Abstract: the electrical xin Po # 7 boiler DCS system information produced by excellent flow meter
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1 overview the electricity xin Po # 7 furnace model for HG220/100 hm11, rated steam flow of 220 t/H, main steam pressure rating.
81 mpa, rated main steam temperature of 540 ℃.
In order to improve the automation degree of boiler control and reduce the workload of the operators, the electricity xin bao company by xinhua.
More flow meter manufacturers choose model price quote you are welcome to inquire, here is the electricity xin Po # 7 boiler DCS system the article details.
1 overview the electricity xin Po # 7 furnace model for HG220/100 & ndash;
HM11, rated steam flow of 220 t/H, main steam pressure rating.
81 mpa, rated main steam temperature of 540 ℃.
In order to improve the automation degree of boiler control and reduce the workload of the operators, the electricity the xinhua XDPS - xin bao company
400 # 7 furnace for distributed control system DCS transformation, includes the DAS, MCS, SCS, FSSS. Whether
DAS including signal collection and processing, chart display, trend display, alarm, grouping, view display, report printing, historical data collection, SOE records reappearance, accident recall, etc. ;
The MCS includes heat load control, steam drum water level control, the main steam temperature control, hearth negative pressure control;
SCS including induced draft fan, blower, row of powder machine, mill and other auxiliary machinery and electric door control and interlock;
FSSS is responsible for the furnace whether security monitoring.
2 MCS input after DCS after the reform, and compared with the traditional control instrument of MCS input becomes much more relaxed, the control strategy can modify online and let you play, which is also XDPS -
400 outstanding aspect of distributed control system.
1 steam drum water level of steam drum water level control system control system still adopts the traditional three impulse control system, as the control object is a rapid response, automatic control system of the investment would be easier, so the main work is focused on the optimization of PID parameters, the present situation is automatic control system input, the change range of steam drum water level within the 15 mm, can satisfy the requirement of boiler operation.
2 main steam temperature control system is well known, as the main steam temperature control object is a big delay inertial link, traditional PID control of the water spray quantity alone keep the temperature within the scope of the requirements will not be easy.
And the electricity xin Po # 7 boiler main steam temperature control, although the design for the two levels of reduction temperature, but the secondary water need not, only water level to control the main steam temperature.
So when the water quantity changes, you need more time to make the main steam temperature changes, so that the main steam temperature automatic control system of the investment becomes more difficult.
In view of the current situation, main steam temperature automatic adjustment also need to use the PID function block, apparently only by whatever P and I parameters matching, PID control is difficult to keep the main steam temperature is within the scope of the requirements and to adapt to changes in load ability is weaker, the automatic control system to oscillate.
The method to solve the problem first start from adding feedforward, traditional feedforward is often according to the size of the disturbance factors impact on the system and add the appropriate feedforward, but the disturbance factors for main steam temperature is more, and the dynamic response of the system under different disturbances are also different.
From another point of view, when there is an any disturbance, while the main steam temperature has no obvious change, but it will show the trend.
Based on this, electrical xin Po # 7 in the furnace of the main steam temperature automatic adjustment, after a long time observation and repeated experiments, joined the feedforward action as described below.
Main steam temperature of the average value of the current value of minus 30 seconds ago, this can reflect the change range of main steam temperature for 30 seconds, when the main steam temperature rises above zero.
5 ℃ and keep more than 2 seconds, the hot water valve opening is increased by 8%, when the increase rate is less than 0 ℃ and keep more than 2 seconds, will increase 8% of the valve opening of warm water to remove.
On the other hand, when the main steam temperature of reduction of greater than zero.
5 ℃ and keep more than 2 seconds, the opening of warm water valves reduce 8%, reduced when the amplitude is less than 0 ℃ and keep more than 2 seconds, will be cut in front of the valve opening plus 8% of warm water.
Need to special remind is the feedforward is combined with vice tuning PID output, rather than on the FF input terminal of the PID function block.
From the point of actual effect, the feedforward action in the main steam temperature control system has played a major role, and the PID only have the effect of secondary regulation, regulation can neither too strong nor too weak.
Now still use a cascade PID control loop, a tone with two deputy, advocate the average of the main steam temperature process variables, deputy of the outlet temperature of the temperature of the secondary attemperator guide before.
Because boiler burning, the left and right side of the balance of steam before to mix level at the end of the superheated steam header, always there temperature deviation.
In order to synchronize the around hydraulic valve action and deviation from the opening is too large, the outlet temperature of the secondary attemperator averaged around as two vice temperature adjustable guide before.
Now advocate tone parameters for: Kp = 0.
8, Ti = 150, two vice are: Kp = 0.
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