Device for reducing acid mist emission of acid making chimney

Abstract

The invention relates to a device for reducing acid mist emission of an acid making chimney. The device comprises a fan, a main passage air flow meter, a combustion-supporting air flow meter, a main passage air electromagnetic valve, a combustion-supporting air electromagnetic valve, a coal gas electromagnetic valve, a coal gas needle core valve, an ignition transformer, a silicone oil electric tracing pipe, a flame detector, an ignition rod, a coal gas electromagnetic valve, a silicone oil storage tank, a silicone oil flow control valve, a combustion chamber and an acid mist controller outlet, wherein the fan is connected with a main passage and a combustion-supporting air passage, the main passage is provided with the main passage air flow meter and the main passage air electromagnetic valve, the combustion-supporting air passage is provided with the combustion-supporting air flow meter and the combustion-supporting air electromagnetic valve, the other ends of the main passage and the combustion-supporting air passage are connected with a combustion chamber, a coal gas pipeline is connected with the combustion chamber, the coal gas pipeline is provided with the coal gas electromagnetic valve, the end portion of the coal gas pipeline is provided with the coal gas needle core valve, the silicone oil storage tank is connected with the combustion-supporting passage through a silicone oil pipeline and the silicone oil electric tracing pipe, the silicone oil pipeline is provided with the silicone oil flow control valve, one side of the combustion chamber is provided with the acid mist controller outlet, and a SiO2 concentration tester is arranged in the acid mist controller outlet.

Description

technical field [0001] The invention relates to a device, in particular to a device for reducing the discharge of acid mist from an acid chimney, and belongs to the technical field of coking equipment. Background technique [0002] The WSA acid production process can convert various sulfides in acid gas into concentrated sulfuric acid, as follows: use K2CO3 solution as a desulfurizer, wash coke oven gas under normal pressure, and absorb acidic components such as H2S, HCN, and CO2 , and then analyze under vacuum conditions to obtain acid gases containing H2S, HCN, CO2, etc. The acid gases first pass through the mist collector and filter to separate the condensate and entrained impurities, and then enter the incinerator for combustion to produce SO2 gas. The gas enters the SO2 converter and is converted into SO3 under the action of HTAS sulfuric acid catalysts on the two catalytic beds. The converted gas is acid-containing process gas, and the process gas is finally cooled fr...

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Problems solved by technology

[0005] However, since the chimney acid mist emission value is directly affected by the concentration of silicon dioxide particles added by the acid mist controller, the operator adjusts the opening of the silicone oil flow control valve based on experience when the outlet emission value does not exceed 45mg / m³. Control the amount of silicone oil added, and the flow rate of the process gas will be affected by factors such as the inlet pressure of the WSA condenser and will be in a state of constant change, resulting in a constantly changing state of silicone oil concentration, which results in the control accuracy of the amount of silicone oil added If the amount of silicone oil added is low, the emission will exceed the standard due to the inappropriate amount of silicone oil added. If the amount of silicone oil added can be precisely controlled, the emission of chimney acid mist can be further reduced

[0006] Secondly, the gas source used by the acid mist controller for combustion is coke oven gas. The tar and naphthalene impurities in the gas are extremely high. After being burned by the acid mist controller, the impurities enter the acid-containing process gas together with silica particles, affecting The nucleation effect of silica particles leads to poor separation between acid mist and process gas, and the acid mist cannot be completely captured. The uncaptured acid mist is directly discharged from the chimney, resulting in the acid mist content of the tail gas exceeding 45mg / m³. Exceeding emission standards

In addition, tar and naphthalene impurities will enter the finished acid tank together with the trapped acid, resulting in a decline in the quality of the finished sulfuric acid, which is lower than the required concentration of 98%.

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