Nitric acid gas absorber

Abstract

The invention relates to a nitric acid gas absorber. The top of a housing (1) is provided with a gas outlet (8), and the upper part is provided with a water inlet (7); a bubbling hood (3) in the middle of the housing (1) and a cooling coil (9) are fixed to tower trays (2); downflow spouts (4) are fixed to the tower trays (2) and communicate every two tower trays (2); the outlet of the downflow spout (4) at the lower part of the housing (1) is communicated with a nitric acid room (12) at the bottom of the housing (1); the lower part of the housing (1) is a nitric acid gas room (11); the housing (1) at the upper part of the nitric acid gas room (11) is provided with a nitric acid gas inlet (10); the bottom of the housing (1) is connected with a skirt support (14); and the bottom of the nitric acid room (12) is provided with a nitric acid outlet (13) that is communicated with the skirt support (14).The invention has the advantages of simple structure, easy and convenient operation and low cost. The treated nitric acid gas meets the environmental protection index specified in GB 16297.

Description

technical field [0001] The invention relates to a gunpowder smoke absorber for absorbing nitrogen oxides in gunpowder smoke gas with water. Background technique [0002] The by-product gunpowder gas produced in the chemical plant, and the direct emission of nitrogen oxides in the smoke gas will pollute the environment and affect human health and plant growth. In order to reduce or eliminate this hazard, lye is usually used to absorb nitrogen oxides to produce sodium nitrate and sodium nitrite. This process not only consumes lye, but also the absorption effect is not very ideal. The waste water produced by it will cause secondary pollution to the environment and requires two Second processing increases the total cost of the device. Ammonia is also used as a reducing agent to carry out catalytic reduction to remove nitrogen oxides, which has high removal efficiency and does not produce secondary pollution, but the heat released by the catalytic reaction cannot be taken away, ...

AI Technical Summary

Problems solved by technology

[0002] The by-product gunpowder gas produced in chemical installations, the direct discharge of nitrogen oxides in the smoke gas will pollute the environment and affect human health and plant growth

In order to reduce or eliminate this hazard, lye is usually used to absorb nitrogen oxides to produce sodium nitrate and sodium nitrite. This process not only consumes lye, but also the absorption effect is not very ideal. The waste water produced by it will cause secondary pollution to the environment and requires two secondary treatment, increasing the total cost of the device

Ammonia is also used as a reducing agent to carry out catalytic reduction to remove nitrogen oxides, which has high removal efficiency and does not produce secondary pollution, but the heat released by the catalytic reaction cannot be taken away, which will reduce the life of the catalyst or deactivate it. There are strict requirements on the material of the equipment, which makes the equipment huge, and the addition of auxiliary equipment for cooling also increases the total cost of the device

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