CN216528053U - Reposition of redundant personnel cooling system and cooling water system - Google Patents
Reposition of redundant personnel cooling system and cooling water system Download PDFInfo
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- CN216528053U CN216528053U CN202122728542.9U CN202122728542U CN216528053U CN 216528053 U CN216528053 U CN 216528053U CN 202122728542 U CN202122728542 U CN 202122728542U CN 216528053 U CN216528053 U CN 216528053U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E30/00—Energy generation of nuclear origin
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Abstract
The utility model discloses a shunting cooling system and a cooling water system comprising the same. The pipeline assembly comprises a water supply pipeline, the driving device comprises a pressure control box and a variable frequency motor pump, the pressure control box is used for maintaining the water pressure of the water supply pipeline, the number of the shunting heat exchange units is more than three, each shunting heat exchange unit is connected in parallel with each other, each shunting heat exchange unit comprises a heat exchange pipeline, a heat exchanger and a first valve, the control assembly comprises a controller and first valve monitors, the number of the first valve monitors is the same as that of the shunting heat exchange units, each first valve monitor is electrically connected with the controller, when each first valve monitor monitors that the first valve is opened, a first signal is sent to the controller, the controller adjusts the frequency of the variable frequency motor pump according to the number of the received first signals, and therefore the ratio of the water supply flow of the water supply pipeline to the number of the opened heat exchange pipelines is kept to be a fixed value.
Description
Technical Field
The utility model belongs to the technical field of nuclear industry, and particularly relates to a shunting cooling system and a cooling water system comprising the same.
Background
The primary function of the nuclear power plant equipment cooling water system is to cool various nuclear island heat exchangers, transfer the heat load through the heat exchangers cooled by the essential plant water system to the final hot well seawater or air, form a barrier between the nuclear island heat exchangers and the seawater or air, and prevent the uncontrolled release of radioactive fluids into the seawater or air.
Fig. 1 is a cooling water system commonly used in the prior art. As shown in figure 1, the equipment cooling water system of a domestic and international common pressurized water reactor nuclear power plant adopts a one-by-one setting under the normal operation working condition and the accident working condition of the power plant, namely two rows of water supply pipelines and heat exchange pipelines are needed, the water supply pipelines are provided with a water pump 102 and a pressure control box 101, the heat exchange pipelines are provided with heat exchangers 103, because in the use process, only one row of the water pump 102 and the heat exchangers 103 basically needs to work, so the other row of the water pump 102 and the heat exchangers 103 adopt a redundancy design in the design, when the system needs to be put into two rows of operation under the starting working condition and the shutdown working condition of the power plant, the other row of the water pump 102 and the heat exchangers 103 has low use efficiency, the existing equipment capacity is wasted, and the water pump adopted in the prior art is a general centrifugal pump, and the water supply flow can not be adjusted according to the actual heat exchange requirement.
In addition, when the system is in a normal operation condition, and the temperature T7 is adopted as the temperature of the seawater inlet of the heat exchanger, the temperature of the equipment cooling water outlet of the heat exchanger is not higher than 35 ℃, so that the temperature difference between the temperature of the cold source and the temperature of water supply in the water supply pipeline is very low in a plant site with high seawater temperature or air temperature, the heat exchange area of the high-temperature plant site is increased, the heat exchange area is very large, and great difficulty is brought to plant layout and field installation and maintenance of a nuclear power plant. In addition, when the temperature of the cold source is low, the problem of excessive cooling of cooling water can be caused by adopting large-area heat exchange equipment.
SUMMERY OF THE UTILITY MODEL
The present invention provides a split cooling system and a cooling water system including the split cooling system, aiming at the above-mentioned defects of the prior art. The shunting cooling system comprises a plurality of shunting heat exchange units, the opening number of the heat exchange pipelines is flexibly adjusted according to actual heat exchange quantity requirements, and the utilization efficiency of the heat exchanger is improved to the maximum extent.
In order to solve the problems, the utility model adopts the following technical scheme:
a shunting cooling system is used for nuclear power plant equipment and comprises a driving device, a shunting heat exchange device, a pipeline assembly and a control assembly, wherein the number of the driving device is more than two, each driving device is connected in parallel, the pipeline assembly comprises a water supply pipeline and a cooling water pipeline, the driving device comprises a pressure control box and a variable frequency motor pump, the pressure control box and the variable frequency motor pump are arranged on the water supply pipeline, the pressure control box is communicated with the input end of the variable frequency motor pump and used for maintaining the water pressure of the water supply pipeline, the shunting heat exchange device comprises more than three shunting heat exchange units, each shunting heat exchange unit is connected in parallel, each shunting heat exchange unit comprises a heat exchange pipeline, a heat exchanger and a first valve, the input end of the heat exchange pipeline is communicated with the output end of the water supply pipeline, and the output end of the heat exchange pipeline is communicated with the input end of the cooling water pipeline, the heat exchanger and the first valve are arranged on the heat exchange pipeline, the first valve is arranged on one side of the heat exchanger close to the water supply pipeline and used for controlling the conduction and the closing of the heat exchange pipeline, the control assembly comprises a controller and first valve monitors, the number of the first valve monitors is the same as that of the shunting heat exchange units, each first valve monitor is electrically connected with the controller, each first valve monitor is arranged on the heat exchange pipeline of each shunting heat exchange unit and is positioned between the first valve and the heat exchanger and used for monitoring the opening and closing of the first valve and sending a first signal to the controller when the opening of the first valve is monitored, the controller is electrically connected with the variable frequency motor pump and used for adjusting the frequency of the variable frequency motor pump according to the number of the received first signals, so that the ratio of the water supply flow of the water supply pipeline to the opening quantity of the heat exchange pipeline is kept at a fixed value.
Preferably, the control module further includes an instrument unit including a flow meter installed on the cooling water pipe, electrically connected to the controller, for measuring a flow rate of water flowing through the cooling water pipe and transmitting a detected flow rate value to the controller, the controller further for comparing the flow rate value with a flow rate threshold value stored inside the controller when receiving the flow rate value, and controlling and adjusting a frequency of the inverter motor pump to increase/decrease a water supply flow rate of the water supply pipe when the comparison result is that the flow rate value transmitted from the flow meter is lower/higher than the flow rate threshold value, and a temperature meter installed on the cooling water pipe, electrically connected to the controller, for measuring a temperature of water flowing through the cooling water pipe and transmitting the detected temperature value to the controller, the controller is also used for comparing the temperature value with a stored temperature threshold value in the controller when receiving the temperature value, and controlling and adjusting the frequency of the variable frequency motor pump when the comparison result shows that the temperature value is higher than the temperature threshold value so as to improve the water supply flow of a water supply pipeline of the system.
Preferably, pipeline components still includes return water pipe, return water pipe's input with cooling water pipeline's output is linked together, return water pipe's output with water supply pipe is linked together, the last governing valve that is equipped with of return water pipe, the governing valve is used for controlling opening and close of return water pipe and adjusts return water pipe's flow, the controller still with the governing valve electricity is connected, still is used for when the temperature value that the temperature measurement meter sent is higher than the temperature threshold value, control the governing valve is opened to make cooling water pipeline's water reenter through return water pipe water supply pipe carries out circulative cooling.
Preferably, the flow-dividing heat exchange unit further comprises a second valve, the second valve is arranged on the heat exchange pipeline and is located at one end, far away from the first valve, of the heat exchanger, and is used for isolating the heat exchange pipeline and overhauling the heat exchanger.
Preferably, a third valve is arranged on the cooling water pipeline, and the third valve is close to one end of the cooling water pipeline, which is communicated with the heat exchange pipeline, and is used for controlling water flow in the cooling water pipeline.
Preferably, the pressure control boxes comprise overflow water conveying lines, the pressure control boxes in the driving devices are communicated with each other through the overflow water conveying lines, and when any one of the pressure control boxes overflows, the overflow water is drained to other pressure control boxes along the overflow water conveying lines so as to keep the total water volume in the system unchanged.
The utility model also provides a cooling water system, which comprises a user unit and the shunting cooling system, wherein the output end of the cooling water pipeline in the shunting cooling system is communicated with the input end of the user unit, and cooling water from the cooling water pipeline enters the user unit to finish heat exchange.
Preferably, the output end of the user unit is communicated with the input end of a water supply pipeline in the flow dividing and cooling system.
Preferably, the subscriber unit includes a plurality of subscriber columns, and the subscriber columns are connected in parallel with each other.
Preferably, each user column comprises a user pipeline, a fourth valve and heat exchange equipment, the output end of the cooling water pipeline is communicated with the input end of the user pipeline, the heat exchange equipment is arranged on the user pipeline through the fourth valve, and the fourth valve is arranged at one end, close to the cooling water pipeline, of the user pipeline.
The flow dividing and cooling system comprises a plurality of flow dividing and heat exchanging units, the corresponding number of flow dividing and heat exchanging units are opened according to the heat exchanging quantity requirement, the utilization efficiency of the heat exchanger in each heat exchanging unit is improved, the flow of the flow dividing and cooling system is controlled by the variable frequency motor pump, and the flow distribution is flexible.
Drawings
FIG. 1 is a prior art cooling water system for nuclear power plant equipment;
fig. 2 is a schematic structural view of a cooling water system in embodiment 2 of the present invention.
1-driving device, 11-pressure control box, 12-variable frequency motor pump, 2-shunt heat exchange unit, 21-heat exchange pipeline, 22-heat exchanger, 23-first valve, 24-second valve, 3-instrument unit, 31-flowmeter, 32-temperature measuring meter, 4-water return pipeline, 41-regulating valve, 5-water supply pipeline, 6-cooling water pipeline, 61-third valve, 7-user unit, 8-fifth valve, 81-sixth valve, 9-check valve, 101-pressure control box, 102-water pump and 103-heat exchanger.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. 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 scope of the present invention.
In the description of the present invention, it should be noted that the indication of orientation or positional relationship, such as "on" or the like, is based on the orientation or positional relationship shown in the drawings, and is only for convenience and simplicity of description, and does not indicate or imply that the device or element referred to must be provided with a specific orientation, constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected," "disposed," "mounted," "fixed," and the like are to be construed broadly, e.g., as being fixedly or removably connected, or integrally connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The utility model provides a shunting cooling system, which is used for nuclear power plant equipment and comprises more than two driving devices, shunting heat exchange devices, pipeline assemblies and control assemblies, wherein the driving devices are connected in parallel, each pipeline assembly comprises a water supply pipeline and a cooling water pipeline, each driving device comprises a pressure control box and a variable frequency motor pump, the pressure control boxes and the variable frequency motor pumps are arranged on the water supply pipelines, the pressure control boxes are communicated with the input ends of the variable frequency motor pumps and used for maintaining the water pressure of the water supply pipelines, each shunting heat exchange device comprises more than three shunting heat exchange units, each shunting heat exchange unit is connected in parallel, each shunting heat exchange unit comprises a heat exchange pipeline, a heat exchanger and a first valve, the input ends of the heat exchange pipelines are communicated with the output ends of the water supply pipelines, the output end of the heat exchanger is communicated with the input end of the cooling water pipeline, the heat exchanger and the first valves are arranged on the heat exchange pipeline, the first valves are arranged on one side, close to the water supply pipeline, of the heat exchanger and used for controlling the conduction and the closing of the heat exchange pipeline, the control assembly comprises a controller and first valve monitors, the number of the first valve monitors is the same as that of the shunting heat exchange units, each first valve monitor is electrically connected with the controller, each first valve monitor is arranged on the heat exchange pipeline of each shunting heat exchange unit and is positioned between the first valve and the heat exchanger and used for monitoring the opening and closing of the first valve and sending a first signal to the controller when the opening of the first valve is monitored, the controller is electrically connected with the variable frequency motor pump and used for adjusting the frequency of the variable frequency motor pump according to the number of the received first signals, so that the ratio of the water supply flow of the water supply pipeline to the opening quantity of the heat exchange pipeline is kept at a fixed value.
The utility model also provides a cooling water system, which comprises a user unit and the shunting cooling system, wherein the output end of the cooling water pipeline in the shunting cooling system is communicated with the input end of the user unit, and cooling water from the cooling water pipeline enters the user unit to finish heat exchange.
Example 1
The embodiment discloses a shunting cooling system, which is used for nuclear power plant equipment and comprises a driving device 1, shunting heat exchange devices, a pipeline assembly and a control assembly, wherein the number of the driving device 1 is more than two, each driving device 1 is connected in parallel, the pipeline assembly comprises a water supply pipeline 5 and a cooling water pipeline 6, the driving device 1 comprises a pressure control box 11 and a variable frequency motor pump 12, the pressure control box 11 and the variable frequency motor pump 12 are both arranged on the water supply pipeline 5, the pressure control box 11 is communicated with the input end of the variable frequency motor pump 12 and used for maintaining the water pressure of the water supply pipeline 5, the shunting heat exchange devices comprise more than three shunting heat exchange units 2, each shunting heat exchange unit 2 is connected in parallel, each shunting heat exchange unit 2 comprises a heat exchange pipeline 21, a heat exchanger 22 and a first valve 23, the input end of the heat exchange pipeline 21 is communicated with the output end of the water supply pipeline 5, and the output end of the heat exchange pipeline is communicated with the input end of the cooling water pipeline 6, the heat exchanger 22 and the first valve 23 are arranged on the heat exchange pipeline 21, the first valve 23 is arranged on one side of the heat exchanger 22 close to the water supply pipeline 5, used for controlling the conduction and the closing of the heat exchange pipeline 21, the control assembly comprises a controller and first valve monitors, the number of the first valve monitors is the same as that of the shunting heat exchange units 2, each first valve monitor is electrically connected with the controller, each first valve monitor is respectively arranged on the heat exchange pipeline 21 of each shunting heat exchange unit 2 and is positioned between a first valve 23 and a heat exchanger 22, is used for monitoring the opening and closing of the first valve 23 and sending a first signal to the controller when the opening of the first valve 23 is monitored, the controller is electrically connected with the variable frequency motor pump 12, for adjusting the frequency of the variable frequency motor pump 12 according to the number of the received first signals so that the ratio of the water supply flow rate of the water supply pipeline 5 to the number of the opened heat exchange pipelines 21 is maintained at a constant value.
In this embodiment, a check valve 9 is disposed on the water supply pipeline 5, and the check valve 9 is disposed at an end of the water supply pipeline 5 near the end communicating with the heat exchange pipeline 21 for preventing water in the heat exchange pipeline 21 from flowing back to the water supply pipeline 5.
In this embodiment, the number of the driving devices 1 is two, each driving device 1 comprises a pressure control box 11 and a variable frequency motor pump 12, the two variable frequency motor pumps 12 operate independently, and when one of the two variable frequency motor pumps fails, the other one can be used for standby in time. In practice, according to the user demand, this reposition of redundant personnel cooling system can the optional cooperation two or more inverter motor pump 12, and it can be understood, in order to guarantee the maintenance needs, need reserve an inverter motor pump 12 at least and use when supplying emergency.
In this embodiment, the first valve monitors are disposed on the heat exchange pipes 21 and used for monitoring the opening and closing of the first valves 23 and sending a first signal to the controller when the first valves 23 are monitored to be opened, because the number of the first valve monitors is the same as that of the heat exchange pipes, and each first valve monitor is disposed on each heat exchange pipe 21, the controller can acquire the number of the opened heat exchange pipes, and the controller can control the frequency of the variable frequency motor pump 12 according to the number of the opened heat exchange pipes 21, so that the water flow from the water supply pipe 5 is matched with the number of the opened heat exchange pipes 21, and the service efficiency of the heat exchanger 22 is effectively improved.
As shown in fig. 2, the control module further includes a meter unit 3, the meter unit 3 includes a flow meter 31, a temperature measuring meter 32, the flow meter 31 is mounted on the cooling water pipe 6, and is electrically connected to the controller for measuring the flow rate of water flowing through the cooling water pipe 6 and transmitting the detected flow rate value to the controller, the controller is further configured to compare the flow rate value with a flow rate threshold stored inside the controller when receiving the flow rate value, and to control and adjust the frequency of the inverter motor pump 12 to increase/decrease the supply water flow rate of the water supply pipe 5 when the comparison result is that the flow rate value transmitted from the flow meter 31 is lower/higher than the flow rate threshold.
The temperature measuring meter 32 is installed on the cooling water pipe 6 and electrically connected to the controller, and is used for measuring the temperature of the water flowing through the cooling water pipe 6 and transmitting the detected temperature value to the controller, and the controller is further used for comparing the temperature value with a stored temperature threshold value inside the controller when receiving the temperature value, and controlling and adjusting the frequency of the variable frequency motor pump 12 when the comparison result shows that the temperature value is higher than the temperature threshold value, so as to increase the water supply flow of the water supply pipe 5, and reduce the water temperature in the cooling water pipe 6 to be lower than the temperature threshold value stored in the controller.
In this embodiment, the flow meter 31 and the temperature measuring meter 32 are disposed on the cooling water pipeline 6, and can constantly keep measuring the flow rate and the temperature of the water in the cooling water pipeline 6, and transmit the measured flow rate and temperature value to the controller in time, so that the controller can flexibly adjust the frequency of the inverter motor pump 12 according to the actual flow rate and temperature in the cooling water pipeline 6, and further the whole system can generate stable cooling water with a suitable temperature.
As shown in fig. 2, the pipeline assembly further includes a water return pipe 4, an input end of the water return pipe 4 is communicated with an output end of the cooling water pipe 6, an output end of the water return pipe 4 is communicated with the water supply pipe 5, a regulating valve 41 is arranged on the water return pipe 4, the regulating valve 41 is a pneumatic regulating valve for controlling opening and closing of the water return pipe 4 and water flow passing through the water return pipe 4, the controller is electrically connected with the regulating valve 41, and the controller is further configured to control the regulating valve 41 to open when a temperature value sent by the temperature measuring meter 32 is higher than a temperature threshold value, so that part of water of the cooling water pipe 6 reenters the water supply pipe 5 for circulating cooling through the water return pipe 4, and accordingly the temperature of the water in the cooling water pipe 6 is lower than the temperature threshold value stored in the controller.
In this embodiment, the quantity of reposition of redundant personnel heat exchange unit 2 is more than three, connect in parallel each other between a plurality of heat exchange unit, every reposition of redundant personnel heat exchange unit 2 includes heat transfer pipeline 21, heat exchanger 22 and first valve 23, the input of heat transfer pipeline 21 is linked together with the output of water supply pipe 5, its output is linked together with the input of cooling water pipeline 6, heat exchanger 22 and first valve 23 are located on heat transfer pipeline 21, and first valve 23 is electronic isolating valve, locate one side that heat exchanger 22 is close to water supply pipe 5, be used for controlling switching on and closing of water supply pipe 5 and heat transfer pipeline 21, when first valve 23 opens, the water that comes from in the water supply pipe 5 flows into heat exchanger 22 through the input of heat transfer pipeline 21.
Optionally, the shunting heat exchange unit 2 further includes a second valve 24, the second valve 24 is a manual isolation valve, and is disposed on one side of the heat exchanger 22 close to the heat exchanger 22, and is configured to isolate the heat exchange pipeline 21 from the cooling water pipeline 6, and when the heat exchanger 22 fails, the second valve 24 is manually adjusted to be closed, so as to facilitate maintenance of the heat exchanger 22.
In this embodiment, the cooling water pipeline 6 is provided with a third valve 61, similarly, the third valve 61 is an electric isolation valve, and the third valve 61 is provided at one end of the cooling water pipeline 6, which is communicated with the heat exchange pipeline 21, and is used for controlling the opening and closing of the cooling water pipeline 6.
In this embodiment, the pressure control boxes 11 include overflow water transmission lines, and each of the pressure control boxes 11 in each of the driving devices 1 is communicated with each other through one overflow water transmission line, and when any one of the pressure control boxes 11 overflows, the overflow water is drained to the other pressure control boxes 11 along the overflow water transmission line to maintain the total water amount in the system unchanged.
In this embodiment, the cold source of the heat exchanger 22 is seawater or air, and the water from the water supply pipeline 5 enters the heat exchanger 22 through the heat exchange pipeline 21, so as to exchange heat with the cold source, and the cooled cooling water flows from the output end of the heat exchange pipeline 21 to the cooling water pipeline 6. Due to different site selection of nuclear power plants, the external environment temperature of the nuclear power plants can also be different.
In the prior art, when the temperature T7 is used as the seawater inlet temperature of the heat exchanger 22, the temperature of the equipment cooling water outlet of the heat exchanger 22 is not higher than 35 ℃, which causes the problem that the temperature difference between the cold source temperature and the temperature of the water from the water supply pipeline 5 is very low in a plant site with high seawater temperature or air temperature, and the temperature of the cold source is relatively close to 35 ℃, thereby the problem needs to be solved by increasing the heat exchange area, the heat exchange area of the high-temperature plant site is very large, and great difficulty is brought to plant arrangement and field installation and maintenance of a nuclear power plant. In addition, when the cold source temperature is lower, the problem of overcooling of cooling water due to the adoption of large-area heat exchange equipment is solved, and energy waste is caused.
In this embodiment, to external environment's difference, can be through the nimble reasonable selection heat transfer pipeline 21 open quantity and the corresponding discharge of adjustment inverter motor pump 12, promote the availability factor of heat exchanger 22 to furthest, when external environment temperature is high, also need not to increase heat transfer area. Of course, this reposition of redundant personnel cooling system can also be through 4 circulative cooling of return water pipeline, further guarantees that the temperature in the cooling water pipeline 6 meets the demands.
Example 2
As shown in fig. 2, the present embodiment discloses a cooling water system, which includes a user unit 7, and further includes the split cooling system of embodiment 1, wherein the output end of the cooling water pipeline 6 in the split cooling system is communicated with the input end of the user unit 7, and the cooling water from the cooling water pipeline 6 enters the user unit 7 to perform heat exchange.
In this embodiment, the output of the consumer unit 7 is in communication with the input of the water supply pipe 5, so that the water flowing through the consumer unit 7 can be recycled.
As shown in fig. 2, the user unit 7 includes a plurality of user columns, the user columns are connected in parallel, each user column includes a user pipeline, a fourth valve and a heat exchange device, the heat exchange device and the fourth valve are disposed on the user pipeline, and the fourth valve is disposed at an output end close to the cooling water pipeline 6, and is used for controlling opening and closing of the user pipeline.
In this embodiment, the user unit 7 includes a safety a-column user group, a public column user group, and a safety B-column user group, the safety column user group includes devices for maintaining safety redundancy of the nuclear power plant, and is divided into A, B series of users, the public column includes devices for maintaining normal operation of the nuclear power plant, the three types of user groups are connected in parallel and are all communicated with the output end of the cooling water pipeline 6, and the three types of user groups are separated by an isolation valve, so that the supply of cooling water to the various types of user groups can be flexibly adjusted.
In this embodiment, two cooling water pipes 6 are provided in the split cooling system, the input ends of the two cooling water pipes 6 are respectively connected with the output end of the heat exchange pipe 21, the output end of one cooling water pipe 6 is communicated with the safety a row user group, the output end of the other cooling water pipe 6 is communicated with the safety B row user group, the public row user group is connected in parallel with and between the safety a row user group and the safety B row user group, a fifth valve 8 is provided between the public row user group and the safety a row user group, a sixth valve 81 is provided between the public row user group and the safety B row user group, and the fifth valve 8 and the sixth valve 81 are both electric isolation valves and are used for controlling whether the cooling water from the two cooling water pipes 6 flows into the public row user group or not.
In this embodiment, according to the specific opening number of the three user groups and the heat exchange amount requirement of each user group, the number of the heat exchange pipes 21 to be opened is calculated, and then the controller adjusts the frequency of the variable frequency motor pump 12 to meet the appropriate water supply flow rate, so that the heat exchanger 22 can be utilized with the maximum efficiency.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the utility model, and these modifications and improvements are also considered to be within the scope of the utility model.
Claims (10)
1. A flow-dividing cooling system for nuclear power plant equipment is characterized by comprising a driving device (1), a flow-dividing heat exchange device, a pipeline assembly and a control assembly,
the number of the driving devices (1) is more than two, the driving devices (1) are mutually connected in parallel,
the pipeline component comprises a water supply pipeline (5) and a cooling water pipeline (6),
the driving device (1) comprises a pressure control box (11) and a variable frequency motor pump (12), the pressure control box (11) and the variable frequency motor pump (12) are both arranged on the water supply pipeline (5), the pressure control box (11) is communicated with the input end of the variable frequency motor pump (12) and is used for maintaining the water pressure of the water supply pipeline (5),
the shunting heat exchange device comprises more than three shunting heat exchange units (2), each shunting heat exchange unit (2) is connected in parallel,
the shunting heat exchange unit (2) comprises a heat exchange pipeline (21), a heat exchanger (22) and a first valve (23), the input end of the heat exchange pipeline (21) is communicated with the output end of the water supply pipeline (5), the output end of the heat exchange pipeline is communicated with the input end of the cooling water pipeline (6), the heat exchanger (22) and the first valve (23) are arranged on the heat exchange pipeline (21), the first valve (23) is arranged on one side, close to the water supply pipeline (5), of the heat exchanger (22) and used for controlling the conduction and the closing of the heat exchange pipeline (21),
the control assembly includes a controller and a first valve monitor,
the number of the first valve monitors is the same as that of the shunting heat exchange units (2), each first valve monitor is electrically connected with the controller, each first valve monitor is arranged on a heat exchange pipeline (21) of each shunting heat exchange unit (2) and positioned between the first valve (23) and the heat exchanger (22) and used for monitoring the opening and closing of the first valve (23) and sending a first signal to the controller when the opening of the first valve (23) is monitored,
the controller is electrically connected with the variable-frequency motor pump (12) and used for adjusting the frequency of the variable-frequency motor pump (12) according to the number of the received first signals so as to keep the ratio of the water supply flow of the water supply pipeline (5) to the number of the opened heat exchange pipelines (21) at a fixed value.
2. The split cooling system according to claim 1, wherein said control assembly further comprises a meter unit (3), said meter unit (3) comprising a flow meter (31), a temperature meter (32),
the flow meter (31) is installed on the cooling water pipe (6), is electrically connected with the controller, and is used for measuring the water flow passing through the cooling water pipe (6) and transmitting the detected flow value to the controller,
the controller is also used for comparing the flow value with a flow threshold value stored in the controller when the flow value is received, and controlling and adjusting the frequency of the variable frequency motor pump (12) to increase/decrease the water supply flow of the water supply pipeline (5) when the flow value transmitted by the flow meter (31) is lower/higher than the flow threshold value,
the temperature meter (32) is installed on the cooling water pipe (6), is electrically connected with the controller, and is used for measuring the temperature of the water flowing through the cooling water pipe (6) and transmitting the detected temperature value to the controller,
the controller is also used for comparing the temperature value with a stored temperature threshold value in the controller when receiving the temperature value, and controlling and adjusting the frequency of the variable-frequency motor pump (12) when the comparison result shows that the temperature value is higher than the temperature threshold value, so as to improve the water supply flow of a water supply pipeline (5) of the system.
3. A split stream hypothermia system according to claim 2 wherein the pipe assembly further comprises a water return pipe (4),
the input end of the water return pipeline (4) is communicated with the output end of the cooling water pipeline (6), the output end of the water return pipeline (4) is communicated with the water supply pipeline (5),
the water return pipeline (4) is provided with a regulating valve (41), the regulating valve (41) is used for controlling the opening and closing of the water return pipeline (4) and regulating the flow of the water return pipeline,
the controller is also electrically connected with the regulating valve (41) and is further used for controlling the regulating valve (41) to be opened when the temperature value sent by the temperature measuring meter (32) is higher than a temperature threshold value, so that the water in the cooling water pipeline (6) reenters the water supply pipeline (5) through the water return pipeline (4) for circulation cooling.
4. The split stream desuperheating system of claim 3, wherein said split stream heat exchange unit (2) further comprises a second valve (24),
the second valve (24) is arranged on the heat exchange pipeline (21) and is positioned at one end, far away from the first valve (23), of the heat exchanger (22) and used for isolating the heat exchange pipeline and overhauling the heat exchanger.
5. The split cooling system according to claim 4, wherein a third valve (61) is arranged on the cooling water pipeline (6),
the third valve (61) is close to one end of the cooling water pipeline (6) communicated with the heat exchange pipeline (21) and is used for controlling water flow in the cooling water pipeline (6).
6. The split stream hypothermia system of claim 1 wherein the pressure control tank (11) comprises an overflow water line,
the pressure control boxes (11) in each driving device (1) are communicated with each other through overflow water conveying pipelines respectively, and when any one of the pressure control boxes (11) overflows, overflow water is drained to other pressure control boxes (11) along the overflow water conveying pipelines so as to keep the total water volume in the system unchanged.
7. A cooling water system comprising a consumer unit (7), characterized by further comprising a split stream hypothermia system according to any of claims 1-6,
the output end of a cooling water pipeline (6) in the shunting and cooling system is communicated with the input end of the user unit (7), and cooling water from the cooling water pipeline (6) enters the user unit (7) to complete heat exchange.
8. The cooling water system as claimed in claim 7,
the output end of the user unit (7) is communicated with the input end of a water supply pipeline (5) in the flow dividing and cooling system.
9. Cooling water system according to claim 8, characterized in that the consumer unit (7) comprises a plurality of consumer columns, which are connected in parallel with each other.
10. The cooling water system as claimed in claim 9, wherein each of the user columns includes a user pipe, a fourth valve, a heat exchange device,
the output end of the cooling water pipeline (6) is communicated with the input end of the user pipeline, the heat exchange device and the fourth valve are arranged on the user pipeline, and the fourth valve is arranged at one end, close to the cooling water pipeline (6), of the user pipeline.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122728542.9U CN216528053U (en) | 2021-11-09 | 2021-11-09 | Reposition of redundant personnel cooling system and cooling water system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122728542.9U CN216528053U (en) | 2021-11-09 | 2021-11-09 | Reposition of redundant personnel cooling system and cooling water system |
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