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1、Faintness controller of burning boilerThe text which study series coal powder burning boilers control a scheme, presented heat load system level modules control, and enter the circuit vague courting superior control, simulation results confirm the feasibility of the scheme. Currently, many large dom
2、estic plants have adopted computer fire control, and the effect is very good. However, because of our electric energy is very tense, there were many small plants in the pot guarding the plant, especially t-he automatic control system coal powder boilers, and have not been properly addressed. The rea
3、son is Coal powder boilers factors to be charged more, strong internal link, external disturbances are frequent and has distinct characteristics and nonlinear characteristics purely lag for automatic control system for high security. Thus the system is a category difficult to control. Although many
4、smallpower plant boilers designed conventional instrumentation system, but did not achieve the desired purpose, and most still use manual control. This is because conventional instruments can only achieve a salt sinks control, not con trolled process changes, not the entire boiler system coordinatio
5、n and control. Development of the mid-1970s .To obscure control theory, Coal powder boiler combustion control system has good performance and achieve giant burning boilers ambiguous control system. Boilers operating system is an important way to achieve automation. Model steam boiler steam drum boil
6、er combustion syst-ems burning pressure is the main target was the transfer of control, causing steam pressure changes a number of factors, such as fuel volume, enter volume, to water, steam flow and the various changes in the nature burn. It is the m-ain disturbance fuel volume change (known as the
7、 three), and steam flow changes (known as the three). Changes in the volume of fuel, ignoring some minor factors, the pressure steam boilers similar to the dynamics of the target. Bonus Point forinertial links with the chain link. From the actual process gas pr-essure for the transmission of a certa
8、in lag, the time lag in net .We can burn between about 1 s2s; mathematical models for the systemG (S)=P(S)/M(S)=Ke/ (TS (TZS+1) (1)Type of P, T pressure steam, and one time constants; a delay of one to powder one time, K ratio factor. This mathematical model, it is only a similar time constants diff
9、icult to identify the precise measurements, changes in operating conditions and the presence of system equipment error and other factors will cause the parameters, constant changes, such changes resulting mathematical model and the actual syste-m. Often do not match to ensure better control over per
10、formance, the use ofvague control is of great significance.Control scheme, boiler combustion system is a complex of three export targets, as seen in figure 1, but exists between the volume of Figure 1 targets ex-pressed by the actual in depth study，It found that : the main chamber pressur-e from the
11、 wind and enter the film, and the volume of its other effects are smallit can be fuel volume, Steam chamber pressure as the pressure brought fans ofthe former fed single circuit control Unification. In addition, the plan is to ensure access to the traditional economic practices combustion boilers th
12、at fall through a synthesizing Calibration of gasblast wind of synthesizing. Departmentcited various constraints s methods as a result of the effect is not ideal C27, first as a means of economic control of the main temple burned Zr0 mutilated synthesizing checking device is expensive, life short; S
13、econdly, the longerthe time lag synthesizing signals when the load changes, the volume of coal mutations, synthesizing not timely response, maintained the original air blow volume will inevitably cause giant roast inadequate. Therefore, we do not adopt such an approach, but to use thermal efficiency
14、 than coal and wind between peaks identity to chamber temperature accused of using courting superior control, automatic search of the best wind than coal. So that the fuel can design for two inches as mutually independent and affiliated control systems that heat load control systems (to maintain ste
15、am pressure) roast economic control syste-m (PO With the best wind / coal than). The diagram showed in figure 1. Usedto control steam pressure on the chamber temperature control parameters for deputy to vapour pressure for control parameters string level control. In terms of timing, because chamber
16、temperature much more than vapour pressure advance, and inertia time constants are smaller. Advance .To the volume of coal toovercome system transition time, the volume of superlarge, the slow recovery of the parameters, such as poor quality control shortcomings, but also for people deputy circuit into disturbances (such as greenhouses, cited wind, chamber pressure, the volume of coal, coal, etc.) has a fairly strong anti-interference capability. Plans for China ha
