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Hydrochloric acid lamp base

2021-07-08View Original

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As observed in the chlor-alkali industry today, blockages in hydrogen lamps are related to low water content in the hydrogen; humidifying the hydrogen before it enters the lamp could be a solution – let’s discuss this.
Reply #22021-07-09
The raw hydrogen is delivered by the hydrogen compressor used in the chlorohydrogen treatment process to the main hydrogen pipeline; after being measured by a flow meter, it passes through shut-off valves, control valves, and isolation valves before reaching the bottom of the lamp head of the two-in-one graphite synthesis furnace. The hydrogen pressure is regulated by a hydrogen pressure automatic control valve, and the vented hydrogen is released after passing through a hydrogen vent flame arrester. The raw chlorine gas is fed into the chlorine buffer tank by a chlorine compressor used in the chlorohydrin treatment process, where it mixes with the residual chlorine from the liquid chlorine section. After being buffered and pressure-stabilized, the chlorine gas enters the chlorine pipeline and, via stop valves, control valves, and isolation valves, reaches the burner of the synthesis furnace. In the synthesis furnace, the two substances are fed into the furnace via a burner in a ratio of C12:H2 = 1.00:1.05 to 1.00:1.10 (the excess hydrogen is vented); they burn there, and the resulting hydrogen chloride gas is discharged from the bottom of the furnace’s cooler. At a temperature of 40 °C, this gas enters the hydrogen chloride distribution unit, where it is used to produce hydrochloric acid or high-purity acid for use in PVC production or in falling film absorption towers. The condensed acid that condenses at the outlet of the synthesis furnace, as well as the condensed acid that condenses in the hydrogen chloride buffer tank, flow into the condensed acid storage tank; from there it is sent to the hydrochloric acid adjustment tank to adjust the concentration of the final acid product. Pure water enters the pure water tank from the main pure water pipeline; after being pressurized by a pure water pump, it flows to the bottom of the jacket surrounding the synthesis furnace, cooling the furnace from bottom to top. The steam generated at the steam drum of the synthesis furnace is regulated by a steam connection valve and then, together with the high-pressure steam from the external pipes, enters the steam distribution station, from where it is sent to the low-pressure steam pipelines for use by the steam users within the plant. In special circumstances (such as production abnormalities), when the VCM process is shut down for a short period of time, hydrogen chloride gas is absorbed back. Hydrogen chloride is fed into the hydrogen chloride absorption system via a butterfly valve; the gas remaining after absorption in the primary falling film absorber enters the secondary falling film absorber for further absorption. Non-condensable gases are drawn into the acid circulation tank using a water jet ejector, where they are separated and released, or they are vented directly. The resulting acid exits from the bottom of the primary falling film absorber and enters the hydrochloric acid storage tank for sale.
Reply #32021-07-09
I personally think it’s not appropriate; the hydrogen system removes water from it beforehand to keep the water content as low as possible. Moreover, adding water at the location where the lamp is located, where there is high temperature, seems inappropriate to me. Of course, those that have been modified and used have the most say
Reply #42021-08-04
In the companies I’ve worked for, efforts were always made to remove as much moisture as possible from the hydrogen systems; using water is not appropriate in my opinion. It might be worth considering installing a flushing device at the lamp head to prevent it from getting clogged

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