Full-automatic boiler feedwater oxygenating device and full-automatic boiler feedwater oxygenating method

Abstract

The invention discloses a full-automatic boiler feedwater oxygenating device, which comprises a PLC (programmable logic controller), a low detection device, a dissolved oxygen detection device, an oxidation-reduction potential detection device, a hydrogen conductive detection device and a flow controller. The invention further discloses a method of using the full-automatic boiler feedwater oxygenating device to oxygenate feedwater. By means of feedwater composite oxygenating treatment, feedwater is subjected to trace oxygenating with feewater flow serving as feed forward to assist in proportion-integration-differentiation control through the full-intelligent oxygenating control technique, so that the structure and form of a water-gas contact interface oxide film can be changed, the oxide film can be more compact and firm, and FAC (flow accelerated corrosion) of a water feeding system can be relieved or eliminated. Accordingly, the problem of flow accelerated corrosion of the water feeding system can be solved, the service life of equipment is prolonged, energy is saved while consumption is reduced, and economic and social benefits can be improved.

Description

technical field [0001] The invention belongs to the technical field of electric power and power engineering control, and in particular relates to a fully automatic boiler feed water oxygenation device and an oxygenation method. Background technique [0002] The structure of the existing boiler feed water and drainage system is as follows: figure 1 As shown, part of the steam from the steam turbine is diverted to the final reheater for reuse after being heated, and the rest of the gas-liquid mixture from the steam turbine is condensed through the condenser, and then the condensed water, hydrophobic water and external supply water are sent through the condensate pump To the coagulation bed, the circulating water softened by the coagulation bed enters the low-pressure water supply system for preliminary low-temperature heating, and then is treated by the deaerator, and part of the oxygen and steam are discharged. After being heated by the coal burner and the water-cooled wall ...

AI Technical Summary

Problems solved by technology

The feed water of large-capacity super (super) critical units in thermal power plants is generally operated under the condition of full volatilization treatment (AVT(R) and AVT(O)). Long-term operation causes the oxide film on the surface of the heating surface material to be loose, resulting in accelerated corrosion of the water flow in the water supply system ( FAC) is serious, and the overall Fe content of the water vapor system is high, which eventually leads to the following problems: poor water vapor cleanliness, clogged orifice valves, early fouling sites, high furnace tube fouling rate, high pressure heater and boiler pressure difference and rising speed Fast, short boiler chemical cleaning cycle, large amount of iron oxide scale deposited on the high-pressure cylinder of the steam turbine

However, since the above-mentioned device only controls the oxygenation flow rate based on the two signals of the feedwater flow signal and the dissolved oxygen concentration signal at the inlet of the economizer, there are few information sampling points, and it is impossible to comprehensively control the entire system. Unstable traffic

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