Ship evaporator sewage discharge control system and control method thereof

Abstract

The invention relates to a ship evaporator sewage discharge control system and a control method thereof.The ship evaporator sewage discharge control system comprises an evaporation sewage discharge device which comprises a steam generator, a sewage discharge pipeline of the steam generator is provided with a water level adjusting valve, an outlet of the sewage discharge pipeline is connected with a discharge evaporator, and the discharge evaporator is connected with a steam adjusting valve; a water quality sensor for detecting salt in water is arranged in the steam generator, and a water level sensor for detecting the liquid level is arranged in the discharge evaporator; and the pollution discharge control device comprises a control unit, a water level display unit, a salt content display unit, a first valve position display unit and a second valve position display unit. A water level signal of the discharge evaporator and a water quality salt content signal of the steam generator are introduced to serve as double impulses of the control system, through calculation of a self-adaptive control mode, logic correction comprehensive superposition and the like, results are output to act on the water level adjusting valve and the steam adjusting valve, and effective control over the sewage discharging system is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship control systems, and particularly relates to a ship evaporator blowdown water control system and a control method thereof. BACKGROUND

[0002] An evaporator device of a ship power system is provided with a blowdown water pipeline, and the main purpose is to remove salt and the like in boiler water. A blowdown evaporator connected with the blowdown water pipeline is used to receive blowdown water, and after heating and evaporation, part of the blowdown water can be recovered to reduce the loss of steam-water circulating working medium. A water level control system of the blowdown evaporator is used to maintain the water level of the blowdown evaporator within a specified range, so as to ensure the safe and normal operation of the blowdown evaporator and the evaporator device, and thus meet the task requirements of the blowdown water of the evaporator device.

[0003] The water level control system of the blowdown evaporator takes the water level of the blowdown evaporator as the only controlled impulse, and an intelligent controller of the water level control system controls the action of a water level regulating valve installed on the blowdown water pipeline according to the conventional PID logical operation of the collected water level signal, changes the blowdown water quantity, and controls the water level of the blowdown evaporator within the specified value range.

[0004] However, the existing scheme has the following disadvantages. In use, the monitored blowdown water salt content display value is often too high and exceeds the standard. When the boiler water salt content is greater than the specified value, the blowdown water quantity should be increased, and the opening degree of the water level regulating valve on the blowdown water pipeline should be increased. However, the current control system does not introduce the boiler water salt content signal, and when the boiler water salt content of the evaporator device continuously exceeds the standard, only the heating steam stop valve of the blowdown evaporator or the emergency blowdown can be operated on site, which affects the efficiency and control effect of the blowdown system.

[0005] With the increasing requirements for the performance of the process system and the automation level of the control system, the blowdown water control system should be optimized and improved. Meanwhile, the water level control system of the blowdown evaporator uses a single conventional PID logical algorithm without characteristics and pertinence, which inevitably leads to control lag, poor reactivity and followability of the control system, and even oscillation instability, reduces the efficiency of the blowdown water system, and affects the system control effect.

[0006] In addition, the existing water level control method of the blowdown evaporator lacks trend suppression within the specified range of the controlled quantity, lacks fault self-adaptive recovery capability of the sensor and the regulating valve, and can only cancel the automatic control of the control system when a fault occurs, and continues to perform the control task after the fault is eliminated. SUMMARY

[0007] Embodiments of the present application provide a ship evaporator blowdown water control system and a control method thereof, to solve the problem in the prior art that the current control system does not introduce a boiler water salt content signal, and when the boiler water salt content of the evaporator continuously exceeds the standard, only the heating steam stop valve of the evaporator or the emergency blowdown can be operated locally, which affects the efficiency and control effect of the blowdown system.

[0008] In a first aspect, the embodiments of the present application provide a ship evaporator blowdown water control system, comprising: An evaporator blowdown device, which comprises a steam generator, a water level regulating valve is installed on a blowdown water pipeline of the steam generator, an outlet of the blowdown water pipeline is connected with a blowdown evaporator, the blowdown evaporator is connected with a steam regulating valve, a water quality sensor for detecting water quality salt content is arranged in the steam generator, and a water level sensor for detecting liquid level is arranged in the blowdown evaporator; A blowdown control device, which comprises a control unit, a water level display unit connected with the water level sensor, a salt content display unit connected with the water quality sensor, a first valve position display unit connected with the water level regulating valve, and a second valve position display unit connected with the steam regulating valve, wherein the water level regulating valve, the steam regulating valve, the water level display unit, the salt content display unit, the first valve position display unit and the second valve position display unit are connected with the control unit.

[0009] In some embodiments, the blowdown control device further comprises a selected control operation unit connected with the control unit, the selected control operation unit comprises a selected controller and an operator, and the selected controller is used to control the water level regulating valve and the steam regulating valve to be in a remote control mode or an automatic mode. The operator comprises a first operator and a second operator, and the first operator and the second operator are respectively connected with the water level regulating valve and the steam regulating valve to control the remote control of the water level regulating valve and the steam regulating valve.

[0010] In some embodiments, the control unit comprises a control display unit, an acquisition unit, a fault judgment unit, a control mode operation unit, an adaptive operation database unit and a control output unit, the acquisition unit is used to acquire selected control operation signals, water level signals, salt content signals and valve position feedback signals, and transmit the acquired signals to the control display unit and the fault judgment unit; The control unit judges the salt content signal value, outputs the corresponding opening degree of the steam regulating valve according to different threshold values of the salt content, and gives an empirical opening degree in a normal range, the control mode operation unit performs data calculation according to the corresponding control mode of the water level, and transmits the valve position opening degree control result of the water level regulating valve and the valve position opening degree assignment result of the steam regulating valve to the control output unit, and the control output unit is connected with the water level regulating valve and the steam regulating valve to complete the control of the water level regulating valve and the steam regulating valve. The fault judging unit judges the fault mode and sends it to the adaptive operation database unit, the adaptive operation database unit combines and extracts the fault mode, and adaptively selects the control mode according to the fault mode, the fault mode including water quality sensor fault, water level sensor fault, water level regulating valve and steam regulating valve fault, and malfunction signal caused by interference signal.

[0011] In some embodiments: the control mode operation of the control unit adopts adaptive logic control algorithm and human-like intelligent control; The logic control algorithm judges the inertia change direction and trend of the controlled quantity according to the deviation, first-order derivative and second-order derivative of the controlled quantity when the water level exceeds the specified range, and gives the action value of the corresponding water level regulating valve or steam regulating valve, wherein the valve action direction is opposite when the water level exceeds the upper limit and the lower limit, and the adaptive mode operation is performed through the correction coefficient of the identifier; The human-like intelligent control maximally identifies the process change trend within the specified water level value range to perform conscious reasoning, simulates the operation of the operator, and controls the deviation of the controlled object within the stable range.

[0012] In some embodiments: the water level regulating valve is connected with a first electric actuating unit, the first electric actuating unit is connected with the first valve position display unit and the water level regulating valve, and the first electric actuating unit is connected with the control unit and the selected control operation unit, for receiving the current driving signal sent by the control unit and the on-off driving signal sent by the selected control operation unit.

[0013] In some embodiments: the first electric actuating unit includes a first remote control unit, a first switch control unit and a first valve position feedback unit; the first remote control unit is used to receive the analog control signal of the control unit and drive the water level regulating valve to operate; The first switch control unit is used to receive the on-off signal of the selected control operation unit and operate the water level regulating valve; and the first valve position feedback unit is connected to the control unit through the first valve position display unit, for sending the position signal of the water level regulating valve to the control unit.

[0014] In some embodiments: the steam regulating valve is connected with a second electric actuating unit, the second electric actuating unit is connected with the second valve position display unit and the steam regulating valve, and the second electric actuating unit is connected with the control unit and the selected control operation unit, for receiving the current driving signal sent by the control unit and the on-off driving signal sent by the selected control operation unit.

[0015] In some embodiments: the second electric actuating unit comprises a second remote control unit, a second switch control unit and a second valve position feedback unit; the second remote control unit is configured to receive analog control signals of the control unit and drive the steam regulating valve to operate; the second switch control unit is configured to receive switch signals of the selected control operation unit and operate the steam regulating valve; and the second valve position feedback unit is connected to the control unit through a second valve position display unit and configured to send position signals of the steam regulating valve to the control unit.

[0016] In some embodiments: the first switch control unit is connected to the first operator, and the second switch control unit is connected to the second operator.

[0017] The second aspect of the embodiments of the present application provides a ship evaporator blowdown water control method, characterized in that the method uses the ship evaporator blowdown water control system of any of the above embodiments, and the method comprises: S101: system power-on and initialization: performing parameter initialization operation to make the control unit, water level sensor, water quality sensor, water level display unit, salt content display unit, first valve position display unit and second valve position display unit in the system in working state; S102: signal acquisition: the control unit acquires selected control operation signals, water level signals, salt content signals and valve position feedback signals, and transmits the acquired signals to the control display unit and fault judgment unit; S103: judging the control mode of the system, if the selected operator is in remote control mode, the operator controls the opening degree of the water level regulating valve and the steam regulating valve in remote control mode according to the water level display unit, the salt content display unit, the first valve position display unit and the second valve position display unit; S104: if the selected operator is in automatic mode, the water level regulating valve and the steam regulating valve are put into automatic control, and the control unit selects water level and salt content as controlled variables; S105: adopting salt content grading setting value judgment, corresponding opening degrees of the steam regulating valve are given for three different value ranges of less than the second threshold value, greater than the second threshold value and greater than the third threshold value; S106: judging whether the water quality sensor is faulty, if yes, selecting corresponding fault mode and correction coefficient to lock the operation result and output to the steam regulating valve; S107: judging whether the water level sensor is faulty, if yes, selecting corresponding fault mode and correction coefficient to control operation, locking the operation result and outputting to the water level regulating valve, if not, entering S108; S108: judging whether the blowdown evaporator water level is higher than the specified value, if yes, directly entering S109, if not, turning to S110; S109: Selecting a corresponding control mode and combining self-adaptation for logical operation, outputting a signal for closing the water level regulating valve; S110: When judging whether the water level is lower than a specified value, if yes, directly entering step 111; if not, turning to S112; S111: Selecting a corresponding control mode and combining self-adaptation for logical operation, outputting a signal for opening the water level regulating valve; S112: Selecting a corresponding control mode, outputting a fine-tuning signal according to the deviation, so that the water level regulating valve can output a water level regulating valve opening degree signal for returning the water level to a specified position in advance when approaching a limit value; S113: Judging whether the water level regulating valve and the steam regulating valve position feedback input are abnormal, if yes, locking the current valve position output signal; S114: Returning after the operation result is output to the water level regulating valve and the steam regulating valve.

[0018] The technical scheme provided by the application has the following beneficial effects: The ship evaporator blowdown water control system and the control method thereof provided by the embodiment of the application have the following beneficial effects: the ship evaporator blowdown water control system is provided with an evaporation blowdown device, which includes a steam generator, a water level regulating valve installed on a blowdown water pipeline of the steam generator, a blowdown evaporator connected to an outlet of the blowdown water pipeline, a steam regulating valve connected to the blowdown evaporator, a water quality sensor for detecting water quality salt content arranged in the steam generator, and a water level sensor for detecting liquid level arranged in the blowdown evaporator; the blowdown control device includes a control unit, a water level display unit connected to the water level sensor, a salt content display unit connected to the water quality sensor, a first valve position display unit connected to the water level regulating valve, and a second valve position display unit connected to the steam regulating valve; the water level regulating valve, the steam regulating valve, the water level display unit, the salt content display unit, the first valve position display unit, and the second valve position display unit are all connected to the control unit.

[0019] Therefore, the ship evaporator blowdown water control system provided by the application can remove salt from the boiler water, maintain the water level of the blowdown evaporator in a specified range, and meet the process requirements of the blowdown control system. The water level signal of the blowdown evaporator and the water quality salt content signal of the steam generator are introduced as double impulses of the control system, and the output results are applied to the water level regulating valve and the steam regulating valve through adaptive control mode, logical correction, and comprehensive superposition calculation, so that the blowdown water system is effectively controlled.

[0020] The application adds a steam regulating valve and a water quality sensor to realize linkage cascade control of controlling the blowdown evaporator water level and the salt content of the blowdown water, solve the problem of disconnection of the associated parameters of the ship blowdown water control system and imperfect control performance. Meanwhile, the adaptive control mode is adopted to optimize the control algorithm to avoid control system shock, control lag, increase the processing of fault adaptive recovery ability of the sensor and the regulating valve, and the trend suppression within the controlled impulse specified range; the automatic adaptive function is provided when the blowdown amount of the blowdown system and the heating steam amount change greatly due to the load change of the previous process system during operation, the stability of the system is improved, and the overall automatic control level of the blowdown system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0022] Figure 1 A structural schematic diagram of a ship evaporator blowdown water control system provided by the embodiment of the present application is provided. Figure 2 A specific structural schematic diagram of a ship evaporator blowdown water control system provided by the embodiment of the present application is provided. Figure 3 A flowchart of a ship evaporator blowdown water control method provided by the embodiment of the present application is provided.

[0023] Reference signs: 1, steam generator; 2, blowdown evaporator; 3, selection control operation unit; 4, control unit; 5, water level regulating valve; 6, steam regulating valve; 7, first electric actuator; 8, second electric actuator; 11, water level sensor; 12, water level display unit; 21, water quality sensor; 22, salt content display unit; 31, selection operator; 32, first operator; 33, second operator; 41, acquisition unit; 42, fault judgment unit; 43, control mode operation unit; 44, control output unit; 45, control display unit; 46, adaptive operation database unit; 51, first valve position feedback unit; 52, first remote control unit; 53, first switch control unit; 54, first valve position display unit; 61, second valve position feedback unit; 62, second remote control unit; 63, second switch control unit; 64, second valve position display unit. DETAILED DESCRIPTION

[0024] To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of the present application.

[0025] The embodiments of the present application provide a ship evaporator blowdown water control system and a control method thereof, which can solve the problem that the current control system does not introduce a boiler water salt content signal, and when the boiler water salt content of the evaporating device continuously exceeds the standard, only the heating steam stop valve of the evaporator can be locally operated or the emergency blowdown is started, thereby affecting the efficiency and control effect of the blowdown system.

[0026] Referring to FIGS. 1 and 2, Figure 1 and Figure 2 The first aspect of the embodiments of the present application provides a ship evaporator blowdown water control system, comprising: An evaporating blowdown device, which comprises a steam generator 1, a water level regulating valve 5 is installed on a blowdown water pipeline of the steam generator 1, and the water level regulating valve 5 is used to discharge the boiler water in the steam generator 1 to a blowdown evaporator 2 after the blowdown water pipeline, so as to replace the boiler water in the steam generator 1 and reduce the salt content of the boiler water in the steam generator 1.

[0027] An outlet of the blowdown water pipeline is connected with the blowdown evaporator 2, the boiler water discharged from the steam generator 1 enters the blowdown evaporator 2, the blowdown evaporator 2 is connected with a steam regulating valve 6, and the steam regulating valve 6 evaporates the boiler water in the blowdown evaporator 2 by introducing steam into the blowdown evaporator 2, so as to reduce the water level height of the blowdown evaporator 2.

[0028] A water quality sensor 21 for detecting the salt content of water is arranged in the steam generator 1, and a water level sensor 11 for detecting the liquid level height is arranged in the blowdown evaporator 2. When the water quality sensor 21 detects that the salt content of water in the steam generator 1 is higher than a set threshold value, the water level regulating valve 5 discharges the boiler water in the steam generator 1 to the blowdown evaporator 2. When the water level sensor 11 detects that the water level height in the blowdown evaporator 2 is higher than a set threshold value, the steam regulating valve 6 increases the valve opening to introduce heating steam into the blowdown evaporator 2, so as to rapidly evaporate the boiler water in the blowdown evaporator 2 and reduce the water level height.

[0029] The blowdown control device comprises a control unit 4, a water level display unit 12 connected with the water level sensor 11, a salt content display unit 22 connected with the water quality sensor 21, a first valve position display unit 54 connected with the water level regulating valve 5, and a second valve position display unit 64 connected with the steam regulating valve 6. The water level regulating valve 5, the steam regulating valve 6, the water level display unit 12, the salt content display unit 22, the first valve position display unit 54, and the second valve position display unit 64 are all connected with the control unit 4.

[0030] The water level display unit 12 is used to receive the water level signal of the water level sensor 11 and send the water level signal to the control unit 4, and the salt content display unit 22 is used to receive the salt content signal of the water quality sensor 21 and send the salt content signal to the control unit 4. The first valve position display unit 54 is used to receive the valve opening signal of the water level regulating valve 5 and send the valve opening signal to the control unit 4, and the second valve position display unit 64 receives the valve opening signal of the steam regulating valve 6 and sends the valve opening signal to the control unit 4.

[0031] The control unit 4 is used to collect the water level signal, the salt content signal, the valve opening feedback signal of the water level regulating valve 5 and the steam regulating valve 6, and to perform adaptive linkage control of the water level regulating valve 5 and the steam regulating valve 6 according to the collected signals.

[0032] The water level regulating valve 5 for discharging the boiler water in the steam generator 1 is installed on the blowdown water pipeline of the steam generator 1, and the boiler water in the steam generator 1 enters the blowdown evaporator 2 through the water level regulating valve 5. Meanwhile, the steam regulating valve 6 is arranged at the inlet of the blowdown evaporator 2, and is used to introduce heating steam into the blowdown evaporator 2 to evaporate the boiler water in the blowdown evaporator 2, thereby adjusting the water level height in the blowdown evaporator 2.

[0033] The water quality sensor 21 for detecting the salt content of the water is arranged in the steam generator 1, and the water level sensor 11 for detecting the liquid level height is arranged in the blowdown evaporator 2. The salt content of the boiler water in the steam generator 1 is divided into different levels in different regions, and different valve opening degrees of the steam regulating valve 6 are set corresponding to different levels exceeding the different specified values. When the opening degree of the steam regulating valve 6 is increased, the water level of the blowdown evaporator 2 is lowered, and at this time, the control system controls the opening degree of the water level regulating valve 5 to follow the increase, so as to increase the blowdown water amount, and control the water level of the blowdown evaporator 2 in the specified range, thereby realizing the cascade linkage control of the blowdown water control system.

[0034] When the salt content of the boiler water in the steam generator 1 is lower than the specified value, the steam regulating valve 6 is set at a certain opening degree according to the experience feedback output, and the control system only controls the water level regulating valve 5 through the water level height, so as to maintain the water level of the blowdown evaporator 2 in the specified range.

[0035] The ship evaporator blowdown water control system of the embodiment of the application is used to realize the removal of salts in the boiler water, maintain the water level of the blowdown evaporator 2 within a specified range, and realize the process requirements of the blowdown control system. The water level signal of the blowdown evaporator 2 and the water quality salt content signal of the steam generator 1 are introduced as the double impulses of the control system. Through self-adaptive control mode, logical correction, and comprehensive superposition calculation, the output results are applied to the water level regulating valve 5 and the steam regulating valve 6 to realize effective control of the blowdown water system.

[0036] The steam regulating valve 6 and the water quality sensor 21 are added to realize the linkage cascade control of the blowdown evaporator 2 water level and the blowdown water salt content, solve the problem of disconnection of related parameters and imperfect control performance of the ship blowdown water control system. At the same time, the self-adaptive control mode is adopted to optimize the control algorithm to avoid control system oscillation and control lag, increase the processing of fault self-adaptive recovery capability of the sensor and the regulating valve, and suppress the trend within the specified range of the controlled impulse. The automatic adaptive function is realized when the blowdown amount of the blowdown system and the heating steam amount change greatly due to the load change of the previous process system, the stability of the system is improved, and the overall automatic control level of the blowdown system is improved.

[0037] In some optional embodiments, as shown in Figure 1 and Figure 2 The ship evaporator blowdown water control system of the embodiment of the application further comprises a selection and control operation unit 3 connected with the control unit 4, and the selection and control operation unit 3 is used to send a remote control operation signal to the control unit 4 and the water level regulating valve 5 and the steam regulating valve 6. The selection and control operation unit 3 comprises a selection and control device 31 and an operator, and the selection and control device 31 is used to control the water level regulating valve 5 and the steam regulating valve 6 to be in a remote control mode or an automatic mode.

[0038] The selection and control device 31 is used for the selection of the operation mode of the water level regulating valve 5 and the steam regulating valve 6, and the operation mode of the water level regulating valve 5 and the steam regulating valve 6 comprises remote control and automatic. The operator comprises a first operator 32 and a second operator 33, and the first operator 32 and the second operator 33 are respectively connected with the water level regulating valve 5 and the steam regulating valve 6 to control the remote control of the water level regulating valve 5 and the steam regulating valve 6.

[0039] The first operator 32 is connected with a first electric actuating unit 7, and the second operator 33 is connected with a second electric actuating unit 8. The selection and control device 31 is used to send a remote control signal when remote control is performed. The selection and control device 31 is also connected with the control unit 4 and is used to send a remote control / automatic control mode signal of the water level regulating valve 5 and the steam regulating valve 6 to the control unit 4. The automatic operation mode is used to control the water level regulating valve 5 and the steam regulating valve 6 to act according to the operation condition.

[0040] The control unit 4 selects different control modes according to the selector 31. When automatic mode is selected, it sends the calculated control command to the water level regulating valve 5 and the judged control command to the steam regulating valve 6. When remote control mode is selected, the control unit 3 sends switch signals to the water level regulating valve 5 and the steam regulating valve 6 through the first operator 32 and the second operator 33.

[0041] In some alternative embodiments: see Figure 1 and Figure 2 As shown in the figure, this application embodiment provides a ship evaporator wastewater discharge control system. The control unit 4 of the ship evaporator wastewater discharge control system includes a control display unit 45, a data acquisition unit 41, a fault judgment unit 42, a control mode calculation unit 43, an adaptive calculation database unit 46, and a control output unit 44. The data acquisition unit 41 is used to acquire selective control operation signals, water level signals, salinity signals, and valve position feedback signals, and transmit the acquired signals to the control display unit 45 and the fault judgment unit 42.

[0042] The fault judgment unit 42 judges the fault mode and sends it to the adaptive calculation database unit 46. The adaptive calculation database unit 46 combines and extracts the fault modes and adaptively selects the control mode according to the fault mode. The control mode calculation unit 43 performs data calculation according to the corresponding control mode and transmits the calculated valve opening control result to the control output unit 44. The control output unit 44 is connected to the water level regulating valve 5 to complete the control of the water level regulating valve 5. The fault modes include water level sensor failure, water level regulating valve failure, and malfunction signals caused by interference signals.

[0043] The control unit 4 judges the salinity signal value and outputs the corresponding opening degree to the steam regulating valve 6 according to different salinity thresholds. Within the normal range, it provides an empirical opening degree. The control mode calculation unit 43 performs data calculation according to the corresponding control mode of water level control and transmits the calculated valve opening control result of the water level regulating valve 5 and the valve opening assignment result of the steam regulating valve 6 to the control output unit 44. The control output unit 44 is connected to the water level regulating valve 5 and the steam regulating valve 6 to complete the control of the water level regulating valve 5 and the steam regulating valve 6.

[0044] The control mode calculation unit 43 determines whether the salinity of the boiler water in the steam generator 1 is lower than the second threshold or higher than the threshold of each level based on the parameters collected by the acquisition unit 41, and locks the corresponding output values ​​accordingly. In case of a fault, the fault judgment unit 42 and the adaptive calculation database unit 46 extract the combination of fault modes, and the control mode calculation unit 43 selects the corresponding fault mode for data calculation and locks the output value of the corresponding valve position. The locked valve position opening control result is transmitted to the control output unit 44, which is connected to the steam regulating valve 6 to complete the control of the steam regulating valve 6.

[0045] The water level regulating valve 5 is closed when the water level exceeds the upper limit value and is opened when the water level is below the lower limit value. The opening of the steam regulating valve 6 is increased, the water level has a downward trend, and the opening of the water level regulating valve 5 is increased, so the blowdown is increased; on the contrary, the opening of the steam regulating valve 6 is decreased, the water level has an upward trend, and the opening of the water level regulating valve 5 is decreased, so the blowdown is decreased. Through the above-mentioned control unit 4, the self-adaptive linkage control of the water level regulating valve 5 and the steam regulating valve 6 is realized under fault conditions.

[0046] The acquisition unit 41 is connected to all components connected to the control unit 4, and acquires the water level, the salt content, the valve position feedback, and the signal of the selection and control operation unit, transmits the above-mentioned signals to the control display unit 45 for display, and transmits the signals to the fault judgment unit 42, which, in combination with the self-adaptive operation database unit 46, analyzes the received signals and transmits them to the control mode operation unit 43. The control mode operation unit 43 selects the corresponding control mode according to the received signals, performs data calculation or threshold value judgment, and transmits the calculated valve opening or the locked valve opening control quantity result to the control output unit 44. The control output unit 44 is connected to the water level regulating valve 5 and the steam regulating valve 6, and converts the result into a 4mA-20mA current driving signal, which is sent to the corresponding water level regulating valve 5 and steam regulating valve 6.

[0047] The control mode operation of the control unit 4 adopts a self-adaptive logic control algorithm and a human-like intelligent control. When the water level exceeds the specified range, the logic control algorithm judges the inertia change direction and trend of the controlled quantity according to the deviation, the first-order derivative and the second-order derivative of the controlled quantity, in combination with the correction and fault extraction of the self-adaptive operation database, to give the action value of the corresponding water level regulating valve or steam regulating valve. When the water level exceeds the upper limit and the lower limit, the valve action directions are opposite, and the self-adaptive mode operation is performed through the correction coefficient of the identifier.

[0048] When the deviation of the controlled quantity continuously increases, the control output unit 44 outputs a signal to make the corresponding actuator of the water level regulating valve 5 act, so as to control the water level and stop the increase of the deviation; when the deviation of the controlled quantity no longer increases, the corresponding actuator is appropriately controlled to act according to the size of the deviation after a certain time delay. When the water level deviation falls within the normal range, the human-like intelligent control simulates the behavior function of a human being, maximally identifies the process characteristic information, performs heuristic and self-conscious reasoning, simulates the operation of an operator, and controls the deviation of the controlled object within a stable range.

[0049] In the embodiment, the salt content control mode of the boiler water in the steam generator 1 is implemented by indirectly controlling the water level regulating valve 5 through directly controlling the steam regulating valve 6. The logic operation of the steam regulating valve 6 control is to judge according to the salt content level threshold value of the boiler water in the steam generator 1, lock the output, and combine the correction and fault extraction operation of the self-adaptive operation database unit 46 to give the action value of the steam regulating valve 6.

[0050] When the salinity is higher than the first threshold, two levels of valve opening are set. The valve opening corresponding to the second threshold is less than the valve opening corresponding to the third threshold. When the salinity is lower than the second threshold, the valve opening is less than the valve opening corresponding to the second threshold. Under the premise that the salinity of the boiler water meets the second threshold requirement, the steam regulating valve 6 is not activated, and the control system only controls the water level of the evaporator 2 to be within the specified range.

[0051] In some alternative embodiments: see Figure 1 and Figure 2 As shown in the figure, this application embodiment provides a ship evaporator wastewater discharge control system. The water level regulating valve 5 of this system is connected to a first electric actuator 7, which is connected to a first valve position display unit 54 and the water level regulating valve 5. Furthermore, the first electric actuator 7 is connected to a control unit 4 and a selective control operation unit 3, and is used to receive current drive signals sent by the control unit 4 and switching quantity drive signals sent by the selective control operation unit 3.

[0052] The first electric actuator 7 includes a first remote control unit 52, a first switch control unit 53, and a first valve position feedback unit 51. The first remote control unit 52 receives analog control signals from the control unit 4 and drives the water level regulating valve 5 to operate. The first switch control unit 53 receives switch signals from the selective control operation unit 3 and operates the water level regulating valve 5. The first valve position feedback unit 51 is connected to the control unit 4 through the first valve position display unit 54 and sends the position signal of the water level regulating valve 5 to the control unit 4.

[0053] In this embodiment, the water level regulating valve 5 is connected to a first electric actuator 7, which includes a first valve position feedback unit 51, a first remote control unit 52, and a first switch control unit 53. The first switch control unit 53 is connected to a first operator 32 and receives remote control signals sent by the selector 31. The first remote control unit 52 is connected to a control output unit 44 and receives current analog control signals. The first valve position feedback unit 51 is connected to a first valve position display unit 54 and sends current analog signals.

[0054] In some alternative embodiments: see Figure 1 and Figure 2 As shown, this application embodiment provides a ship evaporator wastewater discharge control system. The steam regulating valve 6 of the ship evaporator wastewater discharge control system is connected to a second electric actuator 8. The second electric actuator 8 is connected to a second valve position display unit 64 and the steam regulating valve 6. The second electric actuator 8 is also connected to a control unit 4 and a selective control operation unit 3, and is used to receive current drive signals sent by the control unit 4 and switching quantity drive signals sent by the selective control operation unit 3.

[0055] The second electric actuating unit 8 comprises a second remote control unit 62, a second switch control unit 63 and a second valve position feedback unit 61. The second remote control unit 62 is configured to receive the analog control signal of the control unit 4 and drive the steam regulating valve 6 to operate. The second switch control unit 63 is configured to receive the switch signal of the selection and control operation unit 3 and operate the steam regulating valve 6 to act. The second valve position feedback unit 61 is connected to the control unit 4 through the second valve position display unit 64 and configured to send the position signal of the steam regulating valve 6 to the control unit.

[0056] The second electric actuating unit 8 connected with the steam regulating valve 6 in the embodiment comprises a second valve position feedback unit 61, a second remote control unit 62 and a second switch control unit 63. The second switch control unit 63 is connected to the second operator 33 and receives the remote control signal. The remote control unit 63 is connected to the control output unit 44 and receives the current analog control signal sent by the selection and control operation unit 31. The second valve position feedback unit 61 is connected to the second valve position display unit 64 and sends the current analog signal.

[0057] The second aspect of the embodiment provides a ship evaporator blowdown water control method, characterized in that the method uses the ship evaporator blowdown water control system in any of the above embodiments, and the method comprises the following steps: S101: power on the system and initialize, perform parameter initialization operation, and make the control unit 4, the water level sensor 11, the water quality sensor 21, the water level display unit 12, the salt content display unit 22, the first valve position display unit 54 and the second valve position display unit 64 in the system work.

[0058] S102: signal acquisition, the control unit 4 acquires the selection and control operation signal, the water level signal, the salt content signal and the valve position feedback signal, and transmits the acquired signals to the control display unit 41 and the fault judgment unit 42.

[0059] S103: judge the control mode of the system, if the selection and control operation unit 31 is placed in the remote control mode, the operator controls the opening degree of the water level regulating valve 5 and the steam regulating valve 6 in the remote control operation mode according to the water level display unit 11, the salt content display unit 21, the first valve position display unit 54 and the second valve position display unit 64.

[0060] S104: if the selection and control operation unit 31 is placed in the automatic mode, the water level regulating valve 5 and the steam regulating valve 6 are put into automatic control, and the control unit 4 selects the water level signal as the main controlled variable and the salt content signal as the secondary controlled variable.

[0061] S105: adopt the salt content grading value judgment, the valve position set the first valve position if the salt content is higher than the first threshold value, the second valve position if higher than the second threshold value, and the third valve position if higher than the third threshold value. Different value ranges give corresponding opening degrees of the steam regulating valve 6. The valve position opening degree corresponding to the third threshold value is relatively larger than other set valve position opening degrees. When the salt content is below the first threshold value, a certain fixed steam regulating valve opening degree is output according to experience, which is smaller than the valve position opening degree corresponding to the first threshold value.

[0062] S106: judge whether the water quality sensor 21 is malfunctioning. If yes, select the corresponding fault mode and correction coefficient to lock the operation result and output to the steam regulating valve 6.

[0063] S107: judge whether the water level sensor 11 is malfunctioning. If yes, select the corresponding fault mode and correction coefficient to perform control operation, lock the operation result and output to the water level regulating valve 5. If no, go to S108.

[0064] S108: judge whether the water level of the bleeder evaporator 2 is higher than the specified value. If yes, go directly to S109; if no, go to S110.

[0065] S109: the water level is higher than the specified upper limit value. Select the corresponding control mode and combine self-adaptation to perform logical operation, and output a signal to make the water level regulating valve 5 smaller.

[0066] S110: judge whether the water level is lower than the specified value. If yes, go directly to step 111; if no, go to S112.

[0067] S111: judge whether the water level is lower than the specified value. If yes, select the corresponding control mode and combine self-adaptation to perform logical operation, and output a signal to make the water level regulating valve 5 larger.

[0068] S112: when the water level is in the normal range, select the corresponding control mode, and output a fine-tuning signal according to the deviation to make the water level regulating valve 5 output the water level regulating valve opening degree signal to make the water level fall back to the specified value position in advance when approaching the limit value.

[0069] S113: judge whether the valve position feedback input of the water level regulating valve 5 and the steam regulating valve 6 is abnormal. If yes, lock the current valve position output signal.

[0070] S114: output the operation result to the water level regulating valve 5 and the steam regulating valve 6, and return.

[0071] The acquisition unit 41 in the control unit 4 of the embodiment of the application receives water level sensor data, water quality sensor data, valve position feedback data and selection control data, and then performs fault mode analysis through the fault judgment unit 42 to determine whether the system is in a normal state or a fault state. The fault state mainly includes water level sensor fault, water quality sensor fault, water level regulating valve and steam regulating valve fault. The adaptive operation database unit 46 combines the fault modes and adaptively selects the control mode according to the fault mode.

[0072] The mode for water level control mainly includes a first-order integral characteristic transfer function mode, which includes enabling the water level regulating valve 5 to run in the opening direction and the closing direction, a variable weight prediction control mode under the steady-state water level condition, and a water level control output locking control mode. After the adaptive control mode selection is completed, the result is sent to the control mode operation unit 43, the control mode operation unit 43 performs a water level control output self-correction mode, and finally the water level valve position control signal is output through the control output unit 44.

[0073] The mode for salt content control mainly compares the salt content signal value with the first threshold value and the second threshold value. After the adaptive operation of the control mode operation unit 43 in combination with the corresponding fault mode, the corresponding different set opening degree control signal of the steam regulating valve 6 is output through the control output unit 44, so as to realize the linkage control of the blowdown water system.

[0074] In the embodiment of the application, the specific implementation method of the ship evaporator blowdown water control method is as shown in Figure 3 The main logic control steps include: P1. System power-on and initialization: Perform parameter initialization operation to make the control unit 4, water level sensor 11, water quality sensor 21, water level display unit 12, salt content display unit 22, first valve position display unit 54, second valve position display unit 64, water level regulating valve 5 and steam regulating valve 6 in the system in a working state.

[0075] P2. The acquisition unit 41 acquires the water level signal, the boiler water salt content signal, the valve position feedback signal and the selection control operator signal.

[0076] P3. Determine whether the current working condition is that the water level regulating valve 5 is automatically put into operation. If not, go to P22; if yes, the water level regulating valve 5 and the steam regulating valve 6 are both automatically put into operation to go to P4.

[0077] P4. Water level regulating valve 5 and steam regulating valve 6 automatic working state, go to P5.

[0078] P5. Determine whether the salt content is higher than the first threshold value. If yes, go to P6; if no, go to P7.

[0079] P6. The different ranges of values corresponding to the first threshold value and the second threshold value are given respectively to the corresponding opening of the steam regulating valve 6, and step P8 is entered. P7. The salt content is below the first threshold value, and a certain fixed opening of the steam regulating valve is output according to experience, and step P8 is entered.

[0080] P8. It is judged whether the water quality sensor 21 is faulty, if yes, step P9 is entered; if no, step P11 is entered.

[0081] P9. The corresponding correction coefficient is selected and the prompt is identified, and step P10 is entered. P10. The corresponding fault mode and correction coefficient are selected, and the operation result is locked and output to the steam regulating valve 6, and step P11 is entered. P11. It is judged whether the water level sensor 11 is faulty, if yes, step P12 is entered; if no, step P14 is entered.

[0082] P12: The corresponding correction coefficient is selected and the prompt is identified, and step P13 is entered.

[0083] P13: The corresponding fault mode and correction coefficient are selected, and the mode operation result is output to the water level regulating valve 5, and step P21 is entered.

[0084] P14: It is judged whether the water level of the bleeder evaporator 2 is higher than the specified value, if yes, step P15 is entered; if no, step P16 is entered.

[0085] P15: The corresponding control mode is selected and logical operation is performed in combination with the adaptive mode, and an output is made to make the water level regulating valve 5 smaller, and step P19 is entered.

[0086] P16: It is judged whether the water level is lower than the specified value, if yes, step P17 is entered directly; if no, step P18 is entered.

[0087] P17: The corresponding control mode is selected and logical operation is performed in combination with the adaptive mode, and an output is made to make the water level regulating valve 5 larger, and step P19 is entered.

[0088] P18: A fine tuning signal is output according to the deviation, so that the water level regulating valve 5 can output the water level regulating valve opening to make the water level fall back to the specified position in advance when approaching the limit value, and step P19 is entered.

[0089] P19: It is judged whether the valve position feedback input of the water level regulating valve 5 and the steam regulating valve 6 is abnormal, if yes, step P20 is entered directly; if no, step P21 is entered. P20: The input of the water level regulating valve 5 and the steam regulating valve 6 is abnormal, and the current valve position output signal is locked, and step P21 is entered.

[0090] P21: The operation result is output to the water level regulating valve 5 and the steam regulating valve 6, and the water level regulating valve 5 and the steam regulating valve 6 return after being operated according to the operation result.

[0091] P22: Remote control mode, the operator performs remote control operation according to the control display unit 45, and outputs the on-off quantity to the water level regulating valve 5 and the steam regulating valve 6.

[0092] The ship steam generator blowdown water control system of the embodiment of the application is operated first to perform parameter initialization operation, and after the parameter initialization, the acquisition unit 41 collects the water level, the salt content, the regulating valve feedback signal and the selected control operator signal.

[0093] If the selected control operator 31 is placed in remote control, the operator controls and adjusts the valve opening degree of the water level regulating valve 5 and the steam regulating valve 6 in the remote control operation mode according to the first valve position display unit 54, the first valve position display unit 64, the water level display unit 12 and the salt content indication unit 22.

[0094] If the selected control operator 31 is placed in automatic, the water level regulating valve 5 and the steam regulating valve 6 are in automatic state, the control system selects the water level of the blowdown evaporator 2 as the main controlled variable, and adopts the logic control algorithm and the human-like intelligent control to judge the inertia change direction and trend of the controlled variable according to the deviation, the first order derivative and the second order derivative of the controlled variable, calculate the control law and give the control instruction corresponding to the regulating valve.

[0095] The salt content of the boiler water in the steam generator 1 is selected as the secondary controlled variable, the corresponding regulating valve opening degree instruction is given according to the different threshold value judgment setting of the specified value, at this time, the blowdown water control system works normally, and the water level and the salt content of the control system are in the specified range.

[0096] If no fault occurs in the blowdown water control system, when the salt content is lower than the first threshold value, the control unit 4 outputs a certain opening degree of the steam regulating valve 6 according to experience, at this time, the blowdown water control system only controls the water level of the blowdown evaporator 2 to be in the specified range.

[0097] When the salt content is higher than the first threshold value, the opening degree of the steam regulating valve 6 is increased to the first valve position corresponding to the first threshold value, when it is higher than the second threshold value, the opening degree of the steam regulating valve 6 is further increased to the second valve position corresponding to the second threshold value, and when it is higher than the third threshold value, the opening degree of the steam regulating valve 6 is further increased to the third valve position corresponding to the third threshold value.

[0098] When the steam regulating valve 6 is opened, the interlocking reaction of the control system must make the water level of the blowdown evaporator 2 decrease, when the water level exceeds the lower limit value, at this time, the control unit 4 judges the change of the controlled variable, selects the corresponding control mode and performs logic operation in combination with the adaptive mode, so that the opening degree of the water level regulating valve 5 is increased, the blowdown water quantity is increased, and thus the water level of the blowdown evaporator 2 is maintained in the specified range.

[0099] When the water level drop is not beyond the range, the control unit 4 judges the change of the controlled quantity, and gives the control instruction of the human-like point according to the control law after the weight coefficient is corrected, so as to make fine adjustment intervention to suppress the trend, thereby making the blowdown water control system adaptive.

[0100] When the fault judging unit 42 in the control unit 4 detects the failure of the water level sensor 11, the control mode operation unit 43 selects the output lock control mode of the water level control valve 5 in combination with the type of the adaptive operation database unit 46, so as to adapt to the failure mode.

[0101] When the fault judging unit 42 in the control unit 4 detects the failure of the water quality sensor 21, the control mode operation unit 43 selects the output lock control mode of the steam regulating valve 6 in combination with the type of the adaptive operation database unit 46, so as to adapt to the failure mode.

[0102] When the fault judging unit 42 in the control unit 4 detects the input abnormality of the water level regulating valve 5 or the steam regulating valve 6, the control mode operation unit 43 selects the output lock control mode of the water level regulating valve 5 or the steam regulating valve 6 in combination with the type of the adaptive operation database unit 46, so as to adapt to the failure mode.

[0103] Therefore, the blowdown water control system of the application has good adaptive ability to the over-standard salt content of the boiler water in the steam generator 1, the water level change of the blowdown evaporator 2, the failure of the water level sensor 11 and the water quality sensor 21, and the failure of the water level regulating valve 5, so as to maximize the normal operation of the ship blowdown water control system.

[0104] In the description of the application, it should be noted that the positions or position relationships indicated by the terms "upper", "lower" and the like are based on the positions or position relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as a limitation on the application. Unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or internal connection of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0105] It should be noted that, in the present application, the relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0106] The foregoing is merely illustrative of the principles of the application and various modifications can be made by those skilled in the art without departing from the spirit and scope of the application. The above embodiments are illustrative, and not restrictive, of the scope of the application.

Claims

1. A ship evaporator wastewater discharge control system, characterized in that, include: An evaporation and sewage discharge device includes a steam generator (1), a water level regulating valve (5) installed on the sewage discharge pipeline of the steam generator (1), a discharge evaporator (2) connected to the outlet of the sewage discharge pipeline, a steam regulating valve (6) connected to the discharge evaporator (2), a water quality sensor (21) for detecting water salinity is provided in the steam generator (1), and a water level sensor (11) for detecting liquid level height is provided in the discharge evaporator (2). The sewage control device includes a control unit (4), a water level display unit (12) connected to the water level sensor (11), a salinity display unit (22) connected to the water quality sensor (21), a first valve position display unit (54) connected to the water level regulating valve (5), and a second valve position display unit (64) connected to the steam regulating valve (6). The water level regulating valve (5), the steam regulating valve (6), the water level display unit (12), the salinity display unit (22), the first valve position display unit (54), and the second valve position display unit (64) are all connected to the control unit (4).

2. The ship evaporator wastewater discharge control system as described in claim 1, characterized in that: The sewage control device also includes a selective control operation unit (3) connected to the control unit (4). The selective control operation unit (3) includes a selector (31) and an operator. The selector (31) is used to control the water level regulating valve (5) and the steam regulating valve (6) to be in remote control mode or automatic mode. The operator includes a first operator (32) and a second operator (33), which are respectively connected to the water level regulating valve (5) and the steam regulating valve (6) to control the remote control of the water level regulating valve (5) and the steam regulating valve (6).

3. The ship evaporator wastewater discharge control system as described in claim 2, characterized in that: The control unit (4) includes a control display unit (45), a data acquisition unit (41), a fault judgment unit (42), a control mode calculation unit (43), an adaptive calculation database unit (46), and a control output unit (44). The data acquisition unit (41) is used to acquire the selective control operation signal, water level signal, salinity signal, and valve position feedback signal, and transmit the acquired signals to the control display unit (45) and the fault judgment unit (42). The control unit (4) judges the salt content signal value and outputs the corresponding opening degree of the steam regulating valve (6) according to different salt content thresholds. The control mode calculation unit (43) performs data calculation according to the corresponding control mode of water level control and transmits the calculated valve opening control result of the water level regulating valve (5) and the valve opening assignment result of the steam regulating valve (6) to the control output unit (44). The control output unit (44) is connected to the water level regulating valve (5) and the steam regulating valve (6) to complete the control of the water level regulating valve (5) and the steam regulating valve (6). The fault judgment unit (42) judges the fault mode and sends it to the adaptive calculation database unit (46). The adaptive calculation database unit (46) extracts the fault modes and adaptively selects the control mode according to the fault mode. The fault modes include water quality sensor (21) fault, water level sensor (11) fault, water level regulating valve (5) and steam regulating valve (6) fault.

4. A ship evaporator wastewater discharge control system as described in claim 3, characterized in that: The control mode calculation of the control unit (4) adopts an adaptive logic control algorithm and humanoid intelligent control; When the water level exceeds the specified range, the logic control algorithm determines the direction and trend of the inertial change of the controlled variable based on the deviation of the controlled variable, the first derivative and the second derivative of the deviation, and gives the action value of the corresponding water level regulating valve (5) or steam regulating valve (6). The valve action direction is opposite when the water level exceeds the upper and lower limits. The adaptive mode calculation is performed by the marked correction coefficient. The humanoid intelligent control system identifies process change trends to the maximum extent within the specified water level range, performs autonomous reasoning, simulates the operation of the operator, and controls the deviation of the controlled object within a stable range.

5. A ship evaporator wastewater discharge control system as described in claim 3, characterized in that: The water level regulating valve (5) is connected to a first electric actuator (7). The first electric actuator (7) is connected to the first valve position display unit (54) and the water level regulating valve (5). The first electric actuator (7) is also connected to the control unit (4) and the selective control operation unit (3) to receive the current drive signal sent by the control unit (4) and the switch quantity drive signal sent by the selective control operation unit (3).

6. A ship evaporator wastewater discharge control system as described in claim 5, characterized in that: The first electric actuator (7) includes a first remote control unit (52), a first switch control unit (53) and a first valve position feedback unit (51). The first remote control unit (52) is used to receive the analog control signal from the control unit (4) and drive the water level regulating valve (5) to operate. The first switch control unit (53) is used to receive the switch signal from the select control operation unit (3) and operate the water level regulating valve (5). The first valve position feedback unit (51) is connected to the control unit (4) through the first valve position display unit (54) and is used to send the position signal of the water level regulating valve (5) to the control unit (4).

7. A ship evaporator wastewater discharge control system as described in claim 6, characterized in that: The steam regulating valve (6) is connected to a second electric actuator (8), which is connected to the second valve position display unit (64) and the steam regulating valve (6). The second electric actuator (8) is also connected to the control unit (4) and the selective control operation unit (3) to receive the current drive signal sent by the control unit (4) and the switch quantity drive signal sent by the selective control operation unit (3).

8. A ship evaporator wastewater discharge control system as described in claim 7, characterized in that: The second electric actuator (8) includes a second remote control unit (62), a second switch control unit (63), and a second valve position feedback unit (61). The second remote control unit (62) is used to receive the analog control signal from the control unit (4) and drive the steam regulating valve (6) to operate. The second switch control unit (63) is used to receive the switch signal from the select control operation unit (3) and operate the steam regulating valve (6). The second valve position feedback unit (61) is connected to the control unit (4) through the second valve position display unit (64) and is used to send the position signal of the steam regulating valve (6) to the control unit (4).

9. A ship evaporator wastewater discharge control system as described in claim 8, characterized in that: The first switch control unit (53) is connected to the first operator (32), and the second switch control unit (63) is connected to the second operator (33).

10. A method for controlling wastewater discharge from a ship's evaporator, characterized in that, The method uses the ship evaporator wastewater control system according to any one of claims 1 to 9, the method comprising: S101: Power on the system and initialize it: Perform parameter initialization operation to make the control unit (4), water level sensor (11), water quality sensor (21), water level display unit (12), salinity display unit (22), first valve position display unit (54), and second valve position display unit (64) in the system in working state; S102: Signal acquisition: The control unit (4) acquires the selective control operation signal, water level signal, salinity signal and valve position feedback signal, and transmits the acquired signals to the control display unit (45) and the fault judgment unit (42). S103: Determine the control mode of the system. If the selector (31) is set to remote control mode, the operator controls the opening of the water level regulating valve (5) and the steam regulating valve (6) by using the remote control operation mode according to the water level display unit (12), the salinity display unit (22), the first valve position display unit (54), and the second valve position display unit (64). S104: If the selector (31) is set to automatic mode, the water level regulating valve (5) and the steam regulating valve (6) are put into automatic control, and the control unit (4) selects the water level and salinity as the controlled variables. S105: The opening degree of the steam regulating valve (6) is given according to the salt content classification and value determination, corresponding to three different value ranges: less than the second threshold, greater than the second threshold, and greater than the third threshold. S106: Determine whether the water quality sensor (21) has malfunctioned. If so, select the corresponding fault mode and correction coefficient to lock the calculation result and output it to the steam regulating valve (6). S107: Determine whether the water level sensor (11) has malfunctioned. If yes, select the corresponding fault mode and correction coefficient for control calculation and lock the calculation result output to the water level regulating valve (5). If no, proceed to S108. S108: Determine whether the water level of the evaporator (2) is higher than the specified value. If yes, proceed directly to S109; otherwise, proceed to S110. S109: Select the corresponding control mode and perform logical operations in combination with adaptive control to output a signal that makes the water level regulating valve (5) close. S110: When determining whether the water level is lower than the specified value, if yes, proceed directly to step 111; otherwise, proceed to S112. S111: Select the corresponding control mode and perform logical operations in combination with adaptive control to output a signal that makes the water level regulating valve (5) open wider; S112: Select the corresponding control mode, and output the fine-tuning signal according to the deviation, so that the water level regulating valve (5) can output the water level regulating valve opening signal in advance when it is close to the limit, so that the water level drops back to the specified value position. S113: Determine whether the valve position feedback input of the water level regulating valve (5) and the steam regulating valve (6) is abnormal. If so, lock the current valve position output signal. S114: The calculation result is output to the water level regulating valve (5) and the steam regulating valve (6) and then returned.

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