Yadian Xinbao #7 Furnace DCS System Transformation

Abstract: Yadian Xinbao #7 furnace DCS system transformation information is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. 1 Overview Yadian Xinbao #7 furnace model is HG220/100HM11, rated steam flow 220T/H, rated main steam pressure 9.81Mpa, rated main steam temperature 540℃. In order to improve the automation degree of boiler control and reduce the workload of operators, Yadian Xinbao Company adopts Xinhua. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on the transformation of the DCS system of Yadian Xinbao #7 furnace. 1 Overview Yadian Xinbao #7 furnace model is HG220/100—HM11, rated steam flow 220T/H, rated main steam pressure 9.81Mpa, rated main steam temperature 540℃. In order to improve the automation degree of boiler control and reduce the workload of operators, Yadian Xinbao Co., Ltd. adopted Xinhua XDPS-400 distributed control system to carry out DCS transformation of #7 boiler, with functions covering DAS, MCS, SCS, and FSSS. DAS includes signal acquisition and processing, flow chart display, trend display, alarm display, group display, list display, report record printing, historical data collection, SOE record reproduction, accident recall, etc.; MCS includes heat load control, drum water level control, Main steam temperature control and furnace negative pressure control; SCS includes control and interlocking of auxiliary machines such as induced draft fan, blower, powder discharger, coal mill, and electric door; FSSS is responsible for furnace safety monitoring. 2. MCS input situation after transformation After DCS transformation, MCS investment becomes much easier compared with traditional control instruments, and the control strategy can be modified online and you can play it as you like. This is also the outstanding aspect of XDPS-400 distributed control system. 2.1 Drum water level control system The steam drum water level control system still adopts the traditional three-impulse control system. Since the control object is a fast response link, the input of the automatic control system is much easier, so the main work is concentrated on the optimization of PID parameters The current situation is that when the automatic control system is put into operation, the change range of the water level of the steam drum is within 15mm, which can meet the requirements of boiler operation. 2.2 Main steam temperature control system As we all know, the main steam temperature as the control object is an inertial link with a large delay, and it is not easy to keep the temperature within the required range by relying on the traditional PID control of the water injection volume alone. The main steam temperature control of Yadian Xinbao #7 furnace is designed to be two-stage water spray to reduce temperature, but its second-stage water spray is not used, and only one-stage water spray is used to control the main steam temperature. In this way, when the amount of water spray changes, it takes a longer time to change the temperature of the main steam, which makes it more difficult to invest in the automatic control system for the temperature of the main steam. In view of the current situation, the automatic adjustment of the main steam temperature also requires the use of PID function blocks. Obviously, it is difficult to maintain the main steam temperature within the required range and adapt to load changes only by PID control, no matter how the P and I parameters match. It is also weak, and the automatic control system is prone to vibration. The method to solve the problem starts with adding feedforward. The traditional feedforward is usually to add appropriate feedforward according to the influence of disturbance factors on the system, but for the main steam temperature, there are many disturbance factors, and in different disturbance effects. The dynamic response of the lower system is also different. From another point of view, when any disturbance occurs, although the temperature of the main steam has not changed significantly, it will definitely show a trend of change. Based on this point, the feedforward effect described below was added after a long period of observation and repeated experiments when the main steam temperature of Yadian Xinbao #7 furnace was automatically adjusted. The current value of the average value of the main steam temperature minus the value 30 seconds ago can reflect the change range of the main steam temperature within 30 seconds. Increase the opening of the valve by 8%. When the increase is less than 0°C and hold for more than 2 seconds, remove the 8% increase in the opening of the warm water valve. Conversely, when the reduction of the main steam temperature is greater than 0.5°C and maintained for more than 2 seconds, the opening of the desuperheating water valve will be reduced by 8%. Opening plus. It should be reminded that the above feedforward is added to the PID output of the sub-tune, not to the FF input of the PID function block. Judging from the actual input effect, the above feedforward effect plays a major role in the main steam temperature control system, while the PID adjustment only plays the role of auxiliary adjustment, and the adjustment effect can neither be too strong nor too weak. The current PID regulation loop still adopts cascade regulation, one main regulation with two secondary regulation, the process variable of main regulation is the average value of main steam temperature, and the leading temperature of sub regulation is the outlet temperature of secondary desuperheater. Due to the combustion of the boiler, the left and right sides are heated unevenly, and there is always a temperature deviation before the steam enters the final superheated steam mixing header. In order to make the left and right water spray valves act synchronously and the opening deviation will not be too large, the average value of the outlet temperature of the left and right secondary desuperheaters is taken as the leading temperature of the two sub-adjustments.

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