Boiler unit water supply system control method and device based on desuperheating water weighted correction

Abstract

The invention provides a boiler unit water supply system control method and device based on desuperheating water weighted correction. The method comprises the steps that according to the total flow of attemperation water, the measured flow weight coefficient of boiler attemperation water, the valve opening degree of each stage of attemperation water, the valve opening degree correction coefficient and the converted flow weight coefficient of the boiler attemperation water, weighted stacking processing is conducted on the flow of the attemperation water and the valve opening degree, and a weighted stacking processing result is obtained; correcting the main feed water flow coefficient, the weighted stacking processing result and the adjusted quantity of the PID controller of the main feed water flow measurement value of the boiler at the inlet of the economizer by using the boiler desuperheating water; and the set value of the PID controller for correcting the feed water flow is controlled according to the total coal quantity obtained from the boiler master control, the pre-selected water-coal ratio polygonal function and the intermediate point temperature. The problem that the measurement accuracy of the flow of the attemperation water is insufficient is solved, the problem that when the attemperation water is greatly adjusted and changed, control over the temperature of the intermediate point is easily affected is solved, and the control quality of water supply over the intermediate point is improved.

Description

Technical Field

[0001] The present application relates to a boiler unit feed water system control method, and in particular to a boiler unit feed water system control method and device based on desuperheated water weighted correction. Background Art

[0002] With the advancement of the construction of new power systems, coal-fired power has gradually transformed into a basic guarantee type and a system regulation type power source. Deep peak load regulation and wide load regulation have become increasingly normalized, which has put forward higher requirements for the operation regulation and parameter control of thermal power units. At present, DC furnace supercritical units have become the main coal-fired units. For DC furnace units, the control of the water supply system directly affects the control effect of the main steam temperature and main steam pressure, and is the core of the entire coordinated control.

[0003] When the supercritical (ultra) direct current furnace coal-fired unit is operating in wet state, saturated steam and saturated water coexist in the steam-water separator, and the water supply system controls the water level of the steam-water separator. At this time, the main steam temperature is mainly controlled by adjusting the amount of fuel and the radiation changes in the furnace; when the unit enters dry operation, the boiler enters the direct current state, and the feed water passes through the economizer, water-cooled wall and other heating surfaces at one time, and the steam-water separator is all superheated steam.

[0004] For dry-running DC boiler units, feed water and fuel jointly control steam temperature (i.e., the separator outlet temperature is controlled by controlling the water-coal ratio). If the water-coal ratio remains stable, the separator outlet temperature (i.e., the midpoint temperature) is basically constant. Conversely, a large change in the water-coal ratio will cause fluctuations in the separator outlet temperature, thereby affecting the main steam temperature. However, considering the load changes, coal volume changes, and various factors in actual operation, the stability of the water-coal ratio cannot be guaranteed. Therefore, the water-coal ratio is only used as a rough adjustment method for steam temperature, and the precise adjustment of steam temperature is achieved by spraying superheated steam cooling water.

[0005] In order to consider the system economy and reduce heat exchange losses, in recent years, newly built thermal power units generally adopt the method of extracting cooling water from the economizer inlet to minimize the heat exchange losses of cooling water spraying. The measurement point of the boiler main feed water flow is generally arranged on the feed water platform. Therefore, the increase or decrease of the cooling water spray flow will cause the feed water flow entering the steam-water separator to decrease or increase, and then cause the steam-water separator outlet temperature to increase or decrease. When the cooling water spray adjustment range is small, the closed-loop control system can generally achieve automatic balance, but when the adjustment range is large, it is easy to cause the separator outlet temperature and the main steam temperature regulation cycle to deteriorate.

[0006] Therefore, how to consider the influence of cooling water spray in feed water control is of great significance for improving the control effect of direct current boiler units on the separator outlet temperature and the main steam temperature. Summary of the invention

[0007] In response to the problems in the prior art, the present application provides a boiler unit feed water system control method and device based on weighted correction of cooling water, so as to solve the problem of insufficient measurement accuracy of cooling water flow rate and the problem that the control of the mid-point temperature is easily affected when the cooling water is adjusted significantly.

[0008] In order to solve the above technical problems, this application provides the following technical solutions:

[0009] In a first aspect, the present application provides a boiler unit feed water system control method based on desuperheated water weighted correction, comprising:

[0010] According to the total desuperheating water flow, the boiler desuperheating water measured flow weight coefficient, the desuperheating water regulating valve openings at all levels, the regulating valve opening correction coefficient and the boiler desuperheating water converted flow weight coefficient, the desuperheating water flow and the regulating valve opening are weighted superposition processed to obtain the weighted superposition processing result;

[0011] The PID controller controlled variable is to correct the main feed water flow coefficient using the boiler desuperheating water, the weighted superposition processing result and the measured value of the main feed water flow of the boiler at the economizer inlet;

[0012] The set value of the PID controller that corrects the feed water flow is controlled based on the total coal amount obtained from the boiler main control, the pre-selected water-coal ratio broken line function and the midpoint temperature, so that the PID controller performs closed-loop regulation on the deviation between the controlled variable and the set value.

[0013] In one embodiment, a weighted superposition processing of the desuperheating water flow rate and the regulating valve opening is performed according to the total desuperheating water flow rate, the boiler desuperheating water measured flow rate weight coefficient, the desuperheating water regulating valve openings at each level, the regulating valve opening correction coefficient, and the boiler desuperheating water converted flow rate weight coefficient, and a weighted superposition processing result is obtained, including:

[0014] The total flow rate of desuperheating water and the weight coefficient of the measured flow rate of boiler desuperheating water are used to obtain the total flow rate correction value of desuperheating water;

[0015] Generate a boiler cooling water converted flow correction value based on the opening of each level of cooling water regulating valve, the corresponding regulating valve opening correction coefficient and the boiler cooling water converted flow weight coefficient;

[0016] The total desuperheating water flow correction value and the boiler desuperheating water converted flow correction value are added together to obtain a weighted superposition processing result of the desuperheating water regulating valve opening and the desuperheating water flow rate.

[0017] In one embodiment, the boiler desuperheating water converted flow correction value is generated based on the desuperheating water regulating valve openings of each level, the regulating valve opening correction coefficient corresponding to the openings, and the boiler desuperheating water converted flow weight coefficient, including:

[0018] The total opening correction value is obtained based on the opening of each level of the desuperheating water regulating valve and the corresponding regulating valve opening correction coefficient.

[0019] The boiler desuperheating water converted flow rate correction value is obtained according to the boiler desuperheating water converted flow rate weight coefficient and the total opening correction value.

[0020] In one embodiment, the opening correction value generated based on the opening of each level of desuperheating water regulating valve and the corresponding regulating valve opening correction coefficient to obtain the total opening correction value includes:

[0021] Obtain the opening of each level of desuperheating water regulating valve and the corresponding regulating valve opening correction coefficient;

[0022] The openings of the desuperheating water regulating valves at each level are multiplied by the corresponding regulating valve opening correction coefficients to obtain the opening correction values ​​at each level;

[0023] The opening correction values ​​of each level are added together to obtain the total opening correction value.

[0024] In one embodiment, the controlled variable of the PID controller using the boiler desuperheating water to correct the main feed water flow coefficient, the weighted superposition processing result and the measured value of the main feed water flow of the boiler at the economizer inlet includes:

[0025] Based on the weighted superposition processing result and the boiler desuperheating water corrected main feed water flow coefficient, the desuperheating water flow rate is obtained;

[0026] The measured value of the main feed water flow rate of the boiler at the economizer inlet is subtracted from the desuperheating water flow rate to obtain the regulated amount.

[0027] In one embodiment, the setting value of the PID controller for controlling and correcting the feed water flow rate according to the total coal amount obtained from the boiler master control, the pre-selected water-coal ratio broken line function and the intermediate point temperature includes:

[0028] Obtain the total amount of coal from the boiler master control, and obtain a basic instruction for the feed water flow rate according to the selected water-coal ratio broken line function and the total amount of coal;

[0029] The midpoint temperature control-corrected water flow rate is superimposed on the basic instruction to obtain the set value.

[0030] In a second aspect, the present application provides a boiler unit feed water system control device based on desuperheated water weighted correction, comprising:

[0031] The weighted superposition processing unit is used to perform weighted superposition processing on the desuperheating water flow and the regulating valve opening according to the total desuperheating water flow, the boiler desuperheating water measured flow weight coefficient, the desuperheating water regulating valve openings at various levels, the regulating valve opening correction coefficient and the boiler desuperheating water converted flow weight coefficient to obtain the weighted superposition processing result;

[0032] A controlled variable generating unit, used for modifying the controlled variable of the PID controller of the main feed water flow coefficient using the boiler desuperheating water, the weighted superposition processing result and the measured value of the main feed water flow of the boiler at the economizer inlet;

[0033] A set value generating unit is used to obtain the set value of the PID controller that corrects the feed water flow rate according to the total coal amount obtained from the boiler main control, the pre-selected water-coal ratio broken line function and the intermediate point temperature control, so that the PID controller can perform closed-loop regulation on the deviation between the controlled variable and the set value.

[0034] In one embodiment, the weighted overlay processing unit includes:

[0035] A cooling water total flow correction value generation module is used to obtain a cooling water total flow correction value by using the cooling water total flow and the boiler cooling water measured flow weight coefficient;

[0036] A converted flow correction value generation module is used to generate a boiler desuperheating water converted flow correction value based on the openings of desuperheating water regulating valves at various levels, the corresponding regulating valve opening correction coefficients, and the boiler desuperheating water converted flow weight coefficients;

[0037] The processing result generating module is used to perform sum operation on the total flow correction value of the desuperheating water and the converted flow correction value of the boiler desuperheating water to obtain a weighted superposition processing result of the desuperheating water regulating valve opening and the desuperheating water flow.

[0038] In one embodiment, the converted flow correction value generation module includes:

[0039] A total opening correction value generation submodule is used to generate an opening correction value based on the opening of each level of desuperheating water regulating valve and the corresponding regulating valve opening correction coefficient to obtain a total opening correction value;

[0040] The boiler desuperheating water converted flow correction value generating submodule is used to obtain the boiler desuperheating water converted flow correction value according to the boiler desuperheating water converted flow weight coefficient and the total opening correction value.

[0041] In one embodiment, the total opening correction value generating submodule includes:

[0042] The valve opening correction coefficient generation submodule is used to obtain the opening of each level of desuperheating water valve and the corresponding valve opening correction coefficient;

[0043] The opening correction value generating submodule for each level is used to multiply the opening of each level of the desuperheating water regulating valve by the corresponding regulating valve opening correction coefficient to obtain the opening correction value of each level;

[0044] The total opening correction value generating submodule is used to add the opening correction values ​​of each level to obtain the total opening correction value.

[0045] In one embodiment, the controlled variable generation unit includes:

[0046] A desuperheating water flow generation module, used to obtain the desuperheating water flow based on the weighted superposition processing result and the boiler desuperheating water corrected main feed water flow coefficient;

[0047] The controlled variable generation module is used to subtract the measured value of the main feed water flow rate of the boiler at the economizer inlet from the desuperheating water flow rate to obtain the controlled variable.

[0048] In one embodiment, the setting value generating unit includes:

[0049] A basic instruction generation module is used to obtain the total amount of coal from the boiler master control, and obtain a basic instruction for the feed water flow rate according to the selected water-coal ratio broken line function and the total amount of coal;

[0050] The set value generation module is used to superimpose the intermediate point temperature control corrected water supply flow rate with the basic instruction to obtain the set value.

[0051] In a third aspect, the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned boiler unit feed water system control method when executing the program.

[0052] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-mentioned boiler unit feed water system control method.

[0053] In a fifth aspect, the present application provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of the above-mentioned boiler unit feed water system control method.

[0054] This application solves the problem that when the desuperheating water is greatly adjusted, it is easy to cause a large disturbance in the intermediate point temperature, reduces the adjustment disturbance of the entire steam-water system, and realizes the stable control of the intermediate point temperature and the main steam temperature. The whole process is automatically realized through DCS logic, which reduces the operation of the operator and achieves a better control effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0056] Figure 1A flow chart of a boiler unit feed water system control method based on desuperheated water weighted correction provided in an embodiment of this specification;

[0057] Figure 2A This is a schematic diagram of a water supply system for a DC furnace coal-fired unit provided by an embodiment of this specification;

[0058] Figure 2B It is a logic diagram of the correction of the control of the feed water flow rate by cooling water provided by an embodiment of the present specification;

[0059] Figure 3 This is a flow chart of a boiler unit feed water system control method based on weighted correction of desuperheated water according to an embodiment of this specification;

[0060] Figure 4 This is a flow chart of a boiler unit feed water system control method based on weighted correction of desuperheated water according to an embodiment of this specification;

[0061] Figure 5 This is a flow chart of a boiler unit feed water system control method based on weighted correction of desuperheated water according to an embodiment of this specification;

[0062] Figure 6 This is a flow chart of a boiler unit feed water system control method based on weighted correction of desuperheated water according to an embodiment of this specification;

[0063] Figure 7 This is a flow chart of a boiler unit feed water system control method based on weighted correction of desuperheated water according to an embodiment of this specification;

[0064] Figure 8 is a schematic diagram of the structure of an electronic device provided by an embodiment of this specification;

[0065] Fig. 9 This is a schematic diagram of a boiler unit feed water system control device based on weighted correction of desuperheated water according to an embodiment of this specification. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0067] It should be noted that the user-related information and data involved in the embodiments of this specification are all information and data authorized by the user or fully authorized by relevant parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of the relevant data comply with relevant laws, regulations and standards, take necessary confidentiality measures, do not violate public order and good morals, and provide corresponding operation entrances for users or relevant parties to choose to authorize or refuse.

[0068] It should also be noted that in the embodiments of this specification, certain software, components, models and other existing solutions in the industry may be mentioned. They should be regarded as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of this application, but it does not mean that the applicant has or will necessarily use the solution.

[0069] like Figure 1 As shown, the embodiment of this specification provides a boiler unit feed water system control method based on desuperheated water weighted correction. Among them, the method is specifically applied to the server side. When implemented specifically, the method may include the following contents:

[0070] S101: performing weighted superposition processing on the desuperheating water flow rate and the regulating valve opening according to the total desuperheating water flow rate, the boiler desuperheating water measured flow rate weight coefficient, the desuperheating water regulating valve openings at each level, the regulating valve opening correction coefficient and the boiler desuperheating water converted flow rate weight coefficient to obtain a weighted superposition processing result;

[0071] S102: using boiler desuperheated water to correct the main feed water flow coefficient, the weighted superposition processing result and the main feed water flow measurement value of the boiler at the economizer inlet to adjust the PID controller;

[0072] S103: The set value of the PID controller for correcting the feed water flow is controlled based on the total coal quantity obtained from the boiler master control, the pre-selected water-coal ratio broken line function and the intermediate point temperature, so that the PID controller performs closed-loop regulation on the deviation between the controlled variable and the set value.

[0073] like Figure 1In the process shown, the present application performs weighted superposition processing of the cooling water flow and the regulating valve opening according to the total cooling water flow, the boiler cooling water measured flow weight coefficient, the cooling water regulating valve opening of each level, the regulating valve opening correction coefficient and the boiler cooling water converted flow weight coefficient to obtain the weighted superposition processing result; uses the boiler cooling water to correct the main feed water flow coefficient, the weighted superposition processing result and the measured value of the main feed water flow of the boiler at the economizer inlet to control the set value of the PID controller for correcting the feed water flow according to the total coal amount obtained from the boiler main control, the pre-selected water-coal ratio broken line function and the midpoint temperature, so that the PID controller performs closed-loop regulation on the deviation between the controlled amount and the set value. The boiler unit feed water system control method solves the problem of insufficient measurement accuracy of the cooling water flow and the problem that the control of the midpoint temperature is easily affected when the cooling water is adjusted greatly, thereby improving the control quality of the feed water to the midpoint.

[0074] The above boiler unit feed water system control method can be divided into two stages, namely, the weighted superposition stage of the desuperheating water flow rate and the regulating valve opening and the correction stage of the desuperheating water flow rate on the feed water control. The weighted superposition stage of the desuperheating water flow rate and the regulating valve opening corresponds to S101, and the correction stage of the desuperheating water flow rate on the feed water control corresponds to S102.

[0075] Figure 2A This is a schematic diagram of a water supply system for a DC furnace coal-fired unit provided by an embodiment of this specification; Figure 2B This is a schematic diagram of the correction logic of the cooling water flow control of the water supply provided by an embodiment of this specification; Figure 2A and Figure 2B Each step is explained in detail.

[0076] S101: performing weighted superposition processing on the desuperheating water flow rate and the regulating valve opening according to the total desuperheating water flow rate, the boiler desuperheating water measured flow rate weight coefficient, the desuperheating water regulating valve openings at each level, the regulating valve opening correction coefficient and the boiler desuperheating water converted flow rate weight coefficient to obtain a weighted superposition processing result;

[0077] Figure 3 This is a flow chart of a boiler unit feed water system control method based on weighted correction of desuperheated water according to an embodiment of this specification, as shown in FIG. Figure 3 As shown, in specific implementation, the desuperheating water flow and the regulating valve opening are weighted and superimposed according to the total desuperheating water flow, the boiler desuperheating water measured flow weight coefficient, the desuperheating water regulating valve opening of each level, the regulating valve opening correction coefficient and the boiler desuperheating water converted flow weight coefficient, and the weighted superposition processing result is obtained, which may include the following contents:

[0078] S301: Obtain a total desuperheating water flow correction value using the total desuperheating water flow and the boiler desuperheating water measured flow weight coefficient;

[0079] Specifically, the present application takes into account the flow characteristics of the cooling water regulating valve and the problem of inaccurate measurement that may occur in the orifice flowmeter at small flow rates, and uses a weighted correction method to process the cooling water flow rate.

[0080] In S301, the total flow rate of the cooling water is the measured cooling water flow rate, and the weight coefficient of the boiler cooling water measured flow rate is the measured flow rate correction coefficient.

[0081] When S301 is specifically implemented, the total flow rate of the desuperheating water may be multiplied by the weight coefficient of the measured flow rate of the boiler desuperheating water, and the product is used as the correction value of the total flow rate of the desuperheating water.

[0082] S302: generating a boiler desuperheating water converted flow correction value based on the desuperheating water regulating valve openings of each level, the regulating valve opening correction coefficients corresponding to the openings, and the boiler desuperheating water converted flow weight coefficients;

[0083] Figure 4 This is a flow chart of a boiler unit feed water system control method based on weighted correction of desuperheated water according to an embodiment of this specification, as shown in FIG. Figure 4 As shown, in specific implementation, the boiler desuperheating water converted flow correction value is generated based on the desuperheating water regulating valve openings of each level, the regulating valve opening correction coefficient corresponding to the openings, and the boiler desuperheating water converted flow weight coefficient, which may include the following contents:

[0084] S401: obtaining a total opening correction value based on the openings of the desuperheating water regulating valves at each level and the corresponding regulating valve opening correction coefficients;

[0085] Figure 5 This is a flow chart of a boiler unit feed water system control method based on weighted correction of desuperheated water according to an embodiment of this specification, as shown in FIG. Figure 5 As shown, in a specific implementation, the total opening correction value is obtained based on the opening of each level of the desuperheating water regulating valve and the corresponding regulating valve opening correction coefficient, which may include the following contents:

[0086] S501: Obtain the opening of each level of desuperheating water regulating valve and the corresponding regulating valve opening correction coefficient;

[0087] The cooling water can be divided into multiple levels. In this embodiment, Figure 2B As shown, the desuperheating water is divided into two levels, and the desuperheating water regulating valve opening of each level includes the first-level desuperheating water regulating valve opening (also called the first-level superheating desuperheating water regulating valve opening) and the second-level desuperheating water regulating valve opening (also called the second-level superheating desuperheating water regulating valve opening). The regulating valve opening correction coefficient corresponding to the first-level desuperheating water regulating valve opening is the desuperheating water regulating valve opening-flow conversion coefficient 1, and the regulating valve opening correction coefficient corresponding to the second-level desuperheating water regulating valve opening is the desuperheating water regulating valve opening-flow conversion coefficient 2.

[0088] S502: multiplying the opening of each level of the desuperheating water regulating valve by the corresponding regulating valve opening correction coefficient to obtain the opening correction value of each level;

[0089] In this embodiment, it is necessary to multiply the first-level cooling water regulating valve opening by the cooling water regulating valve opening-flow conversion coefficient 1 to obtain the corresponding first-level opening correction value, and multiply the second-level cooling water regulating valve opening by the cooling water regulating valve opening-flow conversion coefficient 2 to obtain the corresponding second-level opening correction value.

[0090] S503: Add up the opening correction values ​​of each level to obtain a total opening correction value.

[0091] Specifically, the primary opening correction value and the secondary opening correction value obtained in S502 are added together to obtain a total opening correction value.

[0092] S402: Obtain a boiler cooling water converted flow rate correction value according to a boiler cooling water converted flow rate weight coefficient and a total opening correction value.

[0093] In specific implementation, it is necessary to multiply the boiler cooling water converted flow weight coefficient by the total opening correction value, and the product is used as the boiler cooling water converted flow correction value.

[0094] S303: performing sum operation on the total desuperheating water flow correction value and the boiler desuperheating water converted flow correction value to obtain a weighted superposition processing result of the desuperheating water regulating valve opening and the desuperheating water flow rate.

[0095] Specifically, the weighted superposition processing result is the result obtained in the weighted superposition stage of the desuperheating water flow rate and the regulating valve opening.

[0096] S102: using boiler desuperheated water to correct the main feed water flow coefficient, the weighted superposition processing result and the main feed water flow measurement value of the boiler at the economizer inlet to adjust the PID controller;

[0097] In specific implementation, the speed control method of the water supply pump can be controlled by a PID closed loop method, wherein the set value ( Figure 2B SP) and the controlled quantity ( Figure 2B PV) is the setting and actual value of the water supply flow rate, and the output is the speed command of the water supply pump.

[0098] Figure 6 This is a flow chart of a boiler unit feed water system control method based on weighted correction of desuperheated water according to an embodiment of this specification, as shown in FIG. Figure 6 As shown, in a specific implementation, the controlled variable of the PID controller using the boiler desuperheating water to correct the main feed water flow coefficient, the weighted superposition processing result and the measured value of the main feed water flow of the boiler at the economizer inlet may include the following:

[0099] S601: Desuperheating water flow rate is obtained based on the weighted superposition processing result and the boiler desuperheating water correction main feed water flow coefficient;

[0100] In specific implementation, the weighted superposition processing result can be multiplied by the boiler desuperheating water corrected main feed water flow coefficient, and the product is used as the desuperheating water flow.

[0101] S602: Subtract the measured value of the boiler main feed water flow rate at the economizer inlet from the cooling water flow rate to obtain the regulated quantity.

[0102] In one embodiment, the desuperheating water flow obtained in S601 can also be processed by inertial filtering to obtain a more accurate result. The PID controlled variable can be obtained by subtracting the measured value of the boiler main feed water flow at the economizer inlet from the desuperheating water flow after inertial filtering.

[0103] S103: The set value of the PID controller for correcting the feed water flow is controlled based on the total coal quantity obtained from the boiler master control, the pre-selected water-coal ratio broken line function and the intermediate point temperature, so that the PID controller performs closed-loop regulation on the deviation between the controlled variable and the set value.

[0104] Figure 7 This is a flow chart of a boiler unit feed water system control method based on weighted correction of desuperheated water according to an embodiment of this specification, as shown in FIG. Figure 7 As shown, in specific implementation, the setting value of the PID controller for correcting the feed water flow rate is controlled according to the total coal amount obtained from the boiler master control, the pre-selected water-coal ratio broken line function and the intermediate point temperature, which may include the following contents:

[0105] S701: Obtain the total amount of coal from the boiler master control, and obtain a basic instruction for the feed water flow rate according to the selected water-coal ratio broken line function and the total amount of coal;

[0106] The boiler master outputs the total coal quantity instruction, which is converted into the basic instruction of the feed water flow rate through the water-coal ratio broken line function F(x). There are many existing water-coal ratio broken line functions F(x), and different water-coal ratio broken line functions F(x) can be selected according to the actual working conditions.

[0107] In one embodiment, after obtaining the above basic instructions, inertial filtering processing may be performed on the above basic instructions to obtain more accurate results.

[0108] S702: Superimpose the intermediate point temperature control corrected water flow rate with the basic instruction to obtain a set value.

[0109] The regulated variable and the set value are input into the PID controller respectively. The PID controller can control the speed of the water supply pump and realize closed-loop regulation of the deviation between the regulated variable and the set value.

[0110] Combination Figure 2A and Figure 2B This application extracts superheated desuperheating water from the economizer inlet, and synchronously changes the adjusted water supply when the desuperheating water regulation changes significantly. Through the closed-loop control of the water supply main control, the water supply flow entering the steam-water separator can be compensated in real time to ensure that the water-coal ratio at the steam-water separator position maintains a dynamic balance and achieves relative stability of the intermediate point control.

[0111] After ensuring the relative stability of the intermediate point temperature control, the present application can also narrow the regulation range of the superheated desuperheating water for the main steam temperature, reduce the desuperheating water regulation range, reduce the fluctuation of the entire steam-water system, and improve the regulation quality of the main steam temperature.

[0112] This application takes into account the problem of inaccurate measurement of the cooling water flow rate using an orifice plate, and uses the weighted addition method of the measured cooling water flow rate and the cooling water regulating valve opening to improve the reliability of the cooling water flow rate as a control parameter. At the same time, the weight coefficient corresponding to the measured cooling water flow rate and the cooling water regulating valve opening can be flexibly adjusted according to the actual situation on site.

[0113] This application can be easily configured and applied in DCS control systems of different manufacturers, has good practicality, and is easy to promote.

[0114] This specification embodiment provides an electronic device, referring to Figure 8 The electronic device includes a network communication port 801, a processor 802 and a memory 803, and the above structures are connected through internal cables so that each structure can perform specific data interaction.

[0115] Among them, the network communication port 801 can be specifically used to receive data such as the total flow of cooling water, the weight coefficient of the measured flow of boiler cooling water, the opening of cooling water regulating valves at each level, the correction coefficient of the regulating valve opening and the weight coefficient of the converted flow of boiler cooling water.

[0116] The processor 802 can be specifically used to perform weighted superposition processing of the cooling water flow and the regulating valve opening according to the total cooling water flow, the boiler cooling water measured flow weight coefficient, the cooling water regulating valve openings of each level, the regulating valve opening correction coefficient and the boiler cooling water converted flow weight coefficient to obtain a weighted superposition processing result; use the boiler cooling water to correct the main feed water flow coefficient, the weighted superposition processing result and the measured value of the boiler main feed water flow at the economizer inlet to control the PID controller's controlled variable; obtain the total coal amount obtained from the boiler main control, the pre-selected water-coal ratio broken line function and the midpoint temperature to control the corrected feed water flow setting value, so that the PID controller performs closed-loop regulation on the deviation between the controlled variable and the setting value.

[0117] The memory 803 may be specifically used to store corresponding instruction programs, target processing rules and other related data.

[0118] Based on the above method, the relevant structural performance of the server can be effectively utilized, the data processing speed of the electronic equipment can be improved, the problem of insufficient measurement accuracy of the cooling water flow rate and the problem that the control of the intermediate point temperature is easily affected when the cooling water is adjusted greatly is effectively solved, thereby improving the control quality of the water supply to the intermediate point.

[0119] In this embodiment, the network communication port 801 can be a virtual port that is bound to different communication protocols so that different data can be sent or received. For example, the network communication port can be a port responsible for web data communication, a port responsible for FTP data communication, or a port responsible for email data communication. In addition, the network communication port can also be a physical communication interface or communication chip. For example, it can be a wireless mobile network communication chip, such as GSM, CDMA, etc.; it can also be a Wifi chip; it can also be a Bluetooth chip.

[0120] In this embodiment, the processor 802 may be implemented in any appropriate manner. For example, the processor may take the form of a microprocessor or processor and a computer-readable medium storing a computer-readable program code (such as software or firmware) executable by the (micro)processor, a logic gate, a switch, an application specific integrated circuit (ASIC), a programmable logic controller, and an embedded microcontroller, etc. This specification does not limit this.

[0121] In this embodiment, the memory 803 may include multiple levels. In a digital system, anything that can store binary data can be a memory; in an integrated circuit, a circuit with a storage function but no physical form is also called a memory, such as RAM, FIFO, etc.; in a system, a storage device with a physical form is also called a memory, such as a memory stick, TF card, etc.

[0122] The embodiments of this specification also provide a computer-readable storage medium for an error pop-up window page guidance method, wherein the computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed, the following are achieved: weighted superposition processing of the cooling water flow and the regulating valve opening is performed according to the total cooling water flow, the boiler cooling water measured flow weight coefficient, the cooling water regulating valve openings at each level, the regulating valve opening correction coefficient and the boiler cooling water converted flow weight coefficient to obtain a weighted superposition processing result; the PID controller's controlled variable is corrected using the boiler cooling water's main feed water flow coefficient, the weighted superposition processing result and the measured value of the boiler main feed water flow at the economizer inlet; the set value of the PID controller that corrects the feed water flow is controlled according to the total coal amount obtained from the boiler main control, the pre-selected water-coal ratio broken line function and the intermediate point temperature, so that the PID controller performs closed-loop regulation on the deviation between the controlled variable and the set value.

[0123] In this embodiment, the storage medium includes, but is not limited to, a random access memory (RAM), a read-only memory (ROM), a cache, a hard disk (HDD), or a memory card. The memory may be used to store computer program instructions. The network communication unit may be an interface for network connection communication set in accordance with the standard specified by the communication protocol.

[0124] In this embodiment, the functions and effects specifically implemented by the program instructions stored in the computer-readable storage medium can be explained in comparison with other implementations and will not be described in detail here.

[0125] The embodiments of the present specification also provide a computer program product, which at least includes a computer program, and the computer program implements the following method steps when executed by a processor: weighted superposition processing of the cooling water flow and the regulating valve opening is performed according to the total cooling water flow, the boiler cooling water measured flow weight coefficient, the cooling water regulating valve openings of each level, the regulating valve opening correction coefficient and the boiler cooling water converted flow weight coefficient to obtain a weighted superposition processing result; the PID controller's controlled variable is corrected using the boiler cooling water main feed water flow coefficient, the weighted superposition processing result and the measured value of the boiler main feed water flow at the economizer inlet; the set value of the PID controller that corrects the feed water flow is controlled according to the total coal amount obtained from the boiler main control, the pre-selected water-coal ratio broken line function and the intermediate point temperature, so that the PID controller performs closed-loop regulation on the deviation between the controlled variable and the set value.

[0126] Based on the same inventive concept, the embodiment of the present application also provides a boiler unit feed water system control device based on weighted correction of desuperheated water, which can be used to implement the method described in the above embodiment, as described in the following embodiment. Since the principle of solving the problem by the boiler unit feed water system control device based on weighted correction of desuperheated water is similar to the boiler unit feed water system control method based on weighted correction of desuperheated water, the implementation of the boiler unit feed water system control device based on weighted correction of desuperheated water can refer to the implementation of the method based on software performance benchmark determination, and the repetitions will not be repeated. As used below, the term "unit" or "module" can be a combination of software and / or hardware that implements predetermined functions. Although the system described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived.

[0127] See also Fig. 9 As shown, the embodiment of this specification also provides a boiler unit water supply system control device based on weighted correction of desuperheated water, and the boiler unit water supply system control device includes: a weighted superposition processing unit 901, a controlled variable generation unit 902 and a set value generation unit 903.

[0128] The weighted superposition processing unit 901 is used to perform weighted superposition processing on the desuperheating water flow and the regulating valve opening according to the total desuperheating water flow, the boiler desuperheating water measured flow weight coefficient, the desuperheating water regulating valve openings at each level, the regulating valve opening correction coefficient and the boiler desuperheating water converted flow weight coefficient to obtain the weighted superposition processing result;

[0129] The controlled variable generating unit 902 is used to modify the controlled variable of the PID controller of the main feed water flow coefficient using the boiler desuperheating water, the weighted superposition processing result and the measured value of the main feed water flow of the boiler at the economizer inlet;

[0130] The set value generating unit 903 is used to obtain the set value of the PID controller that corrects the feed water flow rate according to the total coal amount obtained from the boiler master control, the pre-selected water-coal ratio broken line function and the intermediate point temperature control, so that the PID controller performs closed-loop regulation on the deviation between the controlled variable and the set value.

[0131] In one embodiment, the weighted superposition processing unit 901 includes: a cooling water total flow correction value generation module, a converted flow correction value generation module and a processing result generation module.

[0132] The desuperheating water total flow correction value generation module is used to obtain the desuperheating water total flow correction value by using the desuperheating water total flow and the boiler desuperheating water measured flow weight coefficient;

[0133] The converted flow correction value generation module is used to generate a boiler cooling water converted flow correction value based on the opening of each level of cooling water regulating valve, the corresponding regulating valve opening correction coefficient and the boiler cooling water converted flow weight coefficient;

[0134] The processing result generating module is used to perform sum operation on the total cooling water flow correction value and the boiler cooling water converted flow correction value to obtain a weighted superposition processing result of the cooling water regulating valve opening and the cooling water flow.

[0135] In one embodiment, the converted flow correction value generation module includes: a total opening correction value generation submodule and a boiler desuperheating water converted flow correction value generation submodule.

[0136] The total opening correction value generation submodule is used to generate the opening correction value based on the opening of each level of desuperheating water regulating valve and the corresponding regulating valve opening correction coefficient to obtain the total opening correction value;

[0137] The boiler desuperheating water converted flow correction value generating submodule is used to obtain the boiler desuperheating water converted flow correction value according to the boiler desuperheating water converted flow weight coefficient and the total opening correction value.

[0138] In one embodiment, the total opening correction value generating submodule includes: a valve opening correction coefficient generating submodule, each level opening correction value generating submodule and a total opening correction value generating submodule.

[0139] The valve opening correction coefficient generation submodule is used to obtain the opening of each level of desuperheating water valve and the corresponding valve opening correction coefficient;

[0140] The opening correction value generation submodule for each level is used to multiply the opening of the desuperheating water regulating valve at each level by the corresponding regulating valve opening correction coefficient to obtain the opening correction value at each level;

[0141] The total opening correction value generation submodule is used to add the opening correction values ​​of each level to obtain the total opening correction value.

[0142] In one embodiment, the regulated quantity generating unit 902 includes: a cooling water flow generating module and a regulated quantity generating module.

[0143] The desuperheating water flow generation module is used to obtain the desuperheating water flow based on the weighted superposition processing result and the boiler desuperheating water corrected main feed water flow coefficient;

[0144] The controlled variable generation module is used to subtract the measured value of the main feed water flow rate of the boiler at the economizer inlet from the desuperheating water flow rate to obtain the controlled variable.

[0145] In one embodiment, the setting value generating unit 903 includes: a basic instruction generating module and a setting value generating module.

[0146] The basic instruction generation module is used to obtain the total coal quantity from the boiler master control, and obtain the basic instruction of the feed water flow rate according to the selected water-coal ratio broken line function and the total coal quantity;

[0147] The set value generation module is used to superimpose the intermediate point temperature control corrected water flow rate with the basic instruction to obtain the set value.

[0148] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0149] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, 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 generate 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 flowchart and / or block diagram. 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.

[0150] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate 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 A function specified in one or more boxes.

[0151] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions 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.

[0152] In the description of this specification, the description with reference to the terms "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 application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0153] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A boiler unit feed water system control method based on desuperheated water weighted correction, characterized in that: include: According to the total desuperheating water flow, the boiler desuperheating water measured flow weight coefficient, the desuperheating water regulating valve openings at all levels, the regulating valve opening correction coefficient and the boiler desuperheating water converted flow weight coefficient, the desuperheating water flow and the regulating valve opening are weighted superposition processed to obtain the weighted superposition processing result; The PID controller controlled variable is to correct the main feed water flow coefficient using the boiler desuperheating water, the weighted superposition processing result and the measured value of the main feed water flow of the boiler at the economizer inlet; The set value of the PID controller that corrects the feed water flow is controlled based on the total coal amount obtained from the boiler main control, the pre-selected water-coal ratio broken line function and the midpoint temperature, so that the PID controller performs closed-loop regulation on the deviation between the controlled variable and the set value.

2. The boiler unit water supply system control method according to claim 1, characterized in that: According to the total desuperheating water flow, boiler desuperheating water measured flow weight coefficient, desuperheating water regulating valve openings at all levels, regulating valve opening correction coefficients and boiler desuperheating water converted flow weight coefficients, desuperheating water flow and regulating valve openings are weighted superposition processed to obtain weighted superposition processing results, including: The total flow rate of desuperheating water and the weight coefficient of the measured flow rate of boiler desuperheating water are used to obtain the total flow rate correction value of desuperheating water; Generate a boiler cooling water converted flow correction value based on the opening of each level of cooling water regulating valve, the corresponding regulating valve opening correction coefficient and the boiler cooling water converted flow weight coefficient; The total desuperheating water flow correction value and the boiler desuperheating water converted flow correction value are added together to obtain a weighted superposition processing result of the desuperheating water regulating valve opening and the desuperheating water flow rate.

3. The boiler unit water supply system control method according to claim 2, characterized in that: The method of generating a boiler desuperheating water converted flow correction value based on the desuperheating water regulating valve openings of each level, the regulating valve opening correction coefficient corresponding to the openings, and the boiler desuperheating water converted flow weight coefficient includes: The total opening correction value is obtained based on the opening of each level of the desuperheating water regulating valve and the corresponding regulating valve opening correction coefficient. The boiler desuperheating water converted flow rate correction value is obtained according to the boiler desuperheating water converted flow rate weight coefficient and the total opening correction value.

4. The boiler unit water supply system control method according to claim 3, characterized in that: The opening correction value generated based on the opening of each level of the desuperheating water regulating valve and the corresponding regulating valve opening correction coefficient to obtain the total opening correction value includes: Obtain the opening of each level of desuperheating water regulating valve and the corresponding regulating valve opening correction coefficient; The openings of the desuperheating water regulating valves at each level are multiplied by the corresponding regulating valve opening correction coefficients to obtain the opening correction values ​​at each level; The opening correction values ​​of each level are added together to obtain the total opening correction value.

5. The boiler unit water supply system control method according to claim 1, characterized in that: The controlled variable of the PID controller using the boiler desuperheating water to correct the main feed water flow coefficient, the weighted superposition processing result and the measured value of the main feed water flow of the boiler at the economizer inlet includes: Based on the weighted superposition processing result and the boiler desuperheating water corrected main feed water flow coefficient, the desuperheating water flow rate is obtained; The measured value of the main feed water flow rate of the boiler at the economizer inlet is subtracted from the desuperheating water flow rate to obtain the regulated amount.

6. The boiler unit water supply system control method according to claim 1, characterized in that: The setting value of the PID controller for controlling and correcting the feed water flow rate according to the total coal amount obtained from the boiler master control, the pre-selected water-coal ratio broken line function and the intermediate point temperature includes: Obtain the total amount of coal from the boiler master control, and obtain a basic instruction for the feed water flow rate according to the selected water-coal ratio broken line function and the total amount of coal; The midpoint temperature control-corrected water flow rate is superimposed on the basic instruction to obtain the set value.

7. A boiler unit feed water system control device based on desuperheated water weighted correction, characterized in that: include: The weighted superposition processing unit is used to perform weighted superposition processing on the desuperheating water flow and the regulating valve opening according to the total desuperheating water flow, the boiler desuperheating water measured flow weight coefficient, the desuperheating water regulating valve openings at various levels, the regulating valve opening correction coefficient and the boiler desuperheating water converted flow weight coefficient to obtain the weighted superposition processing result; A controlled variable generating unit, used for modifying the controlled variable of the PID controller of the main feed water flow coefficient using the boiler desuperheating water, the weighted superposition processing result and the measured value of the main feed water flow of the boiler at the economizer inlet; A set value generating unit is used to obtain the set value of the PID controller that corrects the feed water flow rate according to the total coal amount obtained from the boiler main control, the pre-selected water-coal ratio broken line function and the intermediate point temperature control, so that the PID controller can perform closed-loop regulation on the deviation between the controlled variable and the set value.

8. The boiler unit water supply system control device according to claim 7, characterized in that: The weighted superposition processing unit comprises: A cooling water total flow correction value generation module is used to obtain a cooling water total flow correction value by using the cooling water total flow and the boiler cooling water measured flow weight coefficient; A converted flow correction value generation module is used to generate a boiler desuperheating water converted flow correction value based on the openings of desuperheating water regulating valves at various levels, the corresponding regulating valve opening correction coefficients, and the boiler desuperheating water converted flow weight coefficients; The processing result generating module is used to perform sum operation on the total flow correction value of the desuperheating water and the converted flow correction value of the boiler desuperheating water to obtain a weighted superposition processing result of the desuperheating water regulating valve opening and the desuperheating water flow.

9. The boiler unit water supply system control device according to claim 8, characterized in that: The converted flow correction value generation module includes: A total opening correction value generation submodule is used to generate an opening correction value based on the opening of each level of desuperheating water regulating valve and the corresponding regulating valve opening correction coefficient to obtain a total opening correction value; The boiler desuperheating water converted flow correction value generating submodule is used to obtain the boiler desuperheating water converted flow correction value according to the boiler desuperheating water converted flow weight coefficient and the total opening correction value.

10. The boiler unit water supply system control device according to claim 9, characterized in that: The total opening correction value generation submodule includes: The valve opening correction coefficient generation submodule is used to obtain the opening of each level of desuperheating water valve and the corresponding valve opening correction coefficient; The opening correction value generating submodule for each level is used to multiply the opening of each level of the desuperheating water regulating valve by the corresponding regulating valve opening correction coefficient to obtain the opening correction value of each level; The total opening correction value generating submodule is used to add the opening correction values ​​of each level to obtain the total opening correction value.

11. The boiler unit water supply system control device according to claim 7, characterized in that: The controlled variable generating unit comprises: A desuperheating water flow generation module, used to obtain the desuperheating water flow based on the weighted superposition processing result and the boiler desuperheating water corrected main feed water flow coefficient; The controlled variable generation module is used to subtract the measured value of the main feed water flow rate of the boiler at the economizer inlet from the desuperheating water flow rate to obtain the controlled variable.

12. The boiler unit water supply system control device according to claim 7, characterized in that: The setting value generating unit comprises: A basic instruction generation module is used to obtain the total amount of coal from the boiler master control, and obtain a basic instruction for the feed water flow rate according to the selected water-coal ratio broken line function and the total amount of coal; The set value generation module is used to superimpose the intermediate point temperature control corrected water supply flow rate with the basic instruction to obtain the set value.

13. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the boiler unit feed water system control method according to any one of claims 1 to 6 are implemented.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the boiler unit feed water system control method according to any one of claims 1 to 6 are implemented.

15. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the boiler unit feed water system control method described in any one of claims 1 to 6 are implemented.

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