Hybrid control method for drum water level system of coal-fired boiler
A technology of drum water level and coal-fired boiler, applied in the field of automation, can solve the problems of poor control performance, increased production cost, backwardness, etc.
Inactive Publication Date: 2011-08-31
HANGZHOU DIANZI UNIV
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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 drum water level 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 very unsatisfactory.
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0052] Take the process control of drum water level in circulating fluidized bed boiler system as an example:
[0053] Here, the control of the steam drum water level circuit of the system is described as an example. Drum water level is not only affected by the amount of desuperheating water in the desuperheater, but also by fuel flow, air flow and steam flow. Water intake is used as the adjustment method, and the rest of the effects are regarded as uncertain factors.
[0054] (1) Establish the drum water level process model of the circulating fluidized bed boiler system.
[0055] The real-time process steam drum water level operation data is collected by the data acquisition device, and the collected real-time process steam drum water level operation data is used as a data-driven sample set, and the least square method is used to reason, and the steam drum water level process in the form of a discrete difference equation based on the least square method is established. Mode...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a hybrid control method for a drum water level system of a coal-fired boiler, which is characterized by firstly establishing a process model based on the real-time process data of the drum water level of the coal-fired boiler and digging out the basic process characteristics; then establishing a proportional control circuit based on the process model; and finally implementing predictive PI control on proportional control and the drum water level 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 productionperformance index. The control technology provided by the invention can effectively reduce the error between the technological parameters of the ideal drum water level and the actual drum water level, 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 drum water level 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 control (P) of a coal-fired boiler drum water level system. 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 boiler drum water level system: the change of steam load causes the change of steam pressure and superheated steam temperature, and also the change of steam drum water level; the change of fuel quantity directly affects the steam pressure, superheated steam temperature,...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): F22D5/00
Inventor 薛安克张日东王建中吴锋王春林
Owner HANGZHOU DIANZI UNIV