CN115749992B - Pump flow/self-flow switching control and false alarm suppression method for ship cooling system - Google Patents
Pump flow/self-flow switching control and false alarm suppression method for ship cooling system Download PDFInfo
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Abstract
The invention provides a pump flow/self-flow switching control and false alarm suppression method for a ship cooling system by adopting self-flow circulation, belonging to the technical field of ship power system control; in the prior art, the problems of frequent pump flow/self flow switching and false condenser pressure alarm caused by the dynamic variable working condition of ship navigation are difficult to solve; the invention provides a ship self-flow cooling system, which comprises: the device comprises an inlet connecting pipe, an inlet guide sleeve, a circulating water pump, a condenser, an outlet connecting pipe, an outlet guide sleeve and an air extractor, wherein the control purpose is clear, the self-flow cooling margin is large, the self-flow cooling capacity is fully exerted, and the problem of frequent pump flow/self-flow switching caused by the dynamic variable working condition of ship navigation is solved.
Description
Technical Field
The scheme belongs to the technical field of ship power system control, and particularly relates to a method for pump flow/self-flow switching control and false alarm suppression of a ship cooling system by adopting self-flow circulation.
Background
One of the most important systems of the ship power plant is used for condensing exhaust steam generated by the main turbine during the cooling system, and maintaining the vacuum degree (pressure) required by the operation of the main turbine. The cooling system is a ship navigation system with large sea water flux and maximum pipeline caliber, has large noise in the operation process, is positioned in front in the ship noise source sequencing, and is especially the noise of the rotary circulating water pump.
At present, a pump flow/self flow switching control logic of a ship self-flow cooling system mainly obtains a corresponding cooling water inlet temperature threshold value according to a ship navigation working condition table lookup, then judges the magnitude relation between the cooling water inlet temperature threshold value and the actual cooling water inlet temperature, further determines the pump flow/self flow switching state of the ship self-flow cooling system, has an ambiguous control target, cannot fully exert self-flow cooling capacity, and is difficult to solve the problems of frequent pump flow/self flow switching and false condenser pressure alarm caused by the ship navigation dynamic variable working condition.
Disclosure of Invention
In view of one or more of the above drawbacks or improvements of the prior art, the present invention proposes a pump flow/self-flow switching control method for a self-flow cooling system of a vessel, the method being based on a self-flow cooling system of a vessel, the vessel comprising a turbine, the self-flow cooling system of a vessel comprising, in order in a cooling water path: the device comprises an inlet connecting pipe, an inlet guide sleeve, a circulating water pump, a condenser, an outlet connecting pipe, an outlet guide sleeve and an air extractor;
The flow pressure head of the head-on water flow in the ship navigation is converted into the internal flow static pressure of a cooling system, the seawater is driven to flow through the condenser, and the exhaust steam generated by the turbine acting is condensed;
The circulating water pump can increase the flow of the cooling seawater;
the condenser comprises a pressure sensor which can measure a specific value of the static pressure of the internal flow, and is characterized in that the method comprises the following steps:
step 1: the pressure sensor of the condenser performs signal acquisition to obtain a pressure signal P2 which is used as a first input signal of the control method;
Step 2: taking the ship navigation working condition as an input signal for determining a condenser pressure threshold value, wherein the condenser pressure threshold value is determined through tests of self-flowing/pump-flow switching processes under different navigation working conditions of the ship, the condenser pressure threshold value signal is also taken as a second input signal of the control method, meanwhile, the pressure threshold values of the self-flowing cutting pump flow and the pump flow cutting self-flowing processes are set to be two different values, and a self-flowing cutting pump flow pressure threshold value Pa and a pump flow cutting self-flowing pressure threshold value Pb are set;
Step 3: judging whether the ship self-flow cooling system is in a self-flow working condition, if so, entering a step 4, otherwise, entering a step 5;
Step 4: checking the working state of the air extractor, ensuring that the air extractor is in a full-open state, judging whether the pressure signal P2 is larger than a self-flow cutting pump flow pressure threshold Pa, if so, switching the self-flow working condition of the ship self-flow cooling system into a pump flow working condition, and entering a step 6, otherwise, keeping the self-flow working condition, and entering a step 8;
Step 5: checking the working state of the air extractor, ensuring that the air extractor is in a full-open state, judging whether the pressure signal P2 is smaller than a pump flow cutting self-flow pressure threshold Pb, if so, switching the pump flow working condition of the ship self-flow cooling system into a self-flow working condition, and entering a step 7, otherwise, keeping the pump flow working condition, and entering a step 9;
step 6: judging whether the pressure signal P2 is smaller than a self-flow pump flow pressure threshold Pb, if so, switching the pump flow working condition of the ship self-flow cooling system into a self-flow working condition, and entering a step 8, otherwise, keeping the pump flow working condition, and entering a step 9;
step 7: judging whether the pressure signal P2 is larger than a self-flow pump flow pressure threshold Pa, if so, switching the self-flow working condition of the ship self-flow cooling system into a pump flow working condition, entering a step 9, otherwise, keeping the self-flow working condition, and entering the step 8;
Step 8: judging whether the pressure filtering signal P2 is smaller than a preset lower limit value Pc of the condenser pressure, if yes, reducing the opening of the working steam valve of the air extractor, otherwise, keeping the working steam valve of the air extractor fully open;
step 9: the pump flow/self flow switching control flow ends.
Further: in the step 1, the collected pressure signal P1 is digitally filtered to obtain a pressure signal P2, where the numerical filtering is specifically average filtering.
Further: in the step 2, the ship navigation working condition is used as an input signal, and the condenser pressure threshold value is obtained through table lookup.
Further, after said step 8, a method of suppressing transient overpressure false alarm phenomena of the condenser pressure of said self-flow cooling system of the vessel is further performed,
The method comprises the following steps:
Step S1, the pressure sensor of the condenser performs signal acquisition to obtain a pressure signal P2 which is used as a first input signal of the inhibition method;
Step S2, taking the ship sailing working condition and an overpressure alarm threshold Pu corresponding to the sailing working condition as a second input signal and a third input signal of the inhibition method;
step S3, judging whether the pressure signal P2 of the condenser reaches the overpressure alarm threshold Pu, if so, entering a step S4, otherwise, entering a step S7 without any action;
step S4, judging whether the overpressure of the condenser is caused by the ship speed dynamic variable working condition process, if so, entering a step S5, otherwise, immediately alarming, and entering a step S7;
step S5, in order to reduce the influence of overpressure of the condenser in the working condition conversion process, the air extractor is introduced in advance for intervention, namely on the basis of guaranteeing the stable working of the air extractor, the air extraction capacity is increased in the working condition raising process, the air extraction capacity is reduced in the working condition lowering process, and meanwhile, the delay alarm time t is set;
step 6, judging whether the condenser pressure is recovered to be normal within the delay alarm time t, if so, canceling the alarm, otherwise, immediately alarming;
Step S7: ending the flow.
Further: and the value of the delay alarm time t is determined according to the ship navigation working condition.
In general, the above technical solutions conceived by the present invention have the beneficial effects compared with the prior art including:
(1) The pump flow/self flow switching control purpose of the ship self-flow cooling system is clear, the self-flow cooling margin is larger, the self-flow cooling capacity is fully exerted, and the problem of frequent pump flow/self-flow switching caused by the dynamic variable working condition of ship navigation is solved;
(2) The transient noise caused by frequent switching of pump flow and self flow can be reduced by the inhibition measure of the transient overpressure false alarm phenomenon of the condenser pressure in the ship navigational speed dynamic variable working condition process, and the influence of pressure mutation on equipment deterioration can be relieved.
Drawings
FIG. 1 is a self-flowing cooling system in an embodiment of the invention;
FIG. 2 is a graph of the dynamic response process of the free-flowing cooling system in an embodiment of the invention;
FIG. 3 is a diagram of a pump/self-flow switching method with pressure as a control target in an embodiment of the invention;
FIG. 4 is a diagram of a method for suppressing transient overpressure false alarm of condenser pressure during dynamic variable operating conditions in an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Examples:
The self-flow cooling system provided by the invention is a novel cooling system, and different from the traditional cooling system, the self-flow cooling system works independently of the operation of a circulating water pump, can greatly reduce the noise of the cooling system, and is an important development direction of the cooling system of the ship power plant. As shown in fig. 1, the self-flow cooling system is generally composed of an inlet connecting pipe, a guide cover, an outlet connecting pipe, a guide cover, a circulating water pump, a condenser, a connecting pipeline, accessories and the like, wherein the inlet connecting pipe and the guide cover at the side of a ship convert the flowing pressure head of the water flow on the front side of the ship in navigation into the internal flow static pressure of the cooling system, drive cooling seawater to flow through the condenser, condense exhaust steam generated by the main turbine acting, and meet the cooling requirement of a ship power device.
In the dynamic sailing process of the ship, the operation working condition of the power device directly influences the exhaust steam flow (heat load) entering the condenser, and the cooling seawater flow required by the condenser is determined, namely the cooling requirement of the power device is determined. The running condition of the power device also determines the rotating speed of the propeller of the power device, the rotating speed of the propeller directly influences the navigational speed of the ship, the flow of the cooling seawater through the self-flowing system depends on the navigational speed of the ship, and the flow of the cooling seawater of the self-flowing system is increased along with the increase of the navigational speed of the ship, namely the cooling capacity of the self-flowing system is increased. As shown in fig. 2, the power device/the ship speed/the self-flowing cooling system are dynamically coupled, and the working states of the power device and the ship speed/the self-flowing cooling system are delayed and delayed in sequence in the dynamic sailing process of the ship, namely, the power device needs to be operated according to a working condition change instruction to heat a load, the ship speed is changed after the heat load is changed, the cooling seawater supply capacity of the self-flowing cooling system can be changed after the ship speed is changed, the characteristic results in faster change of the cooling requirement of the power device, the cooling water supply capacity of the self-flowing cooling system is slowly changed under the condition that the ship speed is dominant, compared with the condition that the self-flowing cooling system can provide insufficient cooling seawater flow, the self-flowing circulation is required to be quickly switched into a pump flow mode, and the circulating water pump is started to increase the cooling seawater flow.
In addition, in the process of dynamic navigation of the ship, particularly in the process of accelerating operation of the ship, the pressure of the condenser is instantaneously too high due to rapid change of the heat load, so that the false alarm phenomenon of the pressure of the condenser is caused, the pressure of the condenser can be restored to be within the normal operation range after the process of accelerating operation is finished, and the process of immediately alarming and switching to the pump flow control process is not needed.
The pump flow/self-flow switching control and false alarm suppression schemes of the ship self-flow cooling system, which are provided in the scheme and take the condenser pressure as a direct control target, are shown in fig. 3 and 4. It can be seen that the control purpose of pump flow/self flow switching of the self-flow cooling system of the ship is clear, the self-flow cooling margin is larger, the self-flow cooling capacity can be fully exerted, and the problems of frequent pump flow/self flow switching and false condenser pressure alarm caused by the dynamic variable working condition of ship navigation are solved.
The pump flow/self flow switching control of the ship self-flow cooling system taking the pressure of the condenser as a control target can solve the problems of parameter fluctuation of a pressure sensor and pump flow/self flow switching back and forth of a pressure threshold boundary of the condenser, and mainly comprises the following steps:
step 1: taking the influence of parameter fluctuation of a condenser pressure sensor into consideration, carrying out digital filtering (such as average value filtering and the like) on the collected pressure signal P1 to obtain a pressure filtering signal P2 which is used as an input signal of a pump flow/self flow switching control logic of the ship self-flow cooling system;
Step 2: taking the influence degree of the minimum pump flow on the condenser pressure under different operation conditions into consideration, taking the ship navigation conditions as input signals for determining condenser pressure thresholds, determining the condenser pressure thresholds of the self-flow/pump flow switching process under the different ship navigation conditions through experiments, taking the condenser pressure threshold signals as input signals of pump flow/self-flow switching control logic of a ship self-flow cooling system, and simultaneously setting the pressure thresholds of the self-flow switching pump flow and the pump flow switching self-flow process into two different values, such as a self-flow switching pump flow pressure threshold Pa and a pump flow switching self-flow pressure threshold Pb;
Step 3: judging whether the self-flow cooling system of the ship is in a self-flow working condition, if so, entering a step 4, otherwise, entering a step 5;
Step 4: checking the working state of the air extractor, ensuring that the air extractor is in a full-open state, judging whether the pressure filtering signal P2 is greater than the self-flow pump flow pressure threshold Pa, if so, switching the self-flow working condition of the ship self-flow cooling system into a pump flow working condition, and entering a step 6, otherwise, keeping the self-flow working condition, and entering a step 8;
Step 5: checking the working state of the air extractor, ensuring that the air extractor is in a full-open state, judging whether the pressure filtering signal P2 is smaller than the pump flow cutting self-flow pressure threshold Pb, if so, switching the pump flow working condition of the ship self-flow cooling system into the self-flow working condition, and entering the step 7, otherwise, keeping the pump flow working condition, and entering the step 9;
Step 6: judging whether the pressure filtering signal P2 is smaller than a self-flow pump flow pressure threshold Pb, if so, switching the pump flow working condition of the ship self-flow cooling system into a self-flow working condition, and entering a step 8, otherwise, keeping the pump flow working condition, and entering a step 9;
Step 7: judging whether the pressure filtering signal P2 is larger than the self-flow pump flow pressure threshold Pa, if so, switching the self-flow working condition of the ship self-flow cooling system into a pump flow working condition, entering a step 9, otherwise, keeping the self-flow working condition, and entering the step 8;
step 8: and judging whether the pressure filtering signal P2 is smaller than a preset lower limit value Pc of the condenser pressure, if so, reducing the opening of the working steam valve of the air extractor, otherwise, keeping the working steam valve of the air extractor fully open.
Step 9: the pump flow/self flow switching control flow ends.
The transient noise caused by frequent switching of pump flow and self flow can be reduced by the inhibition measure of the transient overpressure false alarm phenomenon of the condenser pressure in the ship navigational speed dynamic variable working condition process, and the influence of pressure mutation on equipment deterioration is relieved, and the method mainly comprises the following steps:
step 1: taking the influence of parameter fluctuation of a condenser pressure sensor into consideration, carrying out digital filtering (such as average value filtering and the like) on an acquired pressure signal P1 (the same as the above) to obtain a pressure filtering signal P2 (the same as the above) which is used as an input signal of a condenser pressure overpressure false alarm inhibition measure in a ship navigational speed dynamic variable working condition process;
Step 2: taking an overpressure alarm threshold Pu corresponding to a ship sailing working condition as an input signal of an overpressure false alarm inhibition measure of the condenser pressure in a ship sailing dynamic variable working condition process;
step 3: judging whether the pressure filtering signal P2 of the condenser reaches an overpressure alarm threshold Pu corresponding to a sailing working condition, if so, entering a step 4, otherwise, entering a step 7 without any action;
step 4: judging whether the overpressure of the condenser is caused by the process of dynamically changing the navigational speed of the ship or not, if so, entering the step 5, otherwise, immediately alarming, and entering the step 7;
Step 5: in order to reduce the influence of overpressure of a condenser in the working condition conversion process, the air extractor is introduced in advance for intervention, namely, on the basis of guaranteeing the stable working of the air extractor, the air extraction capacity is increased in the working condition raising process, the air extraction capacity is reduced in the working condition lowering process, and meanwhile, the delay alarm time t (the specific numerical value is determined according to the ship sailing working condition) is set;
step 6: judging whether the pressure of the condenser is recovered to be normal within the delay alarm time t, if so, canceling the alarm, otherwise, immediately alarming;
Step 7: and the suppression flow of the transient overpressure false alarm phenomenon of the condenser pressure is finished.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (5)
1. The method is based on a ship self-flow cooling system, wherein the ship comprises a steam turbine, and the ship self-flow cooling system sequentially comprises the following components in a cooling waterway: the device comprises an inlet connecting pipe, an inlet guide sleeve, a circulating water pump, a condenser, an outlet connecting pipe, an outlet guide sleeve and an air extractor;
The flow pressure head of the head-on water flow in the ship navigation is converted into the internal flow static pressure of a cooling system, the seawater is driven to flow through the condenser, and the exhaust steam generated by the turbine acting is condensed;
The circulating water pump can increase the flow of the cooling seawater;
the condenser comprises a pressure sensor which can measure a specific value of the static pressure of the internal flow, and is characterized in that the method comprises the following steps:
step 1: the pressure sensor of the condenser performs signal acquisition to obtain a pressure signal P2 which is used as a first input signal of the control method;
Step 2: taking the ship navigation working condition as an input signal for determining a condenser pressure threshold value, wherein the condenser pressure threshold value is determined through tests of self-flowing/pump-flow switching processes under different navigation working conditions of the ship, the condenser pressure threshold value signal is also taken as a second input signal of the control method, meanwhile, the pressure threshold values of the self-flowing cutting pump flow and the pump flow cutting self-flowing processes are set to be two different values, and a self-flowing cutting pump flow pressure threshold value Pa and a pump flow cutting self-flowing pressure threshold value Pb are set;
Step 3: judging whether the ship self-flow cooling system is in a self-flow working condition, if so, entering a step 4, otherwise, entering a step 5;
Step 4: checking the working state of the air extractor, ensuring that the air extractor is in a full-open state, judging whether the pressure signal P2 is larger than a self-flow cutting pump flow pressure threshold Pa, if so, switching the self-flow working condition of the ship self-flow cooling system into a pump flow working condition, and entering a step 6, otherwise, keeping the self-flow working condition, and entering a step 8;
Step 5: checking the working state of the air extractor, ensuring that the air extractor is in a full-open state, judging whether the pressure signal P2 is smaller than a pump flow cutting self-flow pressure threshold Pb, if so, switching the pump flow working condition of the ship self-flow cooling system into a self-flow working condition, and entering a step 7, otherwise, keeping the pump flow working condition, and entering a step 9;
step 6: judging whether the pressure signal P2 is smaller than a self-flow pump flow pressure threshold Pb, if so, switching the pump flow working condition of the ship self-flow cooling system into a self-flow working condition, and entering a step 8, otherwise, keeping the pump flow working condition, and entering a step 9;
step 7: judging whether the pressure signal P2 is larger than a self-flow pump flow pressure threshold Pa, if so, switching the self-flow working condition of the ship self-flow cooling system into a pump flow working condition, entering a step 9, otherwise, keeping the self-flow working condition, and entering the step 8;
Step 8: judging whether the pressure filtering signal P2 is smaller than a preset lower limit value Pc of the condenser pressure, if yes, reducing the opening of the working steam valve of the air extractor, otherwise, keeping the working steam valve of the air extractor fully open;
step 9: the pump flow/self flow switching control flow ends.
2. The method according to claim 1, characterized in that: in the step 1, the collected pressure signal P1 is digitally filtered to obtain a pressure signal P2, where the numerical filtering is specifically average filtering.
3. The method according to claim 2, characterized in that: in the step 2, the ship navigation working condition is used as an input signal, and the condenser pressure threshold value is obtained through table lookup.
4. The method according to claim 3, characterized in that after said step 8, a method of suppressing transient overpressure false alarms of the condenser pressure of the self-flow cooling system of the vessel is further performed,
The method comprises the following steps:
Step S1, the pressure sensor of the condenser performs signal acquisition to obtain a pressure signal P2 which is used as a first input signal of the inhibition method;
Step S2, taking the ship sailing working condition and an overpressure alarm threshold Pu corresponding to the sailing working condition as a second input signal and a third input signal of the inhibition method;
step S3, judging whether the pressure signal P2 of the condenser reaches the overpressure alarm threshold Pu, if so, entering a step S4, otherwise, entering a step S7 without any action;
step S4, judging whether the overpressure of the condenser is caused by the ship speed dynamic variable working condition process, if so, entering a step S5, otherwise, immediately alarming, and entering a step S7;
step S5, in order to reduce the influence of overpressure of the condenser in the working condition conversion process, the air extractor is introduced in advance for intervention, namely on the basis of guaranteeing the stable working of the air extractor, the air extraction capacity is increased in the working condition raising process, the air extraction capacity is reduced in the working condition lowering process, and meanwhile, the delay alarm time t is set;
step 6, judging whether the condenser pressure is recovered to be normal within the delay alarm time t, if so, canceling the alarm, otherwise, immediately alarming;
Step S7: ending the flow.
5. The method according to claim 4, wherein: and the value of the delay alarm time t is determined according to the ship navigation working condition.
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| CN110282110A (en) * | 2019-07-30 | 2019-09-27 | 中国船舶重工集团公司第七一九研究所 | Ship water cooling system water feed apparatus |
| CN112623175A (en) * | 2020-12-28 | 2021-04-09 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Dual-mode switching method for pump flow mode and gravity flow mode of ship cooling system |
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| JPH0858693A (en) * | 1994-08-26 | 1996-03-05 | Yanmar Diesel Engine Co Ltd | Cooling water sensor for marine engine |
| JP2006052865A (en) * | 2004-08-09 | 2006-02-23 | Tokyo Electric Power Co Inc:The | Circulating water system, circulating water system control method, computer program and flow rate measurement method |
| JP6267526B2 (en) * | 2014-01-29 | 2018-01-24 | 株式会社Ｓｕｂａｒｕ | Flow control device for fluid pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110282110A (en) * | 2019-07-30 | 2019-09-27 | 中国船舶重工集团公司第七一九研究所 | Ship water cooling system water feed apparatus |
| CN112623175A (en) * | 2020-12-28 | 2021-04-09 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Dual-mode switching method for pump flow mode and gravity flow mode of ship cooling system |
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