Wet flue gas desulphurization technology by utilization of ethylene waste lye

Wet flue gas desulphurization technology by utilization of ethylene waste lye

  • CN 103,480,260 A
  • Filed: 09/17/2013
  • Published: 01/01/2014
  • Est. Priority Date: 09/17/2013
  • Status: Active Grant
First Claim
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1. a wet fuel gas desulfurizing technology that is beneficial to ethylene waste lye, desulfurizing tower is set, it is characterized in that, tower top is established direct exhaust chimney, collect desulfurization and absorbed liquid oxidation and flue gas desulfurization in a tower, be divided into oxidation at the inner tower bottom of desulfurizing tower and absorb liquid pool, be provided with former smoke inlet on desulfurizing tower wall above oxidation absorbs the liquid pool liquid level, set gradually the desulfurization absorbent slurry spraying system above the former smoke inlet of desulfurizing tower inside, flue gas washing system and demister system, desulfurization absorption liquid spraying layer by layering forms the desulfurization absorbent slurry spraying system, form respectively flue gas washing system and demister system by the fresh water (FW) spraying layer, former flue gas is divided into two-way, one tunnel enters desulfurizing tower inside through the former smoke inlet on the desulfurizing tower wall and carries out desulfurization, the former flue gas in another road is discharging directly into atmosphere after bypass flue enters the direct exhaust chimney of desulfurization tower top and clean flue gas after desulfurization mixes, be that bypass flue is communicated with the formation heat exchanger with the direct exhaust chimney of desulfurization tower top, all waters of whole desulphurization system are all from the technique water tank, and the fresh water (FW) liquid level in control technique water tank, the main sweetening process of its wet fuel gas desulfurizing technology comprises following process portion:

  • A. the desulfurization absorbent supply is with supplementary;

    the spent lye surge tank is set outside desulfurizing tower, spent lye is from the chemical plant ethylene unit, spent lye in the spent lye surge tank is delivered to the outer desulfurization absorbent pump entry place of desulfurizing tower by the salkali waste liquid pump, control the spent lye liquid phase liquid level in the spent lye surge tank, when the salkali waste liquid measure is in liberal supply, the spent lye of only usining just can meet the pH value of desulfurization absorption liquid is controlled within the required range as desulfurization absorbent;

    The fresh soda liquid storage tank perhaps also is set outside desulfurizing tower, lay in fresh alkali lye, control the fresh alkali lye liquid phase liquid level in the fresh soda liquid storage tank, when the salkali waste liquid measure is under-supply, by measuring pump, fresh alkali lye is delivered to spent lye pump discharge pipe place, the desulfurization absorbent that fresh alkali lye and spent lye are mixed to form is controlled the pH value of absorption liquid within the required range;

    B. desulfurization absorbent slurries spray and washing;

    former smoke inlet from the desulfurizing tower wall enters desulfurizing tower inside to former flue gas to be desulfurization through flue, at first pass through the desulfurization absorption liquid spraying layer of layering, make that desulfurization absorbent slurries droplet that desulfurization absorption liquid spraying layer discharges contacts with former flue gas that mixing is absorbed, after reaction desulfuration, pass through again fresh water (FW) spraying layer spray washing, then by entering the direct exhaust chimney on desulfurizing tower top after the demister system;

    C. the discharge of clean flue gas;

    the clean flue-gas temperature through desulfurization carrying out washing treatment in described b technical process reduces, when clean flue gas enters the direct exhaust chimney zone of desulfurization tower top in rising, with the former flue gas that does not pass through the high temperature of desulfurization carrying out washing treatment, mixed, meeting under the prerequisite of discharge standard, improve the temperature of discharge flue gas, control the flue gas flow that enters the desulfurization tower top through bypass flue by the flue gas flow adjusting device;

    D. the oxidation of desulfurization absorption liquid is disposed;

    carrying out desulfurization absorbent slurries after the gas-liquid contact reaction desulfurization with former flue gas becomes and has absorbed liquid, absorption completes liquid and collect formation oxidation absorption liquid pool at the bottom of the desulfurizing tower tower, control oxidation absorption liquid pit level, be provided with aeration tube at the bottom of tower, the oxidizing gas blasted by blower fan oxidation at the bottom of aeration tube sprays into tower absorbs liquid pool, absorption is completed to liquid and carry out oxidation processes;

    E. the absorption after oxidation completes the post processing of liquid;

    the absorption after the oxidation of described d technical process completes liquid and is disposed to the sedimentation basin outside desulfurizing tower in the gravity flow mode at the bottom of by the desulfurizing tower tower, clear liquid after precipitation drains into clean solution tank, then be delivered to sewage treatment plant and process, the mud after precipitation drains into grey slag bath and is processed.

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