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Void tower type ammonia desulfurizing process and apparatus

A technology of ammonia desulfurization and empty tower, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles. It can solve problems such as poor economic indicators, difficult maintenance, and high operating costs, and achieves convenient operation and maintenance of equipment and simplified tower body. Structure, the effect of reducing operating costs

Active Publication Date: 2007-01-03
JIANGSU NEW CENTURY JIANGNAN ENVIRONMENTAL PROTECTION
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AI Technical Summary

Problems solved by technology

However, when ammonia desulfurization is applied to the desulfurization of coal-fired boiler flue gas, the existing various technologies generally have problems such as high ammonia consumption, difficulty in eliminating aerosol, high cost of absorbing liquid treatment, and difficult operation.
Usually ammonia flue gas desulfurization uses ammonia to absorb sulfur dioxide to generate ammonium sulfite, and then oxidizes it with air, but high-concentration ammonium sulfite cannot be quickly and completely oxidized into ammonium sulfate, but is oxidized at a lower concentration and then evaporated. The product obtained by the concentration process has a large amount of evaporation, a large energy consumption, a long process, a lot of equipment, a large area, high operating costs, and poor economic indicators of the device.
In order to ensure efficiency, most of the desulfurization towers of the wet ammonia method use a packed tower structure, which brings problems such as complex equipment and difficult maintenance.
The existence of these problems makes the implementation of ammonia desulfurization technology encounter great obstacles

Method used

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  • Void tower type ammonia desulfurizing process and apparatus

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Embodiment

[0014] The process and device embodiment of the present invention treats a coal-fired boiler with an evaporation capacity of 220t / h and a flue gas volume of 280,000Nm 3 / h, the coal consumption of the boiler is 32t / h, the total sulfur of coal combustion is 3%, and the exhaust gas temperature is 140°C.

[0015] Desulfurization device and process such as figure 1 Shown:

[0016] The core equipment desulfurization tower is 25 meters high and 7.8 meters in diameter. The primary sprinkler system of the tower (2.5 meters away from the top of the flue gas inlet) is equipped with a layer of spraying devices (23 nozzles for preventing and blocking); the secondary spraying system of the tower (2.5 meters away from the primary absorption section) Set up two layers of spraying devices (layer distance 2.5 meters, each layer is equipped with 23 anti-blocking nozzles); the bottom of the flue gas inlet is 13 meters away from the bottom plate of the tower, and there are three layers of grids...

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Abstract

The present invention belongs to the field of environment protection apparatus, and is especially void tower type desulfurizing process and apparatus for removing and recovering SO2 from fume. The apparatus includes one desulfurizing tower with fume inlet in the middle part, fume outlet in the top, absorbing and sprinkling section, dewatering and defogging section, and oxidizing section in the bottom; one primary and one secondary circulating pump outside the tower connected to the absorbing and sprinkling section and the oxidizing section; one thick liquid circulating pump outside the tower; one ammonium sulfate thickener; one centrifuger and one drier. The present invention has low cost and convenient apparatus maintenance and operation.

Description

technical field [0001] The invention belongs to environmental protection equipment and relates to an empty tower type ammonia desulfurization process and device for removing and recovering sulfur dioxide in flue gas. Background technique [0002] The traditional flue gas desulfurization process mainly adopts calcium desulfurization technology, which has defects such as secondary pollution and difficult disposal of desulfurized gypsum. Compared with the calcium desulfurization process, the existing ammonia desulfurization process uses ammonia to absorb sulfur dioxide in the flue gas, and the reaction is a gas-liquid or gas-gas phase reaction. The reaction speed is fast, the utilization rate of the absorbent is high, and the volume of the absorption equipment is can be greatly reduced. However, when ammonia desulfurization is applied to the desulfurization of coal-fired boiler flue gas, the existing various technologies generally have problems such as high ammonia consumption...

Claims

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Application Information

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IPC IPC(8): B01D53/50B01D53/78B01D53/18
Inventor 徐长香罗静傅国光
Owner JIANGSU NEW CENTURY JIANGNAN ENVIRONMENTAL PROTECTION
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