Coal-based natural gas flue gas multi-point replacement desulfurization device and use method thereof

Abstract

The invention discloses a coal-based natural gas flue gas multi-point replacement desulfurization device and a use method thereof, and belongs to the technical field of flue gas desulfurization. A flue gas distribution mechanism is distributed on the pipe wall of a rectangular pipe; therefore, flue gas introduced into a desulfurization box is effectively subjected to a multi-point distribution treatment; when a liquid desulfurization alkaline medicine is sprayed downwards; the liquid medicine can be in full and uniform contact with the flue gas subjected to multi-point diffusion; after sufficient neutralization, the sulfur element in the flue gas is replaced; multi-point desulfurization operation is realized, the low desulfurization efficiency caused by non-uniform local desulfurization iseffectively avoided; besides, desulfurized gas is introduced into a circulating cooling pipe, high-temperature water vapor in the gas is cooled and liquefied, a gas cooling treatment is effectively achieved, water drops formed by liquefaction are guided downwards and adsorbed and dried by adsorption cotton, water mist is easy to remove, and the effect is good.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization, and more specifically relates to a multi-point displacement desulfurization device for coal-based natural gas flue gas and a method for using the same. Background technique [0002] Coal-to-natural gas usually refers to the use of mined raw coal to produce synthetic natural gas through a gasification process. With the implementation of policies such as domestic sustainable development strategy and strengthening of environmental protection, the domestic natural gas consumption market will continue to expand. To expand the supply of natural gas resources through multiple channels and in multiple ways, and to improve the structure of gas sources has become an important strategy for optimizing my country's energy structure. As a substitute and supplement for liquefied petroleum gas and natural gas, coal-to-natural gas not only realizes a new way of clean energy production, optimizes...

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Problems solved by technology

[0004] In the prior art, the wet desulfurization method is often used, and the process of the wet desulfurization is generally as follows: after the dust is removed, the flue gas is directly passed into the desulfurization tank containing the alkaline liquid to carry out the neutralization reaction, and the reacted solution is passed through After filtering, it is circulated and pumped into the desulfurization tower for neutralization reaction to achieve the desulfurization effect. Since the flue gas is directly passed into the alkaline liquid for desulfurization, local desulfurization is prone to unevenness, resulting in low desulfurization efficiency; at the same time, wet desulfurization needs to increase the liquid-gas ratio In order to achieve a higher removal efficiency, this causes the water carried in the discharged purified flue gas to reach a saturated state. The demister in the flue gas desulfurization device can only remove part of the entrained water in the flue gas, while the wet desulfurization exhaust flue gas The temperature of the gas is generally around 50°C, and a large amount of water vapor remains in the desulfurized gas. These high-temperature water vapors are discharged into the atmosphere along with the desulfurized gas, thereby intensifying the greenhouse effect.

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