Purification method for straw gasified gas and equipment thereof

Abstract

The invention relates to a purification method for straw gasified gas and equipment thereof. Equipment for separating, recycling and converting tar-containing wastewater is designed and installed on a gas producer and a purification device of the current gasifier; the equipment separates most of tar from water in crude gas firstly; and the separated tar-containing wastewater is not discharged but fully converted into combustible gas to be sufficiently combusted in a cooking stove. In the invention, a tar-containing wastewater converting device and a three-dimensional oxygen supply device are installed on the cooking stove; a small amount of tar-containing wastewater which is not separated after the gas passes through the purification device is fully converted into the combustible gas by the tar-containing wastewater converting device, and the combustible gas is delivered with other gas into a combustion chamber and combusted in three-dimensional oxygen supply environment, thus realizing zero discharge of the tar-containing wastewater in the gasified gas; the calorific value of the gas is as high as 5100KJ / Nm<3>, and the gasification efficiency is greater than or equal to 72%; and the combustion temperature is 100-200 DEG C higher than that of the current cooking stove, fuel is saved by 10-15% compared with common gasifiers, and the gas is to easy ignite, has the advantages of sufficient combustion, no release of harmful gas and energy saving and is environmental friendly.

Description

technical field [0001] The invention relates to a purification technology of biomass gasification gas, in particular to a purification method and equipment for straw gasification gas. technical background [0002] The straw gasification furnace is a kind of gasification reaction that puts renewable energy fuels - various crop straws, corn cobs, rice husks and other agricultural product waste, leaves, sawdust, fungal residue, animal manure and domestic garbage (combustible) It is converted into combustible gas through oxidation, reduction, and pyrolysis, and then sent to a special stove for combustion after being purified by a purification device. The chemical energy of biomass is converted into heat energy for cooking, heating or other purposes. Renewable energy products. Compared with traditional stoves, the straw gasifier has the functions of saving fuel, safety and environmental protection, and convenient use. However, the straw gasification gas directly coming out of t...

AI Technical Summary

Problems solved by technology

[0010] 1. Incomplete technology: wet purification can only separate tar, water vapor and impurities from crude gas, and the separation is not complete (about 90%), and there is no beneficial follow-up treatment of these separated substances

[0011] 2. The separated tar wastewater needs to be poured out frequently, which not only causes secondary pollution to the air and soil, but also causes waste, because tar contains 5-15% of energy

[0012] 3. Although the dry purification system reduces the discharge of waste water, it can only separate impurity solid particles, and the effect of separating tar and water vapor is very poor. The crude gas purified by the dry purification system still contains more tar and water vapor. water vapor

[0013] 4. The gas cooker of the existing gasifier does not have the function of cracking tar. The gas purified by the existing purification device still contains a small amount of tar and water vapor. If the tar is burned directly without cracking, it will release a gas with an unpleasant smell and harmful to the human body. If the crude gas is not purified, it will be directly sent to the existing straw gasification stove Burning tools will aggravate the above situation

[0014] 5. Introducing the purified and separated tar wastewater directly into the oxide layer of the gasification generator will not crack the tar, but will only lead to an increase in the humidity of the fuel in the gasification generator, which will adversely affect the gasification efficiency and gas quality, leading to ignition Difficulty, Poor Burning

[0015] 6. The cost of catalytic cracking and decoking system is high, the temperature is difficult to control, and it is not suitable for small household straw gasifiers

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