Biogas engineering biogas slurry solid-liquid separation system and control mode

Abstract

The invention relates to a biogas engineering biogas slurry solid-liquid separation system. The system comprises an anaerobic discharge pump, a first roller screw dehydrator, a second roller screw dehydrator, a stacked screw dehydrator, a returning pump, a biogas residue temporary storage tank stirrer, a first biogas slurry temporary storage tank, a second biogas slurry temporary storage tank, a third biogas slurry temporary storage tank, a biogas residue temporary storage tank, a biogas slurry storage tank, adjusting valves, a liquid level meter and a control center. An outlet of the anaerobic discharge pump is respectively connected to an inlet of the first roller screw dehydrator, an inlet of the second roller screw dehydrator and an inlet of the biogas residue temporary storage tank through the adjusting valves, a biogas residue outlet of the first roller screw dehydrator is connected to an organic fertilizer preparation system through a belt conveyor, and a biogas slurry outlet ofthe first roller screw dehydrator is connected to an inlet of the first biogas temporary storage tank. The method has the beneficial effects that through parallel cooperation of the first roller screw dehydrator and the other solid-liquid separation process, organic fertilizer preparation, biogas slurry returning and membrane treatment and biogas residue recycling treatment are achieved, and thetwo process routes are implemented in a matched mode.

Description

technical field [0001] The patent relates to a biogas engineering biogas slurry solid-liquid separation system and a control method, and belongs to the technical field of biogas engineering biogas slurry treatment. Background technique [0002] In the biogas project, organic wastes undergo centralized anaerobic fermentation at medium temperature and humidity to produce a large amount of biogas slurry, which is characterized by high solid content, high viscosity and fine particles. There are many ways to use biogas slurry, including returning to the field, biochemical treatment, membrane concentration treatment, aerobic fermentation to prepare organic fertilizer, etc., as well as the biogas residue recycling treatment developed by our company, among which returning to the field is the most economical. However, according to the "Technical Specifications for Returning Livestock and Poultry Manure to the Field" (GB / T 25246), there are limits to the use of wheat, rice, orchards a...

AI Technical Summary

Problems solved by technology

[0004] At present, due to the completely different solid content required for returning to the field, biochemical treatment, membrane concentration treatment and biogas residue recycling treatment, a single screw extruder, stacked screw dehydrator, centrifuge, and plate and frame filter press are usually used. It is difficult for solid-liquid separators such as solid-liquid separators to meet the requirements of diversified biogas slurry treatment methods

If a variety of solid-liquid separators are used together, it is difficult to meet the ideal requirements in terms of applicability and economy, and the control method becomes very complicated, which eventually leads to the failure of the solid-liquid separation system

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