Hybrid control method for superheat steam temperature system of coal-fired boiler
A technology of superheated steam and coal-fired boilers, applied in the field of automation, can solve problems such as poor control performance, increased production costs, and backwardness
Inactive Publication Date: 2011-09-07
HANGZHOU DIANZI UNIV
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Problems solved by technology
These unfavorable factors lead to low precision of traditional control methods, which further lead to instability of subsequent production control parameters, low product qualification rate, and low boiler efficiency
At present, the superheated steam temperature control of coal-fired boilers in the actual industry basically adopts traditional simple control methods, and the control parameters are completely dependent on the experience of technicians, which increases the production cost and the control effect is not ideal.
my country's coal-fired boiler control and optimization technology is relatively backward, with high energy consumption, poor control performance, and low degree of automation. It is difficult to meet the needs of energy conservation, emission reduction, and indirect environmental protection. One of the direct influencing factors is coal combustion. Boiler System Control Scheme Questions
Method used
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[0053] Take the superheated steam temperature process control of circulating fluidized bed boiler system as an example:
[0054] Here, the control of the superheated steam temperature loop of the system is described as an example. The superheated steam temperature is not only affected by the desuperheating water flow, but also by the fuel flow, air intake flow and steam flow. The adjustment method adopts the flow rate of desuperheating water, and the rest of the effects are regarded as uncertain factors.
[0055] (1) Establish the superheated steam temperature process model of the circulating fluidized bed boiler system.
[0056] The real-time process superheated steam temperature operation data is collected through the data acquisition device, and the collected real-time process superheated steam temperature operation data is used as a data-driven sample set, and the least square method is used to reason, and the superheated steam temperature process in the form of a discret...
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The invention relates to a hybrid control method for a superheat steam temperature system of a coal-fired boiler, which is characterized by firstly establishing a process model based on the real-time process data of the superheat steam temperature of the coal-fired boiler and digging out the basic process characteristics; then establishing a proportional-integral (PI) control circuit based on theprocess model; and finally implementing predictive PI control on PI control and the superheat steam temperature object of the coal-fired boiler wholly by computing the parameters of a predictive PI controller. The method of the invention makes up for the deficiency of traditional control, effectively facilitates the design of the controller, ensures the control performance to be elevated and simultaneously meets the given production performance index. The control technology provided by the invention can effectively reduce the error between the technological parameters of the ideal superheat steam temperature and the actual superheat steam temperature, further make up for the deficiency of the traditional controller and simultaneously ensure the control device to operate in the optimum state so as to ensure the technological parameter of the superheat steam temperature in the production process to be strictly controlled.
Description
technical field [0001] The invention belongs to the technical field of automation and relates to a hybrid control method of predictive proportional integral control (predictive PI) and proportional integral control (PI) of a superheated steam temperature system of a coal-fired boiler. Background technique [0002] Coal-fired boiler is an important power equipment in the power production department. Its requirement is to supply qualified steam so that the steam output of coal-fired boiler can meet the needs of the load. For this reason, each main process parameter of the production process must be strictly controlled. However, coal-fired boiler equipment is a complex controlled object, and the input and output are interrelated. For the superheated steam temperature system: the change of steam load causes the change of steam pressure and superheated steam temperature; the change of fuel quantity directly affects the steam pressure, the change of superheated steam temperature,...
Claims
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IPC IPC(8): G05B13/04F22G5/20
Inventor 张日东张乐薛安克葛铭邹洪波
Owner HANGZHOU DIANZI UNIV