Device and process for converting calcium process desulfurization into temperature difference crystallizing ammonia process desulfurization

Device and process for converting calcium process desulfurization into temperature difference crystallizing ammonia process desulfurization

CN
  • CN 101,670,231 B
  • Filed: 07/23/2009
  • Issued: 08/24/2011
  • Est. Priority Date: 07/23/2009
  • Status: Active Grant
First Claim
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1. the device of the temperature difference crystallization ammonia process of desulfurization is changeed in a calcium method desulfurization, include desulfurizing tower, enrichment device, gas-liquid heat-exchange, circulating pump, concentrate circulating pump, magma pump, condensing crystallizing groove, drying system, it is characterized in that:

  • desulfurizing tower, circulating pump, magma pump, drying system all are the equipment that has utilized in the desulfurization of original calcium method;

    Enrichment device bottom is provided with gas distributor, and its top is provided with shower nozzle, and this shower nozzle is a layer 2-3;

    The desulfurizing tower shower nozzle is the layer 2-4 setting, and liquid supplementation pipe is connected with undermost shower nozzle in the desulfurizing tower;

    The condensing crystallizing groove is the tapered groove in bottom, and top has pipeline to be connected with enrichment device bottom, and the middle part has pipeline to be connected with concentrated circulating pump, and the bottom has pipeline to be connected with the magma pump;

    The technology that the temperature difference crystallization ammonia process of desulfurization is changeed in the calcium method desulfurization of carrying out in its described device is;

    A. flue gas is at first advanced mouth by device and is entered gas-liquid heat-exchange, after flue gas is lowered the temperature, entering the enrichment device contacts with the absorption liquid that sprays by shower nozzle, sulfur dioxide in the flue gas, or generate ammonium sulfite with ammoniacal liquor generation chemical reaction in the absorption liquid, or generating ammonium bisulfite with ammonium sulfite reaction in the absorption liquid, flue gas is by preliminary purification like this;

    Flue gas is advanced mouth by desulfurizing tower and is entered desulfurizing tower then, and sulfur dioxide of flue gases continues to take place chemical reaction with ammoniacal liquor or ammonium sulfite in the absorption liquid that is ejected, like this flue gas by smart desulfurization after exhaust outlet discharge;

    B. absorption liquid is from the shower nozzle spray on desulfurizing tower top, with circulating pump absorption liquid is transported to shower nozzle in the desulfurizing tower and the shower nozzle in the enrichment device respectively from desulfurizing tower bottom, absorption liquid arrives desulfurizing tower bottom and enrichment device bottom from shower nozzle spray back, ammonium bisulfite in the absorption liquid is met ammoniacal liquor and is reduced into ammonium sulfite, the oxygen reaction that ammonium sulfite and gas distributor come out generates ammonium sulfate, the absorption liquid of enrichment device bottom flows into the condensing crystallizing groove, ammonium sulfate in the absorption liquid is carried out crystallisation by cooling, the precipitation and separate, the magma part is pumped into drying system by magma, supernatant partly is concentrated circulating pump and carries through the preliminary intensification of gas-liquid heat-exchange after the shower nozzle spray in the enrichment device, contact the also enrichment that further heats up with the flue gas in the enrichment device, move in circles;

    C. ammoniacal liquor replenishes by liquid supplementation pipe undermost shower nozzle spray in desulfurizing tower;

    D. oxic gas is pressurized is conveyed into bottom the desulfurizing tower and the gas distributor bottom the enrichment device, oxygen in the oxic gas and the reaction of the ammonium sulfite in the absorption liquid generate ammonium sulfate and are dissolved in the absorption liquid, the gas of not participating in reaction in the enrichment device advances mouth through desulfurizing tower and enters in the desulfurizing tower, does not participate in the gas of reaction and discharge through exhaust outlet in desulfurizing tower.

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