Method and device for controlling process of converting wet state into dry state of once-through boiler

Abstract

The invention provides a once-through boiler wet-to-dry process control method and device, and relates to the technical field of automatic control. The method comprises the steps that a boiler water pump outlet adjusting valve is automatically turned down till the opening degree of the boiler water pump outlet adjusting valve is smaller than a second preset adjusting valve opening degree and the boiler water pump outlet adjusting valve is not automatically turned down within a first preset duration; the 361 adjusting valve is automatically turned down until the opening degree of the 361 adjusting valve is smaller than a fourth preset adjusting valve opening degree and the 361 adjusting valve is not automatically turned down within a second preset duration; and the process of converting the wet state into the dry state of the once-through boiler is completed by controlling the superheat degree of the outlet of the steam-water separator to be the first preset temperature. The device executes the method. According to the method and device provided by the embodiment of the invention, the smooth process of converting the wet state into the dry state of the once-through boiler can be ensured.

Description

Technical Field

[0001] The present invention relates to the field of automatic control technology, and in particular to a method and device for controlling a wet-to-dry state process of a once-through boiler. Background Art

[0002] With the increasing proportion of renewable energy in the power grid, thermal power units are generally facing the need for deep peak shaving. Currently, supercritical and ultra-supercritical units can generally achieve deep peak shaving at 30% BMCR. However, with the continued development of renewable energy, these units will also face the need for deep peak shaving at 20% BMCR or even 20% THA. To meet the deep peak shaving requirements of 20% BMCR or 20% THA, once-through boilers in supercritical and ultra-supercritical units generally have two methods: dry or wet deep shaving. Operating at 20% BMCR or 20% THA in dry conditions often exceeds the boiler's hydrodynamically safe operating range, resulting in significantly increased waterwall temperature deviations. Operating at 20% BMCR or 20% THA in wet conditions can be achieved by discharging some hot water or recycling it through boiler water recirculation pumps. This increased feedwater rate expands the boiler's hydrodynamically safe load range, but there is a need for automated switching, specifically, converting once-through boilers from wet to dry conditions.

[0003] The existing technology achieves automated transition by changing the amount of coal, which actually causes changes in the power generation during the transition process. If the unit is put into coordinated control mode, it will cause changes in the main steam pressure, and then lead to changes in the boiler coal feed amount, forming a process of reducing coal-automatically adding coal-reducing coal-automatically adding coal, affecting the smooth progress of the transition process and prolonging the transition time. Summary of the Invention

[0004] In response to the problems in the prior art, an embodiment of the present invention provides a method and device for controlling the process of converting a wet state to a dry state of a once-through boiler, which can at least partially solve the problems in the prior art.

[0005] In one aspect, the present invention provides a method for controlling a wet-to-dry state process of a once-through boiler, comprising:

[0006] If it is determined that the transition from the wet state to the dry state of the once-through boiler meets the pre-control conditions, and the opening of the boiler water pump outlet regulating valve is greater than the first preset regulating valve opening, the regulating valve 361 is turned on for manual control and the boiler water pump outlet regulating valve is turned on for automatic control, and the preset batch water reduction flow is periodically obtained to realize automatic closing of the boiler water pump outlet regulating valve until the opening of the boiler water pump outlet regulating valve is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve is no longer automatically closed within the first preset time;

[0007] If it is determined that the opening of the 361 regulating valve is greater than the third preset regulating valve opening, the boiler water pump outlet regulating valve is turned on for manual control and the 361 regulating valve is turned on for automatic control, and the preset batch water reduction flow rate is periodically obtained to realize automatic closing of the 361 regulating valve until the opening of the 361 regulating valve is less than the fourth preset regulating valve opening and the 361 regulating valve is no longer automatically closed within the second preset time period;

[0008] By controlling the superheat degree at the outlet of the steam-water separator to be the first preset temperature, the process of converting the wet state of the once-through boiler to the dry state is completed.

[0009] Among them, it is determined that the wet-to-dry state of the once-through boiler meets the pre-control conditions, including:

[0010] Determine that the load is the wet maximum load; the wet feed water flow rate of the wet maximum load is greater than the sum of the Bunsen flow rate and the margin, and the sum of the boiler water pump outlet regulating valve opening and the 361 regulating valve opening is less than the fifth preset regulating valve opening;

[0011] Start the transition timing, switch the main steam pressure at the steam-water separator outlet to constant pressure control, control the main steam pressure to be greater than the first preset pressure, and keep the load stable for the second preset time.

[0012] The periodic acquisition of the preset batch water reduction flow rate includes:

[0013] Determine a preset total water reduction flow rate required to reduce the once-through boiler from a wet state to a dry state, and determine preset batch water reduction flow rates to be reduced in batches based on the preset total water reduction flow rate;

[0014] Importing the preset batch water reduction flow rate in batches one by one according to the preset time period until all the preset total water reduction flow rates are imported.

[0015] The method for controlling the wet-to-dry state transition process of a once-through boiler further includes:

[0016] When the third preset time is reached after the direct current boiler wet-to-dry state process is completed, close the 361 regulating valve and the electric valve behind the regulating valve, close the electric shut-off valve at the boiler water pump outlet, open the boiler water pump warm-up valve and the start-up system warm-up pipe valve, and switch the steam-water separator outlet superheat temperature to automatic control.

[0017] Among them, the 361 regulating valves are No. 1 361 regulating valve and No. 2 361 regulating valve.

[0018] Wherein, the first preset regulating valve opening is equal to the third preset regulating valve opening, and the second preset regulating valve opening is equal to the fourth preset regulating valve opening;

[0019] The fifth preset regulating valve opening is greater than the first preset regulating valve opening, and the first preset regulating valve opening is greater than the second preset regulating valve opening.

[0020] In one aspect, the present invention provides a control device for a wet-to-dry state process of a once-through boiler, comprising:

[0021] The first control unit is configured to, if it is determined that the transition from the wet state to the dry state of the once-through boiler satisfies the pre-control condition and the opening of the boiler water pump outlet regulating valve is greater than the first preset regulating valve opening, activate the regulating valve 361 for manual control and the boiler water pump outlet regulating valve for automatic control, and periodically obtain the preset batch water reduction flow rate to automatically close the boiler water pump outlet regulating valve until the opening of the boiler water pump outlet regulating valve is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve is no longer automatically closed within the first preset time period;

[0022] The second control unit is configured to, if it is determined that the opening of the regulating valve 361 is greater than the third preset regulating valve opening, activate the manual control of the boiler water pump outlet regulating valve and the automatic control of the regulating valve 361, and periodically obtain the preset batch water reduction flow rate to realize automatic closing of the regulating valve 361 until the opening of the regulating valve 361 is less than the fourth preset regulating valve opening and the regulating valve 361 is no longer automatically closed within the second preset time period;

[0023] The third control unit is used to control the superheat degree of the steam-water separator outlet to be a first preset temperature, thereby completing the process of converting the wet state of the direct current boiler to a dry state.

[0024] In another aspect, an embodiment of the present invention provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the following method is implemented:

[0025] If it is determined that the transition from the wet state to the dry state of the once-through boiler meets the pre-control conditions, and the opening of the boiler water pump outlet regulating valve is greater than the first preset regulating valve opening, the regulating valve 361 is turned on for manual control and the boiler water pump outlet regulating valve is turned on for automatic control, and the preset batch water reduction flow is periodically obtained to realize automatic closing of the boiler water pump outlet regulating valve until the opening of the boiler water pump outlet regulating valve is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve is no longer automatically closed within the first preset time;

[0026] If it is determined that the opening of the 361 regulating valve is greater than the third preset regulating valve opening, the boiler water pump outlet regulating valve is turned on for manual control and the 361 regulating valve is turned on for automatic control, and the preset batch water reduction flow rate is periodically obtained to realize automatic closing of the 361 regulating valve until the opening of the 361 regulating valve is less than the fourth preset regulating valve opening and the 361 regulating valve is no longer automatically closed within the second preset time period;

[0027] By controlling the superheat degree at the outlet of the steam-water separator to be the first preset temperature, the process of converting the wet state of the once-through boiler to the dry state is completed.

[0028] An embodiment of the present invention provides a computer-readable storage medium, including:

[0029] The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following method is implemented:

[0030] If it is determined that the transition from the wet state to the dry state of the once-through boiler meets the pre-control conditions, and the opening of the boiler water pump outlet regulating valve is greater than the first preset regulating valve opening, the regulating valve 361 is turned on for manual control and the boiler water pump outlet regulating valve is turned on for automatic control, and the preset batch water reduction flow is periodically obtained to realize automatic closing of the boiler water pump outlet regulating valve until the opening of the boiler water pump outlet regulating valve is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve is no longer automatically closed within the first preset time;

[0031] If it is determined that the opening of the 361 regulating valve is greater than the third preset regulating valve opening, the boiler water pump outlet regulating valve is turned on for manual control and the 361 regulating valve is turned on for automatic control, and the preset batch water reduction flow rate is periodically obtained to realize automatic closing of the 361 regulating valve until the opening of the 361 regulating valve is less than the fourth preset regulating valve opening and the 361 regulating valve is no longer automatically closed within the second preset time period;

[0032] By controlling the superheat degree at the outlet of the steam-water separator to be the first preset temperature, the process of converting the wet state of the once-through boiler to the dry state is completed.

[0033] An embodiment of the present invention further provides a computer program product, comprising a computer program. When the computer program is executed by a processor, the computer program implements the following method:

[0034] If it is determined that the transition from the wet state to the dry state of the once-through boiler meets the pre-control conditions, and the opening of the boiler water pump outlet regulating valve is greater than the first preset regulating valve opening, the regulating valve 361 is turned on for manual control and the boiler water pump outlet regulating valve is turned on for automatic control, and the preset batch water reduction flow is periodically obtained to realize automatic closing of the boiler water pump outlet regulating valve until the opening of the boiler water pump outlet regulating valve is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve is no longer automatically closed within the first preset time;

[0035] If it is determined that the opening of the 361 regulating valve is greater than the third preset regulating valve opening, the boiler water pump outlet regulating valve is turned on for manual control and the 361 regulating valve is turned on for automatic control, and the preset batch water reduction flow rate is periodically obtained to realize automatic closing of the 361 regulating valve until the opening of the 361 regulating valve is less than the fourth preset regulating valve opening and the 361 regulating valve is no longer automatically closed within the second preset time period;

[0036] By controlling the superheat degree at the outlet of the steam-water separator to be the first preset temperature, the process of converting the wet state of the once-through boiler to the dry state is completed.

[0037] The embodiment of the present invention provides a direct current boiler wet state to dry state process control method and device. If it is determined that the direct current boiler wet state to dry state meets the pre-control conditions and the boiler water pump outlet regulating valve opening is greater than the first preset regulating valve opening, then the 361 regulating valve is opened for manual control and the boiler water pump outlet regulating valve is opened for automatic control, and the preset batch water reduction flow is periodically obtained to realize the automatic closing of the boiler water pump outlet regulating valve until the boiler water pump outlet regulating valve opening is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve is no longer automatically closed within the first preset time length; if it is determined that the 361 regulating valve is opened If the degree of superheat at the outlet of the steam-water separator is greater than the third preset valve opening, the boiler water pump outlet regulating valve is opened for manual control and the 361 regulating valve is opened for automatic control, and the preset batch water reduction flow is obtained periodically to realize automatic closing of the 361 regulating valve until the 361 regulating valve opening is less than the fourth preset valve opening and the 361 regulating valve is no longer automatically closed within the second preset time; the superheat at the outlet of the steam-water separator is controlled to be the first preset temperature, and the process of converting the wet state to the dry state of the direct current boiler is completed, which can ensure that the process of converting the wet state to the dry state of the direct current boiler proceeds smoothly and reduces the time delay during the transition process. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0039] Figure 1 This is a schematic diagram of a once-through boiler startup system provided by an embodiment of the present invention.

[0040] Figure 2 It is a flow chart of a method for controlling a wet-to-dry state process of a once-through boiler provided in one embodiment of the present invention.

[0041] Figure 3 It is a structural schematic diagram of a wet-to-dry state process control device for a once-through boiler provided in one embodiment of the present invention.

[0042] Figure 4 A schematic diagram of the physical structure of a computer device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of this application can be combined with each other in any manner.

[0044] Explanation of related terms:

[0045] Wet state: The working medium water at the outlet of the water-cooled wall of the direct current boiler is in a water-containing state.

[0046] Dry state: The working medium water at the outlet of the water-cooled wall of the direct current boiler is in a superheated steam state. In practice, the superheat degree is generally required to be greater than 5°C.

[0047] Boiler water circulation pump: This pump is used to pump part or all of the liquid water at the water-cooled wall outlet of a once-through boiler in a wet state to the economizer inlet or water-cooled wall inlet.

[0048] like Figure 1 The figure shows a schematic diagram of a direct current boiler startup system provided by an embodiment of the present invention. A direct current boiler is a boiler in which, under the pressure of a feed water pump, the feed water undergoes three stages of heating, evaporation, and superheating in the water-cooled wall at one time and then is converted into superheated steam with a certain pressure and temperature. A steam drum is not required. This type of boiler is called a direct current boiler. The direct current boiler startup system includes a feed water pump, a high-pressure heater, a main feed water electric valve, a feed water bypass regulating valve, a subcooled water electric valve, a boiler water circulation pump, a boiler water pump recirculation valve, a boiler water pump outlet flow meter, a boiler water pump outlet electric shut-off valve, a boiler water pump outlet regulating valve, a feed water flow meter, an economizer, a water-cooled wall, a boiler water pump warm-up valve, a startup system warm-up pipe valve, a steam-water separator, a water storage tank, a No. 1 361 regulating valve, a No. 1 361 regulating valve rear electric valve, a No. 2 361 regulating valve, a No. 2 361 regulating valve rear electric valve, an atmospheric expansion tank, a drain pump, and a drain flow meter.

[0049] The feed water pump is connected to the high-pressure heater, and the high-pressure heater is connected to the subcooled water electric valve and the main feed water electric valve respectively. The subcooled water electric valve is connected in parallel with a feed water bypass regulating valve. The subcooled water electric valve is connected to the boiler water circulation pump. The boiler water circulation pump is connected in parallel with a boiler water pump recirculation valve. The outlet end of the boiler water circulation pump is connected in sequence to the boiler water pump outlet flow meter, the boiler water pump outlet electric shut-off valve, and the boiler water pump outlet regulating valve. The outlet end of the boiler water pump outlet regulating valve is connected to the outlet end of the main feed water electric valve or the feed water bypass regulating valve and the feed water flow meter. The feed water flow meter is connected to the economizer. The economizer is connected to the water-cooled wall, the starting system warm-up pipe valve, and the boiler water pump warm-up valve respectively. The boiler water pump warm-up valve is connected to the outlet end of the boiler water circulation pump or the boiler water pump recirculation valve. The starting system warm-up pipe valve is connected to the first outlet end of the water storage tank.

[0050] The water-cooled wall is connected to the steam-water separator, the steam-water separator is connected to the inlet end of the water storage tank, the first outlet end of the water storage tank is connected in parallel with No. 361 regulating valve No. 1 and No. 361 regulating valve No. 2, the second outlet end of the water storage tank is connected to the inlet end of the boiler water circulation pump or the boiler water pump recirculation valve, No. 361 regulating valve No. 1 is connected to the electric valve after No. 361 regulating valve No. 1, the No. 361 regulating valve No. 2 is connected to the electric valve after No. 361 regulating valve No. 2, the electric valve after No. 361 regulating valve No. 1 and the electric valve after No. 361 regulating valve No. 2 are jointly connected to the inlet end of the atmospheric expansion tank, the outlet end of the atmospheric expansion tank is connected to two parallel drain pumps, and the outlet end of the drain pump is connected to the drain flowmeter.

[0051] The once-through boiler starting system is further described as follows:

[0052] The feed water pressurized by the feed water pump and heated by the high-pressure heater is mixed with the water flow at the outlet of the boiler water circulation pump, enters the economizer as feed water, and then enters the water-cooled wall. The total feed water flow is measured by the feed water flow meter.

[0053] The working medium heated by the economizer and the water wall enters the steam-water separator. In wet working conditions, the working medium entering the steam-water separator contains water, the liquid water flows to the water storage tank, and the steam flows to the superheater, etc. ( Figure 1 (Not shown) Liquid water entering the water storage tank can be pressurized by the boiler water circulation pump and returned to the economizer inlet, forming boiler water recirculation, increasing the inlet feedwater flow rate of the water-cooled wall. The heat of this boiler water also re-enters the water-cooled wall. The flow rate of this boiler water is measured by the boiler water pump outlet flowmeter.

[0054] The feed water entering the water storage tank can also enter the atmospheric expansion tank through the 361 valve, and then be discharged to the condenser through the drain pump ( Figure 1 The heat of this liquid water is either carried away by the condenser or directly discharged, preventing heat recovery. The boiler water circulation pump has its own recirculation piping and a boiler water pump recirculation valve, a boiler water pump outlet flowmeter, an electric shutoff valve at the boiler water pump outlet, and a boiler water pump outlet regulating valve. The boiler water pump outlet regulating valve automatically controls the water level in the water storage tank.

[0055] When the boiler water circulating pump is shut down, the pump can be warmed up via valve 5 to ensure a suitable temperature for startup. The water inlet to the boiler water circulating pump requires a certain degree of subcooling to prevent impeller cavitation. Therefore, a stream of cold water from the feedwater line is mixed with saturated water from the water storage tank to reduce the temperature. This can be controlled by the opening of the cold water electric valve. The water storage tank also has an external discharge path. Water can be discharged to the atmospheric expansion tank via regulating valves 1 and 2, as well as the electric valves behind regulating valves 1 and 2. The automatic operation of valve 361 also controls the water level in the water storage tank.

[0056] When the water level in the atmospheric expansion tank is high, two drain pumps can be used to drain the liquid water to the condenser or wastewater disposal tank. During dry conditions, the start-up system warm-up valve can be opened to maintain the temperature of the pipeline from valve 361 to the water storage tank, keeping this section of the pipeline in standby mode at all times.

[0057] Figure 2 FIG. 1 is a flow chart of a method for controlling a wet-to-dry state process of a once-through boiler according to an embodiment of the present invention. Figure 2 As shown, the embodiment of the present invention provides a method for controlling a wet-to-dry state transition process of a once-through boiler, including:

[0058] Step S1: If it is determined that the direct current boiler is converted from wet state to dry state and the pre-control conditions are met, and the opening of the boiler water pump outlet regulating valve is greater than the first preset regulating valve opening, then open the 361 regulating valve for manual control and the boiler water pump outlet regulating valve for automatic control, and periodically obtain the preset batch water reduction flow rate to realize the automatic closing of the boiler water pump outlet regulating valve until the opening of the boiler water pump outlet regulating valve is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve is no longer automatically closed within the first preset time length.

[0059] Step S2: If it is determined that the opening of the 361 regulating valve is greater than the third preset regulating valve opening, the boiler water pump outlet regulating valve is turned on for manual control and the 361 regulating valve is turned on for automatic control, and the preset batch water reduction flow is periodically obtained to realize automatic closing of the 361 regulating valve until the opening of the 361 regulating valve is less than the fourth preset regulating valve opening and the 361 regulating valve is no longer automatically closed within the second preset time length.

[0060] Step S3: Control the superheat degree at the outlet of the steam-water separator to be a first preset temperature, thereby completing the process of converting the wet state of the once-through boiler to the dry state.

[0061] In the above step S1, if the device determines that the transition from the wet state of the direct current boiler to the dry state satisfies the pre-control conditions, and the opening of the boiler water pump outlet regulating valve is greater than the first preset regulating valve opening, then the regulating valve 361 is opened for manual control and the boiler water pump outlet regulating valve is opened for automatic control, and the preset batch water reduction flow is periodically obtained to realize the automatic closing of the boiler water pump outlet regulating valve until the opening of the boiler water pump outlet regulating valve is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve no longer automatically closes within the first preset time. The device can be a computer device that executes the method. The acquisition, storage, use, and processing of data in the technical solution of this application comply with relevant regulations. The first preset regulating valve opening can be set independently according to actual conditions and can be selected as 5%. The second preset regulating valve opening can be set independently according to actual conditions and can be selected as 1%.

[0062] The first preset duration can be set independently according to actual conditions and can be selected as 5 seconds.

[0063] In step S2, if the device determines that the valve opening of 361 is greater than the third preset valve opening, the device then switches the boiler water pump outlet valve to manual control and valve 361 to automatic control. The device periodically obtains the preset batch water reduction flow rate, automatically closing valve 361 until the valve opening of 361 is less than the fourth preset valve opening and the valve no longer automatically closes within the second preset time period. The third preset valve opening can be set based on actual conditions and may be 5%. The fourth preset valve opening can be set based on actual conditions and may be 1%.

[0064] The second preset duration can be set independently according to actual conditions and can be selected as 5 seconds.

[0065] In step S3, the device controls the superheat degree at the outlet of the steam-water separator to be a first preset temperature, thereby completing the wet-to-dry state transition of the once-through boiler. The first preset temperature can be set independently according to actual conditions and can be selected as 7°C.

[0066] Determine whether the wet-to-dry state transition of a once-through boiler meets the pre-control conditions, including:

[0067] The load is determined to be the wet state maximum load; the wet state maximum load refers to the feedwater flow rate in the wet state being greater than the sum of the Bensen flow rate and the margin, and the sum of the boiler water pump outlet regulating valve opening and the 361 regulating valve opening being less than the fifth preset regulating valve opening. The wet state maximum load can represent the transition state operating condition. The load refers to the unit's generating load. In the wet state, the unit's generating load can increase to the preset transition state load. The preset transition state load can be set based on actual conditions. For a 530MW unit, for example, the preset transition state load can be set to 150MW.

[0068] Bunsen flow rate: refers to the minimum safe flow rate to ensure good cooling of the water-cooled wall when the once-through boiler is running dry.

[0069] The margin can be set independently according to actual conditions and can be selected as 150t / h.

[0070] The fifth preset valve opening can be set independently according to actual conditions and can be selected as 15%.

[0071] Start the transition timing, switch the main steam pressure at the steam-water separator outlet to constant pressure control, control the main steam pressure to be greater than the first preset pressure, and keep the load stable for the second preset time.

[0072] The main differences between constant pressure control and sliding pressure control lie in their working principles, advantages and disadvantages, and applicable scenarios.

[0073] For working principle:

[0074] Constant pressure control: In constant pressure control mode, the boiler's coal feed automatically adjusts the main steam pressure to the set value. When the main steam pressure is lower than the set value, the boiler's coal feed automatically increases, increasing steam flow and raising pressure. When the main steam pressure is higher than the set value, the boiler's coal feed automatically decreases, reducing steam flow and lowering pressure.

[0075] Sliding pressure control: Under sliding pressure control mode, the boiler coal feed will automatically adjust the main steam pressure, but the main steam pressure changes with the unit load.

[0076] Regarding the pros and cons:

[0077] For the transition process given by the present invention, since the load remains unchanged, the pressure of the corresponding sliding pressure curve also remains unchanged. The effects of constant pressure control and sliding pressure control are both that the main steam pressure is a constant value. Therefore, directly selecting the constant pressure mode is a preferred option.

[0078] For applicable scenarios:

[0079] Constant pressure control: Applicable to situations where load changes are small, or where stable turbine output needs to be ensured.

[0080] Sliding pressure control: Applicable to situations with large load changes or when the turbine operation stability and efficiency need to be improved.

[0081] The first preset pressure can be set independently according to actual conditions and can be selected as 10MPa.

[0082] The second preset duration can be set independently according to actual conditions and can be selected as 5 minutes.

[0083] The periodic acquisition of the preset batch water reduction flow rate includes:

[0084] Determine the preset total water reduction flow rate that needs to be reduced when the direct current boiler is converted from wet state to dry state, and determine the preset batch water reduction flow rate to be reduced in batches based on the preset total water reduction flow rate; the superheat value for conversion to dry state can be set (for example: 10°C), and then the preset total water reduction flow rate ΔW that needs to be reduced in the process of converting from wet state to dry state is given based on actual tests or theoretical methods. The preset total water reduction flow rate should not be lower than the minimum feed water flow rate required by the boiler main protection.

[0085] Importing the preset batch water reduction flow rate in batches one by one according to the preset time period until all the preset total water reduction flow rates are imported.

[0086] The following are instructions for periodically obtaining the preset batch water reduction flow rate to achieve automatic closing of the boiler water pump outlet regulating valve:

[0087] Open the 361 regulating valve for manual control and the boiler water pump outlet regulating valve for automatic control to control the water level in the water storage tank and start reducing water. Reduce the water flow by (1 / N)×ΔW every 20 seconds, and complete the whole water reduction process in N×20 seconds. During this period, wait for the boiler water pump outlet regulating valve to automatically close until the opening of the boiler water pump outlet regulating valve is less than 1% and it is no longer closed within 5 seconds.

[0088] The following are instructions for periodically obtaining the preset batch water reduction flow rate by automatically closing the 361 regulating valve:

[0089] Open the boiler water pump outlet regulating valve for manual control and the 361 regulating valve for automatic control to control the water level in the water storage tank and start reducing water. Reduce the water flow by (1 / N)×ΔW every 20 seconds, and complete the whole process of water reduction in N×20 seconds. During this period, wait for the 361 regulating valve to automatically close until the opening of the 361 regulating valve is less than 1% and it does not close again within 5 seconds.

[0090] The once-through boiler wet-to-dry state process control method further includes:

[0091] When the third preset time is reached after the wet-to-dry state transition of the direct current boiler is completed, the 361 regulating valve and the electric valve behind the regulating valve are closed, the electric shut-off valve at the boiler water pump outlet is closed, the boiler water pump warm-up valve and the start-up system warm-up valve are opened, and the steam-water separator outlet superheat temperature is switched to automatic control. The third preset time can be set according to actual conditions and can be selected as 3 minutes. Figure 1 As shown, closing the 361 regulating valve and the electric valve behind the regulating valve means closing the No. 1 361 regulating valve and the electric valve behind the 1 361 regulating valve, as well as the No. 2 361 regulating valve and the electric valve behind the 2 361 regulating valve. This step can complete the state transition operation.

[0092] The wet-to-dry state process control method for a once-through boiler provided in an embodiment of the present invention is further described as follows:

[0093] 1. Increase the unit's generating load to x1MW in the wet state. The grid should not change the generating load during the transition. Start the transition timing. The transition operating condition is characterized by the sum of the boiler water pump outlet regulating valve opening and the 361 regulating valve opening being less than x2, and the feedwater flow rate da before the transition being ≥ the native flow rate + margin 1.

[0094] For example, the typical values ​​of a 530MW unit are: the unit's power generation load is 150MW, the boiler water pump outlet regulating valve opening + 361 regulating valve opening ≤ 15%, and the margin 1 = 150t / h.

[0095] 2. Design the superheat value for conversion to dry state (for example: 10℃), and then give the water feed flow rate ΔW that needs to be reduced during the wet-to-dry state conversion process based on actual tests or theoretical methods. It should be noted that the water feed flow rate after the wet-to-dry state conversion should not be lower than the minimum water feed flow rate required by the boiler main protection.

[0096] 3. Confirm that the main steam pressure is switched to constant pressure mode and that the main steam pressure is higher than x3MPa (for example: 10MPa, refer to the design value).

[0097] 4. The unit's power generation load is stable for x4 minutes (for example: 5 minutes) and is ready for transition.

[0098] 5. Reduce water flow and reduce boiler water pump outlet control valve opening: If the boiler water pump outlet control valve opening is greater than x5 (e.g., 5%), prioritize reducing the boiler water pump outlet flow. The specific method is: valve 361 is manually activated, and the boiler water pump outlet control valve is automatically activated to control the water level in the water storage tank. Begin reducing water flow by reducing the feedwater flow by (1 / N) × ΔW every x6 seconds, for N × x6 seconds (e.g., x6 = 20, N = 5). During this time, wait for the boiler water pump outlet control valve to automatically close until the boiler water pump outlet control valve opening is less than x7 and does not close again within x8 seconds (e.g., x7 = 1%, x8 = 5).

[0099] 6. Reduce water and close the opening of valve 361: If the opening of valve 361 is greater than 5%, then reduce water and close the opening of valve 361. The specific method is: the boiler water pump outlet regulating valve is turned to manual, valve 361 is turned to automatic, and water is continued to be reduced, and valve 361 is closed until the opening of valve 361 is less than x9 and x 10 Seconds (Example: x9=1%, x 10 =5) No longer close the inner.

[0100] 7. When superheat > x 11 ℃ (for example: 7℃), the transition is completed.

[0101] Transition completed x 12 After 3 minutes (for example, 3 minutes), close the electric valves before and after valve 361, close the electric valve at the boiler water pump outlet, open the boiler water pump warm-up valve, open the start-up system warm-up valve, and switch the steam-water separator outlet superheat temperature to automatic control. The transition operation is complete. The opening degree of the boiler water pump warm-up valve and the start-up system warm-up valve can be adjusted according to actual conditions.

[0102] The embodiment of the present invention provides a direct current boiler wet state to dry state process control method. If it is determined that the direct current boiler wet state to dry state meets the pre-control conditions and the boiler water pump outlet regulating valve opening is greater than the first preset regulating valve opening, then the regulating valve 361 is turned on for manual control and the boiler water pump outlet regulating valve is turned on for automatic control, and the preset batch water reduction flow is periodically obtained to realize the automatic closing of the boiler water pump outlet regulating valve until the boiler water pump outlet regulating valve opening is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve is no longer automatically closed within the first preset time length; if it is determined that the regulating valve opening 361 If the opening of the boiler water pump is greater than the third preset valve opening, the boiler water pump outlet valve is opened for manual control and the 361 valve is opened for automatic control, and the preset batch water reduction flow is periodically obtained to realize the automatic closing of the 361 valve until the opening of the 361 valve is less than the fourth preset valve opening and the 361 valve is no longer automatically closed within the second preset time; the superheat degree at the outlet of the steam-water separator is controlled to be the first preset temperature, and the process of the direct current boiler transitioning from the wet state to the dry state is completed, which can ensure that the transition process of the direct current boiler from the wet state to the dry state proceeds smoothly and reduces the time delay during the transition process.

[0103] Furthermore, it is determined that the wet-to-dry state transition of the once-through boiler meets the pre-control conditions, including:

[0104] Determine that the load is the maximum load in the wet state; the feed water flow in the wet state of the maximum load is greater than the sum of the Bensen flow and the margin, and the sum of the boiler water pump outlet regulating valve opening and the 361 regulating valve opening is less than the fifth preset regulating valve opening; refer to the above embodiment for description and no further details will be given.

[0105] The transition timer is started, and the main steam pressure at the steam-water separator outlet is switched to constant pressure control, the main steam pressure is controlled to be greater than the first preset pressure, and the load is kept stable for a second preset time.

[0106] Furthermore, the periodic acquisition of the preset batch water reduction flow rate includes:

[0107] Determine the preset total water reduction flow required to reduce the once-through boiler from the wet state to the dry state, and determine the preset batch water reduction flow rates to be reduced in batches based on the preset total water reduction flow; refer to the above embodiment for description and no further details will be given.

[0108] The preset batch water reduction flow is imported one by one in batches according to the preset time period until the preset total water reduction flow is fully imported.

[0109] Furthermore, the once-through boiler wet-to-dry state process control method further includes:

[0110] After the wet-to-dry transition of the once-through boiler reaches a third preset time, the 361 regulating valve and the electric valve behind the regulating valve are closed, the electric shutoff valve at the boiler water pump outlet is closed, the boiler water pump warm-up valve and the start-up system warm-up valve are opened, and the steam-water separator outlet superheat temperature is switched to automatic control. This can be explained with reference to the above embodiment and will not be repeated here.

[0111] Furthermore, the 361 regulating valves are No. 1 361 regulating valve and No. 2 361 regulating valve.

[0112] Furthermore, the first preset regulating valve opening is equal to the third preset regulating valve opening, and the second preset regulating valve opening is equal to the fourth preset regulating valve opening; the above embodiment can be referred to for description and will not be repeated here.

[0113] The fifth preset regulating valve opening is greater than the first preset regulating valve opening, and the first preset regulating valve opening is greater than the second preset regulating valve opening.

[0114] Figure 3 FIG. 1 is a schematic diagram of a control device for a wet-to-dry state process of a once-through boiler according to an embodiment of the present invention. Figure 3 As shown, the wet-to-dry state process control device of a once-through boiler provided in an embodiment of the present invention includes a first control unit 301, a second control unit 302, and a third control unit 303, wherein:

[0115] The first control unit 301 is configured to, if it is determined that the transition from the wet state to the dry state of the direct-flow boiler meets the pre-control conditions and the opening of the boiler water pump outlet regulating valve is greater than the first preset regulating valve opening, activate the 361 regulating valve for manual control and the 361 regulating valve for automatic control, and periodically obtain the preset batch water reduction flow rate to automatically close the boiler water pump outlet regulating valve until the opening of the boiler water pump outlet regulating valve is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve no longer automatically closes within the first preset time period. The second control unit 302 is configured to, if it is determined that the opening of the 361 regulating valve is greater than the third preset regulating valve opening, activate the 361 regulating valve for manual control and the 361 regulating valve for automatic control, and periodically obtain the preset batch water reduction flow rate to automatically close the 361 regulating valve until the opening of the 361 regulating valve is less than the fourth preset regulating valve opening and the 361 regulating valve no longer automatically closes within the second preset time period. The third control unit 303 is configured to control the superheat degree at the steam-water separator outlet to be the first preset temperature, thereby completing the transition from the wet state to the dry state of the direct-flow boiler.

[0116] Specifically, the first control unit 301 in the device is used to open the 361 regulating valve for manual control and the boiler water pump outlet regulating valve for automatic control if it is determined that the direct current boiler is converted from wet state to dry state to meet the pre-control conditions, and the boiler water pump outlet regulating valve opening is greater than the first preset regulating valve opening, and periodically obtain the preset batch water reduction flow rate to realize the automatic closing of the boiler water pump outlet regulating valve until the boiler water pump outlet regulating valve opening is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve is no longer automatically closed within the first preset time length; the second control unit Element 302 is used to, if it is determined that the 361 regulating valve opening is greater than the third preset regulating valve opening, open the boiler water pump outlet regulating valve for manual control and the 361 regulating valve for automatic control, and periodically obtain the preset batch water reduction flow rate to realize the automatic closing of the 361 regulating valve until the 361 regulating valve opening is less than the fourth preset regulating valve opening and the 361 regulating valve is no longer automatically closed within the second preset time length; the third control unit 303 is used to control the superheat degree of the steam-water separator outlet to the first preset temperature, thereby completing the process of the direct current boiler converting from wet to dry state.

[0117] The control device for the process of converting the wet state to the dry state of a direct current boiler provided by an embodiment of the present invention, if it is determined that the direct current boiler is converted from the wet state to the dry state to meet the pre-control conditions and the opening of the boiler water pump outlet regulating valve is greater than the first preset regulating valve opening, then the regulating valve 361 is turned on for manual control and the boiler water pump outlet regulating valve is turned on for automatic control, and the preset batch water reduction flow is periodically obtained to realize the automatic closing of the boiler water pump outlet regulating valve until the opening of the boiler water pump outlet regulating valve is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve is no longer automatically closed within the first preset time length; if it is determined that the opening of the regulating valve 361 is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve is no longer automatically closed within the first preset time length; If the opening of the boiler water pump is greater than the third preset valve opening, the boiler water pump outlet valve is opened for manual control and the 361 valve is opened for automatic control, and the preset batch water reduction flow is periodically obtained to realize the automatic closing of the 361 valve until the opening of the 361 valve is less than the fourth preset valve opening and the 361 valve is no longer automatically closed within the second preset time; the superheat degree at the outlet of the steam-water separator is controlled to be the first preset temperature, and the process of the direct current boiler transitioning from the wet state to the dry state is completed, which can ensure that the transition process of the direct current boiler from the wet state to the dry state proceeds smoothly and reduces the time delay during the transition process.

[0118] Furthermore, the once-through boiler wet-to-dry state process control device is specifically used to:

[0119] Determine that the load is the wet maximum load; the wet feed water flow rate of the wet maximum load is greater than the sum of the Bunsen flow rate and the margin, and the sum of the boiler water pump outlet regulating valve opening and the 361 regulating valve opening is less than the fifth preset regulating valve opening;

[0120] Start the transition timing, switch the main steam pressure at the steam-water separator outlet to constant pressure control, control the main steam pressure to be greater than the first preset pressure, and keep the load stable for the second preset time.

[0121] Furthermore, the once-through boiler wet-to-dry state process control device is specifically used to:

[0122] Determine a preset total water reduction flow rate required to reduce the once-through boiler from a wet state to a dry state, and determine preset batch water reduction flow rates to be reduced in batches based on the preset total water reduction flow rate;

[0123] Importing the preset batch water reduction flow rate in batches one by one according to the preset time period until all the preset total water reduction flow rates are imported.

[0124] Furthermore, the once-through boiler wet-to-dry state process control device is also used for:

[0125] When the third preset time is reached after the direct current boiler wet-to-dry state process is completed, close the 361 regulating valve and the electric valve behind the regulating valve, close the electric shut-off valve at the boiler water pump outlet, open the boiler water pump warm-up valve and the start-up system warm-up pipe valve, and switch the steam-water separator outlet superheat temperature to automatic control.

[0126] Furthermore, the 361 regulating valves are No. 1 361 regulating valve and No. 2 361 regulating valve.

[0127] Furthermore, the first preset regulating valve opening is equal to the third preset regulating valve opening, and the second preset regulating valve opening is equal to the fourth preset regulating valve opening;

[0128] The fifth preset regulating valve opening is greater than the first preset regulating valve opening, and the first preset regulating valve opening is greater than the second preset regulating valve opening.

[0129] The embodiment of the present invention provides an embodiment of a direct current boiler wet-to-dry state process control device, which can be specifically used to execute the processing flow of the above-mentioned method embodiments. Its functions are not repeated here, and reference can be made to the detailed description of the above-mentioned method embodiments.

[0130] Figure 4 A schematic diagram of the physical structure of a computer device provided in an embodiment of the present invention is shown in FIG. Figure 4 As shown, the computer device includes: a memory 401, a processor 402, and a computer program stored in the memory 401 and executable on the processor 402. When the processor 402 executes the computer program, the following method is implemented:

[0131] If it is determined that the transition from the wet state to the dry state of the once-through boiler meets the pre-control conditions, and the opening of the boiler water pump outlet regulating valve is greater than the first preset regulating valve opening, the regulating valve 361 is turned on for manual control and the boiler water pump outlet regulating valve is turned on for automatic control, and the preset batch water reduction flow is periodically obtained to realize automatic closing of the boiler water pump outlet regulating valve until the opening of the boiler water pump outlet regulating valve is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve is no longer automatically closed within the first preset time;

[0132] If it is determined that the opening of the 361 regulating valve is greater than the third preset regulating valve opening, the boiler water pump outlet regulating valve is turned on for manual control and the 361 regulating valve is turned on for automatic control, and the preset batch water reduction flow rate is periodically obtained to realize automatic closing of the 361 regulating valve until the opening of the 361 regulating valve is less than the fourth preset regulating valve opening and the 361 regulating valve is no longer automatically closed within the second preset time period;

[0133] By controlling the superheat degree at the outlet of the steam-water separator to be the first preset temperature, the process of converting the wet state of the once-through boiler to the dry state is completed.

[0134] This embodiment discloses a computer program product, which includes a computer program. When the computer program is executed by a processor, the following method is implemented:

[0135] If it is determined that the transition from the wet state to the dry state of the once-through boiler meets the pre-control conditions, and the opening of the boiler water pump outlet regulating valve is greater than the first preset regulating valve opening, the regulating valve 361 is turned on for manual control and the boiler water pump outlet regulating valve is turned on for automatic control, and the preset batch water reduction flow is periodically obtained to realize automatic closing of the boiler water pump outlet regulating valve until the opening of the boiler water pump outlet regulating valve is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve is no longer automatically closed within the first preset time;

[0136] If it is determined that the opening of the 361 regulating valve is greater than the third preset regulating valve opening, the boiler water pump outlet regulating valve is turned on for manual control and the 361 regulating valve is turned on for automatic control, and the preset batch water reduction flow rate is periodically obtained to realize automatic closing of the 361 regulating valve until the opening of the 361 regulating valve is less than the fourth preset regulating valve opening and the 361 regulating valve is no longer automatically closed within the second preset time period;

[0137] By controlling the superheat degree at the outlet of the steam-water separator to be the first preset temperature, the process of converting the wet state of the once-through boiler to the dry state is completed.

[0138] This embodiment provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the following method is implemented:

[0139] If it is determined that the transition from the wet state to the dry state of the once-through boiler meets the pre-control conditions, and the opening of the boiler water pump outlet regulating valve is greater than the first preset regulating valve opening, the regulating valve 361 is turned on for manual control and the boiler water pump outlet regulating valve is turned on for automatic control, and the preset batch water reduction flow is periodically obtained to realize automatic closing of the boiler water pump outlet regulating valve until the opening of the boiler water pump outlet regulating valve is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve is no longer automatically closed within the first preset time;

[0140] If it is determined that the opening of the 361 regulating valve is greater than the third preset regulating valve opening, the boiler water pump outlet regulating valve is turned on for manual control and the 361 regulating valve is turned on for automatic control, and the preset batch water reduction flow rate is periodically obtained to realize automatic closing of the 361 regulating valve until the opening of the 361 regulating valve is less than the fourth preset regulating valve opening and the 361 regulating valve is no longer automatically closed within the second preset time period;

[0141] By controlling the superheat degree at the outlet of the steam-water separator to be the first preset temperature, the process of converting the wet state of the once-through boiler to the dry state is completed.

[0142] Compared with the technical solutions in the prior art, the embodiment of the present invention provides a method for controlling the process of a once-through boiler transitioning from a wet state to a dry state. If it is determined that the transition from a wet state to a dry state of the once-through boiler satisfies a pre-control condition and the opening of the boiler water pump outlet regulating valve is greater than a first preset regulating valve opening, the regulating valve 361 is opened for manual control and the boiler water pump outlet regulating valve is opened for automatic control, and the preset batch water reduction flow rate is periodically obtained to automatically close the boiler water pump outlet regulating valve until the opening of the boiler water pump outlet regulating valve is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve no longer automatically closes within a first preset time period. If it is determined that the 361 regulating valve opening is greater than the third preset regulating valve opening, the boiler water pump outlet regulating valve is opened for manual control and the 361 regulating valve is opened for automatic control, and the preset batch water reduction flow is periodically obtained to realize the automatic closing of the 361 regulating valve until the 361 regulating valve opening is less than the fourth preset regulating valve opening and the 361 regulating valve is no longer automatically closed within the second preset time; the superheat degree at the steam-water separator outlet is controlled to be the first preset temperature, and the process of the direct current boiler transitioning from the wet state to the dry state is completed, which can ensure that the transition process of the direct current boiler from the wet state to the dry state proceeds smoothly and reduce the time delay during the transition process.

[0143] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0144] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0145] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0146] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0147] Throughout this specification, reference to terms such as "one embodiment," "a specific embodiment," "some embodiments," "for example," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0148] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A control method for a wet-to-dry state process of a once-through boiler, characterized in that: include: If it is determined that the transition from the wet state to the dry state of the once-through boiler meets the pre-control conditions, and the opening of the boiler water pump outlet regulating valve is greater than the first preset regulating valve opening, the regulating valve 361 is turned on for manual control and the boiler water pump outlet regulating valve is turned on for automatic control, and the preset batch water reduction flow is periodically obtained to realize automatic closing of the boiler water pump outlet regulating valve until the opening of the boiler water pump outlet regulating valve is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve is no longer automatically closed within the first preset time; If it is determined that the opening of the 361 regulating valve is greater than the third preset regulating valve opening, the boiler water pump outlet regulating valve is turned on for manual control and the 361 regulating valve is turned on for automatic control, and the preset batch water reduction flow rate is periodically obtained to realize automatic closing of the 361 regulating valve until the opening of the 361 regulating valve is less than the fourth preset regulating valve opening and the 361 regulating valve is no longer automatically closed within the second preset time period; By controlling the superheat degree at the outlet of the steam-water separator to be the first preset temperature, the process of converting the wet state of the once-through boiler to the dry state is completed.

2. The wet-to-dry state process control method for a once-through boiler according to claim 1, characterized in that: Determine whether the wet-to-dry state transition of a once-through boiler meets the pre-control conditions, including: Determine that the load is the wet maximum load; the wet feed water flow rate of the wet maximum load is greater than the sum of the Bunsen flow rate and the margin, and the sum of the boiler water pump outlet regulating valve opening and the 361 regulating valve opening is less than the fifth preset regulating valve opening; Start the transition timing, switch the main steam pressure at the steam-water separator outlet to constant pressure control, control the main steam pressure to be greater than the first preset pressure, and keep the load stable for the second preset time.

3. The wet-to-dry state process control method for a once-through boiler according to claim 1, characterized in that: The periodic acquisition of the preset batch water reduction flow rate includes: Determine a preset total water reduction flow rate required to reduce the once-through boiler from a wet state to a dry state, and determine preset batch water reduction flow rates to be reduced in batches based on the preset total water reduction flow rate; Importing the preset batch water reduction flow rate in batches one by one according to the preset time period until all the preset total water reduction flow rates are imported.

4. The wet-to-dry state process control method for a once-through boiler according to claim 1, characterized in that: The once-through boiler wet-to-dry state process control method further includes: When the third preset time is reached after the direct current boiler wet-to-dry state process is completed, close the 361 regulating valve and the electric valve behind the regulating valve, close the electric shut-off valve at the boiler water pump outlet, open the boiler water pump warm-up valve and the start-up system warm-up pipe valve, and switch the steam-water separator outlet superheat temperature to automatic control.

5. The wet-to-dry state process control method for a once-through boiler according to claim 1, characterized in that: The 361 regulating valves are No. 1 361 regulating valve and No. 2 361 regulating valve.

6. The wet-to-dry state process control method for a once-through boiler according to claim 2, characterized in that: The first preset regulating valve opening is equal to the third preset regulating valve opening, and the second preset regulating valve opening is equal to the fourth preset regulating valve opening; The fifth preset regulating valve opening is greater than the first preset regulating valve opening, and the first preset regulating valve opening is greater than the second preset regulating valve opening.

7. A control device for the wet-to-dry state process of a once-through boiler, characterized in that: include: The first control unit is configured to, if it is determined that the transition from the wet state to the dry state of the once-through boiler satisfies the pre-control condition and the opening of the boiler water pump outlet regulating valve is greater than the first preset regulating valve opening, activate the regulating valve 361 for manual control and the boiler water pump outlet regulating valve for automatic control, and periodically obtain the preset batch water reduction flow rate to automatically close the boiler water pump outlet regulating valve until the opening of the boiler water pump outlet regulating valve is less than the second preset regulating valve opening and the boiler water pump outlet regulating valve is no longer automatically closed within the first preset time period; The second control unit is configured to, if it is determined that the opening of the regulating valve 361 is greater than the third preset regulating valve opening, activate the manual control of the boiler water pump outlet regulating valve and the automatic control of the regulating valve 361, and periodically obtain the preset batch water reduction flow rate to realize automatic closing of the regulating valve 361 until the opening of the regulating valve 361 is less than the fourth preset regulating valve opening and the regulating valve 361 is no longer automatically closed within the second preset time period; The third control unit is used to control the superheat degree of the steam-water separator outlet to be a first preset temperature, thereby completing the process of converting the wet state of the direct current boiler to the dry state.

8. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

10. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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