Biological oil-coal slurry and method for preparing gas from same

Abstract

The invention discloses biological oil-coal slurry. The biological oil-coal slurry is prepared by stirring or grinding and mixing pulverized coal and biological oil according to a certain proportion, wherein the pulverized coal accounts for 20-80 parts by weight, and the biological oil accounts for 20-80 parts by weight. The invention also discloses a method for preparing gas, which comprises the following steps of: (1) mixing pulverized coal with biological oil according to a certain proportion, wherein the pulverized coal accounts for 20-80 parts by weight, and the biological oil accounts for 20-80 parts by weight, adding additive, and stirring to obtain biological oil-coal slurry; (2) atomizing the prepared biological oil-coal slurry by a delivery pump through a delivery pipeline and an atomizing nozzle, charging into a gasification furnace, carrying out pyrolysis, gasification and combustion reaction on the atomized biological oil-coal slurry and the charged gasification agent in the gasification furnace; and (3) obtaining the reacted gas which is rough gas and discharging residues formed in reaction at the bottom of the gasification furnace in a liquid stata. The invention can realize the common gasification of the biological oil and coal.

Description

Technical field [0001] The invention relates to the field of biomass energy, in particular to a biological oil-coal slurry and a method for preparing coal gas. Background technique [0002] Biomass is a widespread and abundant renewable energy. Compared with fossil fuels, biomass is an energy with low energy density and dispersed raw materials. Although biomass gasification technology is relatively mature, if it is used to produce hydrogen Or synthesis gas, it is difficult to achieve large-scale production due to difficulties in raw material collection and transportation. In addition, biomass gasification is mostly carried out under high temperature and high pressure conditions, which brings problems such as difficulty in feeding under pressure, slagging caused by ash melting, and high temperature corrosion of alkali metals and halides. To solve the problem, moreover, the gas obtained from the direct gasification of biomass is not pure enough, which will bring inconvenience to t...

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Problems solved by technology

Among them, the most representative and advanced processes are Shell with dry coal powder as raw material and Texaco gasifier process with coal water slurry as raw material. The slurry is 15% lower; the carbon conversion rate is high, up to 99%, and the coal consumption is 8% lower than that of coal water slurry; it is convenient to adjust the load, and the load is reduced by 50% by closing a pair of nozzles; the furnace lining is a water-cooled wall, and its service life is said to be 20 years, and the life of the nozzle is 1 year. The main disadvantage is that the investment in equipment is greater than that of coal-water slurry gasification technology, the life of the nozzle is too short, the structure of the gasifier and waste heat boiler is too complicated, and the processing difficulty is increased.

The Texaco gasifier adopts coal-water slurry as feed material, and the preparation and transportation of coal-water slurry is simple, safe and reliable; the localization rate of equipment is high, and the investment is low. The main disadvantage is that the pulping concentration of different coal types is different. Therefore, its The scope of adaptation to coal types is relatively lower than that of Shell gasifiers; on the other hand, because the water in the gasified coal slurry consumes 8% of the coal fed into the furnace, the oxygen consumption is 12% to 20% higher than that of dry coal powder as raw material. Therefore, the efficiency is relatively low, and the calorific value of the raw material is low due to the large amount of water contained in the coal-water slurry. Therefore, the gasifier of the coal-water slurry should not use a water-cooled wall but a refractory material layer. The refractory material layer has a limited life and cannot be used for a long time. In addition, coal with low ash and low melting point should be used as raw material and operated at high temperature. Although the gasification intensity and gas quality are high, the oxygen consumption is high.

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