Sludge incineration flue gas emission up-to-standard control system and method

Abstract

The invention discloses a sludge incineration flue gas emission up-to-standard control system and method, and belongs to the technical field of sludge incineration. According to the system and the method, a water softener for preparing soft water is configured so as to feed the soft water into a soft water storage tank; the soft water is supplied to a NaOH blending tank and a water supplementing pipeline of a wet tower through the soft water storage tank, and a NaOH solution is fed into the wet tower through the NaOH blending tank; an open channel is connected to a circulating water outlet pipeline of the wet tower, and an original PH meter of the wet tower is refitted to the open channel; the chimney exhaust of the wet tower is collected in real time through a CMES data sampling module; continuous sampling is performed on the collected working condition data every n seconds through the PLC; an hour mean value of the sum of the m samples is calculated; the PLC is in communication connection with the upper computer and triggers the upper computer to give an alarm, and the PLC controls the sludge incineration system matched with the wet tower to stop sludge feeding, so that continuous and stable operation of the wet tower is achieved, the scale phenomenon is obviously improved, the PH value is controlled to be stable, and therefore the effect that flue gas emission is completelycontrollable is achieved.

Description

technical field [0001] The invention belongs to the technical field of sludge incineration, and in particular relates to a control system and method for controlling flue gas emission from sludge incineration. Background technique [0002] The flue gas produced after sludge incineration mainly contains SO 2 , NO X , HCl, HF and other main acid gases, the flue gas needs to enter the wet tower (also known as the wet desulfurization absorption tower) and then use sodium hydroxide solution for desulfurization and then discharge up to the standard. [0003] When the wet tower is working normally, the wet tower is mainly divided into an absorption section and a cooling and dehumidification section. NaOH solution is added to the absorption section and the NaOH solution needs to be formed in the NaOH conditioning tank in advance, while the cooling and dehumidification section needs to pass through the water supply pipeline Add reclaimed water (also known as recycled water), the exi...

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Problems solved by technology

[0004] (1) Wet towers add reclaimed water, add NaOH solution to reclaimed water, and then use wet circulation pump to spray and wash the flue gas; the existing problem is: the addition of reclaimed water makes wet spraying The system nozzles and auxiliary pipes are seriously fouled and blocked, which seriously affects the desulfurization effect

[0006] ①Pipeline measurement method Due to the small diameter of the pipeline and the design of the pipeline with many valves and many pipeline elbows, the sediment formed by the calcium and magnesium cations contained in the slurry is easy to be alluvial at the valves and elbows, resulting in pipeline blockage;

[0007] ②The glass electrode of the pH meter is prone to scaling, which affects the measurement accuracy of the pH value, resulting in deviations in the pH value, and cannot perform real-time pH control, which affects the desulfurization rate;

[0008] ③Because the pH meter is directly inserted into the pipeline, the erosion of the glass electrode by the slurry will cause the electrode to wear and affect its service life and measurement accuracy;

[0009] ④ The outlet pressure of the circulating pump is maintained at about 0.2Mpa, which leads to the fast liquid flow rate in the sampling pipeline, the thin "permeable membrane" of the glass electrode of the pH meter probe and the erosion and wear of the crystallized scale particles, and the glass electrode is easily damaged. In general, the service life of glass electrodes is less than 3 months

[0010] (3) The flue gas emission index of the wet process tower can only display real-time values ​​and historical trends. The problem is that if the flue gas index is too high, it is necessary to artificially stop the equipment (judged based on experience), which is highly subjective

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