Half-dry low-temperature smoke denitrification system

Abstract

The invention provides a half-dry low-temperature smoke denitrification system which comprises a reactor, a dust remover, an exhauster, an alkali liquor and gas high pressure mixer, an ozone supply device and an ultraviolet radiation device, wherein the reactor comprises a smoke inlet, an ozone inlet, a purified gas outlet and a high pressure spraying device; the smoke inlet of the reactor is connected with a conveying pipeline of smoke to be purified; the purified gas outlet of the reactor is connected with the inlet of the dust remover; the outlet of the dust remover is connected with the exhauster or a heat recovery device; the ozone inlet is connected with the ozone supply device; the ultraviolet radiation device is arranged at a position, close to the smoke inlet, inside the reactor; an alkali liquor input port and a gas input port are formed on the alkali liquor and gas high pressure mixer; and the output end of the alkali liquor and gas high pressure mixer is connected with the high pressure spraying device in the reactor. The half-dry low-temperature smoke denitrification system can be applied to power plants, fire coal or fuel boilers and industrial kilns.

Description

Technical field: [0001] The invention relates to a brand-new flue gas denitrification and dust removal system, which belongs to the technical field of flue gas purification. Background technique; [0002] With the increasingly serious domestic air pollution and the emphasis on flue gas desulfurization and the extensive use of desulfurization technology, the sulfur compounds discharged into the atmosphere have been greatly reduced, while NO x The impact on gas has become increasingly prominent, and has become my country's second SO 2 One of the important air pollutants that needs to be treated urgently. [0003] At present, domestic flue gas desulfurization and denitrification mostly adopt catalytic reduction flue gas denitrification (SCR) process, and lime, limestone-gypsum wet desulfurization and denitrification process. [0004] The above (SCR) process and the catalyst used in it need to be in a high temperature state of about 350°C-450°C to ensure its good denitrificati...

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Problems solved by technology

[0004] The above (SCR) process and the catalyst used in it need to be in a high temperature state of about 350°C-450°C to ensure its good denitrification effect. Since most large and medium-sized boilers are equipped with heat recovery systems The heat is recovered and utilized, and the temperature of the final exhausted flue gas is generally lower than 300°C, so the (SCR) system must be installed at the front end of the heat recovery system, which requires opening a branch in the flue gas channel to connect with the SCR system. The flue gas treated by SCR flows to the heat recovery system for heat recovery, resulting in extremely complex system structure and heat loss

[0005] Lime, limestone - gypsum wet desulfurization and denitrification process requires powder addition devices and / or absorption towers to be installed in the system. The residual amount of lime or gypsum powder in the treated exhaust gas is large, which increases the load on the dust removal device, and Using the above wet process will produce liquid by-products causing secondary water pollution

[0006] Therefore, the above-mentioned process has high purification efficiency, but its structure is complex, the volume of the absorption tower is very large, the system occupies a large area, the load of the dust collector is large, there is secondary water pollution, the equipment investment is expensive, the operating cost is high, and the construction and installation period is long. Disadvantages such as difficulty in operation and management, especially the catalyst used for denitrification needs to rely on imports, and the high cost restricts its widespread promotion

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