A method for preparing high-purity biomass methane by purifying biogas slurry
A biomass, high-purity technology, applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of biogas slurry discharge, achieve the effect of increasing the calorific value of biogas, reducing consumption, and solving the effects of poor biodegradability
Active Publication Date: 2017-02-08
GUANGXI UNIV
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a method for producing high-purity biomass methane by purifying biogas slurry, which solves the environmental problems caused by biogas slurry discharge while producing high-purity biomass methane and increasing the calorific value of biogas
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Embodiment 1
[0024] The PH value of the biogas slurry in a biogas fermentation pond in eastern Guizhou is 6.9-7.2; the contents of nitrogen, phosphorus, potassium, copper, iron and organic matter in the biogas slurry are: 0.687g / kg, 0.044g / kg, 0.421g / kg, 0.29mg / kg, 2.11 mg / kg and 217.81 g / kg. Proceed as follows:
[0025] (1) The biogas slurry from the biogas fermentation tank is filtered with a 200-mesh stainless steel screen for solid-liquid separation, and at the same time removes some nutrients and heavy metals such as nitrogen, phosphorus, potassium, copper, iron, zinc, and a certain amount of organic matter;
[0026] (2) The biogas slurry filtered in step (1) enters the settling tank for sedimentation, and the sedimentation time is 2h to 3h, so that the suspended matter settles down, and then the biogas slurry is 180m 3 The flow rate of / h is pumped from the upper part of the water washing tower to the water washing tower as an adsorbent to absorb CO in the biogas 2 and H 2 S;
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Abstract
The invention discloses a method for purifying and preparing high-purity biomass methane by using biogas slurry. The method comprises the following steps that firstly, a 200-mesh stainless steel screen is used for filtering the biogas slurry, then, the filtered biogas slurry enters a settling pond to be settled, so that the quantities of ammonia, nitrogen and phosphorus substances in the biogas slurry are reduced, and then the settled biogas slurry is delivered into a water scrubbing tower to be used as an adsorbent; after biogas is filtered by a filter, the biogas is pressurized to 1MPa by a compressor, the pressurized biogas enters the water scrubbing tower to be in countercurrent contact with the processed biogas slurry, and the biogas slurry absorbs CO2 (carbon dioxide) and H2S (hydrogen sulfide). Through the adoption of the method disclosed by the invention, the volume concentration of CH4 (methane) in the purified biogas is greater than 88%, the volume fraction of the CO2 is smaller than 10%, and the calorific value of the biogas is increased. Through the adoption of the method, not only the consumption of running water is reduced, but also the environmental problem that the biodegradability of the biogas slurry is poor, so that if the biogas slurry is discharged at random, the eutrophication of lakes and rivers, the pollution to soil and groundwater and the like can be caused, is solved.
Description
technical field [0001] The invention relates to a method for preparing high-purity biomass methane by purifying biogas slurry. Background technique [0002] With the rapid development of the economy, my country's demand for natural gas energy is also increasing. According to relevant data, the national natural gas production in 2009 was 85.269 billion m 3 , with a consumption of 88.7 billion m 3 , the gap between supply and demand is as high as 3.4 billion m 3 . According to the report "Research on China's Sustainable Development Oil and Gas Resources Strategy", by 2020, China's annual demand for natural gas will reach 250 billion m 3 , the gap will reach 90 billion m 3 . Biogas is a kind of high-quality renewable biomass energy, which has the characteristics of good anti-knock performance and clean combustion products, and its calorific value is about 20MJ / m 3 ~25MJ / m 3 . After the biogas is purified, it can be made into high-purity biomass methane, and the calorif...
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IPC IPC(8): C10L3/10
Inventor 唐弓斌黄福川胡雄风
Owner GUANGXI UNIV