Desulfurization interlocking test system

Abstract

The invention provides a desulfurization interlocking test system which is characterized in that a DCS (Distributed Control System) control cabinet acquires parameters and states of field equipment and sends acquired data to a test device; the testing device judges whether the field equipment meets interlocking testing conditions or not, and if yes, a signal for triggering interlocking protection is sent to the engineer station; the engineer station sends a control signal of the equipment A to the testing device, the testing device judges whether the control signal is normal or not, if the control signal is normal, the control signal is output to the DCS control cabinet, and then the control signal is output to the equipment A to execute corresponding control so as to change the state of the equipment A; the DCS control cabinet collects the parameters and the state of the equipment A after the state is changed, and sends the collected data to the engineer station through the test device; the engineer station judges whether the state of the equipment B is normal or not, if yes, a control signal of the equipment B is sent to the testing device, if not, the testing device judges whether the control signal is normal or not, and if yes, the control signal is output to the DCS control cabinet and then output to the equipment B to execute corresponding control so as to change the state of the equipment B.

Description

Technical Field

[0001] The invention relates to a desulfurization interlocking test system. Background Art

[0002] At present, when testing the interlocking logic of desulfurization projects, the parameter values ​​are usually assigned manually in the DCS operation interface of the engineer station to simulate the action conditions of the interlocking. The manual forced assignment method cannot test the effectiveness of the entire DCS interlocking logic, requires a lot of manpower, and cannot realize the online simulation function of the DCS system of the engineering project.

[0003] The national invention patent with the patent number CN202111602054.1 discloses "a verification system and method for non-safety-level DCS logic loops in nuclear power plants". The method described in the invention application is as follows: including a control terminal, a simulation server, a communication unit and a DCS control cabinet; the control terminal matches the corresponding simulation input interface model according to the logic event series according to the test instruction and assigns values ​​in sequence, and outputs the verification result; the simulation server performs simulation operations according to the assignment of the control terminal and sends the input signal value of each logic event series of each non-safety-level DCS logic loop in sequence through the communication unit; the DCS control cabinet performs non-safety-level DCS logic loop operations according to the input signal value, and returns the logic loop operation results to the simulation server through the communication unit. The present invention realizes the comprehensive verification of non-safety-level DCS logic loops, solves the problem of missing and missing verification, and can also solve the problem that a large number of logic loop combination tests cannot be carried out manually, greatly improving the test efficiency and reliability, and has a high degree of automation.

[0004] The existing technology includes a control terminal, a simulation server, a communication unit and a DCS control cabinet. The control terminal matches the corresponding simulation input interface model according to the logic event series according to the test instruction and assigns values ​​in sequence, and outputs the verification result. The control terminal is connected to the simulation server, and the simulation server is connected to the DCS control cabinet. Only the test of the DCS logic loop is completed, and the control and signal verification of the field equipment cannot be realized, that is, the hardware loop from the DCS system to the field equipment cannot be verified. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the interlocking test device sends / receives DCS control cabinet and engineer station signals according to normal interlocking test logic. The present invention realizes online verification of interlocking, solves the problem of manual forced assignment, can carry out the function of online simulation of DCS system of engineering project, and improves test efficiency and reliability of control system.

[0006] In order to solve the above technical problems, the present invention provides a desulfurization interlocking test system, including: field equipment, DCS control cabinet, test device, engineer station; the field equipment includes at least two interlocking controlled devices A and B;

[0007] The field equipment is connected to the DCS control cabinet by hard connection or communication through cables; the DCS control cabinet is connected to the test device by communication, and the test device is connected to the engineer station by communication; the engineer station is a terminal installed with DCS configuration software;

[0008] The DCS control cabinet collects the parameters and status of the field equipment and sends the collected data to the test device; the test device determines whether the field equipment meets the interlocking test conditions, and if so, sends a signal to trigger the interlocking protection to the engineer station;

[0009] The engineer station sends a control signal of device A to the test device, and the test device determines whether the control signal is normal. If normal, the control signal is output to the DCS control cabinet, and then output to device A to perform corresponding control to change the state of device A;

[0010] The DCS control cabinet collects the parameters and status of device A after the state is changed, and sends the collected data to the engineer station through the test device; the engineer station determines whether the state of device B is normal, and if normal, sends a control signal of device B to the test device, and the test device determines whether the control signal is normal, and if normal, outputs the control signal to the DCS control cabinet, and then outputs it to device B to execute corresponding control to change the state of device B.

[0011] In a preferred embodiment: the control signal includes a closing signal, a tripping signal, a temperature signal, a flow signal, a current signal, a voltage signal or a pressure signal.

[0012] In a preferred embodiment: the equipment A and the equipment B are bag-type dust cleaning fans, ash hoppers, chute fluidizing fans or high-pressure water pumps.

[0013] The present invention also provides a desulfurization interlocking test system, comprising: field equipment, a DCS control cabinet, a test device, and an engineer station; the field equipment comprises at least two interlocking controlled devices A and B;

[0014] The field equipment is connected to the test device by hard connection or communication through cables; the test device is connected to the DCS control cabinet by hard connection or communication, and the DCS control cabinet is connected to the engineer station by communication; the engineer station is a terminal installed with DCS configuration software;

[0015] The DCS control cabinet collects the parameters and status of the field equipment through the test device, and sends the collected data to the test device; the test device determines whether the field equipment meets the interlocking test conditions, and if so, sends a signal to trigger the interlocking protection to the engineer station;

[0016] The engineer station sends a control signal of device A to the test device, and the test device determines whether the control signal is normal. If normal, the test device outputs the control signal to device A to perform corresponding control to change the state of device A;

[0017] The DCS control cabinet collects the parameters and status of device A after the state is changed, and sends the collected data to the engineer station; the engineer station determines whether the state of device B is normal, and if normal, sends a control signal of device B to the test device, and the test device determines whether the control signal is normal, and if normal, outputs the control signal to device B to execute corresponding control to change the state of device B.

[0018] In a preferred embodiment: the control signal includes a closing signal, a tripping signal, a temperature signal, a flow signal, a current signal, a voltage signal or a pressure signal.

[0019] In a preferred embodiment: the equipment A and the equipment B are bag-type dust cleaning fans, ash hoppers, chute fluidizing fans or high-pressure water pumps.

[0020] The present invention also provides a desulfurization interlocking test system, comprising: field equipment, a DCS control cabinet, a test device, and an engineer station; the field equipment comprises at least two interlocking controlled devices A and B;

[0021] The field equipment is connected to the DCS control cabinet by hard connection or communication through cables; the DCS control cabinet is connected to the test device by communication, and the test device is connected to the engineer station by communication; the engineer station is a terminal with DCS configuration software installed; the test device is installed in the terminal in the form of software;

[0022] The DCS control cabinet collects the parameters and status of the field equipment and sends the collected data to the test device; the test device determines whether the field equipment meets the interlocking test conditions, and if so, sends a signal to trigger the interlocking protection to the engineer station;

[0023] The engineer station sends a control signal of device A to the test device, and the test device determines whether the control signal is normal. If normal, the control signal is output to the DCS control cabinet, and then output to device A to perform corresponding control to change the state of device A;

[0024] The DCS control cabinet collects the parameters and status of device A after the state is changed, and sends the collected data to the engineer station through the test device; the engineer station determines whether the state of device B is normal, and if normal, sends a control signal of device B to the test device, and the test device determines whether the control signal is normal, and if normal, outputs the control signal to the DCS control cabinet, and then outputs it to device B to execute corresponding control to change the state of device B.

[0025] In a preferred embodiment: the control signal includes a closing signal, a tripping signal, a temperature signal, a flow signal, a current signal, a voltage signal or a pressure signal.

[0026] In a preferred embodiment: the equipment A and the equipment B are bag-type dust cleaning fans, ash hoppers, chute fluidizing fans or high-pressure water pumps.

[0027] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0028] A desulfurization interlocking test system of the present invention not only simulates the change of parameter quantity, triggers the interlocking action condition, verifies the DCS logic circuit, but also establishes the signal connection between the field equipment, the DCS control cabinet and the engineer station, realizes the control from the DCS system to the field equipment and the hardware circuit signal verification, and improves the test efficiency and the reliability of the control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a system schematic diagram of a preferred embodiment 1 of the present invention;

[0030] Figure 2 This is a flow chart of a preferred embodiment 1 of the present invention;

[0031] Figure 3 This is a system schematic diagram of a preferred embodiment 2 of the present invention;

[0032] Figure 4 This is a system schematic diagram of a preferred embodiment 3 of the present invention;

[0033] Figure 5 This is a flow chart of preferred embodiment 3 of the present invention. DETAILED DESCRIPTION

[0034] In order to make the technical solutions and features of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific examples. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0035] Example 1

[0036] like Figure 1 ,The test system includes field equipment, DCS control cabinet, test device, and engineer station.

[0037] Field equipment refers to motors, pneumatic valves, electric valves, measuring equipment (such as flow meters), switch cabinets, and local cabinets.

[0038] DCS control cabinet refers to a DCS cabinet generally installed in an electronic equipment room. The DCS control cabinet includes components such as controllers, input / output modules, and communication modules. It is one of the commonly used equipment in industrial automation control and can realize intelligent control and monitoring of the production process.

[0039] The test device has components such as input / output, communication, etc. The test device in this embodiment is used as a temporary test device and can be removed after all tests are completed.

[0040] The engineer station is a computer with DCS configuration software installed. It is used by on-site professional engineers to write and modify control logic programs, including modifying graphics, parameter settings, database configuration, offline query, etc.

[0041] The field equipment is connected to the DCS control cabinet through cables in a hard-wired or communication manner, sending the parameters and status (switch quantity, analog quantity) of the field equipment to the DCS control cabinet, and also receiving signals (switch quantity, analog quantity) from the DCS control cabinet.

[0042] The DCS control cabinet is connected to the test device through communication, and the test device is also connected to the engineer station through communication.

[0043] Taking the interlock protection test of the dust cleaning fan of a bag filter as an example, the working process and method of the interlock test system of the present invention are explained.

[0044] like Figure 2 , which is the flow chart of interlock protection test for dust bag collector cleaning fan.

[0045] The test device first collects the parameters and status of the on-site equipment through the DCS control cabinet to ensure that the conditions for the interlocking test are met. The 1# fan has been started and the operating parameters / status are normal. The 2# fan is used as a backup device. The 2# fan has not been started and is in normal status.

[0046] If the interlocking test conditions are met, the test device sends a signal to trigger the interlocking protection: the shaft temperature of the 1# fan is 95°C, and the DCS system installed at the engineering station determines that the fan bearing temperature exceeds the set safety threshold of 90°C, triggering the interlocking protection.

[0047] The DCS system (engineer station) sends a trip signal of fan 1# to the test device. The test device determines whether the trip signal is normal. Only when it is confirmed that it is the trip signal of fan 1# can it output the signal to the DCS control cabinet, and then to the power circuit of fan 1# to execute the trip action, disconnect the power supply of fan 1#, and fan 1# stops running.

[0048] The status signal of 1# fan changes from closed to open, and the status signal is returned to the DCS control cabinet, and then to the test device, and then to the DCS system. The DCS system receives the tripping status signal of 1# fan and determines whether the status of the standby fan 2# fan is normal. If the status of 2# fan is normal, the interlock starts 2# fan.

[0049] The DCS system sends a closing signal to the test device. The test device determines whether the closing signal is normal. Only when it is confirmed that it is the closing signal of the 2# fan can it output the signal to the DCS control cabinet, and then to the 2# fan power circuit to execute the closing action, connect the power supply of the 1# fan, and start the 2# fan.

[0050] The 2# fan returns the status signal to the DCS system at the engineer station through the DCS control cabinet and test device.

[0051] The DCS system configuration software screen is updated and the test device saves the entire test process data.

[0052] During the entire test process, if the test device determines that there is an abnormal state, it will stop the test process and output the abnormal situation to inform the tester.

[0053] The test device needs to judge the signal sent by the DCS system to fully verify the DCS system logic circuit. The test device does not judge the signal returned by the field equipment through the DCS control cabinet because the cable connection from the field equipment to the DCS control cabinet has been checked before the interlocking test. If the connecting cable has not been checked, the test device also needs to judge the signal returned by the field equipment to verify whether it conforms to the interlocking logic.

[0054] The bag filter cleaning fan interlock protection test is only one of the desulfurization interlock tests. The signals received and sent by the test device include but are not limited to closing signals, tripping signals, temperature, flow, current, voltage, pressure, etc.

[0055] The logic of desulfurization interlock protection is pre-stored in the test device. Before testing, it is necessary to select the test sequence and configure the relevant parameters.

[0056] The entire test process not only verifies the interlocking logic software loop of the DCS system, but also verifies the interlocking hardware loop from the engineer station (DCS system) to the field equipment. There is no need to manually assign values ​​on the DCS configuration software. The signal is sent by the test device to simulate the interlocking trigger, which can truly realize the online simulation of the DCS system.

[0057] Example 2

[0058] like Figure 3 Different from Example 1, Example 2 connects the test device between the field equipment and the DCS control cabinet. The original field equipment is connected to the DCS control cabinet by cables. In this embodiment, the field equipment cables are first connected to the test device, and then connected from the test device to the DCS control cabinet, adding cables from the test device to the DCS cabinet. The test device in Example 2 is not used as a temporary device, but is permanently installed in the engineering project to test the important interlocks of desulfurization. In addition to testing work during the commissioning phase of the engineering project, the important interlocks of desulfurization can also be tested regularly to ensure the safe and reliable operation of the desulfurization system.

[0059] The field equipment is connected to the test device through hard wiring / communication, the test device is connected to the DCS control cabinet through hard wiring / communication, and the DCS control cabinet is connected to the engineer station through communication. The communication connection generally uses a network cable.

[0060] Important interlocks include induced draft fan interlock, outlet flue gas flow interlock, ash hopper level interlock, chute fluidizing fan interlock, high-pressure water pump interlock, etc.

[0061] The test process is similar to the test process in the embodiment, except that the field equipment signal first reaches the test device, and then from the test device to the DCS control cabinet, which will not be repeated.

[0062] This embodiment is a technical solution for testing important interlocks. The test device is installed in the engineering project as a permanent device. The test device sends a signal to simulate the interlock triggering condition to verify the reliability of the interlock protection and ensure the safe and reliable operation of the desulfurization system.

[0063] Example 3

[0064] like Figure 4 The test system is installed as software in the engineer station computer. Both Example 1 and Example 2 have hardware test devices. The test system of this embodiment is only a software installed in the engineer station computer.

[0065] Taking the ash hopper material level interlocking desulfurization stop test as an example, the working process and method of the interlocking test system of the present invention are explained.

[0066] like Figure 5 , is the flow chart of the ash hopper material level interlock stop desulfurization test.

[0067] The test system first collects the parameters and status of the on-site equipment through the DCS control cabinet to ensure that the conditions for the interlock test are met. The test system collects the hopper high-high level signal, the hopper high-point level pressure, and the hopper low-point level pressure to meet the conditions for the interlock test: there is no high-high level signal, and the hopper high-point level pressure and the hopper low-point level pressure do not exceed the interlock threshold.

[0068] When the interlock test conditions are met, the test system sends a signal to trigger the interlock protection: the hopper high material level signal, and starts timing.

[0069] The test system also monitors the actual signal of the ash hopper high and high material level in real time. Because the interlock protection triggering duration is relatively long, up to 6 hours, the test system monitors the actual signal of the ash hopper high and high material level in real time to ensure that the interlock protection can be correctly triggered when an abnormality actually occurs in the desulfurization system.

[0070] The DCS system receives the high material level signal from the ash hopper and starts timing.

[0071] The test system sends out a high material level signal for the hopper for 6 hours. When the timing is up, the interlock protection is triggered. The test system sends out a high point material level pressure of 24Kpa for the hopper and a low point material level pressure of 28Kpa for the hopper.

[0072] The DCS system obtains that the ash hopper has a high material level for 6 hours, and the high point / low pressure level pressure of the ash hopper is higher than the interlocking threshold, and the DCS system triggers the desulfurization stop interlocking protection.

[0073] The DCS system sends a signal to trip the slaked lime electro-hydraulic gate valve, the DCS system sends a signal to close the pneumatic flow control valve, and the DCS system sends a signal to trip the high-pressure water pump.

[0074] The test system receives various signals to determine whether they are normal, such as whether the tripping signal of the slaked lime electro-hydraulic gate valve sent by the DCS system is the tripping signal of the slaked lime electro-hydraulic gate valve. In actual engineering, other equipment has tripped.

[0075] The test system records and saves the test data, and the test ends.

[0076] During the entire test process, if the test system determines that there is an abnormal state, the test process will be stopped and the abnormal situation will be output to inform the tester. In this embodiment, the abnormal information can be displayed on the computer screen of the engineer station.

[0077] The signal duration in this embodiment is 6 hours. In actual engineering project testing, in order to shorten the interlocking test time, a shorter time may be used instead, such as a few minutes.

[0078] The ash hopper level interlock desulfurization protection test is only one of the desulfurization interlock tests. Changes in other parameters will trigger the interlock desulfurization protection. The signals received and sent by the test system also include but are not limited to closing / opening, temperature, flow, current, voltage, pressure, etc.

[0079] The logic of desulfurization interlock protection is pre-stored in the test system software. Before testing, it is necessary to select the test sequence and configure the relevant parameters in the software operation interface.

[0080] In this embodiment, the valve closing signal and motor tripping signal sent by the DCS system do not ultimately reach the field equipment, because this embodiment takes the interlocking test after the normal operation of the desulfurization system as an example, and the test process in Example 1 is based on the interlocking test before the desulfurization system is put into operation. If the interlocking test is performed before the desulfurization system is put into operation, the valve closing signal and motor tripping signal sent by the DCS system in this embodiment will reach the field equipment, and the status signal of the field equipment will also be returned to the test system and the DCS system.

[0081] The test system of this embodiment is installed in the computer of the engineer station in the form of software, without the need for additional hardware, saving hardware costs compared to Embodiment 1 and Embodiment 2. In actual engineering projects, a separate computer can also be configured to install the test system software, independent of the computer of the engineer station, to improve the reliability of the test.

[0082] This embodiment completely relies on the test system software and has high requirements on the computer and software communication. In actual engineering projects, the test plan should be selected according to the engineering project requirements, test environment, etc.

[0083] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A desulfurization interlocking test system, characterized in that include: Field equipment, DCS control cabinet, test equipment, engineer station; The field device comprises at least two interlocking controlled devices A and B; The field equipment is connected to the DCS control cabinet by hard connection or communication through cables; the DCS control cabinet is connected to the test device by communication, and the test device is connected to the engineer station by communication; the engineer station is a terminal installed with DCS configuration software; The DCS control cabinet collects parameters and status of field equipment and sends the collected data to the test device; The test device determines whether the on-site equipment meets the interlock test conditions, and if so, sends a signal to trigger the interlock protection to the engineer station; The engineer station sends a control signal of device A to the test device, and the test device determines whether the control signal is normal. If normal, the control signal is output to the DCS control cabinet, and then output to device A to perform corresponding control to change the state of device A; The DCS control cabinet collects the parameters and status of the device A after the state is changed, and sends the collected data to the engineer station through the test device; The engineer station determines whether the status of device B is normal. If normal, it sends a control signal of device B to the test device. The test device determines whether the control signal is normal. If normal, it outputs the control signal to the DCS control cabinet, and then outputs it to device B to execute corresponding control to change the status of device B.

2. A desulfurization interlocking test system according to claim 1, characterized in that: The control signal includes a closing signal, a tripping signal, a temperature signal, a flow signal, a current signal, a voltage signal or a pressure signal.

3. A desulfurization interlocking test system according to claim 1, characterized in that: The equipment A and equipment B are bag-type dust removal fans, ash hoppers, chute fluidizing fans or high-pressure water pumps.

4. A desulfurization interlocking test system, characterized in that include: Field equipment, DCS control cabinet, test equipment, engineer station; The field device comprises at least two interlocking controlled devices A and B; The field equipment is connected to the test device by hard connection or communication through cables; the test device is connected to the DCS control cabinet by communication, and the DCS control cabinet is connected to the engineer station by communication; the engineer station is a terminal installed with DCS configuration software; The DCS control cabinet collects the parameters and status of the field equipment through the test device, and sends the collected data to the test device; The test device determines whether the on-site equipment meets the interlock test conditions, and if so, sends a signal to trigger the interlock protection to the engineer station; The engineer station sends a control signal of device A to the test device, and the test device determines whether the control signal is normal. If normal, the test device outputs the control signal to device A to perform corresponding control to change the state of device A; The DCS control cabinet collects the parameters and status of the device A after the state is changed, and sends the collected data to the engineer station; The engineer station determines whether the status of device B is normal. If normal, it sends a control signal of device B to the test device. The test device determines whether the control signal is normal. If normal, it outputs the control signal to device B to perform corresponding control to change the status of device B.

5. A desulfurization interlocking test system according to claim 4, characterized in that: The control signal includes a closing signal, a tripping signal, a temperature signal, a flow signal, a current signal, a voltage signal or a pressure signal.

6. A desulfurization interlocking test system according to claim 4, characterized in that: The equipment A and equipment B are bag-type dust removal fans, ash hoppers, chute fluidizing fans or high-pressure water pumps.

7. A desulfurization interlocking test system, characterized in that include: Field equipment, DCS control cabinet, test equipment, engineer station; The field device comprises at least two interlocking controlled devices A and B; The field equipment is connected to the DCS control cabinet by hard connection or communication through cables; the DCS control cabinet is connected to the test device by communication, and the test device is connected to the engineer station by communication; the engineer station is a terminal installed with DCS configuration software; the test device is installed in the terminal in the form of software; The DCS control cabinet collects parameters and status of field equipment and sends the collected data to the test device; The test device determines whether the on-site equipment meets the interlock test conditions, and if so, sends a signal to trigger the interlock protection to the engineer station; The engineer station sends a control signal of device A to the test device, and the test device determines whether the control signal is normal. If normal, the control signal is output to the DCS control cabinet, and then output to device A to perform corresponding control to change the state of device A; The DCS control cabinet collects the parameters and status of the device A after the state is changed, and sends the collected data to the engineer station through the test device; The engineer station determines whether the status of device B is normal. If normal, it sends a control signal of device B to the test device. The test device determines whether the control signal is normal. If normal, it outputs the control signal to the DCS control cabinet, and then outputs it to device B to execute corresponding control to change the status of device B.

8. A desulfurization interlocking test system according to claim 7, characterized in that: The control signal includes a closing signal, a tripping signal, a temperature signal, a flow signal, a current signal, a voltage signal or a pressure signal.

9. A desulfurization interlocking test system according to claim 7, characterized in that: The equipment A and equipment B are bag-type dust removal fans, ash hoppers, chute fluidizing fans or high-pressure water pumps.

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