CN216671209U - 600 MW-level multi-module high-temperature reactor start-stop reactor system - Google Patents

Abstract

The utility model relates to the technical field of reactor starting and stopping, in particular to a 600 MW-level multi-module high-temperature reactor starting and stopping system which comprises a plurality of steam generators, a steam turbine, a condenser and a reactor starting and stopping capacity expander, wherein each steam generator is connected to a main steam main pipe through a main steam pipeline and then enters the steam turbine in two ways; a start-stop reactor pipeline is led out of a main steam pipeline of each steam generator and is connected to a start-stop reactor flash tank; each steam generator leads out a main steam bypass pipeline after leading out a start-stop reactor pipeline and is connected to the steam condenser, and each main steam bypass pipeline is provided with a bypass regulating valve. The number of the steam-water separators is reduced by arranging the shared start-stop reactor flash tank; the flash tank for starting and stopping the reactor is arranged on the side of the condenser, and because the pressure is lower and the wall thickness is thinner, a special cooling or heat-insulating system is not needed, the system is simple, and the occupied area is small; the main steam bypass valve is arranged in a single pile and is led out from the main steam pipeline, and the control logic is simpler and more definite.

Description

600 MW-level multi-module high-temperature reactor start-stop system

Technical Field

The utility model relates to the technical field of start-stop reactors, in particular to a 600 MW-level multi-module high-temperature reactor start-stop system.

Background

The high-temperature gas cooled reactor nuclear island adopts a modular design, the power generation power corresponding to each nuclear island module is 100MW grade, so that a 200MW demonstration reactor has 2 reactor modules, and in order to improve the power generation efficiency and reduce the unit power unit manufacturing cost, a 600MW grade high-temperature reactor technology of 6 modules needs to be developed.

Because the nuclear island steam generator is started at a constant pressure, in the process of starting or stopping the nuclear island, the main steam pressure at the outlet of the steam generator needs to be constant at a rated operation value, the flow rate is 36kg/s, the medium temperature is 150-571 ℃, and the nuclear island steam generator is subjected to a super-cooling, saturation and overheating state. In order to prevent water from entering a steam turbine and recover working media as much as possible in the startup and shutdown stage, a startup and shutdown system is required to be arranged on the side of the conventional island secondary loop, namely a main steam large bypass is established, and media are recovered in the stage of supercooling water, saturated water and saturated steam during startup or shutdown.

A set of independent pile starting and stopping system is correspondingly arranged for each pile of the original 200MW demonstration pile, the system comprises an inlet adjusting valve, a pile starting and stopping steam-water separator, a steam discharging and draining pipeline and a valve, a steam-water separator cooling and heat insulation pipeline and the like, and the system is complex.

For a 600MW demonstration pile, if the original 200MW demonstration pile is adopted to be configured with a set of independent start-stop pile system, 6 piles need to be configured with 6 sets or 3 sets of start-stop pile steam-water separators, and the main defects are as follows:

(1)6 piles need to be provided with 6 sets of pile steam-water separators for starting and stopping, related rapid cooling and heat preservation systems, complex systems, higher construction cost and large occupied area.

(2) The corresponding steam-water separator needs to be kept warm and standby when a single pile normally operates, and needs to be cooled quickly when the pile is stopped so as to match the temperature when the pile is started, and the operation flow is complex.

(3) The main steam bypass valve is led out from the main steam pipe, participates in medium discharge and pressure control at the initial stage of stack overheating starting and stopping, the original accident working condition main steam discharge function is superposed, the main steam bypass valve has more working conditions and is more complex to control.

SUMMERY OF THE UTILITY MODEL

The utility model solves the problems that a 600MW demonstration reactor needs to be provided with a plurality of steam-water separators in the prior art, the system is complex, the engineering cost is higher, the occupied area is large, the operation flow is complex, the working conditions of a main steam bypass valve are more, and the control is more complex, and provides a 600 MW-level multi-module high-temperature reactor start-stop reactor system which is provided with a shared start-stop reactor flash tank and reduces the number of the steam-water separators; the flash tank for starting and stopping the reactor is arranged on the side of the condenser, and because the pressure is lower and the wall thickness is thinner, a special cooling or heat-insulating system is not needed, the system is simple, and the occupied area is small; the bypass regulating valve is arranged in a single pile and is led out from the main steam pipeline, and the control logic is simple and clear.

In order to solve the technical problems, the utility model is realized by the following technical scheme: a600 MW-level multi-module high-temperature reactor start-stop reactor system comprises a plurality of steam generators, a steam turbine, condensers and a start-stop reactor flash tank, wherein each steam generator is connected to a main steam main pipe through a main steam pipeline and then enters the steam turbine in two ways; a start-stop reactor pipeline is led out of a main steam pipeline of each steam generator and is connected to a start-stop reactor flash tank; each steam generator leads out a main steam bypass pipeline after leading out a start-stop reactor pipeline and is connected to the steam condenser, and each main steam bypass pipeline is provided with a bypass regulating valve.

Preferably, the number of the steam generators is 6, and the number of the steam generators is a first steam generator, a second steam generator, a third steam generator, a fourth steam generator, a fifth steam generator and a sixth steam generator.

Preferably, each main steam pipeline between the start-stop reactor pipeline and the main steam bypass pipeline is provided with a first isolation valve, and each main steam pipeline between the main steam bypass pipeline and the main steam main pipe is provided with a second isolation valve.

Preferably, a third isolation valve and a main steam valve are arranged on the two main steam main pipes.

As a preferred scheme, each start-stop pipeline is provided with a fourth isolation valve and a start-stop regulating valve.

Compared with the prior art, the utility model has the beneficial effects that:

1) the start-stop reactor adopts a shared flash tank form, so that the complexity of a start-stop reactor system is reduced;

2) the startup and shutdown are more flexible, the startup and shutdown working conditions of a plurality of piles can be borne once, and the startup and shutdown working conditions are not influenced;

3) the pressure of the start-stop reactor flash tank is reduced, the wall thickness of the flash tank is reduced, the adaptability to temperature change is enhanced, a cooling and heat-preserving system is not required to be specially arranged, and the configuration and operation of the start-stop reactor system are simpler;

4) the flash tank for starting and stopping the reactor is arranged on the side of the condenser, and because the pressure is lower and the wall thickness is thinner, and the flash tank is connected with the condenser by utilizing an exhaust and drain pipeline, a special cooling or heat preservation system is not needed, the system is simple, and the occupied area is small;

5) the bypass regulating valve is arranged in a single pile mode, and the control of the bypass regulating valve is clear and simple;

6) the switching point of the medium pipeline is switched before the pile adjusting valve is started or stopped, so that the problem of arrangement of pipelines behind the valve is solved;

7) and a steam-water separator is omitted, and the steam generator is directly flushed with an outlet medium, so that the system is simpler.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

In the figure:

101. the first steam generator, 102, the second steam generator, 103, the third steam generator, 104, the fourth steam generator, 105, the fifth steam generator, 106, the sixth steam generator, 11, the main steam pipeline, 111, the first isolating valve, 112, the second isolating valve, 12, the main steam main pipe, 121, the third isolating valve, 122, the main steam valve, 13, open and stop the heap pipeline, 131, the fourth isolating valve, 132, open and stop the heap governing valve, 14, main steam bypass pipeline, 141, the bypass governing valve, 2, the steam turbine, 3, the condenser, 4, open and stop the heap flash tank.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

As shown in fig. 1, a 600 MW-grade multi-module high-temperature reactor start-stop system comprises a plurality of steam generators, a steam turbine 2, a condenser 3 and a start-stop reactor flash tank 4, wherein each steam generator is connected to a main steam main pipe 12 through a main steam pipeline 11 and then enters the steam turbine 2 in two ways; a reactor starting and stopping pipeline 13 is led out of a main steam pipeline 11 of each steam generator and is connected to the reactor starting and stopping flash tank 4; each steam generator draws out the main steam bypass pipeline 14 again after drawing out the start-stop pile pipeline 13 and is connected to the condenser 3, and each main steam bypass pipeline 14 is provided with a bypass regulating valve 141.

In one embodiment, there are 6 steam generators, a first steam generator 101, a second steam generator 102, a third steam generator 103, a fourth steam generator 104, a fifth steam generator 105, and a sixth steam generator 105.

In one embodiment, a first isolation valve 111 is disposed on each main steam pipe 11 between the start-stop stack pipe 13 and the main steam bypass pipe 14, and a second isolation valve 112 is disposed on each main steam pipe 11 between the main steam bypass pipe 14 and the main steam main pipe 12.

In one embodiment, a third isolation valve 121 and a main steam valve 122 are disposed on the two main steam main pipes 12.

In one embodiment, each start-stop stack pipe 13 is provided with a fourth isolation valve 131 and a start-stop stack regulating valve 132.

In the utility model, a start-stop reactor steam-water separator is omitted, and supercooled water, saturated steam and the like in the early stage of the start-up stage enter a start-stop reactor flash tank 4 beside a condenser 3 through a start-stop reactor pipeline 13 led out from a main steam pipeline 11.

Meanwhile, in order to solve the problems of vibration and the like after the valve adjusting pipeline is arranged at the inlet of the start-stop reactor flash tank 4, the start-stop reactor adjusting valve 132 should be arranged as close to the start-stop reactor flash tank 4 as possible, the corresponding pipe diameter is large due to low pressure after the valve, and the arrangement of the pipeline after the valve is difficult if a switching pipeline is arranged, so that a medium switching point is adjusted to be in front of the start-stop reactor adjusting valve 132, and the switching pipeline is not arranged after the start-stop reactor adjusting valve 132.

In the first stack starting and flushing process, a steam-water separator is omitted, and when the temperature of the medium at the outlet of the steam generator meets the requirement of the flushing temperature, the medium can be directly used for flushing the steam turbine 2, so that the complexity of the system is further reduced, and the operation flow and the investment are simplified.

Because the engineering has 6 reactors, the starting and stopping working conditions are relatively more complicated, and the explanation only explains and analyzes the main working conditions. The starting conditions in the starting and stopping reactor conditions mainly include: normal cold start, shutdown and warm start, and shutdown and warm start in sequence. The shutdown working conditions mainly comprise: and (4) stopping the pile in case of accident and stopping the pile in normal sequence. The normal shutdown process is the reverse of the startup process, and the warm and hot startup processes are basically similar to the cold startup process, except that the temperature of the steam medium for the impulse merging is different according to the temperature of the steam turbine 2. In the accident shutdown condition, the main function of the startup and shutdown reactor is to receive the medium cooled by the steam generator, and the steam cooling function of the steam generator is moved to the auxiliary steam system. In conclusion, the method mainly analyzes the working condition of the first stack for normally starting the impulse turbine 2 and the two starting working conditions of the subsequent stack.

In summary, taking a 6-module high temperature reactor with a rated steam generator outlet pressure of 13.9MPa as an example, the utility model is described in detail as follows, and the schematic system diagram refers to fig. 1:

(1) starting condition 1 (first stack start-up rush-to-rush condition):

in a start-up supercooling stage and a saturation stage (the outlet pressure of the steam generator is 13.9MPa (a), the outlet temperature of the steam generator is from 150 ℃ to 336.1 ℃, the medium is water, the saturated medium is gradually changed from water to saturated steam, the flow rate is 36kg/s), two third isolation valves 121 from a main steam pipeline 11 of the outlet of the steam generator to a main steam main pipe 12 are in a closed state, and the medium enters a start-stop reactor flash tank 4 from the outlet of the steam generator along the main steam pipeline 11 through a corresponding fourth isolation valve 131 and a start-stop reactor regulating valve 132.

In the first overheating stage (the outlet pressure of the steam generator is 13.9mpa (a), the outlet temperature of the steam generator is 336.1 ℃ to 355 ℃, the medium is gradually changed from saturated steam to superheated steam, the flow rate is 36kg/s), two third isolation valves 121 on a main steam pipeline 11 at the outlet of the steam generator and on a main steam main pipe 12 are in a closed state, and the medium enters the start-stop reactor 4 from the outlet of the steam generator along the main steam pipeline 11 through a corresponding fourth isolation valve 131 and a start-stop reactor regulating valve 132.

In the second overheating stage (the outlet pressure of the steam generator is 13.9mpa (a), the outlet temperature of the steam generator stays at 355 ℃, and the medium is superheated steam), at this time, the first isolation valve 111 on the corresponding main steam pipeline 11 is gradually opened, so that a part of the main steam enters the condenser 3 along the main steam pipeline 11 through the bypass regulating valve 141, and the other part of the main steam still enters the start-stop reactor flash tank 4 from the start-stop reactor regulating valve 132. In the process, the bypass regulating valve 141 and the start-stop reactor regulating valve 132 jointly regulate the main steam pressure at the outlet of the steam generator to be 13.9MPa (a), the opening degree of the start-stop reactor regulating valve 132 is gradually reduced, the opening degree of the bypass regulating valve 141 is gradually increased until the start-stop reactor regulating valve 132 is closed, the main steam pressure at the outlet of the steam generator is independently controlled to be 13.9MPa (a) by the bypass regulating valve 141, and the fourth isolating valve 131 is closed.

In the third overheating stage (the outlet pressure of the steam generator is 13.9MPa (a), the outlet temperature of the steam generator is from 355 ℃ to 400 ℃, the medium is overheated steam, the temperature is continuously increased, and the flow rate is 36kg/s), at this time, each isolation valve still keeps the original opening and closing state, and the main steam pressure of the outlet of the corresponding steam generator is still controlled to be 13.9MPa (a) by the corresponding bypass adjusting valve 141.

In the fourth superheating stage (the steam generator outlet pressure is 13.9mpa (a)), the steam generator outlet temperature is stabilized at 400 ℃, the medium is superheated steam, the flow rate is 36kg/s, when the steam turbine 2 has a run-through condition, the run-through starts, at this time, the second isolation valve 112 on the main steam pipe 11 is gradually opened, so that a part of the main steam is merged into the main steam main pipe 12 along the main steam pipe 11, and enters the steam turbine 2 through the main steam valve 122, another part still enters the condenser 3 along the corresponding main steam bypass pipe 14 through the corresponding bypass regulating valve 141, in the process, the outlet pressure of the steam generator is adjusted to be 13.9MPa (a) by the bypass adjusting valve 141 and the main steam valve 122 together, and the opening degree of the main steam valve 122 is gradually increased, the opening degree of the bypass adjusting valve 141 is gradually reduced until the bypass adjusting valve is closed, at this time, the air inflow of the steam turbine is 36kg/s, and then the outlet pressure of the steam generator is changed to the adjustment of the main steam valve 122.

In the fifth superheating stage (the outlet pressure of the steam generator is 13.9MPa (a), the outlet temperature of the steam generator is from 400 ℃ to 571 ℃, the medium is superheated steam, and the flow rate is 36kg/s), and the outlet pressure of the steam generator is still adjusted to 13.9MPa (a) by the main steam valve 122.

In the sixth superheating stage (the outlet pressure of the steam generator is 13.9mpa (a)), the outlet temperature of the steam generator is stabilized at 571 ℃, the medium is superheated steam, the flow rate is increased from 36kg/s to 96kg/s corresponding to the full power of a single reactor, the corresponding power of the reactor is increased from 36kg/s to 96kg/s, in the process, the outlet pressure of the steam generator is adjusted to 13.9mpa (a) by the main steam valve 122, and the opening of the main steam valve 122 is gradually increased until the corresponding reactor is operated at the full power.

(2) Start-up condition 2 (subsequent stack start-up condition):

and in the starting supercooling stage, the saturation stage, the overheating stage I and the overheating stage II, the system running state is the same as the starting working condition 1.

In the third superheating stage (the outlet pressure of the steam generator is 13.9MPa (a), the outlet temperature of the steam generator is from 355 ℃ to 571 ℃, the medium is superheated steam, the temperature is continuously increased, and the flow rate is 36kg/s), at this time, each isolation valve still keeps the original open-close state, and the main steam pressure of the outlet of the corresponding steam generator is still independently controlled to be 13.9MPa (a) by the corresponding bypass regulating valve 141.

In the fourth overheating stage (the outlet pressure of the steam generator is 13.9MPa (a)), the outlet temperature of the steam generator is stabilized at 571 ℃, the medium is superheated steam, the flow rate is increased from 36kg/s to 96kg/s corresponding to the full power of the single reactor, at this time, the second isolation valve 112 on the main steam pipeline 11 is gradually opened, so that one part of the main steam is merged into the main steam main pipe 12 through the main steam pipeline 11 and enters the steam turbine 2 through the main steam valve 122, the other part of the main steam still enters the condenser 3 through the corresponding bypass regulating valve 141 along the corresponding main steam bypass pipeline 14, the corresponding reactor starts to increase the power, the flow rate is increased from 36kg/s to 96kg/s, in the process, the bypass regulating valve 141 regulates the main steam pressure at the outlet of the steam generator to be stabilized at 13.9MPa (a), the opening degree of the main steam valve 122 is gradually increased, the opening degree of the bypass regulating valve 141 is gradually reduced until the corresponding reactor runs at the full power, the corresponding bypass regulator valve 141 is closed.

The above embodiments are preferred embodiments of the present invention, and those skilled in the art can make variations and modifications to the above embodiments, therefore, the present invention is not limited to the above embodiments, and any obvious improvements, substitutions or modifications made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims (5)

1. The utility model provides a 600MW level multimode high temperature reactor opens stops system of piling which characterized in that: the system comprises a plurality of steam generators, a steam turbine (2), a condenser (3) and a start-stop reactor flash tank (4), wherein each steam generator is connected to a main steam main pipe (12) through a main steam pipeline (11) and then enters the steam turbine (2) in two ways; a start-stop reactor pipeline (13) is led out of a main steam pipeline (11) of each steam generator and is connected to a start-stop reactor flash tank (4); after the start-stop pile pipeline (13) is led out of each steam generator, a main steam bypass pipeline (14) is led out and connected to the condenser (3), and a bypass regulating valve (141) is arranged on each main steam bypass pipeline (14).

2. The 600 MW-level multi-module high-temperature reactor start-stop system according to claim 1, wherein: the number of the steam generators is 6, namely a first steam generator (101), a second steam generator (102), a third steam generator (103), a fourth steam generator (104), a fifth steam generator (105) and a sixth steam generator (105).

3. The 600 MW-level multi-module high-temperature reactor start-stop system according to claim 1, wherein: the primary steam pipeline (11) between the reactor starting and stopping pipeline (13) and the primary steam bypass pipeline (14) is provided with a first isolation valve (111), and the primary steam pipeline (11) between the primary steam bypass pipeline (14) and the primary steam main pipe (12) is provided with a second isolation valve (112).

4. The 600 MW-level multi-module high-temperature reactor start-stop system according to claim 1, wherein: and a third isolating valve (121) and a main steam valve (122) are arranged on the two main steam main pipes (12).

5. The 600 MW-level multi-module high-temperature reactor start-stop system according to claim 1, wherein: and each reactor starting and stopping pipeline (13) is provided with a fourth isolating valve (131) and a reactor starting and stopping regulating valve (132).

Images