Device for removing sulfuric dioxide in exhaust gas

Abstract

The invention relates to a device for removing sulfur dioxide in waste gases, which comprises an absorption tower (1). The side surface of the middle of the adsorption tower (1) is provided with a waste gas inlet port (12). The adsorption tower (1) is internally provided with a liquid-gas distributor (3). The top of the adsorption tower (1) is provided with a clean gas discharge outlet (11) while the lower part of the adsorption tower (1) is provided with an absorption liquid concentration oxidation zone (13). The device is characterized in that the waste gas inlet port (12) is communicated with a cooling device in the adsorption tower (1); the gas outlet of the cooling device is arranged below the liquid level of the absorption liquid of the concentration oxidation zone (13); the concentration oxidation zone (13) is communicated with the inner chamber of the adsorption tower (1). The device has the advantages that the waste gas cooling is carried out in the cooling device in the adsorption tower (1); the temperature of the gas in the inner chamber of the absorption tower is reduced into 45 DEG C to 60 DEG C; as the temperature is lower, the absorption effect is better after the gas and the liquid contact; therefore, when the gas with low temperature enters into the adsorption tower, the absorption rate is drastically increased; the device causes that processes such as waster gas, temperature reduction, concentration absorption liquid, desulphurization, oxidation and the like are concentrated in a desulfurizing tower to be completed, thus simplifying the low, reducing the equipment investment, fully making the best of device space and optimal land utilization.

Description

technical field [0001] The invention relates to a device for removing sulfur dioxide in waste gas. Background technique [0002] Usually, SO is contained in exhaust gas from mining industry, sulfuric acid industry, or coal-fired and oil-fired boilers. 2 gas. Even trace amounts of SO 2 Due to the huge amount of emissions, it will also cause serious damage to the environment and ecology. According to reports, my country has become the most severely affected area by acid rain after the Americas and Europe, and large tracts of forests and land have been destroyed. my country has clearly required that new power plants must be equipped with exhaust gas desulfurization devices, and that existing power plants with excessive emissions must install desulfurization facilities before the end of 2010. Those that have been in operation for more than 20 years or have an installed capacity of less than 100,000 kilowatts will be retrofitted or shut down within a time limit . At the same ...

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Problems solved by technology

But its disadvantages are: 1. The exhaust gas cooling is carried out in the absorption section of the gas-liquid separator in the absorption tower, that is, the exhaust gas is cooled by the water sprayed from the gas-liquid distributor or the countercurrent contact of the absorption liquid, and the cooling water It is added from the top of the desulfurization tower and mixed with the absorption liquid in the tower, resulting in: a. The absorption liquid is diluted; b. The temperature of the exhaust gas entering the desulfurization tower is higher. If it is to pass through the absorption liquid (or a mixture of water and absorption liquid) Countercurrent contact reduces the exhaust gas to a relatively low temperature, and can only increase the height of the desulfurization tower or increase the liquid-gas ratio

Both of the above two will lead to a decline in its absorption effect, or increase equipment investment and increase operating costs

2. The absorbing liquid distributor of this structure is a liquid sprayer, that is, the absorbing liquid is sprayed through the spray head, and the upwardly flowing gas flows upward through one side of the inner wall of the absorption tower. This structure is for the formation of gas-liquid Bias flow, so that the gas distribution is uneven, resulting in reduced contact area and low absorption rate; in addition, the gas-liquid separator rises due to the bias flow, which will increase the rising resistance of the gas and reduce the working efficiency

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