Boiler circulation pump water level control method

A water level control and control method technology, applied in the direction of controlling water supply, preheating, steam generation, etc., can solve the problems of manual completion of once-through boilers, and achieve the effect of increasing the input rate of automation

Pending Publication Date: 2022-01-04

HUANENG CHAOHU POWER GENERATION

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AI-Extracted Technical Summary

Problems solved by technology

[0003] According to the above problems, the present invention discloses a method for controlling the water level of a furnace circulation pump. Based on the characteristics of industrial automatic control in thermal power plants, etc., from the perspective of intelligence, automation and safety, the water level adjustment, dry, The automatic completion of wet sta...

Method used

[0120] The above three processes are written into the DCS in a modular manner, and human-computer interaction is realized in the form ...

Abstract

The invention discloses a boiler circulation pump water level control method, and mainly relates to an automatic control technology for water level adjustment and dry and wet state conversion in the starting and stopping process of industrial once-through boilers (with boiler circulation pumps) of a thermal power plant and the like. Based on the characteristic of industrial automatic control of thermal power plants and the like, from the perspective of intelligence, automation and security, water level adjustment, dry state and wet state conversion and the like of the once-through boiler (with the boiler circulation pump) are automatically completed, the personnel operation amount is reduced, the safety risk is reduced, and a foundation is laid for one-key start and stop of a unit in the future.

Application Domain

Water feed control

Technology Topic

Automatic controlProcess engineering +3

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Examples

Experimental program(1)

Example Embodiment

[0049] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following examples are intended to illustrate the invention, but not to limit the scope of the invention.

[0050] The invention is based on industrial automatic control characteristics such as thermal power plants. From intelligent, automatic, safe, the present invention has realized DC boilers (with furnace pump) water level adjustment, dry, wet conversion, etc., which disclose a furnace pump level. The control method is applied to a DC boiler with a furnace water circulation pump.

[0051] The furnace pump water level control method includes:

[0052] Judging the permission conditions of the water level control of DC boilers;

[0053]When the current operation parameters of the DC boiler reach the allowable condition of the water level control of DC boiler, the water level of the furnace water circulation pump is automatically adjusted;

[0054] During the automatic adjustment of the water level of the furnace water, it is determined to determine the completion conditions of the water level control of the DC boiler;

[0055] According to the current water level parameters of the current furnace water circulating pump, when it is determined that the current operation parameter reaches the condition, the water level of the furnace water circulation pump in the current stage is automatically adjusted.

[0056] Based on the above concept, it is necessary to explain that the allowable conditions for judging the water level control of the DC boiler include:

[0057] The first operating state of the DC boiler is preset, and whether the current operating state of the DC boiler meets the first operating state;

[0058] When the current operational state of the DC boiler meets the conditions of the first operating state, it is judged that the DC boiler reaches the allowable conditions of the water level control of DC boilers.

[0059] DC boiler water level control completion conditions include:

[0060] The second operating state of the DC boiler is preset, and the current operational state of the DC boiler after the automatic adjustment process of the furnace water circulation is satisfied;

[0061] When the current operating state of the DC boiler meets the conditions of the second operating state, it is judged that the DC boiler reaches the finance conditions of the water level control of DC boiler.

[0062] Based on the above description, in which the first operating state can be combined according to the preset DC boiler operation parameters, a plurality of different DC boiler water level control allowed conditions, different furnace water circulating pump water levels corresponding to different first operating conditions Automatic adjustment process.

[0063] The second operating state can operate the parameter value according to the preset DC boiler, set a variety of different DC boiler water level control completion conditions, and the automatic adjustment process of different furnace water circulation pumps corresponds to different second operating states.

[0064] In some embodiments of the invention, the furnace pump water level control method can be specifically:

[0065] When it is judged that the current operational state of the DC boiler satisfies the first operating state, the automatic adjustment process corresponding to the current first operating state is performed;

[0066] According to a plurality of different first operating states, the operating parameter threshold of different DC boilers is correspondingly preset, and the current operation parameter value and the operating parameter threshold of the DC boiler are compared;

[0067] According to the operating parameter threshold, the current running parameter value is adjusted to adjust the current operating state of the DC boiler until the current operational state of the DC boiler meets the conditions of the second operating state corresponding to the current automatic adjustment process, the water level of the furnace water circulation pump is automatically adjusted. The process ends.

[0068] In actual production applications, the technical solution of the present invention is mainly divided into three parts in the technical solution of the present invention, one is that the separator storage tank water level is automatically adjusted, and the second is to rotate automatically by the wet state, three It is automatically operated by a dry state-to-state, and ultimately achieves the water level adjustment, dry and wet conversion, and the like.

[0069] 1. Separator storage tank water level automatic adjustment (eg figure 1 )

[0070] The allowable condition for the water level control of the DC boiler is: the first operating state is the water circulation pump start, the furnace pump outlet adjustment reaches the first opening section, the main water power door is closed.

[0071] Run parameter thresholds include:

[0072] The first change rate of the separator water level, the separator storage tank water level first change rate, the main vapor voltage first change rate, the splitter first water position, the first water level of the water tank and the second water space of the water storage tank.

[0073] The separator storage tank water level automatic adjustment process includes: judging the current separator water level change rate and separator water level first change rate, separator storage tank water level change rate and separator storage tank water level first change rate ;

[0074] If the separator water level change rate and the water level change rate of the separator storage tank are smaller than the separator water level first change rate and the separator storage tank water level first change rate, the main feed water power door bypass;

[0075] If the water level change rate of the separator is larger than the water level change rate of the separator is larger than the first rate of change in the separator water level and the first change in the water level of the separator, the main pressure change rate of the DC boiler is continuously judged and the main vapor voltage is first. The size of the change rate;

[0076] If the main pressure change rate of the DC boiler is greater than the main vapor voltage first change rate, the size of the separator water level and the separator first water position, the water storage tank and the first water level of the water storage tank are continuous;

[0077] If the separator water level and the water storage tank are less than the first water level of the separator and the first water level of the water storage tank, the main water supply power door bypass door, continue to perform the current separator of the DC boiler and the water level change rate and the water level change of the separator storage tank The rate of comparison with respect to the first change rate of the separator water level and the first change rate of the separator storage tank water level;

[0078] If the main pressure change rate of the DC boiler is smaller than the main vapor voltage first change rate, the size of the separator water level and the separator first water position, the water storage tank water level, and the second water level of the water storage tank are continuous;

[0079] If the separator water level and the water storage tank are larger than the first water level of the separator and the first water level of the water storage tank, the small master gives the water power door bypass.

[0080] 2. Automatic operation of the wet rotation (such as figure 2 )

[0081] The allowable conditions for the water level control of DC boilers are: the unit of DC boiler reaches the first load interval, and the unit time the coal is reached in the first coal volume and remains stable. The DC boiler is operated in the wet state, the main water supply door is closed, the steam pump The speed of the speed reaches the first speed;

[0082] Run parameter thresholds include:

[0083] The first water position of the separator, the third water position of the water storage tank, the main steam flow and the water flow of the boiler, the main steam flow and the second difference of the water flow on the boiler, the furnace pump outlet adjustment door first opening.

[0084] Automatic operation of the wet rotation of the donor state:

[0085] Judging the comparative separator water level and separator first water position, water storage tank water level and the third water level of the water storage tank;

[0086] If the separator water level and the water storage tank are less than the first water level of the separator and the third water space of the water storage tank, the opening degree of the furnace pump outlet adjustment is continued to the first opening of the furnace pump outlet adjustment;

[0087] If the opening of the furnace pump outlet adjustment is greater than the first opening of the furnace pump outlet, the furnace is turned on the pump outlet, and the preset time is long, and continue to determine the comparative separator water level and the separator first water position, water storage tank water level And the size of the third water level of the water storage tank;

[0088] If the opening of the furnace pump outlet adjustment is smaller than the first opening of the furnace pump outlet, the full-strain furnace is pumped out of the electric door, the operating furnace pump and inputs the water to the water, and the automatic operation is carried out by the wet rotation.

[0089] Judging the comparative separator water level and separator first water position, water storage tank water level, and the third water level of the water storage tank, judges that the comparative main steam flow rate and the boiler on the boiler flow and the first water flow of the main steam flow and boiler Value, the main steam flow rate and the size of the second difference between the boiler on the boiler;

[0090] If the main steam flow rate and the water flow difference of the boiler are greater than the first difference between the main steam flow and the water flow of the boiler, the main supply water bypass, and continue to determine the comparative main steam flow and boiler flow difference and main steam flow The size of the first difference with the water flow of the boiler, the main steam flow and the second difference between the boiler on the boiler;

[0091] If the main steam flow rate is small in the boiler on the second difference between the main steam flow and the water flow of the boiler, then the small master water bypass, and continue to determine the comparative main steam flow and boiler flow difference and main steam flow In line with the first difference of water flow on the boiler, the main steam flow rate and the second difference between the water flow on the boiler.

[0092] It should be noted that after the sequence is over, the operator should monitor the change in the outlet of the separator and adjust the overheating bias in time.

[0093] After the operating furnace is pump, the operator should focus on monitoring the changes in parameters such as the warm surface of the boiler.

[0094] 3. Automatically operate from dry-state-to-state (such as image 3 )

[0095] The allowable condition for the water level control of DC boiler is: the unit of DC boiler reaches the first load interval and remains stable, the boiler is operated in the dry state, the DC boiler is less than the first heat, the main water supply door has been closed, the steam pump has been quit Run parallel.

[0096] Run parameter thresholds include:

[0097] The second water position of the water storage tank, the furnace pump outlet adjustment, the main steam flow and the first difference of water flow on the boiler, the main steam flow rate and the second difference value of the water flow on the boiler.

[0098] Automatic operation by the dry state-to-state:

[0099] Release the water, and start the furnace water circulation pump, determine the size of the water level and the second water level of the water storage tank;

[0100] If the water storage tank is greater than the second water level of the water storage tank, the blast pump outlet adjustment is opened, and it is determined that the comparison furnace pump outlet door opening degree and the size of the furnace pump outlet adjustment;

[0101] If the furnace pump outlet adjustment opening is smaller than the first opening of the furnace pump outlet adjustment, the preset time is continuously preset, and the comparative storage tank water level and the second water level of the water storage tank are continuously determined;

[0102] If the furnace pump outlet adjustment opening is greater than the first opening of the furnace pump outlet, it is judged that the comparative main steam flow rate and the first difference of the main steam flow and the boiler on the boiler, the main steam flow and boiler Size relationship between the second difference of the upper water flow;

[0103] If the main steam flow rate and the water flow difference of the boiler are greater than the first difference between the main steam flow and the water flow of the boiler, the main supply water bypass, and continue to determine the comparative main steam flow and boiler flow difference and main steam flow The size of the first difference with the water flow of the boiler, the main steam flow and the second difference between the boiler on the boiler;

[0104] If the main steam flow rate is small in the boiler on the second difference between the main steam flow and the water flow of the boiler, then the small master water bypass, and continue to determine the comparative main steam flow and boiler flow difference and main steam flow The size of the first difference with the water flow of the boiler, the main steam flow and the second difference between the boiler on the boiler;

[0105] When the difference between the main steam flow rate and the boiler is in the main vapor flow and the first difference between the boiler on the boiler, the main steam flow is between the second difference between the boiler flow, the completion is completed, And perform the separator storage tank water level automatic adjustment.

[0106] It should be noted that in actual production applications, the setting of the parameter threshold in the above three adjustment processes:

[0107]The first opening degree interval of the furnace pump outlet is 50% ± 5%;

[0108] The first load interval is 200 ~ 240mW;

[0109] The first coal volume range is 120 ~ 130t / h;

[0110] The first speed value is 4200 rpm;

[0111] The first heat is 10 ° C;

[0112] The first change rate of the separator water level is 0%;

[0113] The first change rate of the water level of the separator storage tank is 0%;

[0114] The first change rate of the main steam pressure is 0%;

[0115] The first water level of the separator is 3m;

[0116] The first water level of the water storage tank is 6m, the second water level of the water storage tank is 5.5m; the third water level in the water storage tank is 6.5m;

[0117] The first opening degree of the furnace pump outlet adjustment is 50%;

[0118] The first difference between the main steam flow and the boiler is 100T / h, and the second difference between the main steam flow and the boiler is 50t / h;

[0119] The preset time is 5 s.

[0120] The three processes described above are written in the DCS in modules, and human-computer interaction, reduce personnel operating, reduce operational risks, and improve automation rates.

[0121] In the DC boiler (with a furnace pump), during the stop, the water level adjustment, dry, and wet conversion is a very critical operation. The furnace pump water level control method of the present invention is based on the industrial automatic control characteristics such as thermal power plants. From the perspective, automatic, safe point of view, achieve the water level adjustment, dry, and wet conversion of the DC boiler (with the furnace), reduce the amount of operation, reduce safety risks, and set the ground to the future unit Base.

[0122] The beneficial effect of the present invention is:

[0123] 1) Effective resolve the security risks caused by personnel operating mistakes.

[0124] 2) Improve operational efficiency and save time.

[0125] 3) Improve automation input rate.

[0126] The above is merely the preferred embodiment of the present invention, and it should be noted that several improvements and replacements can be made without departing from the technical principles of the present invention, these improvements and replacements can be made without departing from the technical principles of the invention. It should also be regarded as the scope of protection of the present invention.

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