CN111720938A

CN111720938A - Control method and control system for ventilation system of nuclear auxiliary plant

Info

Publication number: CN111720938A
Application number: CN202010430796.XA
Authority: CN
Inventors: 王远国; 王鑫; 刘杰; 李云臣; 陈文彬
Original assignee: China General Nuclear Power Corp; CGN Power Co Ltd; Daya Bay Nuclear Power Operations and Management Co Ltd; Lingdong Nuclear Power Co Ltd; Guangdong Nuclear Power Joint Venture Co Ltd; Lingao Nuclear Power Co Ltd
Current assignee: China General Nuclear Power Corp; CGN Power Co Ltd; Daya Bay Nuclear Power Operations and Management Co Ltd; Lingdong Nuclear Power Co Ltd; Guangdong Nuclear Power Joint Venture Co Ltd; Lingao Nuclear Power Co Ltd
Priority date: 2020-05-20
Filing date: 2020-05-20
Publication date: 2020-09-29
Anticipated expiration: 2040-05-20
Also published as: CN111720938B

Abstract

The invention relates to the technical field of nuclear power station ventilation systems, and provides a control method and a control system of a nuclear auxiliary factory building ventilation system, wherein the method comprises the following steps: respectively monitoring the states of an iodine exhaust fan, a blower, an exhaust fan and an EBA system; when the iodine exhaust fan is in a closed state, controlling the iodine-free exhaust fan and the air feeder to be in a closed state; when the EBA system is in a non-B condition and the iodine-free exhaust fan is in a closed state, controlling the air blower to be in a closed state; when the EBA system is in a B working condition or the air feeder is in a closed state, controlling the iodine-free exhaust fan to be in a closed state; the air supply amount of the air feeder is controlled by the iodine pollution-free area, the first negative pressure and the second negative pressure between the iodine pollution-free area and the atmosphere, and the air exhaust amount of the iodine-free exhaust fan is controlled by the third negative pressure between the iodine pollution-free area and the iodine pollution-free area. The problem that the air feeder and the iodine-free exhaust fan are abnormally tripped and shut down due to unstable operation of the negative pressure control system is solved, and the operation stability of the ventilation system of the nuclear auxiliary factory building is improved.

Description

Control method and control system for ventilation system of nuclear auxiliary plant

Technical Field

The invention relates to the technical field of ventilation systems of nuclear power stations, in particular to a control system of a ventilation system of a nuclear auxiliary plant and a control method of the ventilation system of the nuclear auxiliary plant.

Background

The nuclear auxiliary factory building ventilation system of the primary nuclear power station in Bay and Australia Ridge controls the air blower and the iodine-free exhaust fan to be tripped and closed through the negative pressure control system, and due to the fact that the negative pressure control system of the nuclear auxiliary factory building ventilation system of the primary nuclear power station in Bay and Australia Ridge is unstable in operation, abnormal tripping and closing faults of the air blower and the iodine-free exhaust fan frequently occur, and random IO1 (nuclear safety equipment unavailable alarm) is generated. The shutdown of the nuclear auxiliary plant ventilation system causes the whole nuclear auxiliary plant to lose ventilation, the chimney flow rate is reduced, the normal operation of the nuclear power plant system is affected, and the consumption ratio (the ratio of the time actually consumed for maintenance due to faults to the withdrawal time specified by the corresponding IO clauses) of the random first group I0 (nuclear safety equipment is unavailable) is increased.

Disclosure of Invention

Therefore, it is necessary to provide a control method for a ventilation system of a nuclear auxiliary plant, which aims at the problem that the negative pressure control system of the ventilation system of the nuclear auxiliary plant is unstable in operation, so that the abnormal tripping closing faults of a blower and an iodine-free exhaust fan frequently occur.

A control method of a ventilation system of a nuclear auxiliary factory building, wherein the ventilation system of the nuclear auxiliary factory building comprises a blower for supplying air to an iodine-free pollution area and an iodine-free pollution area, an iodine-free exhaust fan for exhausting air from the iodine-free pollution area and an iodine exhaust fan for exhausting air from the iodine-free pollution area, and the control method comprises the following steps:

respectively monitoring the states of the iodine exhaust fan, the air feeder, the exhaust fan and a reactor factory building ventilation system;

when the iodine exhaust fan is in a closed state, the iodine-free exhaust fan and the air feeder are respectively controlled to be in a closed state;

when the reactor factory building ventilation system is in a non-B working condition and the iodine-free exhaust fan is in a closed state, controlling the blower to be in a closed state;

when the reactor factory building ventilation system is in a working condition B or the blower is in a closed state, controlling the iodine-free exhaust fan to be in a closed state;

respectively measuring a first negative pressure, a second negative pressure and a third negative pressure among the iodine pollution-free area, the iodine pollution area and the atmosphere and the iodine pollution area and the iodine pollution-free area;

when the first negative pressure or the second negative pressure is smaller than a first preset value, controlling to reduce the air output of the air feeder;

when the third negative pressure is smaller than a second preset value, controlling and reducing the air exhaust amount of the iodine-free exhaust fan;

wherein, the working condition B refers to that one unit in the ventilation and ventilation system of the reactor factory is in cold shutdown and the EBA system is polluted.

In one embodiment, the iodine-free exhaust fan comprises a No. 1 exhaust fan and a No. 2 exhaust fan, the blower comprises a No. 1 blower and a No. 2 blower, and when the iodine-free exhaust fan is in the off state, the step of respectively controlling the iodine-free exhaust fan and the blower to be in the off state comprises the following steps:

when the iodine exhaust fan is in a closed state, respectively controlling the No. 1 exhaust fan and the No. 2 exhaust fan to be in a closed state;

when the iodine exhaust fan is in a closed state, the No. 1 blower and the No. 2 blower are respectively controlled to be in a closed state;

correspondingly, when the reactor factory building ventilation and ventilation system is in a non-B condition and the iodine-free exhaust fan is in a closed state, the step of controlling the air feeder to be in the closed state comprises the following steps:

when the ventilation and ventilation system of the reactor factory is in a non-B state and the No. 1 exhaust fan is in a closed state, controlling the No. 1 blower to be in a closed state;

when the ventilation and ventilation system of the reactor factory is in a non-B state and the No. 2 exhaust fan is in a closed state, controlling the No. 2 blower to be in a closed state;

correspondingly, when the ventilation and ventilation system of the reactor factory building is in the B working condition or the blower is in the closed state, the step of controlling the iodine-free exhaust fan to be in the closed state comprises the following steps:

when the ventilation and ventilation system of the reactor factory is in a working condition B or the No. 1 blower is in a closed state, controlling the No. 1 exhaust fan to be in a closed state;

and when the ventilation and ventilation system of the reactor factory is in the B working condition or the No. 2 blower is in the closed state, controlling the No. 2 exhaust fan to be in the closed state.

In one embodiment, the iodine-free exhaust fan includes a No. 3 exhaust fan, the blower includes a No. 3 blower, and when the iodine-free exhaust fan is in the off state, the step of respectively controlling the iodine-free exhaust fan and the blower to be in the off state further includes:

when the iodine exhaust fan is in a closed state, respectively controlling the No. 3 exhaust fan and the No. 3 air feeder to be in a closed state;

when the ventilation and ventilation system of the reactor building is in a non-B state and the iodine-free exhaust fan is in a closed state, the step of controlling the blower to be in the closed state further comprises the following steps:

when the reactor factory ventilation system is in a non-B working condition and the No. 3 exhaust fan is in a closed state, controlling the No. 3 blower to be in a closed state;

when the reactor building ventilation system is in the B working condition or the blower is in the closed state, the step of controlling the iodine-free exhaust fan to be in the closed state further comprises the following steps:

and when the ventilation and ventilation system of the reactor factory is in the B working condition or the No. 3 blower is in the closed state, controlling the No. 3 exhaust fan to be in the closed state.

In one embodiment, the iodine exhaust fans comprise a No. 4 exhaust fan and a No. 5 exhaust fan, and when the iodine exhaust fans are in an off state, the step of respectively controlling the iodine-free exhaust fans and the air feeder to be in the off state comprises the following steps:

when the No. 4 exhaust fan and the No. 5 exhaust fan are both in the closed state, the iodine-free exhaust fan and the air feeder are respectively controlled to be in the closed state.

In one embodiment, the control method further includes:

when a first opening signal for controlling the iodine-free exhaust fan to be opened is received, controlling the iodine-free exhaust fan to be in an opening state;

when the reactor factory ventilation system is in a B condition, the iodine-free exhaust fan is in a closed state, or the iodine-free exhaust fan is in an open state, and a second opening signal for controlling the blower to be opened is received, the blower is controlled to be in the open state;

when a first closing signal for controlling the iodine-free exhaust fan to close is received, controlling the iodine-free exhaust fan to be in a closing state;

and when receiving a second closing signal for controlling the blower to be closed, controlling the blower to be in a closing state.

In one embodiment, before controlling the iodine-free exhaust fan to be in an on state or receiving a first off signal for controlling the iodine-free exhaust fan to be off, the method further includes: controlling the iodine-free exhaust fan to reset;

controlling the blower to be in an on state or before controlling the blower to be in an off state when receiving a second off signal for controlling the blower to be off, the method further comprises: and controlling the blower to reset.

In one embodiment, the first predetermined value and the second predetermined value are both 1.035bar.

In one embodiment, the control method further includes:

when the first negative pressure or the second negative pressure is less than or equal to 0.59 bar, sending a first pressure difference alarm signal;

and when the third negative pressure is less than or equal to 0.59 bar, a second pressure difference alarm signal is sent out.

In the above method for controlling a ventilation system of a nuclear-assisted plant, the ventilation system of the nuclear-assisted plant comprises a blower for blowing air to an iodine-free polluted area and an iodine-polluted area, an iodine-free exhaust fan for exhausting air from the iodine-free polluted area, and an iodine exhaust fan for exhausting air from the iodine-polluted area, the control method comprises: respectively monitoring the states of the iodine exhaust fan, the air feeder, the exhaust fan and a reactor factory building ventilation system; when the iodine exhaust fan is in a closed state, respectively controlling the iodine-free exhaust fan and the air feeder to be in a closed state; when the ventilation and ventilation system of the reactor factory is in a non-B state and the iodine-free exhaust fan is in a closed state, controlling the blower to be in a closed state; when the ventilation and ventilation system of the reactor factory is in the working condition B or the blower is in the closed state, controlling the iodine-free exhaust fan to be in the closed state; respectively measuring a first negative pressure, a second negative pressure and a third negative pressure between an iodine pollution-free area, an iodine pollution area and the atmosphere and between the iodine pollution area and the iodine pollution-free area; when the first negative pressure or the second negative pressure is smaller than a first preset value, controlling to reduce the air output of the air feeder; when the third negative pressure is smaller than the second preset value, controlling and reducing the air exhaust amount of the iodine-free exhaust fan; the working condition B refers to that one unit in the reactor factory ventilation system is in cold shutdown and the reactor factory ventilation system is polluted. According to the scheme, when the iodine exhaust fan is in a closed state, the iodine-free exhaust fan and the air feeder are respectively controlled to be in a closed state; when the ventilation and ventilation system of the reactor factory is in a non-B state and the iodine-free exhaust fan is in a closed state, controlling the blower to be in a closed state; and when the ventilation and ventilation system of the reactor factory is in the B working condition or the blower is in the closed state, controlling the iodine-free exhaust fan to be in the closed state. The problem that abnormal tripping of the air feeder and the iodine-free exhaust fan is frequently shut down due to unstable operation of the negative pressure control system when the negative pressure control system controls the air feeder and the iodine-free exhaust fan in the ventilation system of the nuclear auxiliary factory building to trip and shut down is avoided, the operation stability of the ventilation system of the nuclear auxiliary factory building is improved, and the consumption ratio of the random first group I0 is reduced. And when the scheme measures that the first negative pressure between the iodine-free pollution area and the atmosphere or the second negative pressure between the iodine-free pollution area and the atmosphere is smaller than a first preset value, the air supply quantity of the air feeder is controlled to be reduced, when the third negative pressure between the iodine-free pollution area and the iodine-free pollution area is measured to be smaller than a second preset value, the air supply quantity of the air feeder is controlled to be reduced, the fluctuation of the first negative pressure, the second negative pressure or the third negative pressure is reduced, and the requirement of the nuclear auxiliary factory building ventilation system on the first negative pressure, the second negative pressure or the third negative pressure is ensured within a certain range.

The utility model provides a control system of factory building ventilation system is assisted to nuclear, factory building ventilation system is assisted to nuclear is including being used for the forced draught blower to the air supply of no iodine pollution district and iodine pollution district for the no iodine exhaust fan of no iodine pollution district exhaust air, the iodine exhaust fan that is used for iodine pollution district to exhaust air, control system includes:

the iodine exhaust state acquisition module is connected with the iodine exhaust fan and used for acquiring the state of the iodine exhaust fan and sending a first iodine exhaust signal when the iodine exhaust fan is in a closed state;

the iodine-free exhaust state acquisition module is respectively connected with the iodine-free exhaust fan and the reactor plant ventilation system and used for acquiring the state of the iodine-free exhaust fan, acquiring whether the reactor plant ventilation system is in a working condition B or not and sending a first iodine-free exhaust signal when the reactor plant ventilation system is in a non-working condition B and the iodine-free exhaust fan is in a closed state;

the reactor plant ventilation system comprises a reactor plant ventilation system, an air supply state acquisition module, a first air supply signal and a second air supply signal, wherein the reactor plant ventilation system is used for ventilating a reactor plant, and the reactor plant ventilation system is used for ventilating a reactor plant;

the first negative pressure detection module is respectively connected with the air feeder, an air outlet of the air feeder, the iodine pollution-free area and the iodine pollution area and is used for respectively measuring first negative pressure and second negative pressure between the iodine pollution-free area, the iodine pollution area and the atmosphere; the first negative pressure detection module is also used for controlling and reducing the air output of the air feeder when the first negative pressure or the second negative pressure is smaller than a first preset value;

the second negative pressure detection module is respectively connected with the iodine-free exhaust fan, the iodine-free pollution area and the iodine pollution area and is used for measuring a third negative pressure between the iodine pollution area and the iodine-free pollution area; the second negative pressure detection module is also used for controlling and reducing the exhaust volume of the iodine-free exhaust fan when the third negative pressure is smaller than a second preset value;

the control module is respectively connected with the iodine air exhaust state acquisition module, the iodine-free air exhaust state acquisition module, the air supply state acquisition module, the iodine exhaust fan, the iodine-free exhaust fan and the air feeder, and is used for controlling the air feeder to be in a closed state when receiving a first iodine air exhaust signal or a first iodine-free air exhaust signal; the control module is also used for controlling the iodine-free exhaust fan to be in a closed state when receiving a first iodine exhaust signal or a first air supply signal;

the working condition B refers to that one unit in the reactor factory ventilation system is in cold shutdown and the reactor factory ventilation system is polluted.

In one embodiment, the iodine-free exhaust fan comprises a No. 1 exhaust fan and a No. 2 exhaust fan, the blower comprises a No. 1 blower and a No. 2 blower, the first iodine-free exhaust signal comprises a first iodine-free exhaust signal A and a first iodine-free exhaust signal B, and the first air supply signal comprises a first air supply signal A and a first air supply signal B;

the iodine exhaust fan comprises a No. 4 exhaust fan and a No. 5 exhaust fan, and the iodine exhaust state acquisition module sends a first iodine exhaust signal when the No. 4 exhaust fan and the No. 5 exhaust fan are both in a closed state;

the iodine-free exhaust state acquisition module is used for sending a first iodine-free exhaust signal A when the reactor factory building ventilation and ventilation system is in a non-B state and the No. 1 exhaust fan is in a closed state; the iodine-free exhaust state acquisition module is used for sending a first iodine-free exhaust signal B when the reactor factory building ventilation system is in a non-B working condition and the No. 2 exhaust fan is in a closed state;

the air supply state acquisition module is used for sending a first air supply signal A when the reactor factory building ventilation and ventilation system is in a working condition B or the No. 1 air feeder is in a closed state; the air supply state acquisition module is used for sending a first air supply signal B when the reactor factory building ventilation and ventilation system is in a working condition B or the No. 2 air feeder is in a closed state;

the control module is used for respectively controlling the No. 1 exhaust fan, the No. 2 exhaust fan, the No. 1 blower and the No. 2 blower to be in a closed state when receiving the first iodine exhaust signal;

the control module is also used for controlling the blower No. 1 to be in a closed state when receiving a first iodine-free exhaust signal A, and controlling the blower No. 2 to be in a closed state when receiving a first iodine-free exhaust signal B;

the control module is also used for controlling the No. 1 exhaust fan to be in a closed state when receiving the first air supply signal A, and controlling the No. 2 exhaust fan to be in a closed state when receiving the first air supply signal B.

In one embodiment, the control system further comprises a switch module connected to the control module, and the switch module is configured to send a first on signal, a second on signal, a first off signal, and a second off signal to the control module;

the iodine-free exhaust state acquisition module is also used for sending a second iodine-free exhaust signal when the reactor factory building ventilation and ventilation system is in a B state, the iodine-free exhaust fan is in a closed state, or the iodine-free exhaust fan is in an open state;

the control module is further used for controlling the iodine-free exhaust fan to be in an open state when receiving the first opening signal, and the control module is further used for controlling the iodine-free exhaust fan to be in a close state when receiving the first closing signal;

the control module is further used for controlling the air blower to be in an open state when receiving the second opening signal and the second iodine-free exhaust signal, and the control module is further used for controlling the air blower to be in a closed state when receiving the second closing signal.

Among the above-mentioned control system of supplementary factory building ventilation system of nuclear, supplementary factory building ventilation system of nuclear is including being used for to the forced draught blower of iodine pollution district and iodine pollution district air supply, is used for the iodine-free exhaust fan of the wind in iodine pollution district, is used for the iodine exhaust fan that iodine pollution district airs exhaust, control system includes: the iodine exhaust state acquisition module is connected with the iodine exhaust fan and used for acquiring the state of the iodine exhaust fan and sending a first iodine exhaust signal when the iodine exhaust fan is in a closed state; the iodine-free exhaust state acquisition module is respectively connected with the iodine-free exhaust fan and the reactor plant ventilation system and used for acquiring the state of the iodine-free exhaust fan, acquiring whether the reactor plant ventilation system is in a working condition B or not and sending a first iodine-free exhaust signal when the reactor plant ventilation system is in a non-working condition B and the iodine-free exhaust fan is in a closed state; the reactor plant ventilation system comprises a fan, a fan state acquisition module, a first air supply signal acquisition module and a second air supply signal acquisition module, wherein the fan is connected with the fan and the reactor plant ventilation system respectively and used for acquiring the state of the fan; the first negative pressure detection module is respectively connected with an air outlet of the air feeder, the iodine pollution-free area and the iodine pollution area and is used for respectively measuring first negative pressure and second negative pressure between the iodine pollution-free area, the iodine pollution area and the atmosphere; the first negative pressure detection module is also used for controlling and reducing the air supply quantity of the air feeder when the first negative pressure or the second negative pressure is smaller than a first preset value; the second negative pressure detection module is respectively connected with the iodine pollution-free area and is used for measuring a third negative pressure between the iodine pollution-free area and the iodine pollution-free area; the second negative pressure detection module is also used for controlling and reducing the exhaust volume of the iodine-free exhaust fan when the third negative pressure is smaller than a second preset value; the control module is respectively connected with the iodine air exhaust state acquisition module, the iodine-free air exhaust state acquisition module, the air supply state acquisition module, the iodine exhaust fan, the iodine-free exhaust fan and the air supply fan and is used for controlling the air supply fan to be in a closed state when receiving a first iodine air exhaust signal or a first iodine-free air exhaust signal; the control module is also used for controlling the iodine-free exhaust fan to be in a closed state when receiving a first iodine exhaust signal or a first air supply signal; and the working condition B refers to that one unit in the reactor factory ventilation system is in cold shutdown and the reactor factory ventilation system is polluted. The control module in the scheme controls the air feeder in the nuclear auxiliary plant ventilation system to be in the closed state when receiving the first iodine air exhaust signal sent by the iodine air exhaust state acquisition module when the iodine exhaust fan is in the closed state or the reactor plant ventilation system sent by the iodine-free air exhaust state acquisition module is in the non-B working condition and the iodine-free exhaust fan is in the first iodine air exhaust signal in the closed state, controls the iodine-free exhaust fan in the nuclear auxiliary plant ventilation system to be in the closed state when receiving the first iodine air exhaust signal sent by the iodine air exhaust state acquisition module when the iodine exhaust fan is in the closed state or the reactor plant ventilation system sent by the air supply state acquisition module is in the B working condition or the first air supply signal sent by the air feeder when the air feeder is in the closed state, and avoids the situation that the air feeder and the iodine-free exhaust fan in the nuclear auxiliary plant ventilation system are controlled to trip and close by, the problem of abnormal tripping and closing of the air feeder and the iodine-free exhaust fan frequently occurs due to unstable operation of the negative pressure control system, the operation stability of the ventilation system of the nuclear auxiliary factory building is improved, and the consumption ratio of the random first group I0 is reduced. And when the first negative pressure detection module in the scheme measures that the first negative pressure between the iodine-free pollution area and the atmosphere or the second negative pressure between the iodine-free pollution area and the atmosphere is smaller than a first preset value, the air supply quantity of the air feeder is controlled and reduced, when the second negative pressure detection module measures that the third negative pressure between the iodine-free pollution area and the iodine-free pollution area is smaller than a second preset value, the air supply quantity of the air feeder is controlled and reduced, the fluctuation of the first negative pressure or the second negative pressure or the third negative pressure is reduced, and the requirement of the ventilation system of the nuclear auxiliary factory building on the first negative pressure or the second negative pressure or the third negative pressure is ensured within a certain range.

Drawings

FIG. 1 is a flow chart of a method for controlling a ventilation system of a nuclear assisted plant in a first embodiment;

FIG. 2 is a flow chart of a method for controlling a ventilation system of a nuclear auxiliary plant according to a second embodiment;

FIG. 3 is a flow chart of a method for controlling a ventilation system of a nuclear auxiliary plant in a third embodiment;

FIG. 4 is a flow chart of a method of controlling a ventilation system of a nuclear assisted plant in a fourth embodiment;

FIG. 5 is a flow chart of a method of controlling a ventilation system of a nuclear assisted plant in a fifth embodiment;

fig. 6 is a control logic diagram of blower # 1ZV in one embodiment;

FIG. 7 is a logic diagram of the control of ventilator No. 1 004ZV in one embodiment;

FIG. 8 is a block diagram of a control system of a ventilation system of a nuclear assisted plant of an embodiment;

FIG. 9 is a block diagram of a control system for a ventilation system of a nuclear assisted plant in yet another embodiment.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein the term "and/or" includes any and all combinations of one or more of the associated listed items.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. In the description of the present invention, "a plurality" means at least one, e.g., one, two, etc., unless specifically limited otherwise.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on methods or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

The ventilation system of the nuclear auxiliary factory building comprises 3 blowers for blowing air to the iodine pollution-free area and the iodine pollution-free area, 3 iodine exhaust blowers for exhausting air from the iodine pollution-free area and 2 iodine exhaust blowers for exhausting air from the iodine pollution-free area, and a negative pressure detection system for detecting a first negative pressure between the iodine pollution-free area and the atmosphere, a second negative pressure between the iodine pollution-free area and the atmosphere, and a third negative pressure between the iodine pollution-free area and the iodine pollution-free area, wherein the negative pressure control system controls the No. 1 blower to trip off when the first negative pressure or the second negative pressure is less than or equal to 0.46bar (0.46 g) and greater than 0.33bar along with the change of the first negative pressure, the second negative pressure and the third negative pressure, controls the No. 2 blower to trip off when the first negative pressure or the second negative pressure is less than or equal to 0.33bar (0.33bar.g) and greater than 0.20bar, the negative pressure control system controls the No. 3 blower to trip and close; when the negative pressure detection system detects that the third negative pressure is less than or equal to 0.46bar (0.46bar.g) and greater than 0.33bar, the negative pressure control system controls the No. 1 iodine-free exhaust fan to trip and close, when the third negative pressure is less than or equal to 0.33bar (0.33bar.g) and greater than 0.20bar, the negative pressure control system controls the No. 2 iodine-free exhaust fan to trip and close, when the third negative pressure is less than or equal to 0.20bar (0.20bar.g), the negative pressure control system controls the No. 3 iodine-free exhaust fan to trip and close, and when the negative pressure control system of the nuclear auxiliary factory building is unstable, the abnormal tripping and closing faults of the blower and the iodine-free exhaust fan are caused to frequently occur, and the problem of random IO1 is caused.

In one embodiment, as shown in fig. 1, there is provided a control method of a ventilation system of a nuclear-assisted plant including a blower for blowing air to an iodine pollution-free area and an iodine pollution-free area, an iodine-free exhaust fan for exhausting air from the iodine pollution-free area, and an iodine exhaust fan for exhausting air from the iodine pollution-free area, the control method including:

s102, states of an iodine exhaust fan, a blower, an exhaust fan and a reactor factory building ventilation system are monitored respectively.

And S104, respectively controlling the iodine-free exhaust fan and the blower to be in a closed state when the iodine exhaust fan is in the closed state.

In one embodiment, the blower and the iodine free exhaust fan are off 10 seconds after the iodine exhaust fan is off.

And S106, controlling the blower to be in a closed state when the ventilation and ventilation system of the reactor factory building is in a non-B working condition and the iodine-free exhaust fan is in a closed state.

And S108, controlling the iodine-free exhaust fan to be in a closed state when the ventilation and ventilation system of the reactor factory building is in a B working condition or the blower is in a closed state.

And S110, respectively measuring the first negative pressure, the second negative pressure and the third negative pressure.

And respectively measuring a first negative pressure, a second negative pressure and a third negative pressure among the iodine pollution-free area, the iodine pollution area and the atmosphere and the iodine pollution area and the iodine pollution-free area.

And S112, controlling and reducing the air supply quantity of the air supply machine when the first negative pressure or the second negative pressure is smaller than a first preset value.

And S114, controlling and reducing the exhaust volume of the iodine-free exhaust fan when the third negative pressure is smaller than the second preset value.

As shown in fig. 2, in one embodiment, the iodine-free exhaust blower includes a No. 1 exhaust blower and a No. 2 exhaust blower, and the blower includes a No. 1 blower and a No. 2 blower, and the step S104 includes:

s202, when the iodine exhaust fan is in a closed state, controlling the No. 1 exhaust fan and the No. 2 exhaust fan to be in a closed state respectively.

And S204, respectively controlling the No. 1 blower and the No. 2 blower to be in a closed state when the iodine exhaust fan is in the closed state.

The corresponding step S106 includes:

and S206, controlling the No. 1 blower to be in a closed state when the ventilation and ventilation system of the reactor factory building is in a non-B work condition and the No. 1 exhaust fan is in a closed state.

And S208, controlling the No. 2 blower to be in a closed state when the ventilation and ventilation system of the reactor factory building is in a non-B work condition and the No. 2 exhaust fan is in a closed state.

Correspondingly, step S108 includes:

s210, when the reactor factory ventilation system is in the B working condition or the No. 1 blower is in the closed state, controlling the No. 1 exhaust fan to be in the closed state.

And S212, controlling the No. 2 exhaust fan to be in a closed state when the ventilation and ventilation system of the reactor factory is in a B working condition or the No. 2 blower is in a closed state.

As shown in fig. 3, in one embodiment, the iodine-free exhaust blower includes a No. 3 exhaust blower, the blower includes a No. 3 blower, and the step S104 further includes:

and S302, respectively controlling the No. 3 exhaust fan and the No. 3 blower to be in a closed state when the iodine exhaust fan is in the closed state.

In one embodiment, the exhaust blower # 3 is a back-up iodine-free exhaust blower and the blower # 3 is a back-up blower.

Step S106 further includes:

s304, when the reactor factory ventilation system is in a non-B working condition and the No. 3 exhaust fan is in a closed state, controlling the No. 3 blower to be in a closed state.

Step S108 further includes:

and S306, controlling the No. 3 exhaust fan to be in a closed state when the ventilation and ventilation system of the reactor factory building is in a B working condition or the No. 3 blower is in a closed state.

In one embodiment, the iodine exhaust fan comprises a No. 4 exhaust fan and a No. 5 exhaust fan, and the step of respectively controlling the iodine-free exhaust fan and the air feeder to be in the off state when the iodine exhaust fan is in the off state comprises the following steps:

In one embodiment, exhaust blower # 5 is a back-up iodine exhaust blower.

As shown in fig. 4, in one embodiment, the control method further includes:

s402, controlling the iodine-free exhaust fan to be in an opening state according to the first opening signal.

And when receiving a first opening signal for controlling the iodine-free exhaust fan to be opened, controlling the iodine-free exhaust fan to be in an opening state.

In one embodiment, the first turn-on signal is a turn-on signal output by an in-situ switch of the iodine-free exhaust fan.

And S404, controlling the blower to be in an opening state.

When the reactor factory ventilation system is in a B condition, the iodine-free exhaust fan is in a closed state, or the iodine-free exhaust fan is in an open state, and a second opening signal for controlling the blower to be opened is received, the blower is controlled to be in the open state.

In one embodiment, the second turn-on signal is a turn-on signal output by a blower on-site switch.

And S406, controlling the iodine-free exhaust fan to be in a closed state according to the first closing signal.

And when receiving a first closing signal for controlling the iodine-free exhaust fan to be closed, controlling the iodine-free exhaust fan to be in a closing state.

In one embodiment, the first closing signal is a closing signal output by an in-situ switch of the iodine-free exhaust fan.

And S408, controlling the blower to be in a closed state according to the second closing signal.

In one embodiment, the second off signal is an off signal output by an on-site switch of the blower.

In one embodiment, step S402 or step S406 further includes, before: controlling the iodine-free exhaust fan to reset; step S404 or step S408 is preceded by: and controlling the blower to reset.

In one embodiment, said first predetermined value and said second predetermined value are both 1.035bar (i.e. 1.035 bar.g).

As shown in fig. 5, in one embodiment, the control method further includes:

s502, when the first negative pressure or the second negative pressure is less than or equal to 0.59 bar, a first pressure difference alarm signal is sent out.

And S504, when the third negative pressure is less than or equal to 0.59 bar, sending a second differential pressure alarm signal.

In one embodiment, the control method further comprises: when the iodine-free exhaust fan is in an open state, performing first light display when the iodine-free exhaust fan is in the open state, for example, performing red light display by using a three-color display lamp on the iodine-free exhaust fan, and displaying that the iodine-free exhaust fan is in the open state on a KIT system (centralized data processing system); when the iodine-free exhaust fan is in the closed state, the second light display that the iodine-free exhaust fan is in the closed state is carried out, for example, the three-color display lamp on the iodine-free exhaust fan carries out green light display.

In one embodiment, the control method further comprises: when the blower is in an on state, performing a third light display when the blower is in the on state, for example, performing red light display by a three-color display lamp on the blower, and displaying that the blower is in the on state on a KIT system (centralized data processing system); when the blower is in the off state, a second light display is performed when the blower is in the off state, for example, a three-color display lamp on the blower performs a green light display.

In one embodiment, the iodine-free exhaust fan comprises No. 1 exhaust fan 004ZV, No. 2 exhaust fan 005ZV, No. 3 exhaust fan 006ZV, the blower comprises No. 1 blower 001ZV, No. 2 blower 002ZV, No. 3 blower 003ZV, and the iodine exhaust fan comprises No. 4 exhaust fan 007ZV, No. 5 exhaust fan 008 ZV. Taking blower # 1 001ZV and exhaust fan # 1 004ZV as an example, as shown in fig. 6, the conditions for controlling blower # 1 001ZV to be in the off state include: the iodine exhaust fans 007ZV and 008ZV are both in a closed state, or the reactor factory building ventilation system is in a non-B working condition (NOT CONFIG.B) and the No. 1 exhaust fan 004ZV is in a closed state, or the No. 1 blower 001ZV is switched on locally to output a second closing signal; the conditions for controlling the blower # 1 001ZV to be in the on state include: the reactor building ventilation and ventilation system is in a B working condition (CONFIG. B) and the No. 1 exhaust fan 004ZV is in a closed state, or the No. 1 exhaust fan 004ZV is in an open state, and receives that the No. 1 blower 001ZV local switch outputs a second opening signal. When blower 001ZV 1 is in the on state, the 001LA light alarm displays red, and when blower 001ZV 1 is in the on state, the 001LA light alarm displays green. The blower 001Z 1 can be controlled by the second off signal or the second on signal only after the blower 001Z 1 is reset.

As shown in fig. 7, the conditions for controlling the No. 1 exhaust fan 004ZV in the closed state include: the iodine exhaust fans 007ZV and 008ZV are both in a closed state, or a reactor factory building ventilation system is in a B working condition (CONFIG.B), or a No. 1 blower 001ZV is in a closed state, or a No. 1 exhaust fan 004ZV local switch outputs a first closing signal; the conditions for controlling the No. 1 exhaust fan 004ZV to be in the on state include: and receiving a first opening signal output by a local switch of the No. 1 exhaust fan 004 ZV. When No. 1 exhaust fan 004ZV is in the on state, 003LA light alarm display is red, and when No. 1 exhaust fan 004ZV is in the on state, 003LA light alarm display is green. The exhaust fan 004ZV can be controlled by the first close signal or the first open signal after the exhaust fan 004ZV 1 is reset.

When blower # 1 001ZV is on, the KIT system (centralized data processing system) displays that blower # 1 001ZV is on. When the exhaust fan 004ZV No. 1 is in the on state, the exhaust fan 004ZV No. 1 is displayed in the on state on the KIT system (centralized data processing system).

As shown in fig. 8, in one embodiment, there is provided a control system of a nuclear auxiliary plant ventilation system including a blower 102 for blowing air to an iodine free and iodine contaminated area, an iodine free exhaust fan 104 for exhausting air from the iodine free contaminated area, and an iodine exhaust fan 106 for exhausting air from the iodine contaminated area, the control system including:

the iodine exhaust state acquiring module 108 is connected to the iodine exhaust fan 106, and configured to acquire a state of the iodine exhaust fan 106 and send a first iodine exhaust signal when the iodine exhaust fan 106 is in a closed state.

The iodine-free exhaust state acquisition module 110 is respectively connected with the iodine-free exhaust fan 104 and a reactor building ventilation system (EBA system) and is used for acquiring the state of the iodine-free exhaust fan 104, and the iodine-free exhaust state acquisition module 110 is also used for acquiring whether the reactor building ventilation system is in a B working condition or not and sending a first iodine-free exhaust signal when the reactor building ventilation system is in a non-B working condition and the iodine-free exhaust fan 104 is in a closed state; the working condition B (CONFIG.B) refers to that one unit in the ventilation system of the reactor factory is in cold shutdown and the ventilation system of the reactor factory is polluted.

The air supply state acquisition module 112 is connected to the air supply device 102 and the reactor building ventilation system, and is configured to acquire a state of the air supply device 102, and the air supply state acquisition module 112 is further configured to acquire whether the reactor building ventilation system is in a B operating condition, and send a first air supply signal when the reactor building ventilation system is in the B operating condition or the air supply device 102 is in a closed state.

A first negative pressure detection module 114, connected to the blower 102, the air outlet of the blower 102, the iodine pollution-free area, and the iodine pollution area, respectively, for measuring a first negative pressure and a second negative pressure between the iodine pollution-free area, and the atmosphere, respectively; the first negative pressure detecting module 114 is further configured to control to reduce the air output of the blower 102 when the first negative pressure or the second negative pressure is smaller than a first preset value.

A second negative pressure detection module 116, which is respectively connected with the iodine-free exhaust fan 104, the iodine-free polluted area and the iodine-polluted area, and is used for measuring a third negative pressure between the iodine-polluted area and the iodine-free polluted area; the second negative pressure detecting module 116 is further configured to control and reduce the exhaust volume of the iodine-free exhaust fan 104 when the third negative pressure is smaller than a second preset value.

The control module 118 is respectively connected with the iodine exhaust state acquisition module 108, the iodine-free exhaust state acquisition module 110, the air supply state acquisition module 112, the iodine exhaust fan 106, the iodine-free exhaust fan 104 and the air supply fan 102; the control module 118 is configured to control the blower 102 to be in the off state when receiving the first iodine exhaust signal or the first iodine-free exhaust signal; the control module 118 is further configured to control the iodine-free exhaust fan 104 to be in a closed state when receiving the first iodine exhaust signal or the first air supply signal.

In one embodiment, the control module further comprises an electrical switch, and the control module controls the blower or the iodine-free exhaust fan to be in a closed state through the electrical switch.

As shown in fig. 9, in one embodiment, the iodine free exhaust blower 104 includes a number 1 exhaust blower 004ZV, a number 2 exhaust blower 005ZV, and the blower 102 includes a number 1 blower 001ZV, a number 2 blower 002ZV, the first iodine free exhaust signal includes a first iodine free exhaust signal a and a first iodine free exhaust signal B, and the first blower signal includes a first blower signal a and a first blower signal B.

The iodine exhaust fan 106 includes a No. 4 exhaust fan 007ZV and a No. 5 exhaust fan 008ZV, and the iodine exhaust state acquisition module 108 is configured to send a first iodine exhaust signal when the No. 4 exhaust fan and the No. 5 exhaust fan are both in a closed state.

The iodine-free exhaust state acquisition module 110 is configured to send a first iodine-free exhaust signal a when a reactor building ventilation and ventilation system (EBA system) is in a non-B operating condition and the exhaust fan No. 1 004ZV is in a closed state; the iodine-free exhaust state acquisition module 110 is configured to send a first iodine-free exhaust signal B when the reactor building ventilation system is in a non-B operating condition and the exhaust fan 005ZV is in a closed state.

The air supply state acquisition module 112 is used for sending a first air supply signal a when the reactor building ventilation system is in a B working condition or the blower 001ZV No. 1 is in a closed state; the air supply state acquiring module 112 is configured to send a first air supply signal B when the reactor building ventilation system is in the B operating condition or the No. 2 blower 002ZV is in the off state.

The control module 118 is configured to control the No. 1 exhaust fan 004ZV, the No. 2 exhaust fan 005ZV, the No. 1 blower 001ZV, and the No. 2 blower 002ZV to be in an off state, respectively, when receiving the first iodine exhaust signal. The control module 118 is further configured to control the blower 001ZV 1 to be in the off state when receiving the first iodine-free exhaust signal a, and control the blower 002ZV 2 to be in the off state when receiving the first iodine-free exhaust signal B. The control module 118 is further configured to control the exhaust fan 004ZV No. 1 to be in the closed state when receiving the first air supply signal a, and control the exhaust fan 005ZV No. 2 to be in the closed state when receiving the first air supply signal B.

In one embodiment, the iodine free exhaust fan 104 further comprises an exhaust fan 006ZV No. 3, the blower 102 further comprises a blower fan 003ZV No. 3, the first iodine free exhaust signal further comprises a first iodine free exhaust signal C, and the first blower signal further comprises a first blower signal C.

The iodine-free exhaust state acquisition module 110 is configured to send a first iodine-free exhaust signal C when an air exchange ventilation system (EBA system) of a reactor building is in a non-B operating condition and the exhaust fan 006ZV of No. 3 is in a closed state; the air supply state acquiring module 112 is configured to send a first air supply signal C when the reactor building ventilation system is in the B operating condition or the blower 003ZV is in the off state.

The control module 118 is configured to control the exhaust fan 006ZV of the No. 3 and the blower 003ZV of the No. 3 to be in an off state when receiving the first iodine exhaust signal. The control module 118 is further configured to control the blower 003ZV 3 to be in the off state when receiving the first iodine-free exhaust signal C, and the control module 118 is further configured to control the blower 006ZV 3 to be in the off state when receiving the first supply signal C.

In one embodiment, the control system further includes a blower bypass air volume adjusting damper 018VAR connected to the blower 102 and the first negative pressure detection module 114, respectively, an iodine-free blower bypass air volume adjusting damper 019VAR connected to the iodine-free blower 104 and the second negative pressure detection module, respectively; when the first negative pressure or the second negative pressure is smaller than a first preset value, the first negative pressure detection module 114 controls to reduce the air volume of the blower 102 through the blower bypass air volume adjusting damper 018VAR, and when the third negative pressure is smaller than a second preset value, the second negative pressure detection module 116 controls to reduce the air volume of the iodine-free exhaust fan 104 through the iodine-free exhaust fan bypass air volume adjusting damper 019 VAR.

In one embodiment, the control system further comprises blower outlet air volume adjusting barriers 014VAR and 015VAR, connected in parallel between blower 102 and the iodine contaminated area, blower outlet air volume adjusting barriers 016VAR and 017VAR, connected in parallel between blower 102 and the iodine contaminated area, iodine ventilator inlet air volume adjusting barrier 044VAR, connected between the iodine contaminated area and iodine ventilator 106, and iodine ventilator inlet air volume adjusting barrier 040VAR, connected between the iodine contaminated area and iodine ventilator 104.

In one embodiment, the control system further includes an in-situ pressure differential gauge 018LP for monitoring the blower outlet pressure differential, i.e., the total supply air of the nuclear auxiliary plant ventilation system, versus the positive pressure differential between the NX (nuclear auxiliary) plant 11 meter hall environment, and an in-situ pressure differential gauge 019LP for monitoring the iodine-free blower inlet pressure differential, i.e., the negative pressure differential between the iodine-free blower manifold inlet versus the NX plant 11 meter hall environment.

In one embodiment, the control system further comprises an iodine pollution area simulation box connected with the outlet of the air blower, the inlet of the iodine exhaust fan, the first negative pressure detection module and the second negative pressure detection module respectively, and the iodine pollution area simulation box is used for simulating negative pressure between the iodine pollution area and the atmosphere; the control system also comprises an iodine-free pollution area simulation box which is respectively connected with the outlet of the air feeder and the inlet of the iodine-free exhaust fan, and the iodine-free pollution area simulation box is used for simulating negative pressure between the iodine-free pollution area and the atmosphere.

In one embodiment, the first negative pressure detecting module 114 includes a negative pressure sensor 001ZL connected to the iodine pollution free zone simulation box for measuring a first negative pressure between the iodine pollution free zone and the atmosphere, a negative pressure sensor 002ZL connected to the iodine pollution zone simulation box for measuring a second negative pressure between the iodine pollution zone and the atmosphere, a low pressure selector 001ZL connected to the negative pressure sensors 001MP and 002ZL, respectively, the low pressure selector 001ZL being configured to compare the first negative pressure measured by the 001MP with the second negative pressure measured by the 002MP, and output a lower pressure signal of the first negative pressure and the second negative pressure to the low pressure selector 002ZL, the low pressure selector 002ZL comparing the pressure signal output by the low pressure selector 001 with the signal (i.e., the first predetermined value) output by the manual valve 250VA, and when the pressure signal output by the low pressure selector ZL 001 is smaller than the first predetermined value, the amount of air supplied from the blower is reduced by the blower bypass air volume adjusting damper 018VAR control connected to the low pressure selector 002 ZL.

In one embodiment, the first negative pressure detection module 114 includes a first differential pressure alarm module 202 connected to the low pressure selector 001ZL and the low pressure selector 002ZL, respectively, and the first differential pressure alarm module 202 is configured to send a first differential pressure alarm signal when the first negative pressure or the second negative pressure is less than or equal to 0.59 bar.

In one embodiment, the first differential pressure warning module 202 includes a low differential pressure warning switch 007SP and a low differential pressure warning switch 008SP connected in parallel.

In one embodiment, the second negative pressure detecting module 116 includes a negative pressure sensor 003MP connected to the iodine pollution-free area simulation box, the iodine pollution area simulation box, the first negative pressure detecting module, and the second negative pressure detecting module, respectively, for measuring a third negative pressure between the iodine pollution area and the iodine pollution-free area, and a low pressure selector 003ZL connected to the negative pressure sensor 003MP, where the low pressure selector 003ZL is configured to compare the third negative pressure measured by the third negative pressure sensor 003MP with a signal (i.e., a second preset value) output by the manual valve VA 251, and when the third negative pressure is smaller than the second preset value, the air supply amount of the iodine-free exhaust fan is reduced by controlling the iodine-free exhaust fan bypass air volume adjusting damper 019VAR connected to the low pressure selector 003 ZL.

In one embodiment, the second negative pressure detecting module 116 includes a second differential pressure warning module 204 connected to the negative pressure sensor 003MP and the low pressure selector ZL 003, respectively, and the second differential pressure warning module 204 is configured to issue a second differential pressure warning signal when the third negative pressure is less than or equal to 0.59 bar.

In one embodiment, the second differential pressure alarm module 204 includes a low differential pressure alarm switch 012SP and a low differential pressure alarm switch 013SP connected in parallel.

In one embodiment, the control system further comprises a switch module 120 connected to the control module 118, wherein the switch module 120 is configured to send a first on signal, a second on signal, a first off signal, and a second off signal to the control module 118.

The iodine-free exhaust state obtaining module 118 is further configured to send a second iodine-free exhaust signal when the reactor building ventilation and ventilation system is in the B state, the iodine-free exhaust fan 104 is in the off state, or the iodine-free exhaust fan 104 is in the on state.

The control module 118 is further configured to control the iodine-free exhaust fan 104 to be in an on state when receiving the first on signal, and the control module 118 is further configured to control the iodine-free exhaust fan 104 to be in an off state when receiving the first off signal.

The control module 118 is further configured to control the blower 102 to be in an on state when receiving the second on signal and the second iodine-free exhaust signal, and the control module 118 is further configured to control the blower to be in an off state when receiving the second off signal.

In one embodiment, the switch module 120 is further configured to send a first reset signal and a second reset signal; the control module 118 is further configured to control the iodine-free exhaust fan 104 to reset when receiving the first reset signal; the control module 118 is further configured to control the blower 102 to reset when receiving the second reset signal; after the iodine-free exhaust fan 104 is reset, the control module 118 controls the iodine-free exhaust fan 104 through the first opening signal and the first closing signal, and after the blower 102 is reset, the control module 118 controls the blower 102 through the second opening signal and the second closing signal.

In one embodiment, the switch module 120 includes a first switch module for sending a first on signal and a first off signal, and a second switch module for sending a second on signal and a second off signal, the first switch module being an iodine-free blower on-site switch, and the second switch module being a blower on-site switch.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A control method of a ventilation system of a nuclear auxiliary factory building, wherein the ventilation system of the nuclear auxiliary factory building comprises a blower for supplying air to an iodine-free pollution area and an iodine-free pollution area, an iodine-free exhaust fan for exhausting air from the iodine-free pollution area and an iodine exhaust fan for exhausting air from the iodine-free pollution area, and the control method comprises the following steps:

2. The control method according to claim 1, wherein the iodine-free exhaust fan comprises a No. 1 exhaust fan and a No. 2 exhaust fan, the blower comprises a No. 1 blower and a No. 2 blower, and the step of respectively controlling the iodine-free exhaust fan and the blower to be in the off state when the iodine-free exhaust fan is in the off state comprises:

when the iodine exhaust fan is in a closed state, controlling the No. 1 exhaust fan and the No. 2 exhaust fan to be in a closed state respectively;

correspondingly, reactor factory building ventilation system is in non-B operating mode just when the iodine-free exhaust fan is in the off-state, control the step that the forced draught blower is in the off-state includes:

when the reactor factory building ventilation system is in a non-B working condition and the No. 1 exhaust fan is in a closed state, controlling the No. 1 blower to be in a closed state;

when the reactor factory building ventilation system is in a non-B working condition and the No. 2 exhaust fan is in a closed state, controlling the No. 2 blower to be in a closed state;

correspondingly, reactor factory building ventilation system is in B operating mode or when the forced draught blower is in the off-state, control the step that iodine-free exhaust fan is in the off-state includes:

when the reactor factory building ventilation system is in a working condition B or the No. 1 blower is in a closed state, controlling the No. 1 exhaust fan to be in a closed state;

reactor factory building ventilation system is in B operating mode or when No. 2 blowers are in the off-state, control No. 2 exhaust fans are in the off-state.

3. The control method of claim 2, wherein the iodine free exhaust fan comprises a No. 3 exhaust fan, the blower comprises a No. 3 blower, and the step of separately controlling the iodine free exhaust fan and the blower to be in an off state when the iodine free exhaust fan is in an off state further comprises:

when the iodine exhaust fan is in a closed state, the No. 3 exhaust fan and the No. 3 blower are respectively controlled to be in a closed state;

reactor factory building ventilation system is in non B operating mode just when the iodine-free exhaust fan is in the off-state, control the forced draught blower is in the step of off-state and still includes:

when the reactor factory building ventilation system is in a non-B working condition and the No. 3 exhaust fan is in a closed state, controlling the No. 3 blower to be in a closed state;

reactor factory building ventilation system is in B operating mode or when the forced draught blower is in the closed condition, control the step that iodine-free exhaust fan is in the closed condition still includes:

reactor factory building ventilation system is in B operating mode or when No. 3 blowers are in the off-state, control No. 3 exhaust fans are in the off-state.

4. The control method of claim 1, wherein the iodine exhaust fan comprises a No. 4 exhaust fan and a No. 5 exhaust fan, and the step of controlling the iodine-free exhaust fan and the blower to be in the off state respectively when the iodine exhaust fan is in the off state comprises:

and when the No. 4 exhaust fan and the No. 5 exhaust fan are both in the closed state, the iodine-free exhaust fan and the air feeder are respectively controlled to be in the closed state.

5. The control method according to claim 1, characterized by further comprising:

when the reactor plant ventilation and ventilation system is in a working condition B, the iodine-free exhaust fan is in a closed state, or the iodine-free exhaust fan is in an open state, and a second opening signal for controlling the blower to be opened is received, the blower is controlled to be in the open state;

and controlling the blower to be in a closed state when receiving a second closing signal for controlling the blower to be closed.

6. The control method of claim 5, wherein before controlling the iodine free exhaust fan to be in an on state or controlling the iodine free exhaust fan to be in an off state when receiving a first off signal for controlling the iodine free exhaust fan to be off, the method further comprises: controlling the iodine-free exhaust fan to reset;

the control the forced draught blower is in the on state or when receiving the second shut off signal of control the forced draught blower is closed, control the forced draught blower and be in before the off state still include: and controlling the blower to reset.

7. Control method according to claim 1, characterized in that said first preset value and said second preset value are both 1.035bar.

8. The control method according to claim 1, characterized by further comprising:

and when the third negative pressure is less than or equal to 0.59 bar, sending a second pressure difference alarm signal.

9. The utility model provides a control system of factory building ventilation system is assisted to nuclear, factory building ventilation system is assisted including being used for to the forced draught blower of no iodine pollution district and iodine pollution district air supply, be used for the no iodine exhaust fan of no iodine pollution district air exhaust, be used for the iodine exhaust fan of iodine pollution district air exhaust, its characterized in that, control system includes:

the reactor plant ventilation system comprises a reactor plant ventilation system, an air supply state acquisition module and a control module, wherein the reactor plant ventilation system is used for ventilating a reactor plant, the air supply state acquisition module is respectively connected with the air supply device and the reactor plant ventilation system and is used for acquiring the state of the air supply device, the air supply state acquisition module is also used for acquiring whether the reactor plant ventilation system is in a working condition B or not and sending a first air supply signal when the reactor plant ventilation system;

the first negative pressure detection module is respectively connected with the air feeder, the air outlet of the air feeder, the iodine pollution-free area and the iodine pollution area and is used for respectively measuring first negative pressure and second negative pressure between the iodine pollution-free area, the iodine pollution area and the atmosphere; the first negative pressure detection module is also used for controlling and reducing the air supply quantity of the air feeder when the first negative pressure or the second negative pressure is smaller than a first preset value;

the control module is respectively connected with the iodine air exhaust state acquisition module, the iodine-free air exhaust state acquisition module, the air supply state acquisition module, the iodine exhaust fan, the iodine-free exhaust fan and the air supply fan, and is used for controlling the air supply fan to be in a closed state when receiving the first iodine air exhaust signal or the first iodine-free air exhaust signal; the control module is also used for controlling the iodine-free exhaust fan to be in a closed state when receiving the first iodine exhaust signal or the first air supply signal;

10. The control system according to claim 9, characterized in that said first preset value and said second preset value are both 1.035bar.

11. The control system of claim 9, wherein the iodine free exhaust blower comprises a No. 1 exhaust blower, a No. 2 exhaust blower, the blower comprises a No. 1 blower, a No. 2 blower, the first iodine free exhaust signal comprises a first iodine free exhaust signal a and a first iodine free exhaust signal B, the first supply signal comprises a first supply signal a and a first supply signal B;

the iodine exhaust fan comprises a No. 4 exhaust fan and a No. 5 exhaust fan, and the iodine exhaust state acquisition module sends the first iodine exhaust signal when the No. 4 exhaust fan and the No. 5 exhaust fan are both in a closed state;

the iodine-free exhaust state acquisition module is used for sending a first iodine-free exhaust signal A when the reactor plant ventilation and ventilation system is in a non-B working condition and the No. 1 exhaust fan is in a closed state; the iodine-free exhaust state acquisition module is used for sending a first iodine-free exhaust signal B when the reactor plant ventilation and ventilation system is in a non-B working condition and the No. 2 exhaust fan is in a closed state;

the control module is further used for controlling the blower No. 1 to be in a closed state when receiving the first iodine-free exhaust signal A, and controlling the blower No. 2 to be in a closed state when receiving the first iodine-free exhaust signal B;

12. The control system of claim 9, further comprising a switch module coupled to the control module, the switch module configured to send a first on signal, a second on signal, a first off signal, a second off signal to the control module;

the iodine-free exhaust state acquisition module is also used for sending a second iodine-free exhaust signal when the reactor factory building ventilation and ventilation system is in a working condition B, the iodine-free exhaust fan is in a closed state, or the iodine-free exhaust fan is in an open state;