An automatic control system and method

Abstract

The present invention relates to an automatic control system and method, the device includes doffing tube, at least one material level sensor, digital-to-analog conversion control box, decentralized control system DCS, feeding actuator, feeder and boiler sensor, the material level The sensor is placed on the outside of the tube wall of the doffing tube, and is connected with the digital-analog conversion control box, and the digital-analog conversion control box is connected with the distributed control system DCS, and the distributed control system DCS is respectively connected with the feeding actuator, the feeding The feeder is connected with the boiler sensor, the feeding actuator is placed at the upper end of the doffing tube, and the feeder is placed at the lower end of the doffing tube. Compared with the prior art, the present invention can sense the material level, automatically adjust the feeding speed and discharging speed, control the material level of the doffing tube, reduce energy consumption, reduce potential safety hazards, and improve combustion efficiency.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to an automatic control system and method. Background technique [0002] Bagasse is an accessory of sugarcane sugar making, and is the energy source for boiler combustion of most sugarcane sugar making enterprises; there are mainly following deficiencies in the prior art: [0003] 1. The bagasse enters the furnace through the feeder, and does not stay and accumulate in the doffing tube. There are gaps in the doffing tube, and a large amount of cold air directly enters the furnace through the doffing tube, which reduces the thermal effect of the furnace; [0004] 2. The cold air directly enters the furnace. Affected by thermal expansion and contraction, the positive and negative pressure of the furnace changes frequently, and the oxygen content of the boiler changes frequently. It is easy to cause incomplete combustion of bagasse, the energy cannot be effectively utilized, ...

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Problems solved by technology

[0003] 1. The bagasse enters the furnace through the feeder, and does not stay and accumulate in the doffing tube. There are gaps in the doffing tube, and a large amount of cold air directly enters the furnace through the doffing tube, which reduces the thermal effect of the furnace;

[0004] 2. The cold air directly enters the furnace. Affected by thermal expansion and contraction, the positive and negative pressure of the furnace changes frequently, and the oxygen content of the boiler changes frequently. It is easy to cause incomplete combustion of bagasse, the energy cannot be effectively utilized, and the difficulty of processing incomplete combustion is increased. ;

[0005] 3. Bagasse feeding is not uniform, and the boiler often has slag spraying and deflagration, which brings fire hazards to safety production, and deflagration causes bagasse ash to fly randomly and pollute the working environment;

[0006] 4. Due to the unstable negative pressure of the furnace, the boiler induced wind and the blast air volume are unstable, and the heat energy of the flue gas cannot be effectively utilized, so that the economizer and the air preheater cannot achieve the best heating effect, and the temperature of the boiler exhaust gas Without better control, high energy consumption and certain environmental pollution; unstable air induction and blowing, and large power loss of fan motors

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