Method for improving straw pyrolysis gasification gas quality and gasification efficiency by biogas slurry stack retting preprocessing
A technology of pretreatment and biogas slurry, which is applied in the fields of biofuel, special dry distillation, petroleum industry, etc., can solve the problems of high cost, high energy consumption, low efficiency, etc., and achieve the increase of porosity, reduction of gasification tar content, and operation simple effect
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Embodiment 1
[0032] (1) Biogas slurry stack retting pretreatment: Weigh 1 kg of crushed and sieved naturally air-dried corn stalks, put it in a 20L jar, add 9L of biogas slurry (solid-to-liquid ratio 1:9), so that the relative humidity of the mixture is 90 %; Add 20g of urea, adjust the C / N of the pretreatment system to 25; stir the mixed pretreatment system evenly, seal it with a rubber stopper, and let it stand in a water bath at 35°C for 1d; take out the corn stalks of the mixed system, and filter with a vacuum pump until there is no obvious The droplets flow out, and the corn stalks after suction filtration are dried in an oven at 105° C. to obtain straw powder. The basic operation process is attached figure 1 shown. The properties of biogas slurry for pretreatment are shown in Table 1. The scanning electron microscope and X-ray diffraction patterns of corn stalks before and after pretreatment are shown in the attached image 3 and attached Figure 4 . Such as image 3 As shown, ...
Embodiment 2
[0038] This example uses the same method and steps as in Example 1, but the amount of straw in the biogas slurry pretreatment is 5kg, the amount of biogas slurry added is 20L (solid-to-liquid ratio 1:4), and the amount of urea added is 100g. The humidity is 80%, and the water bath is kept at 35°C for 2 days.
[0039] The calorific value of the gasification gas prepared in this example is 6.18MJ / Nm 3 , the tar content is 3.17g / Nm 3 , the gasification efficiency is 66.00%. Compared with unpretreated corn stalks, the calorific value of gas is increased by 0.63MJ / Nm 3 , the tar content decreased by 3.24g / Nm 3 , the reduction range reaches 50.55%, and the gasification efficiency increases by 11.13%.
Embodiment 3
[0041] This example uses the same method and steps as in Example 1, but the amount of straw in the biogas slurry pretreatment is 2kg, the amount of biogas slurry added is 4.67L (solid-to-liquid ratio 3:7), and the amount of urea added is 40g. The relative humidity is 70%, and the water bath is kept at 35°C for 3 days.
[0042] The calorific value of the gasification gas prepared in this example is 6.42MJ / Nm 3 , the tar content is 3.06g / Nm 3 , the gasification efficiency is 67.22%. Compared with unpretreated corn stalks, the calorific value of gas is increased by 0.87MJ / Nm 3 , the tar content is reduced by 3.35g / Nm 3 , the reduction range reaches 52.26%, and the gasification efficiency increases by 12.35%.
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