CN117707032A - Soot blowing program control system for boiler of thermal power generating unit - Google Patents

Abstract

The disclosure relates to the field of thermal power generation, in particular to a soot blowing program control system of a boiler of a thermal power generating unit. In the soot blowing program control system of the boiler of the thermal power generating unit, a PLC (programmable logic controller) is connected with an upper computer and a power cabinet and is used for generating control instructions and state display information, wherein the state display information is used for indicating the running state of the system, and the control instructions are determined according to received on-site state signals, interlocking signals and user operation instructions; the power cabinet is used for controlling the soot blower and/or the steam pipeline valve to act according to the control instruction; the upper computer is used for displaying state display information and receiving user operation instructions. Therefore, on one hand, the industrial personal computer with higher professionality can be replaced by the upper computer, the timely effectiveness of spare parts is improved, on the other hand, the links of signal receiving and transmitting of the soot blowing program control system of the motor group boiler can be reduced, namely, network links are reduced, the anti-interference performance and stability of the soot blowing program control system of the thermal power unit boiler are improved, and the method has a better popularization prospect.

Description

Soot blowing program control system for boiler of thermal power generating unit

Technical Field

The disclosure relates to the field of thermal power generation, in particular to a soot blowing program control system of a boiler of a thermal power generating unit.

Background

For coal-fired boilers, the problems of coking of a water-cooled wall of a hearth, coke hanging of a high-temperature superheater and a reheater, ash in a heated area at the tail part and the like often occur, and the thermal efficiency of the boiler is reduced. Coking and ash deposition can cause overtemperature of a heating surface, aggravate corrosion of the heating surface, shorten service life of the heating surface, cause leakage of a furnace tube when serious, and influence normal operation of a boiler, so that a soot blowing program control system of the boiler is particularly important.

At present, information transmission is realized between an industrial personal computer and equipment for displaying an interactive interface in the existing boiler soot blowing program control system through a network extension transmitter and a network extension receiver, the failure rate of the transmitter and the receiver is relatively high, and once the failure occurs, the safety and the stable operation of the soot blowing system are also threatened.

Disclosure of Invention

The purpose of the present disclosure is to provide a thermal power generating unit boiler soot blowing program control system to improve the stability and the reliability of the thermal power generating unit boiler soot blowing program control system.

In order to achieve the above purpose, the present disclosure provides a soot blowing program control system for a boiler of a thermal power generating unit, which comprises a PLC (Programmable Logic Controller ) controller, an upper computer and at least one power cabinet;

the PLC is connected with the upper computer and the power cabinet and is used for generating a control instruction and state display information, wherein the state display information is used for indicating the running state of the system, and the control instruction is determined according to the received on-site state signal, the received interlocking signal and the received user operation instruction;

the power cabinet is used for controlling the soot blower and/or the steam pipeline valve to act according to the control instruction;

and the upper computer is used for displaying the state display information and receiving a user operation instruction.

Optionally, the PLC controller includes a PLC communication card, and an RJ45 port of the PLC communication card is connected with an RJ45 port of the upper computer through a network cable, so as to implement transmission of the status display information and the user operation instruction.

Optionally, when receiving a user operation instruction indicating to perform soot blowing operation and the combustion in the furnace is stable, the PLC controller is configured to generate a first control instruction if it is determined that the system power, the soot blowing steam pressure and the boiler load meet a first soot blowing condition, where the first control instruction is used to instruct the power cabinet to sequentially control the soot blowers in the system to sequentially act to a corresponding first target position according to a first preset sequence, and then start soot blowing.

Optionally, the first sootblowing condition includes:

the system power is in a preset power allowable range, the soot blowing steam pressure is in a preset pressure allowable range, and the boiler load is in a preset load allowable range.

Optionally, the PLC controller is configured to generate a second control instruction when receiving a user operation instruction indicating to perform a soot blowing operation and the boiler load is less than the load threshold, where the second control instruction is configured to instruct the power cabinet to control the soot blower of the air preheater to act to a corresponding first target position according to a second preset sequence, and then start soot blowing.

Optionally, the PLC controller is further configured to generate a third control instruction when receiving a user operation instruction for instructing to stop the soot blowing operation, or determining that the soot blowing operation is completed according to the on-site status signal, where the third control instruction is used to instruct the power cabinet to control the soot blower performing the soot blowing operation according to a third preset sequence to stop the soot blowing, and act to a corresponding second target position.

Optionally, the PLC controller is further configured to control the power cabinet to repeatedly execute the target action at the previous time if the current soot blower does not act to the target position within the preset duration; and if the number of times of repeatedly executing the target action reaches a number threshold, controlling the next soot blower action in a preset sequence.

Optionally, the PLC controller is further configured to generate corresponding alarm information when any one of the following conditions is satisfied:

the power supply of the motor of the soot blower is lost;

the soot blower fails to start;

the soot blower operating time exceeds a limit value.

Optionally, the PLC controller is further configured to determine, when receiving a user operation instruction indicating a target opening of the steam pipeline valve, an estimated value of the soot blowing steam pressure according to the target opening; and if the predicted value is within the allowable range of the steam pressure, generating a fourth control instruction, wherein the fourth control instruction is used for indicating the power cabinet to control the opening of the steam pipeline valve to act to the target opening.

Optionally, the PLC controller is further configured to generate a prompt message if the preset value is not within the allowable range of the steam pressure, and send the prompt message to the upper computer, where the prompt message is used to prompt the user that the target opening is set to be wrong.

Optionally, the status display information includes a status of each sootblower and a status of each steam line valve.

Optionally, the soot blowing program control system of the boiler of the thermal power generating unit also comprises a DCS (Distributed Control System ) cabinet,

the DCS cabinet is connected with the PLC and used for displaying the state display information and receiving user operation instructions, the DCS cabinet and the upper computer are a group of redundant equipment, and the positions of the DCS cabinet and the upper computer are different.

Optionally, a communication line interface of the PLC controller is connected with the DCS cabinet, so as to realize transmission of the status display information and the user operation instruction, wherein the status display information includes trip information;

the hard-wired interface of the PLC is connected with the DCS cabinet and used for sending the tripping information to the DCS cabinet.

Optionally, the soot blowing program control system of the boiler of the thermal power generating unit further comprises a main power supply and a standby power supply;

the power cabinet is connected with the main power supply and the standby power supply;

the main power supply is used for supplying power to the power cabinet;

and the standby power supply is used for supplying power to the power cabinet when the main power supply is abnormal.

Optionally, the power cabinet includes:

the first power cabinet is used for controlling the action of the steam pipeline valve;

the second power cabinet is used for controlling the soot blower on the first side of the air preheater to act and controlling the soot blower on the first target area of the hearth to act;

the third power cabinet is used for controlling the action of the soot blower positioned on the second side of the air preheater and controlling the action of the soot blower positioned in the second target area of the hearth;

the fourth power cabinet is used for controlling the soot blower on the first side of the flue to act;

and the fifth power cabinet is used for controlling the soot blower on the second side of the flue to act.

In the technical scheme, the PLC is connected with the upper computer and the power cabinet and is used for generating a control instruction and state display information, wherein the state display information is used for indicating the running state of the system, and the control instruction is determined according to the received on-site state signal, the interlocking signal and the user operation instruction; the power cabinet is used for controlling the soot blower and/or the steam pipeline valve to act according to the control instruction; the upper computer is used for displaying state display information and receiving user operation instructions. Therefore, on one hand, the industrial personal computer with higher professionality can be replaced by the upper computer, the timely effectiveness of spare parts is improved, on the other hand, the links of signal receiving and transmitting of the soot blowing program control system of the motor group boiler can be reduced, namely, network links are reduced, so that the fault point which possibly breaks down and the interference of the external environment to the communication links are reduced, the anti-interference performance and stability of the soot blowing program control system of the thermal power unit boiler are improved, and the method has a good popularization prospect.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

FIG. 1 is a block diagram of a thermal power generating unit boiler soot blowing program control system provided by an exemplary embodiment of the present disclosure.

FIG. 2 is a schematic diagram of a thermal power generating unit boiler soot blowing program control system provided by an exemplary embodiment of the present disclosure.

Fig. 3 is a schematic diagram of an upper computer interaction interface according to an exemplary embodiment of the present disclosure.

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

It should be noted that, all actions for acquiring signals, information or data in the present disclosure are performed under the condition of conforming to the corresponding data protection rule policy of the country of the location and obtaining the authorization given by the owner of the corresponding device.

FIG. 1 is a block diagram of a thermal power generating unit boiler soot blowing program control system provided by an exemplary embodiment of the present disclosure. As shown in fig. 1, the soot blowing program control system of the boiler of the thermal power generating unit comprises a PLC (programmable logic controller) 101, an upper computer 102 and at least one power cabinet 103;

the PLC 101 is connected with the upper computer 102 and the power cabinet 103 and is used for generating control instructions and state display information, wherein the state display information is used for indicating the running state of the system, and the control instructions are determined according to received on-site state signals, interlocking signals and user operation instructions;

a power cabinet 103 for controlling the actions of the soot blower and/or steam pipeline valve according to the control instruction;

the upper computer 102 is used for displaying status display information and receiving user operation instructions.

By way of example, the field state signal may include a vapor line pressure signal, a temperature signal, a valve opening signal, a motor current signal, a motor voltage signal, a valve current signal, and the like. The interlock signal may include an MFT signal (trip signal), a program start signal, a program interrupt signal, a program end signal, a program reset signal, etc. The PLC controller 101 may be hard-wired to the signaling device, and the PLC controller 101 may be disposed in a program controlled cabinet. The user operation instructions may be issued by the user based on the interactive interface presented by the host computer 102. The PLC controller 101 may be provided with a pre-trained control model, where the control model may be input as a field state signal, an interlock signal, and a user operation command, and the output of the control model may be a control command. The status display information may be generated based on the field status signal, the interlock signal.

The upper computer 102 can be a common office computer, and can be connected with the PLC 101 through a network cable to replace an industrial personal computer with higher professionality in the related technology, so that the timely effectiveness of spare parts can be improved, control faults can be eliminated in time, the guarantee is provided for the safe and stable operation of a soot blowing program control system, and the work of an operation or maintenance personnel can be more convenient.

In an alternative embodiment, the PLC controller 101 may include a PLC communication card, where an RJ45 port of the PLC communication card is connected to an RJ45 port of the upper computer 102 through a network cable, so as to implement transmission of status display information and user operation instructions between the PLC controller 101 and the upper computer 102. Therefore, the upper computer 102 can be directly in communication connection with the PLC 101, compared with the information transmission between the industrial personal computer and the equipment for displaying the interactive interface through the network extension transmitter and the network extension receiver, the link of signal receiving and transmitting is reduced, namely, the network link is reduced, so that the fault point where faults possibly occur and the interference of the external environment on the communication link are reduced, the anti-interference performance and stability of the soot blowing program control system of the boiler of the thermal power generating unit are improved, and the method has a better popularization prospect.

In the above technical solution, the PLC controller 101 is connected with the upper computer 102 and the power cabinet 103, and is configured to generate a control instruction and status display information, where the status display information is used to indicate a system running status, and the control instruction is determined according to a received on-site status signal, an interlock signal, and a user operation instruction; a power cabinet 103 for controlling the actions of the soot blower and/or steam pipeline valve according to the control instruction; the upper computer 102 is used for displaying status display information and receiving user operation instructions. Therefore, on one hand, the high-professional industrial personal computer can be replaced by the upper computer 102, the timely effectiveness of spare parts is improved, on the other hand, the links of signal receiving and transmitting of the soot blowing program control system of the motor group boiler can be reduced, namely, network links are reduced, so that the fault point which possibly breaks down and the interference of the external environment on communication links are reduced, the anti-interference performance and stability of the soot blowing program control system of the thermal power unit boiler are improved, and the method has a good popularization prospect.

Under normal conditions, when the boiler needs to clean deposited ash on the heating surface of the boiler through the soot blower, the soot blower can be controlled to work by using a soot blowing program control system of the boiler of the thermal power generating unit. When the boiler MFT cannot perform soot blowing operation, the working soot blower automatically returns, the control system closes the steam pipeline valve, and the soot blowing flow is stopped.

In an alternative embodiment, the PLC controller 101 is configured to generate the first control command if it is determined that the system power, the sootblowing steam pressure, and the boiler load satisfy the first sootblowing condition when a user operation command indicating a sootblowing operation is received and the furnace combustion is stable.

The first control instruction is used for instructing the power cabinet 103 to sequentially control the soot blowers in the system to sequentially move to the corresponding first target positions according to a first preset sequence, and then start soot blowing.

For example, the first sootblowing condition may include: the system power is in a preset power allowable range, the soot blowing steam pressure is in a preset pressure allowable range, and the boiler load is in a preset load allowable range.

For example, if the change in the boiler temperature within the preset reference period is less than the preset temperature change threshold and the change in the boiler pressure within the preset reference period is less than the preset pressure change threshold, the stability of the combustion in the boiler may be determined. The power allowable range, the pressure allowable range, and the load allowable range may be preset based on the relevant history data. If a user operation instruction for indicating to perform the soot blowing operation is received, the user can be determined to intend to control the soot blowing operation to start, and at the moment, whether the current soot blowing program control system of the boiler of the thermal power generating unit can realize the soot blowing operation under the condition of ensuring the operation safety of the current soot blowing program control system of the boiler of the thermal power generating unit can be determined by combining the combustion state of the boiler, the system power, the soot blowing steam pressure and the boiler load. If the user operation instruction for performing the soot blowing operation is received and the combustion in the furnace is stable, and the first soot blowing condition is determined to be met, the soot blowing program control system of the boiler of the thermal power generating unit can be determined to realize the soot blowing operation under the condition of ensuring the operation safety, and at the moment, a first control instruction can be generated to realize the starting of the soot blowing operation.

The first preset sequence can be preset based on actual requirements, and it is required to be noted that the soot blowing program control system of the boiler of the thermal power generating unit does not allow more than 2 soot blowers to be debugged simultaneously, because the soot blowing steam pipeline system is difficult to provide the steam quantity required by the simultaneous operation of the plurality of soot blowers and the boiler combustion can be influenced. That is, at most two sootblowers are allowed to be commissioned simultaneously in a preset sequence. Sootblowers can be divided into two main groups: the left front wall group and the right rear wall group are divided into 3 groups according to the types of soot blowers: a hearth short blowing group; a long telescopic fixed rotary soot blower group; air preheater soot blower AH group. Under normal conditions, the whole system allows two soot blowers in two groups of left and right walls at corresponding positions to be commissioned simultaneously, such as an A07 soot blower arranged in the front furnace wall group and an A14 arranged in the rear furnace wall group to be extended or retracted simultaneously. When the power cabinet 103 receives the first control instruction, the soot blowers can be controlled to act to the first target position in sequence according to the first preset sequence, and then the soot blowers start to blow, if the soot blowers act to the first position, it can be determined that the soot blowers are extended completely, and the soot blowers can start to blow. And determining that the starting of the soot blowing operation is finished until the last soot blower involved in the first preset sequence starts to blow soot.

In an alternative embodiment, the PLC controller 101 is configured to generate the second control command when a user operation command indicating a soot blowing operation is received and the boiler load is less than the load threshold.

The second control instruction is used for instructing the power cabinet 103 to control the soot blower of the air preheater to act to the corresponding first target position according to the second preset sequence, and then start soot blowing.

For example, the load threshold may be preset, for example, may be set to 30% bmcr. If the boiler load is less than the load threshold, it may be determined that the boiler itself is not providing sufficient steam to the sootblowing steam piping system to be suitable for the sootblowing operation needs, at which time the sootblowing operation of the air preheater may be performed, and the other sootblowers are not permitted to perform the sootblowing operation. The second preset sequence may be preset based on actual requirements and at most allows for simultaneous commissioning of both sootblowers in the preset sequence. Thus, the operation safety of the thermal power generating unit can be ensured.

In an alternative embodiment, the PLC controller 101 is further configured to generate a third control instruction when receiving a user operation instruction indicating to stop the sootblowing operation, or determining that the sootblowing operation is completed according to the on-site status signal.

The third control instruction is used for instructing the power cabinet 103 to control the soot blower performing the soot blowing operation to stop soot blowing according to a third preset sequence, and to act to a corresponding second target position.

For example, whether the soot blowing operation is completed may be determined by the control model described above, and if it is determined that the soot blowing operation is completed, the control model may output a third control instruction. The second target position may be a position when the soot blower is not in operation, or may be understood as an initial position after the soot blower is installed, and if the soot blower moves to the second target position, it may be determined that the soot blower has completed to retract, and control of the soot blower may be exited. The third preset sequence may be preset based on actual requirements and at most allows for the simultaneous commissioning of both sootblowers in the preset sequence.

In an alternative embodiment, the PLC controller 101 is further configured to control the power cabinet 103 to repeatedly execute the target action at the previous time if the current sootblower does not act to the target position within the preset time period; and if the number of times of repeatedly executing the target action reaches the number threshold, controlling the next soot blower action in the preset sequence.

For example, if the current soot blower does not move to the target location within the preset time period, it may be determined that the control of the soot blower by the power cabinet 103 fails, resulting in failure to reach the specified location, failure to begin soot blowing, or failure to exit control of the soot blower. For example, if the PLC controller 101 controls the power cabinet 103 to control the current sootblower to the first target position at the previous time, but the current sootblower does not move to the first target position within the preset duration, the PLC controller 101 may control the power cabinet 103 to perform the operation of controlling the current sootblower to move to the first target position again, and attempt to solve the failure by repeatedly performing the previous time of the target operation, if the number of times of repeatedly performing the target operation reaches the number of times threshold, it may be determined that the failure needs to be manually repaired and removed, and the next sootblower operation in the preset sequence may be controlled to enable the system to complete the start or exit of the sootblowing operation. Wherein the number of times threshold may be preset, for example, may be set to 1.

In an alternative embodiment, the PLC controller 101 is further configured to generate the corresponding alarm information when any one of the following conditions is satisfied:

the power supply of the motor of the soot blower is lost;

the soot blower fails to start;

the soot blower operating time exceeds a limit value.

Therefore, an operator can be reminded to treat the problematic soot blower even if the soot blower is used for a single soot blower, and excessive use of the single soot blower is avoided.

In an alternative embodiment, the PLC controller 101 is further configured to determine, when receiving a user operation instruction indicating a target opening of the steam line valve, an estimated value of the soot blowing steam pressure according to the target opening; if the predicted value is within the allowable range of the steam pressure, a fourth control command is generated.

The fourth control instruction is used for instructing the power cabinet 103 to control the opening of the steam pipeline valve to move to the target opening.

For example, the pre-estimated value of the soot blowing steam pressure may be determined based on a pre-trained pre-estimated model, and the input value of the pre-estimated model may be the target opening, and output to the pre-estimated value that may be the soot blowing steam pressure. If the predicted value is within the allowable range of the steam pressure, it can be determined that the thermal power unit can still be in a safe and stable running state if the opening of the valve of the steam pipeline is controlled to the target opening, and a fourth control instruction can be generated at the moment so as to control the valve according to the requirement of a user.

In another alternative embodiment, the PLC controller 101 is further configured to generate a prompt message if the predicted value is not within the allowable range of the steam pressure, and send the prompt message to the upper computer 102.

The prompt information is used for prompting the user that the target opening is set with errors.

For example, if the estimated value is not within the allowable range of the steam pressure, it may be determined that if the opening of the steam pipeline valve is controlled to the target opening, the thermal power unit is difficult to be in a safe and stable operation state, and in order to ensure the operation safety of the thermal power unit, a prompt message may be output to remind an operator to reset the target opening. Therefore, the error control of operators on the steam pipeline valve can be avoided, and the operation safety of the thermal power generating unit is improved.

In an alternative embodiment, the PLC controller 101 is further configured to generate the corresponding alarm information when any one of the following conditions is satisfied:

overload of the steam pipeline valve;

failure of steam line valve regulation;

the sootblowing steam pressure is outside the allowable range of steam pressure.

Therefore, operators can be reminded to treat the steam pipeline valve with problems even so as to ensure the operation safety of the thermal power generating unit.

As shown in FIG. 2, in an alternative embodiment, the thermal power plant boiler soot blowing program control system further comprises a DCS cabinet 104;

the DCS cabinet 104 is connected with the PLC controller 101, and is used for displaying status display information and receiving user operation instructions, where the DCS cabinet 104 and the upper computer 102 are a set of redundant devices, and the positions of the DCS cabinet 104 and the upper computer 102 are different.

The DCS cabinet 104 has similar functions to the host computer 102, and can be used for realizing man-machine interaction. The positions of the DCS cabinet 104 and the upper computer 102 are different, so that the same interactive interface can be provided for operators at different positions to realize corresponding control, the DCS cabinet 104 and the upper computer 102 are redundant, the usability of a soot blowing program control system of a boiler of a thermal power unit can be improved, and the problem that the system control cannot be realized due to sudden damage of the DCS cabinet 104 or the upper computer 102 is avoided.

Optionally, the communication line interface of the PLC controller 101 is connected with the DCS cabinet 104 to realize transmission of status display information and user operation instructions, wherein the status display information includes trip information; the hard-wired interface of the PLC controller 101 is connected to the DCS cabinet 104 for transmitting trip information to the DCS cabinet 104.

In the application process of the soot blowing program control system of the thermal power unit boiler, the influence degree of tripping information on the whole system is high, two transmission paths are arranged for the transmission of the tripping information, the tripping information can be ensured to be transmitted to the DCS cabinet 104, and the reliability of the soot blowing program control system of the thermal power unit boiler is improved.

In an alternative embodiment, the status display information may include the status of each sootblower and the status of each steam line valve. Thus, operators can know the soot blowing state of the boiler of the thermal power unit, namely the running state of the system based on the content displayed by the upper computer 102, so that the usability of the soot blowing program control system of the boiler of the thermal power unit and the use experience of the operators are improved.

The soot blowing program control system of the thermal power unit boiler adopts the PLC 101 as a control host, the man-machine interaction is completed through the upper computer 102, and the man-machine interaction process can be completed on the upper computer 102 no matter the soot blowing program control system of the thermal power unit boiler is under automatic control or manual control. The upper computer 102 may not participate in the soot blowing system logic control, only the man-machine interface work is completed.

The interactive interface of the upper computer 102 can mainly complete the switching of the soot blower group and the single soot blower, the starting/interrupting/ending operation of the program in a remote mode, and the like. A row of 12 indicator lights may be provided on the interactive interface, and the description thereof may be as shown in table 1:

TABLE 1

The piping system picture represents the arrangement of the sootblowing steam piping. There may be 1 red 1 green 2 lamp-attached buttons beside each valve symbol for on/off operation and status display of the valve when "DCS is manual", respectively. When an overload fault occurs in a valve, the valve overload lamp is turned on in the lower right corner. A pressure switch is arranged on the pipeline for detecting the soot blowing steam pressure and sending a signal to the PLC controller 101.

Fig. 3 is a schematic diagram of an upper computer interaction interface according to an exemplary embodiment of the present disclosure. With reference to fig. 3, the interaction interface of the host computer 102 provided by the present disclosure may be more clearly shown.

As shown in FIG. 2, the hearth short soot blower group image is divided into left and right parts, showing the status of 66 soot blowers arranged on the left/right wall and the front/rear wall of the boiler hearth. Each soot blower corresponds to a button with a lamp. The button is used to manually activate the sootblower by an operator when "DCS is manual", as allowed by the "set of activation" conditions. After the soot blower leaves the initial position outside the furnace (i.e. leaves the second target position), the indicator light turns red; when the sootblower is in the off-furnace initial position (i.e., in the second target position), the indicator light is white. Each group of soot blowers is also provided with two groups of indicator lamps, when a certain soot blower in the group advances, the lamp of the soot blower which is in progress turns red, otherwise, the lamp is the white lamp which is not in progress; when a certain soot blower in the group backs up, the lamp which is on the back up of the soot blower turns red, otherwise, the lamp is the white lamp which is on the back up of the soot blower. When the power supply of a motor of a certain group of the soot blowers is lost, the starting of the soot blowers is failed, and the working time of the soot blowers exceeds a limit value, obvious alarm display can be provided on a picture, if the system is in an automatic mode at the moment, the number of the failed soot blower can be displayed, and the corresponding indicator lamp is changed from white to red.

The soot blowing program control system of the thermal power generating unit boiler provided by the disclosure can comprise three different operation modes of in-situ manual operation, upper computer manual operation and upper computer automatic operation.

In-situ manual, commonly used for equipment commissioning, an operator may operate the sootblower via a button mounted on the in-situ sootblower. At the moment, besides overload protection of the controlled objects, the controlled objects are not linked and sequenced, so that the operation sequence and time interval need to be paid attention to during operation, and equipment damage is avoided.

The upper computer is manual, and an operator can operate the controlled object through the interactive interface of the upper computer 102 and can monitor the working state and the position of the controlled object through the indicator lamp. The operation of the soot blower is allowed to start after the corresponding "condition-possessing" indicator lights are on. The method is also suitable for maintenance and debugging and manual operation of a few controlled objects.

The upper computer is automatic, an operator can start the system through a corresponding button in an interactive interface of the upper computer 102, and a controlled object works according to a control instruction issued by the PLC 101 to finish soot blowing operation. And the working state and the position of the controlled object can be monitored. In this manner the operator cannot operate other buttons and switches that would be used in a manual manner and the start button on the sootblower in place. In the operation mode, an operator inputs the soot blower group which is expected to be put into operation and the corresponding soot blowers in the group, presses the corresponding buttons, and the corresponding indicator lights are turned on to be turned on, otherwise, the setting is turned off. After the "soot blower group selection" and the "soot blower selection" are set, for example, an "initial state" indicator light is turned on, that is, on the premise that the soot blowing system is in the "initial state", a "start program control" button is pressed to start the program, for example, a red indicator light built in the button is turned on, so that the program is started. If the lamp is not on in the initial state before starting, the mode can be switched to a DCS manual mode, and valves in improper positions are opened or closed on the interactive interface or the soot blowers are returned. After the program is started, the 'interrupt' button with the lamp is pressed, namely the program is manually requested to be interrupted, and the system automatically stops to continue running. The yellow indicator light hidden in the button is on and has alarm output. If the operator wishes to continue operation, he presses the "start" button again and the program continues from the interrupt until it ends.

When the system is in an automatic state, the system can be switched to a manual state, and when the program is running, an operator can press an end button first to reset the program and then switch to a manual mode. Otherwise, the program may continue to run, causing confusion in the controlled object actions. It should be noted that when the boiler is in operation, it is necessary to avoid stopping the valve at an intermediate position to reduce wear, and at the same time, to avoid stopping the sootblowers in the furnace to avoid damaging the heated surfaces or burning the sootblowers.

As shown in FIG. 2, in an alternative embodiment, the thermal power plant boiler soot blowing program control system further comprises a main power supply and a standby power supply;

the power cabinet 103 is connected with a main power supply 1051 and a standby power supply 1052;

a main power supply 1051 for supplying power to the power cabinet 103;

a backup power source 1052 for powering the power cabinet 103 in the event of an abnormality in the primary power source 1051.

Illustratively, the primary 1051 and backup 1052 power sources may be 380/220VAC power sources, which are redundant to each other. The backup power source 1052 may provide power to the power cabinet 103 when the primary power source 1051 is abnormal and may not provide power to the power cabinet 103 when the primary power source 1051 is not abnormal. Therefore, the stability of supplying power to the power cabinet 103 can be ensured through the arrangement of the main power supply 1051 and the standby power supply 1052, and the running stability of the soot blowing program control system of the boiler of the thermal power generating unit is further improved.

As shown in fig. 2, in an alternative embodiment, the power cabinet 103 may include:

a first power cabinet 1031 for controlling the steam pipeline valve action;

a second power cabinet 1032 for controlling the operation of the soot blowers located on the first side of the air preheater and for controlling the operation of the soot blowers located in the first target area of the furnace;

a third power cabinet 1033 for controlling the operation of the soot blowers located on the second side of the air preheater and for controlling the operation of the soot blowers located in the second target area of the furnace;

a fourth power cabinet 1034 for controlling the operation of the soot blower on the first side of the flue;

and a fifth power cabinet 1035 for controlling the operation of the sootblowers located on the second side of the flue.

For example, a first side in the present disclosure may be the left side, a second side may be the right side, a first target zone may be the left/front wall of the furnace, and a second target zone may be the right/rear wall of the furnace. Therefore, partition control of the soot blowers can be realized through the arrangement of the plurality of power cabinets 103, and the control precision of the soot blowers is improved. Based on the above, it can be determined that the soot blowing program control system of the boiler of the thermal power generating unit allows 2 soot blowers to be debugged simultaneously, so that the single soot blowers at the same position in two corresponding areas can be synchronously controlled through the arrangement of the power cabinet.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations are not described further in this disclosure in order to avoid unnecessary repetition.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims (15)

1. A soot blowing program control system of a boiler of a thermal power generating unit is characterized by comprising a PLC (programmable logic controller), an upper computer and at least one power cabinet;

the PLC is connected with the upper computer and the power cabinet and is used for generating a control instruction and state display information, wherein the state display information is used for indicating the running state of the system, and the control instruction is determined according to the received on-site state signal, the received interlocking signal and the received user operation instruction;

the power cabinet is used for controlling the soot blower and/or the steam pipeline valve to act according to the control instruction;

and the upper computer is used for displaying the state display information and receiving a user operation instruction.

2. The soot blowing program control system of a thermal power generating unit boiler according to claim 1, wherein the PLC comprises a PLC communication card, and an RJ45 port of the PLC communication card is connected with an RJ45 port of the upper computer through a network cable so as to realize the transmission of the state display information and the user operation instruction.

3. The thermal power generating unit boiler soot blowing program control system according to claim 1, wherein the PLC controller is configured to, when receiving a user operation instruction indicating a soot blowing operation and the furnace combustion is stable, generate a first control instruction if it is determined that the system power, the soot blowing steam pressure and the boiler load meet a first soot blowing condition, and the first control instruction is configured to instruct the power cabinet to sequentially operate the soot blowers in the system to a corresponding first target position according to a first preset sequence, and then start soot blowing.

4. A thermal power generating unit boiler soot blowing program control system as claimed in claim 3, wherein said first soot blowing condition comprises:

the system power is in a preset power allowable range, the soot blowing steam pressure is in a preset pressure allowable range, and the boiler load is in a preset load allowable range.

5. The thermal power generating unit boiler soot blowing program control system according to claim 1, wherein the PLC controller is configured to generate a second control instruction when receiving a user operation instruction indicating to perform a soot blowing operation and a boiler load is less than a load threshold, and the second control instruction is configured to instruct the power cabinet to control the soot blower of the air preheater to act to a corresponding first target position according to a second preset sequence, and then start soot blowing.

6. The thermal power generating unit boiler soot blowing program control system according to claim 1, wherein the PLC controller is further configured to generate a third control instruction when receiving a user operation instruction for instructing to stop the soot blowing operation or determining that the soot blowing operation is completed according to the on-site status signal, and the third control instruction is configured to instruct the power cabinet to control the soot blower performing the soot blowing operation to stop the soot blowing in a third preset sequence and to move to the corresponding second target position.

7. The thermal power generating unit boiler soot blowing program control system according to any one of claims 3 to 6, wherein the PLC controller is further configured to control the power cabinet to repeatedly execute the target action at the previous time if the current soot blower does not act to the target position within the preset time period; and if the number of times of repeatedly executing the target action reaches a number threshold, controlling the next soot blower action in a preset sequence.

8. The thermal power generating unit boiler soot blowing program control system of claim 1, wherein the PLC controller is further configured to generate corresponding alarm information when any one of the following conditions is satisfied:

the power supply of the motor of the soot blower is lost;

the soot blower fails to start;

the soot blower operating time exceeds a limit value.

9. The thermal power generating unit boiler soot blowing program control system according to claim 1, wherein the PLC controller is further configured to determine an estimated soot blowing steam pressure value according to a target opening degree when receiving a user operation instruction indicating the target opening degree of the steam pipe valve; and if the predicted value is within the allowable range of the steam pressure, generating a fourth control instruction, wherein the fourth control instruction is used for indicating the power cabinet to control the opening of the steam pipeline valve to act to the target opening.

10. The soot blowing program control system of a thermal power generating unit boiler according to claim 9, wherein the PLC controller is further configured to generate a prompt message if the predicted value is not within a steam pressure allowable range, and send the prompt message to the upper computer, where the prompt message is configured to prompt a user that a target opening is set to be wrong.

11. The thermal power generating unit boiler soot blowing program control system of claim 1, wherein said status display information comprises a status of each soot blower and a status of each steam line valve.

12. The soot blowing program control system of a thermal power generating unit boiler according to claim 1, further comprising a DCS cabinet,

the DCS cabinet is connected with the PLC and used for displaying the state display information and receiving user operation instructions, the DCS cabinet and the upper computer are a group of redundant equipment, and the positions of the DCS cabinet and the upper computer are different.

13. The soot blowing program control system of a thermal power generating unit boiler according to claim 12, wherein,

the communication line interface of the PLC is connected with the DCS cabinet to realize the transmission of the state display information and the user operation instruction, wherein the state display information comprises tripping information;

the hard-wired interface of the PLC is connected with the DCS cabinet and used for sending the tripping information to the DCS cabinet.

14. The thermal power generating unit boiler soot blowing program control system of claim 1, further comprising a main power supply and a standby power supply;

the power cabinet is connected with the main power supply and the standby power supply;

the main power supply is used for supplying power to the power cabinet;

and the standby power supply is used for supplying power to the power cabinet when the main power supply is abnormal.

15. The thermal power generating unit boiler soot blowing program control system of claim 1, wherein said power cabinet comprises:

the first power cabinet is used for controlling the action of the steam pipeline valve;

the second power cabinet is used for controlling the soot blower on the first side of the air preheater to act and controlling the soot blower on the first target area of the hearth to act;

the third power cabinet is used for controlling the action of the soot blower positioned on the second side of the air preheater and controlling the action of the soot blower positioned in the second target area of the hearth;

the fourth power cabinet is used for controlling the soot blower on the first side of the flue to act;

and the fifth power cabinet is used for controlling the soot blower on the second side of the flue to act.