Desulfurization and denitrification tower and desulfurization and denitrification method

Abstract

The invention discloses a desulfurization and denitrification tower and a desulfurization and denitrification method, and belongs to the field of gas purification. The desulfurization and denitrification tower comprises a tower body, a gas inlet and a gas outlet, the gas inlet and the gas outlet are respectively connected with a gas inlet pipe and a gas outlet pipe, and the desulfurization and denitrification tower is provided with a desulfurization and denitrification layer. The desulfurization and denitrification layer is sequentially provided with a desulfurization section and a denitrification section along the gas flowing direction, and the desulfurization section and the denitrification section are filled with a desulfurization adsorbent and a denitrification adsorbent. The desulfurization and denitrification method comprises a desulfurization step and a denitrification step which are carried out in the desulfurization section and the denitrification section in sequence, and an adsorbent regeneration step of a desulfurization adsorbent or / and a denitrification adsorbent. According to the desulfurization and denitrification tower and the desulfurization and denitrification method, the desulfurization step and the denitrification step are separated, and the desulfurization step is carried out before the denitrification step, so that the influence on the gas denitrification efficiency caused by adsorbent poisoning due to the existence of sulfides can be effectively avoided. In addition, the desulfurization section and the denitration section can perform regeneration operation of the adsorbent respectively or simultaneously according to actual working conditions, so that energy consumption is effectively reduced.

Description

technical field [0001] The invention relates to the field of gas purification, in particular to a gas desulfurization and denitration tower and a desulfurization and denitration method. Background technique [0002] With the advancement of sustainable development, the proportion of coal consumption in my country's energy consumption structure is decreasing year by year, and the proportion of clean energy consumption such as natural gas, hydropower, nuclear power, and wind power is increasing year by year. Although my country's energy structure is being further optimized, coal is still the main source of energy in the short term, and the use of coal will inevitably emit sulfides (including organic sulfur and inorganic sulfur), nitrogen oxides (NO x ) and volatile organic compounds (VOCs) such as environmentally harmful gases, excessive sulfur compounds and NO x Emissions can also cause photochemical smog, acid rain, ozone layer depletion and smog, etc., damage the ecological...

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Problems solved by technology

[0005] Although the integration of desulfurization and denitrification has been achieved by the above method, due to the SO2 and NOx in the gas There is an adsorption competition among them. When SO2 exists, it will be preferentially adsorbed on the adsorbent, and stable sulfate and sulfite will be formed on the active site to cause sulfur poisoning of the adsorbent, resulting in NOx decreases

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