CN102620278B - Method and device for controlling feedwater flow of boiler - Google Patents
Method and device for controlling feedwater flow of boiler Download PDFInfo
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- CN102620278B CN102620278B CN201210115872.3A CN201210115872A CN102620278B CN 102620278 B CN102620278 B CN 102620278B CN 201210115872 A CN201210115872 A CN 201210115872A CN 102620278 B CN102620278 B CN 102620278B
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Abstract
The invention discloses a method and a device for controlling the feedwater flow of a boiler. The method comprises the following steps of: when a pressure value of a separator is greater than or equal to a first preset threshold value, turning off a drain valve of a water delivery system of a water storage tank, and enlarging an economizer inlet feedwater regulating valve; when a current value of a starting circulation pump is smaller than a second preset threshold value, increasing the feedwater flow and the flow of cold water which passes through the starting circulation pump; and/or when temperature rise values of inlet and outlet headers of a ceiling super-heater are smaller than a third preset threshold value or when a water level value of the water storage tank of the separator is greater than a fourth preset threshold value, decreasing the openness of the economizer inlet feedwater regulating valve, and increasing the openness of the drain valve of the water delivery system of the water storage tank, and when the water level value of the water storage tank is equal to a fifth preset threshold value, stopping regulating the openness of the economizer inlet feedwater regulating valve and the openness of the drain valve of the water delivery system of the water storage tank. By adoption of the scheme, in the depressurization pipe-blowing process of a supercritical once-through boiler, the water level of the separator can be controlled within a reasonable range, and accidents of water fullness and water shortage of the water storage tank of the separator are eliminated.
Description
Technical field
The present invention relates to thermal power generation field, particularly relate to a kind of control method and device of boiler feedwater flow.
Background technology
The new unit of installing is because the reason of the aspects such as manufacture, installation, storage, transportation, remaining the grains of sand, iron scale, iron filings, welding slag, the Chemical cleaning thing that do not rinse out to some extent in superheater, reheater system and jet chimney, by boiler blow piping, can remove above-mentioned foreign material, avoid after unit operation, these materials are present in heating surface, cause heating surface pipe obstruction, booster and high temperature corrosion, or be brought in steam turbine, will jeopardize the safe operation of Turbo-generator Set.Boiler blow piping is large-scale thermal power machine group very important link in Capital Construction Debugging process.
Before boiler blow piping, can draw interim pipeline from formal steam pipeline system, on vapour-discharge tube, an impermanent valve can be installed, be called for short: face chongmen.Operations staff utilizes and faces purging and the pressure accumulation that chongmen carrys out control piper.
Traditional boiler feedwater flow is controlled and is adopted single-pass amount and triflux method for controlling water level, but this method cannot meet feedwater flow fluctuation in blowpipe process.For 1000MW ultra supercritical direct current cooker, after facing chongmen and opening, the feedwater flow of boiler economizer entrance was elevated to 1100-1200t/h from the 600t/h facing chongmen is opened in 60 seconds, the variation of this flow is huge, and face after chongmen unlatching, separator is interior due to pressure generation fast-descending, must there is vaporization phenomenon, cause occurring in separator false water level, the accident of separator water tank full water occurs, cutting off the water supply, traditional control method uncontrollable boiler separator water level in rational scope.
Summary of the invention
Based on this, while being necessary for ultra supercritical direct current cooker, uncontrollable boiler separator water level, at rational scope inner question, provides a kind of control method and device of boiler feedwater flow.
A control method for boiler feedwater flow, comprises step:
Step 1: obtain separator pressure, relatively separator pressure and the first pre-set threshold value size, when separator pressure is more than or equal to the first pre-set threshold value, close the hydrophobic valve of storage tank water-carriage system, strengthens economizer entrance feed-regulating valve door;
Step 2: obtain the electric current that starts circulating pump, when the current value of startup circulating pump is less than the second pre-set threshold value, strengthen the flow of feedwater flow and startup circulating pump subcooled water; And/or the temperature rise of obtaining steam air inlet-outlet-housing, when the temperature rise of steam air inlet-outlet-housing is less than the 3rd pre-set threshold value, enter step 4, otherwise enter step 3;
Step 3: obtain separator water storage tank water level, when separator water storage tank water level is greater than the 4th pre-set threshold value, enter step 4, otherwise return to step 2;
Step 4: reduce economizer entrance feed-regulating valve door aperture, strengthen the hydrophobic valve aperture of storage tank water-carriage system, when water storage tank water level reaches the 5th pre-set threshold value, stop regulating the hydrophobic valve aperture of economizer entrance feed-regulating valve door and storage tank water-carriage system.
The control method of above-mentioned boiler feedwater flow, except considering separator water storage tank water level signal, also using the temperature rise of the electric current of boiler startup circulating pump, steam inlet header as judgment basis, has improved the accuracy that feedwater flow is controlled greatly., ultra supercritical direct current cooker overcritical at 600MW, 1000MW grade, in step-down blowpipe process, can guarantee that separator water level is controlled in rational scope, the accident of separator water tank full water does not occur, cutting off the water supply.
A control device for boiler feedwater flow, comprising:
Open module, be used for obtaining separator pressure, relatively separator pressure and the first pre-set threshold value are big or small, when separator pressure is more than or equal to the first pre-set threshold value, hydrophobic valve to storage tank water-carriage system sends shutdown command, to economizer entrance feed-regulating valve door, sends and strengthens order;
Monitoring modular, for obtaining the electric current that starts circulating pump, when the current value of startup circulating pump is less than the second pre-set threshold value, sends and starts the order of subcooled water flow to circulating pump;
Judge module, for judging whether the steam air inlet-outlet-housing temperature rise of obtaining is less than the 3rd pre-set threshold value or judges whether separator water storage tank water level is greater than the 4th pre-set threshold value, if so, carries out closing module order;
Closing module, for sending and reduce aperture order to economizer entrance feed-regulating valve door, the hydrophobic valve transmission increasing aperture order to storage tank water-carriage system, when water storage tank water level reaches the 5th pre-set threshold value, stops fill order.
The control device of above-mentioned boiler feedwater flow,, ultra supercritical direct current cooker overcritical at 600MW, 1000MW grade is in step-down blowpipe process, can guarantee that separator water level is controlled in rational scope, the accident of separator water tank full water does not occur, cutting off the water supply.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the control method embodiment mono-of boiler feedwater flow of the present invention;
Fig. 2 is the schematic flow sheet of the control method embodiment bis-of boiler feedwater flow of the present invention;
Fig. 3 is the schematic flow sheet of the control method embodiment tri-of boiler feedwater flow of the present invention
Fig. 4 is the structural representation of the control device of boiler feedwater flow of the present invention.
The specific embodiment
The present invention program's basic goal, is to want to realize overcritical, ultra supercritical direct current cooker in step-down blowpipe process, can guarantee that separator water level is controlled in rational scope, the accident of separator water tank full water does not occur, cutting off the water supply.Central idea of the present invention, is in facing chongmen opening and closing process, controls boiler feedwater flow, improves the accuracy that feedwater flow is controlled, and avoids occurring separator water tank full water, the accident of cutting off the water supply.
Below first each embodiment of boiler feedwater flow control method of the present invention is elaborated.
The present invention mainly controls boiler feedwater flow from two aspects, is respectively: in supercritical once-through boiler step-down blowpipe process, face in chongmen opening procedure the control method of boiler feedwater flow; In supercritical once-through boiler step-down blowpipe process, face in chongmen closing process the control method of boiler feedwater flow.
Embodiment mono-
The control method of a kind of boiler feedwater flow that the embodiment of the present invention one provides, is both to have obtained the electric current that starts circulating pump, and electric current is judged, obtains again the temperature rise of steam air inlet-outlet-housing, and temperature rise is judged.
Referring to Fig. 1, be control method embodiment mono-schematic flow sheet of a kind of boiler feedwater flow of the present invention, it comprises step:
Step S110: obtain separator pressure, relatively separator pressure and the first pre-set threshold value size, when separator pressure is more than or equal to the first pre-set threshold value, close the hydrophobic valve of storage tank water-carriage system, strengthens economizer entrance feed-regulating valve door;
Step S120: obtain the electric current that starts circulating pump, when the current value of startup circulating pump is less than the second pre-set threshold value, strengthen the flow of feedwater flow and startup circulating pump subcooled water; Obtain the temperature rise of steam air inlet-outlet-housing, when the temperature rise of steam air inlet-outlet-housing is less than the 3rd pre-set threshold value, enter step S140, otherwise enter step S130;
Step S130: obtain separator water storage tank water level, when separator water storage tank water level is greater than the 4th pre-set threshold value, enter step S140, otherwise return to step S120;
Step S140: reduce economizer entrance feed-regulating valve door aperture, strengthen the hydrophobic valve aperture of storage tank water-carriage system, when water storage tank water level reaches the 5th pre-set threshold value, stop regulating the hydrophobic valve aperture of economizer entrance feed-regulating valve door and storage tank water-carriage system.
First, obtain separator pressure.When separator pressure is more than or equal to the first pre-set threshold value, opens and face chongmen.This threshold values is preferably set to 6-8MPa, also can be set as other values.After facing chongmen and opening, system pressure fast-descending, water storage tank water level fast rise, at this time close at once the hydrophobic valve of storage tank draining system, strengthen economizer entrance feed-regulating valve door, these two actions can be carried out simultaneously, or order is carried out in no particular order, at least open greatly to 70-80%, but be not limited to this aperture.
In unlatching, face after chongmen, obtain the electric current that starts circulating pump, constantly the electric current and the second pre-set threshold value that start circulating pump are compared, threshold values scope is 30-32A, can be also other scopes.When the electric current that starts circulating pump is during lower than this threshold values, show that working medium in the pump housing has started to have the phenomenon of vaporization, now should strengthen feedwater flow and start the flow of circulating pump subcooled water.
It is the process that boiler heat storage discharges that blowpipe faces the process that chongmen opens, and easily occurs that boiler separator full water is to the phenomenon of superheater.For fear of this phenomenon, constantly the temperature rise of steam air inlet-outlet-housing and the 3rd pre-set threshold value are compared, threshold values can be set as 5-6 ℃, also can be other range temperature.Object is in order to control the high 8-10 ℃ of saturation temperature that this temperature rise ratio system pressure is corresponding.When this temperature rise is less than the 3rd pre-set threshold value, represent that the degree of superheat is declining, steam had closed on the edge of water, should start to close to face chongmen.
Wherein, the accuracy of controlling in order to improve feedwater flow, obtains the electric current step that starts circulating pump and the temperature rise step of obtaining steam air inlet-outlet-housing, and preferred a kind of mode is to carry out simultaneously.In addition can first obtain electric current step, then obtain temperature rise step; Or first obtain temperature rise step, then obtain electric current step.
When the temperature rise of steam air inlet-outlet-housing is less than the 3rd pre-set threshold value, closes and face chongmen.Now, reduce gradually economizer entrance feed-regulating valve door aperture, strengthen gradually the hydrophobic valve aperture of storage tank water-carriage system, when water storage tank water level reaches the 5th pre-set threshold value, stop regulating the hydrophobic valve aperture of economizer entrance feed-regulating valve door and storage tank water-carriage system.Otherwise judge whether separator water storage tank water level is greater than the 4th pre-set threshold value, if, close and face chongmen, reduce gradually economizer entrance feed-regulating valve door aperture, strengthen gradually the hydrophobic valve aperture of storage tank water-carriage system, when water storage tank water level reaches the 5th pre-set threshold value, stop regulating the hydrophobic valve aperture of economizer entrance feed-regulating valve door and storage tank water-carriage system.Otherwise return to obtain and start circulating pump electric current step.
In the temperature rise that judges steam air inlet-outlet-housing, whether be less than the 3rd pre-set threshold value and judge whether separator water storage tank water level is greater than in the 4th pre-set threshold value, the accuracy of controlling in order to improve feedwater flow, preferred a kind of mode is first to judge temperature rise, does not meet and judges water storage tank water level again.In addition, also can first judge water storage tank water level, not meet and judge again temperature rise; Can also only to one of them, judge.
Can also be in supercritical once-through boiler step-down blowpipe process, before facing chongmen and opening, increase the control method of boiler feedwater flow.
When separator pressure is less than, preset threshold values, do not open and face chongmen.This threshold values is preferably set to 6-8MPa, also can be set as other values.Now, the rate of water make-up of boiler and displacement are constant, are in a kind of metastable state.Regulate the hydrophobic valve aperture of economizer entrance feed-regulating valve door and storage tank water-carriage system, economizer entrance feed-regulating valve accelerator control system rate of water make-up wherein, the displacement of the draining valve control system of boiler startup system, and these two valves are all linear adjustable, thereby maintain separator water storage tank water level in the 5th pre-set threshold value.The 5th pre-set threshold value, sets as required.
Embodiment bis-
The control method of a kind of boiler feedwater flow that the embodiment of the present invention two provides, the temperature rise of only obtaining steam air inlet-outlet-housing, judges temperature rise, does not obtain the electric current that starts circulating pump.
Referring to Fig. 2, be control method embodiment bis-schematic flow sheets of a kind of boiler feedwater flow of the present invention, it comprises step:
Step S110: obtain separator pressure, relatively separator pressure and the first pre-set threshold value size, when separator pressure is more than or equal to the first pre-set threshold value, close the hydrophobic valve of storage tank water-carriage system, strengthens economizer entrance feed-regulating valve door;
Step S220: obtain the temperature rise of steam air inlet-outlet-housing, when the temperature rise of steam air inlet-outlet-housing is less than the 3rd pre-set threshold value, enter step S140, otherwise enter step S130;
Step S130: obtain separator water storage tank water level, when separator water storage tank water level is greater than the 4th pre-set threshold value, enter step S140, otherwise return to step S220;
Step S140: reduce economizer entrance feed-regulating valve door aperture, strengthen the hydrophobic valve aperture of storage tank water-carriage system, when water storage tank water level reaches the 5th pre-set threshold value, stop regulating the hydrophobic valve aperture of economizer entrance feed-regulating valve door and storage tank water-carriage system.
First, obtain separator pressure.When separator pressure is more than or equal to the first pre-set threshold value, opens and face chongmen.This threshold values is preferably set to 6-8MPa, also can be set as other values.After facing chongmen and opening, system pressure fast-descending, water storage tank water level fast rise, at this time close at once the hydrophobic valve of storage tank draining system, strengthen economizer entrance feed-regulating valve door, these two actions can be carried out simultaneously, or order is carried out in no particular order, at least open greatly to 70-80%, but be not limited to this aperture.
It is the process that boiler heat storage discharges that blowpipe faces the process that chongmen opens, and easily occurs that boiler separator full water is to the phenomenon of superheater.For fear of this phenomenon, constantly the temperature rise of steam air inlet-outlet-housing and the 3rd pre-set threshold value are compared, threshold values can be set as 5-6 ℃, also can be other range temperature.Object is in order to control the high 8-10 ℃ of saturation temperature that this temperature rise ratio system pressure is corresponding.When this temperature rise is less than the 3rd pre-set threshold value, represent that the degree of superheat is declining, steam had closed on the edge of water, should start to close to face chongmen.
When the temperature rise of steam air inlet-outlet-housing is less than the 3rd pre-set threshold value, closes and face chongmen.Now, reduce gradually economizer entrance feed-regulating valve door aperture, strengthen gradually the hydrophobic valve aperture of storage tank water-carriage system, when water storage tank water level reaches the 5th pre-set threshold value, stop regulating the hydrophobic valve aperture of economizer entrance feed-regulating valve door and storage tank water-carriage system.Otherwise judge whether separator water storage tank water level is greater than the 4th pre-set threshold value, if, close and face chongmen, reduce gradually economizer entrance feed-regulating valve door aperture, strengthen gradually the hydrophobic valve aperture of storage tank water-carriage system, when water storage tank water level reaches the 5th pre-set threshold value, stop regulating the hydrophobic valve aperture of economizer entrance feed-regulating valve door and storage tank water-carriage system.Otherwise return to step S220.
The accuracy of controlling in order to improve feedwater flow, preferred a kind of mode is first to judge temperature rise, step S220, does not meet and judges water storage tank water level again, i.e. step S130.In addition, also can first carry out step S130, not meet, then carry out step S220; Can also only carry out one of them step.
Can also be in supercritical once-through boiler step-down blowpipe process, before facing chongmen and opening, increase the control method of boiler feedwater flow.
When separator pressure is less than, preset threshold values, do not open and face chongmen.This threshold values is preferably set to 6-8MPa, also can be set as other values.Now, the rate of water make-up of boiler and displacement are constant, are in a kind of metastable state.Regulate the hydrophobic valve aperture of economizer entrance feed-regulating valve door and storage tank water-carriage system, economizer entrance feed-regulating valve accelerator control system rate of water make-up wherein, the displacement of the draining valve control system of boiler startup system, and these two valves are all linear adjustable, thereby maintain separator water storage tank water level in the 5th pre-set threshold value.The 5th pre-set threshold value, sets as required.
Embodiment tri-
The control method of a kind of boiler feedwater flow that the embodiment of the present invention one provides, is only to obtain the electric current that starts circulating pump, and electric current is judged, does not obtain the temperature rise of steam air inlet-outlet-housing.
Referring to Fig. 3, be control method embodiment tri-schematic flow sheets of a kind of boiler feedwater flow of the present invention, it comprises step:
Step S110: obtain separator pressure, relatively separator pressure and the first pre-set threshold value size, when separator pressure is more than or equal to the first pre-set threshold value, close the hydrophobic valve of storage tank water-carriage system, strengthens economizer entrance feed-regulating valve door;
Step S320: obtain the electric current that starts circulating pump, when the current value of startup circulating pump is less than the second pre-set threshold value, strengthen the flow of feedwater flow and startup circulating pump subcooled water;
Step S130: obtain separator water storage tank water level, when separator water storage tank water level is greater than the 4th pre-set threshold value, enter step S140, otherwise return to step S320;
Step S140: reduce economizer entrance feed-regulating valve door aperture, strengthen the hydrophobic valve aperture of storage tank water-carriage system, when water storage tank water level reaches the 5th pre-set threshold value, stop regulating the hydrophobic valve aperture of economizer entrance feed-regulating valve door and storage tank water-carriage system.
First, obtain separator pressure.When separator pressure is more than or equal to the first pre-set threshold value, opens and face chongmen.This threshold values is preferably set to 6-8MPa, also can be set as other values.After facing chongmen and opening, system pressure fast-descending, water storage tank water level fast rise, at this time close at once the hydrophobic valve of storage tank draining system, strengthen economizer entrance feed-regulating valve door, these two actions can be carried out simultaneously, or order is carried out in no particular order, at least open greatly to 70-80%, but be not limited to this aperture.
In unlatching, face after chongmen, constantly the electric current and the second pre-set threshold value that start circulating pump are compared, threshold values scope is 30-32A, can be also other scopes.When the electric current that starts circulating pump is during lower than this threshold values, show that working medium in the pump housing has started to have the phenomenon of vaporization, now should strengthen feedwater flow and start the flow of circulating pump subcooled water, and enter next step, otherwise directly enter next step.
Judge whether separator water storage tank water level is greater than the 4th pre-set threshold value, if, close and face chongmen, reduce gradually economizer entrance feed-regulating valve door aperture, strengthen gradually the hydrophobic valve aperture of storage tank water-carriage system, when water storage tank water level reaches the 5th pre-set threshold value, stop regulating the hydrophobic valve aperture of economizer entrance feed-regulating valve door and storage tank water-carriage system.Otherwise return to step S320.
Can also be in supercritical once-through boiler step-down blowpipe process, before facing chongmen and opening, increase the control method of boiler feedwater flow.
When separator pressure is less than, preset threshold values, do not open and face chongmen.This threshold values is preferably set to 6-8MPa, also can be set as other values.Now, the rate of water make-up of boiler and displacement are constant, are in a kind of metastable state.Regulate the hydrophobic valve aperture of economizer entrance feed-regulating valve door and storage tank water-carriage system, economizer entrance feed-regulating valve accelerator control system rate of water make-up wherein, the displacement of the draining valve control system of boiler startup system, and these two valves are all linear adjustable, thereby maintain separator water storage tank water level in the 5th pre-set threshold value.The 5th pre-set threshold value, sets as required.
According to the control method of a kind of boiler feedwater flow of the invention described above, the invention provides a kind of control device of boiler feedwater flow.By applying the control device of a kind of boiler feedwater flow of the present invention, can improve the accuracy that feedwater flow is controlled.
Referring to Fig. 4, be the control device structural representation of a kind of boiler feedwater flow of the present invention, comprising:
Monitoring modular 402, for obtaining the electric current that starts circulating pump, when the current value of startup circulating pump is less than the second pre-set threshold value, sends and starts the order of subcooled water flow to circulating pump;
Specifically be implemented as follows:
Open module, for being more than or equal to when separator pressure, preset threshold values for the moment, system pressure fast-descending, water storage tank water level fast rise, hydrophobic valve to storage tank water-carriage system sends shutdown command at once, to economizer entrance feed-regulating valve door, send and strengthen order, at least open greatly to 70-80%.Optimal way is that two orders send simultaneously, in addition, can before or after the hydrophobic valve to storage tank water-carriage system send shutdown command, to economizer entrance feed-regulating valve door, send and strengthen order.
It is the process that boiler heat storage discharges that blowpipe faces the process that chongmen opens, and easily occurs that boiler separator full water is to the phenomenon of superheater, therefore constantly pays close attention to the temperature rise of steam air inlet-outlet-housing and starts the electric current of circulating pump.When this temperature rise is less than the 3rd pre-set threshold value, represent that the degree of superheat is declining, steam had closed on the edge of water, should start to close to face chongmen.Closing module sends and reduces aperture order to economizer entrance feed-regulating valve door, and this aperture order is to reduce gradually, controls accurately and sets as required; Closing module sends the order of increasing aperture to the hydrophobic valve of storage tank water-carriage system, and this aperture order is to strengthen gradually, controls accurately and sets as required, when water storage tank water level reaches the 5th pre-set threshold value, stops fill order.
In execution, open after module, when starting the current value of circulating pump and be less than the second pre-set threshold value, show that working medium in the pump housing has started to have the phenomenon of vaporization, monitoring modular sends and starts the order of subcooled water flow to circulating pump.
In execution, open after module, whether the steam air inlet-outlet-housing temperature rise that judge module judgement is obtained is less than the 3rd pre-set threshold value or judges whether separator water storage tank water level is greater than the 4th pre-set threshold value, if not, represent not reach the condition of closing, need not move closing module, otherwise, carry out closing module order.Closing module sends and reduces aperture order to economizer entrance feed-regulating valve door, and this aperture order is to reduce gradually, controls accurately and sets as required; Closing module sends the order of increasing aperture to the hydrophobic valve of storage tank water-carriage system, and this aperture order is to strengthen gradually, controls accurately and sets as required, when water storage tank water level reaches the 5th pre-set threshold value, stops fill order.
Monitoring modular and judge module can send order simultaneously; Also can first monitoring module monitors, send monitoring order, then judge module judges, send judgement order; Can also judge by judge module, the monitoring modular again that do not satisfy condition is monitored; Or monitoring modular is not set, and judge module directly sends order.In judge module, can only to temperature rise, judge, or only separator water storage tank water level be judged; Also can to temperature rise and separator water storage tank water level, judge simultaneously.
The first pre-set threshold value, the second pre-set threshold value, the 3rd pre-set threshold value, the 4th pre-set threshold value, the 5th pre-set threshold value are set according to specific needs, preferably, the first pre-set threshold value scope can be made as 6-8MPa, the second pre-set threshold value scope can be made as 30-32A, the 3rd pre-set threshold value scope can be made as 5-6 ℃, and described the 4th pre-set threshold value scope is for can be made as 7-8m.
The control device of a kind of boiler feedwater flow of the present invention also comprises adjustment module, for being less than when separator pressure, preset threshold values for the moment, hydrophobic valve to economizer entrance feed-regulating valve door and storage tank water-carriage system sends the order of adjusting aperture, economizer entrance feed-regulating valve accelerator control system rate of water make-up wherein, the displacement of the draining valve control system of boiler startup system, and these two valves are all linear adjustable, thereby maintain separator water storage tank water level in rational scope.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (7)
1. a control method for boiler feedwater flow, comprises step:
Step 1: obtain separator pressure, relatively separator pressure and the first pre-set threshold value size, when separator pressure is more than or equal to the first pre-set threshold value, opens and face chongmen, close the hydrophobic valve of storage tank water-carriage system, strengthen economizer entrance feed-regulating valve door;
Step 2: obtain the electric current that starts circulating pump, when the current value of startup circulating pump is less than the second pre-set threshold value, strengthen the flow of feedwater flow and startup circulating pump subcooled water; And/or the temperature rise of obtaining steam air inlet-outlet-housing, when the temperature rise of steam air inlet-outlet-housing is less than the 3rd pre-set threshold value, enter step 4, otherwise enter step 3;
Step 3: obtain separator water storage tank water level, when separator water storage tank water level is greater than the 4th pre-set threshold value, enter step 4, otherwise return to step 2;
Step 4: close and face chongmen, reduce economizer entrance feed-regulating valve door aperture, the hydrophobic valve aperture that strengthens storage tank water-carriage system, when water storage tank water level reaches the 5th pre-set threshold value, stops regulating the hydrophobic valve aperture of economizer entrance feed-regulating valve door and storage tank water-carriage system.
2. the control method of boiler feedwater flow according to claim 1, it is characterized in that, when separator pressure is less than the first pre-set threshold value, regulate the hydrophobic valve aperture of economizer entrance feed-regulating valve door and storage tank water-carriage system, when water storage tank water level reaches the 5th pre-set threshold value, stop regulating the hydrophobic valve aperture of economizer entrance feed-regulating valve door and storage tank water-carriage system.
3. the control method of boiler feedwater flow according to claim 1 and 2, is characterized in that, described in obtain the temperature rise step that starts the electric current step of circulating pump and obtain steam air inlet-outlet-housing and carry out simultaneously.
4. the control method of boiler feedwater flow according to claim 1 and 2, it is characterized in that, described the first pre-set threshold value scope is 6-8MPa, and described the second pre-set threshold value scope is 30-32A, described the 3rd pre-set threshold value scope is 5-6 ℃, and described the 4th pre-set threshold value scope is 7-8m.
5. a control device for boiler feedwater flow, comprising:
Open module, be used for obtaining separator pressure, relatively separator pressure and the first pre-set threshold value are big or small, when separator pressure is more than or equal to the first pre-set threshold value, transmission is opened and is faced chongmen instruction, hydrophobic valve to storage tank water-carriage system sends shutdown command, to economizer entrance feed-regulating valve door, sends and strengthens order;
Monitoring modular, for obtaining the electric current that starts circulating pump, when the current value of startup circulating pump is less than the second pre-set threshold value, sends the order of startup subcooled water flow to starting circulating pump;
Judge module, for judging whether the steam air inlet-outlet-housing temperature rise of obtaining is less than the 3rd pre-set threshold value or judges whether separator water storage tank water level is greater than the 4th pre-set threshold value, if so, carries out closing module order;
Closing module, faces chongmen instruction for sending to close, and to economizer entrance feed-regulating valve door, sends and reduces aperture order, and the hydrophobic valve transmission increasing aperture order to storage tank water-carriage system, when water storage tank water level reaches the 5th pre-set threshold value, stops fill order.
6. the control device of boiler feedwater flow according to claim 5, it is characterized in that, also comprise adjustment module, when separator pressure is less than the first pre-set threshold value, hydrophobic valve to economizer entrance feed-regulating valve door and storage tank water-carriage system sends the order of adjusting aperture, when water storage tank water level reaches the 5th pre-set threshold value, stop fill order.
7. according to the control device of the boiler feedwater flow described in claim 5 or 6, it is characterized in that, to starting, circulating pump sends startup subcooled water flow order to monitoring modular and the order of judge module execution closing module is carried out simultaneously.
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| CN102954461B (en) * | 2012-11-15 | 2014-07-16 | 中国船舶重工集团公司第七一九研究所 | Self-adaptive marine direct current boiler pressure control system and realization method thereof |
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