combination Figures 1 to 5 To illustrate this embodiment, a nuclear power CX project has a large amount of steam and requires the unit to enter long-term peak load operation after commissioning operation at 10% of the rated reactor power for two months.

[0035] During the commissioning process, the unit operating parameters are low (steam inlet parameters 13.24MPa, 535℃), and the high-temperature gas-cooled reactor is continuously operating at a low load of 10%. Currently, there is no regulating combined valve with simple installation and more reasonable pipeline layout.

[0036] The present invention is adopted to solve the above problems. The present invention is used in pairs and symmetrically installed on both sides of the cylinder axis.

[0037] In the present invention, the main steam is introduced into the steam inlet of the main steam valve 110, the steam outlet of the first regulating valve 120 is connected to the cylinder, and the steam outlet of the first regulating valve 120 is arranged parallel to the horizontal plane to ensure that the steam enters the cylinder horizontally and tangentially.

[0038] The first regulating valve 120 and the second regulating valve 130 are used to adjust the steam intake of the cylinder to control the output of the unit:

[0039] When the unit is operated at low load during the commissioning operation, the first regulating valve 120 is closed and the opening degree of the second regulating valve 130 is above 30%.

[0040] After the commissioning operation is completed, the unit load increases. When the load reaches 34% of the rated stack power, the second regulating valve 130 is fully opened, and then the first regulating valve 120 is gradually opened. The opening of the first regulating valve 120 increases with the increase of the load, and at the same time, the second regulating valve 130 is gradually closed.

[0041] When the load reaches 84% ​​of the rated stack power, the second regulating valve 130 is reopened, and when the load reaches 100% of the rated stack power, the openings of the first regulating valve 120 and the second regulating valve 130 remain fully open.

[0042] In this embodiment, the first regulating valve 120 and the second regulating valve 130 are switched to ensure that the present invention can serve stably in the debugging operation condition, and the first regulating valve 120 and the second regulating valve 130 are fully opened to ensure that the present invention can serve stably in the long-term peak-shaving operation condition.

[0043] How it works

[0044] Combination Figures 1 to 5 The working principle of the present invention is described:

[0045] A steam passage for steam circulation is opened in the valve body 100 , and the valve body 100 has a main steam valve 110 , a first regulating valve 120 , and a second regulating valve 130 arranged in sequence.

[0046] The first regulating valve 120 and the second regulating valve 130 are both connected through the steam outlet end of the main steam valve 110 of the steam channel. The main steam is introduced into the steam inlet end of the main steam valve 110. The steam outlet end of the second regulating valve 130 is connected to the steam outlet end of the first regulating valve 120 through a pipeline. The steam outlet end of the first regulating valve 120 is connected to the cylinder.

[0047] The present invention has been disclosed as above in the form of a preferred embodiment, but it is not intended to limit the present invention. Any simple modification, equivalent changes and modifications made to the above implementation cases by any professional and technical personnel who do not deviate from the content of the technical solution of the present invention and based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A regulating combined valve for peak regulation of nuclear power units, characterized in that: The valve body (100) comprises a steam passage for steam to flow; The valve body (100) has a main steam valve (110), a first regulating valve (120) and a second regulating valve (130) which are arranged in sequence; The main steam valve (110), the first regulating valve (120) and the second regulating valve (130) each include a valve cover, a valve seat, a valve stem and a valve butterfly; The valve seat is installed in the valve body (100), and the outer surface of the valve seat is welded with a nickel-based alloy; The valve cover is mounted on the valve body (100), the valve stem passes through the valve cover and is fixedly connected to the valve butterfly, and the valve butterfly abuts against the valve seat; The first regulating valve (120) and the second regulating valve (130) are both connected via the steam outlet end of the steam channel main steam valve (110), and the steam outlet end of the second regulating valve (130) is connected to the steam outlet end of the first regulating valve (120) via a pipeline.

2. A regulating combined valve for peak regulation of a nuclear power unit according to claim 1, characterized in that: The valve body (100) is made of low alloy heat-resistant steel.

3. A regulating combined valve for peak regulation of a nuclear power unit according to claim 2, characterized in that: The material of the valve body (100) is ZG15Cr1Mo1V.

4. A regulating combined valve for peak regulation of a nuclear power unit according to claim 1, characterized in that: The material of the nickel-based alloy is ERNiCrCoMo-1.

5. A regulating combined valve for peak regulation of a nuclear power unit according to claim 1, characterized in that: The throat diameter of the valve seat in the main steam valve (110) is 300 mm.

6. A regulating combined valve for peak regulation of a nuclear power unit according to claim 1, characterized in that: The throat diameter of the valve seat in the first regulating valve (120) is 270 mm.

7. A regulating combined valve for peak regulation of a nuclear power unit according to claim 1, characterized in that: The throat diameter of the valve seat in the second regulating valve (130) is 116 mm.

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