Synchronous desulfurization and denitrification technology of coal-fired flue gas by taking hydrogen sulfide as reducing agent
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A technology for desulfurization, denitrification, and coal-burning flue gas, which is applied in the preparation/purification of sulfur, anaerobic digestion treatment, air quality improvement, etc. cost, realize the effect of waste heat utilization, and reduce load
Inactive Publication Date: 2016-01-06
SOUTH CHINA NORMAL UNIVERSITY
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NH 3 When used as a reducing agent, the investment and operation costs are high, and the reaction will generate N 2 O, causing the greenhouse effect; CH 4 When used as a reducing agent, the reaction requires high temperature, high energy consumption, and easy to generate CO 2 , easy to deposit carbon; when CO is used as a reducing agent, a large amount of CO will be produced 2 , causing the greenhouse effect
Moreover, H 2 、CH 4 Neither CO nor CO can be produced from boiler plants or flue gas production sites, and its purchase, transportation, storage, and use costs are high, which restricts the application of synchronous catalytic flue gas desulfurization and denitrification processes
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[0054] 1) Dissolved H 2 Preparation of S: Add organic sources, elemental sulfur and sulfur-reducing bacteria into the anaerobic biological sulfur reduction reactor to fully contact the organic source, elemental sulfur and sulfur-reducing bacteria. Under the action of sulfur-reducing bacteria, the organic matter is oxidized and removed, and the elemental sulfur Sulfur is converted to H 2 S, the effluent of the reactor is rich in dissolved H 2 S;
[0055] 2)H 2 S, NO, NO 2 , SO 2 Preparation of mixed gas: will be rich in dissolved H 2 The effluent of S is passed into the gas-liquid separator from the top, and the coal-fired flue gas is passed into the gas-liquid separator from the bottom at the same time, the water flow and the flue gas are in reverse contact, and the gas-liquid separation is carried out to obtain H 2 S, NO, NO 2 , SO 2 mixed composition;
[0056] 3) Synchronous desulfurization and denitrification: H 2 S, NO, NO 2 , SO 2 The mixed gas and catalyst ar...
Embodiment
[0068] like image 3 As shown, a reaction device for coal-fired flue gas synchronous desulfurization and denitrification process using hydrogen sulfide as a reducing agent includes the following main components: packed bed biofilm reactor, tube furnace reactor, and spray stripping tower.
[0069] The anaerobic biological sulfur reduction reactor is a packed bed biofilm reactor with a dissolved oxygen concentration of <0.2mg / L. The total volume of the reactor is 1.3L, the filler is sulfur, the filler volume is 0.5L, and the effective volume is 0.8L. The container is made of plexiglass. The gas-liquid separator adopts a spray blow-off tower, and the spray blow-off tower adopts a conventional packing mode. The packing is a multi-faceted hollow ball, which adopts the method of water inlet from the upper part and flue gas from the bottom. There is a rectifying plate on the top. The total volume of the blow-off tower is 2.5L, the packing volume is 1.8L, the air-water ratio is 1: (2...
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Abstract
The invention discloses synchronous desulfurization and denitrification technology of coal-fired flue gas by taking hydrogen sulfide as a reducing agent. The technology comprises the following steps: 1) preparation of dissolved H2S; 2) preparation of a mixed gas of H2S, NO, NO2, and SO2; and 3) synchronous desulfurization and denitrification. According to the technology, integration of a desulfurization and denitrification device is authentically realized. NO and NO2 in the coal-fired flue gas are converted into N2 and water; SO2 and H2S are converted to high-purity elemental sulfur; and organic matters in waste water are further removed, so that treatment of wastes with other wastes is realized. Elemental sulfur is recycled through the technology; one part of elemental sulfur is cycled and utilized to maintain equipment operation; and the other part of elemental sulfur is output as a product. The reducing agent of H2S in the technology is prepared from an in-situ product of elemental sulfur through reduction, can be prepared when used, and does not need to be bought outside. Therefore, cost of purchase, transportation, and storage and potential security risk are avoided. Compared with a mainstream device, the desulfurization and denitrification device is significantly lower with respect to land occupation, construction cost, operation cost, and the like.
Description
technical field [0001] The invention relates to a coal-fired flue gas synchronous desulfurization and denitrification process using hydrogen sulfide as a reducing agent. Background technique [0002] Coal is the main energy source in my country. The proportion of coal in primary energy consumption has been maintained at about 70% for a long time, which determines that my country's primary energy production and consumption structure dominated by coal will be difficult to change for a long time in the future. SO produced by a large amount of coal burning 2 and NO X And the resulting acid rain, photochemical smog and smog have serious harm to human health and ecological environment, restricting the sustainable development of society and economy. Therefore, it is necessary to analyze the SO in flue gas 2 and NO X Take control. [0003] According to the national "Twelfth Five-Year Plan", the total coal consumption in my country will reach 3.8 billion tons in 2015, while SO ...
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