A kind of flue fly ash constant velocity sampling system and control method based on bp neural network

Abstract

The invention discloses a flue fly ash constant-speed sampling device as well as a flue fly ash constant-speed sampling system based on a BP neural network and a control method, and belongs to the field of detection of flue fly ash. The flue fly ash constant-speed sampling device comprises a sampling nozzle, a sampling pipe, a cyclone separator, a sampling bottle, an ejector pipe, an adjusting nozzle and an exhaustion pipe. The flue fly ash constant-speed sampling system based on the BP neural network comprises a sampling device, a PLC controller, an executor, a pressure sensor and a BP neural network module. The control method of the flue fly ash constant-speed sampling system based on the BP neural network is characterized in that the flue fly ash constant-speed sampling is realized based on the BP neural network, and flue static pressure approach to the actual pressure is predicted by using mass data which are measured in real time, so that the problem of hysteresis quality of the constant-speed sampling is solved, the sampling accuracy is improved, and the advantages of small calculation errors, high data processing ability and low design cost are achieved.

Description

technical field [0001] The invention relates to the field of flue fly ash detection, in particular to a flue fly ash constant velocity sampler, a flue fly ash constant velocity sampling system and a control method based on a BP neural network. Background technique [0002] For modern thermal power generation units, the carbon content of fly ash is an important indicator reflecting the combustion efficiency of coal-fired boilers in thermal power plants. Accurate and real-time monitoring of carbon content in fly ash is conducive to improving the level of boiler combustion control and reducing power generation costs , improve the economy of unit operation. At present, the flue ash sampling method of the combustion boiler in the power plant adopts the static pressure balance constant velocity fly ash sampling method, because when the sampling speed is equal to the flow rate of the flue fly ash, the sampling is representative, which is beneficial to analyze the combustion perform...

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem that the opening of the valve for adjusting the static pressure at the sampling nozzle lags behind the static pressure change at the sampling point during constant-velocity fly ash sampling, the calculation error of the carbon content of the fly ash is large, and the data processing ability is not strong. And the problem that sampling accuracy is not high, provide a kind of flue fly ash constant velocity sampler and flue fly ash constant velocity sampling system and control method based on BP neural network; The present invention can effectively solve constant velocity sampling hysteresis problem, It has the characteristics of small calculation error and high efficiency

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