JPH02284201A - Process abnormality emergency stop treatment device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of wrong judgement or misoperation at the time of emergency by providing an emergency primary processing means which executes emergency processing after making a process state after emergency shutdown operate to a safe direction. CONSTITUTION:For instance when the pressure of fuel becomes below a lower limit value in a combustion equipment (the pressure is detected by a pressure detector 5), or when the flame of a combustion furnace 4 quenches (the flame is detected by a flame detector 6), the emergency stop circuit 7 of an emergency shutdown system is operated by these detection signals, and a shutdown valve 2 is closed, and the combustion furnace 4 is emergency-stopped. Next, when two signals among the operation signal 8 of the emergency stop circuit 7, a combustion furnace stop signal (flame quench signal) 9 and an external part input signal (manual input) are inputted to a CPU 12, an emergency action circuit 20 is operated, and a control valve 3 is closed, and emergency primary action operation to make the process state operate toward the safe direction is executed. Thus, the occurrence of the wrong judgment and the misoperation can be prevented at the time the emergency.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an emergency stop treatment device for abnormalities in a process, and more particularly, to a treatment device for early detection of an abnormal state in a process and an emergency shutdown of a plant. .

(Prior Art) In recent years, plant operations in chemical plants and the like have become increasingly sophisticated, and in response to demands for rationalization and labor savings, fewer workers are required to operate the plants. For this reason, plant operation monitoring is also shifting from operation monitoring based on panel displays (referred to as panel operation) to operation monitoring centered on CRT consoles of computers equipped with distributed instrumentation systems (referred to as CRT operation). be.

BACKGROUND ART Conventionally, in a chemical plant, when a plant abnormality occurs, an emergency stop (plant shutdown) is executed automatically or manually. This emergency situation and shutdown are carried out by operating and stopping the minimum necessary shutoff valves, rotating equipment, etc. to safely stop the plant.

After the plant is shut down, operators predict and judge the future operating status of the plant. An emergency device is in place to manually operate the II mode valve in a safe direction. In the panel operation system, the above-mentioned procedure is carried out manually by an operator before each i-segment.

On the other hand, in a CRT operation employing a distributed instrumentation system, an Etj clock is called up on the CRT screen and manual operation is performed.

(Problem to be Solved by the Invention) However, in the CRT operation described above, it is necessary to call the corresponding controller and manually operate the output of the corresponding controller to fully open or fully open (target value) in the safe direction of the process. Compared to the above-mentioned panel operation, this requires more time (due to the operator's ability to respond to abnormalities, response delays due to inexperience with the CRT operation, etc.), and since it is urgent, there is a risk of incorrect judgment or incorrect operation. However, there were problems in responding to emergencies.

An object of the present invention was to solve the above-mentioned conventional problems of CRT operation in a distributed instrumentation system, and to detect abnormal conditions in the process at an early stage, and to perform emergency shutdown of the plant and emergency after shutdown. An object of the present invention is to provide a device for automatically stopping abnormalities in a process.

(Means for Solving the Problems) The process abnormality emergency stop treatment device of the present invention takes in multiple types of process variables every predetermined sampling period,
Emergency stop: If these measured values exceed the preset upper or lower limit values for each process variable, or if an abnormal process status signal is input, the process protection device is activated to stop the process. When at least two types of signals among the emergency stop signal, process status abnormality signal, and external input signal are received, the emergency treatment device is activated to cause the process to prosper, and the process status after the stop is operated in a safe direction to cause an emergency situation. (2) Emergency primary treatment means for performing treatment.

(Example) Hereinafter, a process abnormality 51 and a stop treatment device according to the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a flowchart showing the operation of a process abnormality emergency stop treatment device in an embodiment of the present invention. In chemical plants and the like, process variables such as temperature, pressure, flow rate, liquid level, and rotational speed are set within predetermined ranges in order to operate the plant safely. In the present invention, these process variables are detected by a detector, and the detection signal is taken into the emergency stop device 11 (step 13).
.

If the process variable in the process exceeds the preset upper limit value or lower limit value (step 14), or if the process condition is abnormal (e.g. In the case of stop condition B) in which normal operation is impossible (step 15), the process protection device (circuit) is activated to perform an operation to emergency stop the process (step 17). Next, a process emergency stop signal, Process status abnormality signals and external input signals that can be input manually by the operator are sent to the central processing unit (
When any two of these input signals are received, an emergency treatment device (circuit) is activated to operate the process state in a safe direction after the process emergency stop. V5. Urgent equipment operations (for example, activation of a shutoff valve (fully closed or fully open), stopping of rotating equipment, etc.) are performed (step 18.19).

FIG. 2, FIG. 3, and FIG. 4 are schematic diagrams of the abnormal emergency shutdown treatment device of the present invention when applied to a combustion device.

Fuel is supplied from a conduit 1 through a shutoff valve 2 and a control valve (TCV) 3 to a combustion furnace 4, where combustion occurs.

If the fuel pressure drops below the lower limit value for some reason (pressure detected by pressure detector 5), or if the flame in combustion furnace 4 goes out (flame detected by flame detector 6), these detection signals When the stop device 11 is activated, the stop circuit 7 is activated, the shutoff valve 2 is closed, and the combustion furnace 4 is turned to V.
! , it comes to a sudden stop. Next, any two of the activation signal 8 of the emergency stop means 7, the combustion furnace stop signal (extinguishing signal) 9, and the external input signal (manual input) are CPtJ 1
2, the emergency treatment device 20 is activated to carry out an emergency next device operation that moves the process state of the combustion furnace 4 in a safe direction after the emergency shutdown, such as closing the control valve 3. be done.

(Effects of the Invention) As described above, according to the process abnormality emergency stop treatment device of the present invention, it is possible to prevent an operator from making a wrong judgment or erroneous operation in an emergency situation of a process.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the operation of the process abnormality emergency stop treatment device in one embodiment of the present invention, and FIG. An explanatory diagram of the configuration when the stop cup device is applied to a combustion device, Fig. 3 is a flowchart showing the operation of the emergency stop circuit, and Fig. 4 is a flowchart showing the operation of the emergency section 1 circuit. be. 7...Emergency stop circuit, 11...Emergency stop device, I2
...Central processing unit.

Claims (1)

[Claims] Multiple types of process variables are taken in every predetermined sampling period, and when these measured values exceed the upper or lower limit set in advance for each process variable, or when an abnormal process status signal is input. an emergency stop means for urgently stopping the process by activating a process protection device;
When at least two types of signals among an emergency stop signal, a process state abnormality signal, and an external input signal are received, an emergency treatment device is activated to operate the process state after the process emergency stop in a safe direction and perform emergency treatment. An abnormality emergency stop treatment device for a process, comprising a primary treatment means.