Purification Technology Edition: Daily Question [2018-1-18]
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What are the characteristics of stepwise adjustment? What are the characteristics of split-range control? The purpose of implementing split-range control is to expand the adjustable range in order to meet the specific requirements of a particular process. It can be modified to improve quality and enhance the working conditions of the control valve ； It meets the requirements for low flow rates during startup and shutdown, as well as high flow rates during production, ensuring good control quality in all situations ； Ensure stability and safety under normal operation as well as in emergency conditions.
A distributed control system, also known as a fully distributed control system, is a distributed direct control device centered around microprocessors. Its control functions are decentralized (formed into subsystems centered around microprocessors), while management is centralized (handled by computers). Compared with centralized control systems, it has the following characteristics: 1. High reliability (i.e., risk dispersion). Microcomputers based on microprocessors are more reliable than small and medium-sized computers; even if a part of the system fails, it does not affect the overall operation, and the various subsystems can still carry out independent control when managing computer failures. 2. The system has a reasonable structure (i.e., a decentralized structure). The input and output data of the system are pre-processed or selected by subsystems, reducing the amount of data transmitted, thereby lowering the load on the microcomputer and increasing the control speed. 3. With reduced information volume, programming becomes simpler, and modifications and changes are much easier to make. 4. Due to the decentralized control functions, the reliability of subsystems improves, which allows for lower requirements regarding management computers as well as microcomputers
The characteristic of split-range control is that the output of one controller simultaneously controls several control valves operating in different ranges
The characteristic of a split-range control system is that the output of one regulator controls several control valves with different operating ranges simultaneously
The characteristic of a multi-stage control system is that the output of one controller simultaneously controls several control valves operating within different ranges.
The characteristic of a split-range control system is that the output of one regulator controls several control valves operating in different ranges; for example, one control valve operates in the range of 20–59 kPa, while another operates in the range of 59–99 kPa.
a) Improve the regulation quality and the operating conditions of the control valve. b) Meet the requirements for low flow rates during startup and shutdown, as well as high flow rates during normal operation, ensuring good control quality in both cases. c) Meet stability and safety requirements under normal operation and accident conditions.
The purpose of setting step regulation is to expand the adjustable range and meet the special requirements of the process. It can be modified to improve quality and enhance the working conditions of the control valve ； It meets the requirements for low flow rates during startup and shutdown, as well as high flow rates during production, ensuring good control quality in all situations ； Meet normal production and accident scenarios
What are the characteristics of split-range control? The purpose of implementing split-range control is to expand the adjustable range in order to meet the specific requirements of a particular process. It can be modified to improve quality and enhance the working conditions of the control valve ； It meets the requirements for low flow rates during startup and shutdown, as well as high flow rates during production, ensuring good control quality in all situations ； Ensure stability and safety under normal operation as well as in emergency conditions
What are the characteristics of split-range control? The purpose of implementing split-range control is to expand the adjustable range in order to meet the specific requirements of a particular process. It can be modified to improve quality and enhance the working conditions of the control valve ； It meets the requirements for low flow rates during startup and shutdown, as well as high flow rates during production, ensuring good control quality in all situations ； Ensure stability and safety under normal operation as well as in emergency conditions
What are the characteristics of split-range control? The purpose of implementing split-range control is to expand the adjustable range in order to meet the specific requirements of a particular process. It can be modified to improve quality and enhance the working conditions of the control valve ； It meets the requirements for low flow rates during startup and shutdown, as well as high flow rates during production, ensuring good control quality in all situations ； Ensure stability and safety under normal operation as well as in emergency conditions.