Flue gas desulfurization method of heating boiler and device thereof

Abstract

The invention relates to a flue gas desulfurization method of a heating boiler and a device thereof, belonging to the technical field of heating boilers. The flue gas desulfurization method of the heating boiler comprises the following steps of: precooling, desulfurizing, magnesium oxide pulping, absorption liquid aeration and crystallizing dehydration. In the precooling step, glue gas enters a precooling tower through a flue gas inlet channel for precooling, and absorption liquid is atomized and sprayed; in the desulfurizing step, the flue gas enters a desulfurizing tower for desulfurizing, and the absorption liquid is atomized and sprayed; the flue gas is discharged through a chimney; in the step of magnesium oxide pulping, magnesium oxide powder is pulped in a digestion tank; in the step of absorption liquid aeration, an air blower carries out aeration on the absorption liquid by a gas distribution pipe; and in the step of crystallizing dehydration, magnesium sulfate crystal size is crystallized and dehydrated. The flue gas desulfurization device of the heating boiler is characterized in that the flue gas inlet channel is communicated with the precooling tower by a draught fan; the precooling tower is communicated with the desulfurizing tower through a flue; the desulfurizing tower is communicated with the chimney; an absorption liquid atomization spray mechanism is respectively arranged in the precooling tower and the desulfurizing tower; the air blower is communicated with an aeration gas distribution pipe; a circulating water pool is communicated with a dehydrator; and a spray circulating pump is communicated with the digestion tank. The invention has the advantages of good desulfurizing effect, high desulfurizing efficiency, little water along with flue gas discharge, convenient operation, environmental protection and the like.

Description

technical field [0001] The invention belongs to the technical field of heating boilers, and in particular relates to a flue gas desulfurization method of a heating boiler and a device thereof. Background technique [0002] At present, the flue gas desulfurization of industrial heating boilers, especially the wet desulfurization process, has the following shortcomings in specific applications: [0003] 1. Most of them are dust removal and desulfurization integrated devices, and most of them are water film or water bath desulfurization dust collectors. The desulfurization effect is poor, and the dust removal ash is mixed with the desulfurization circulating fluid, which not only causes a decline in desulfurization efficiency, but also is not conducive to the treatment of by-products . [0004] 2. The existing desulfurization atomizing nozzle is in the form of a shower head, which is easy to block and cannot guarantee the normal operation of the atomizing device. [0005] 3. ...

AI Technical Summary

Problems solved by technology

[0003] 1. Most of them are dust removal and desulfurization integrated devices, and most of them are water film or water bath desulfurization dust collectors. The desulfurization effect is poor, and the dust removal ash is mixed with the desulfurization circulating fluid, which not only causes a decline in desulfurization efficiency, but also is not conducive to the treatment of by-products

[0004] 2. The existing desulfurization atomization nozzle adopts the form of a shower head, which is easy to block and cannot guarantee the normal operation of the atomization device

[0005] 3. The problem of water in the exhaust gas is serious

Most of the traditional dehydration and defogging devices adopt steel ball net structure, which is easy to be blocked by smoke and dust, resulting in large resistance, incomplete dehydration, easy to corrode the subsequent flue, and acid mist to pollute the external environment

[0006] 4. There is no oxygen aeration device, resulting in unstable desulfurization products and easy to cause secondary pollution

In the traditional desulfurization process, the final product is SO 3 2- Compounds, easy to precipitate SO in wind, rain and sun exposure 2 or form H 2 SO 3 , re-enter the air or flow into the sewer to cause secondary pollution

[0007] 5. Severe fouling of the pipes and walls of the desulfurization system may easily cause pipeline blockage

[0008] 6. In the existing desulfurization agent (pharmaceutical) part, simple pharmaceutical methods such as manual direct dumping are mostly used, which not only causes dust pollution on site, but also has high labor intensity for workers, and the pulping effect is very poor, prone to precipitation, waste of resources, etc.

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