Coarse stalk fuel gas purification process and purification device thereof

Abstract

The invention discloses a coarse stalk fuel gas purification process, which comprises the following steps of (1) pretreating the coarse stalk fuel gas; (2) introducing the gas treated in the step (1)into a lower section of a transverse pipe sub condenser to be washed for dust removal; removing carbon particle dust, wood tar and water in the coarse stalk fuel gas; (3) introducing the gas treated in the step (2) into an upper section of the transverse pipe sub condenser to be condensed; removing wood vinegar and rest water; (4) performing further condensation removal on the gas treated in the step (3) through a filter to obtain purified stalk fuel gas. The invention also provides a purification device of the process. The gas effective purification of coarse stalk fuel can be realized; byproducts such as the carbon powder the wood tar and the wood vinegar can be obtained; the requirements of energy saving, environment protection and safety can be sufficiently met.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a crude straw gas purification process and a purification device thereof. Background technique [0002] Straw (granule) low-temperature-slow carbonization technology can carbonize straw (granule) while retaining the organic content of straw to the maximum extent. The straw carbon produced by this technology can be used as a fertilizer substrate to realize efficient and harmless return of straw to the field. A new way of fertilizer utilization of straw. [0003] The amount of coarse straw gas produced during the carbonization of straw (particles) accounts for about 70% of the total carbonization feed. The rational use of this part of the gas is the key to the carbonization of straw (particles) meeting the requirements of low carbon, energy saving and environmental protection for biomass resource utilization. . At present, most carbonization processes refer to th...

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Problems solved by technology

[0004] 1. The high-temperature straw gas coming out of the settling chamber of the carbonization furnace is directly cooled and dust-removed through the circulating washing tower, without considering the waste heat utilization measures, which does not meet the energy-saving requirements;

[0005] 2. In order to ensure the efficiency of dust removal and decondensation, multi-stage circulating scrubbers and multi-stage cooling measures are usually installed. The process is complicated and the number of equipment is increased, which leads to an increase in the system failure rate and is not conducive to stable operation;

[0006] 3. After the coarse straw gas is dedusted and cooled by the circulating washing system, the carbon dust and condensable components contained in it are transferred to the washing liquid. During the cooling and sedimentation process of the washing liquid, the carbon dust absorbs wood tar and other substances to form asphalt-like Viscous substances, which seriously pollute the washing liquid and easily block pipelines and equipment, resulting in many unstable factors;

[0007] 4. Due to the transfer of wood tar, wood vinegar, etc. into the washing liquid, the circulating washing liquid has a strong pungent smell. The current plan does not do airtight treatment, and the on-site smell is relatively large, which does not meet the requirements of industrial hygiene;

Based on these two reasons, the current coarse straw gas purification system will produce a large amount of sewage, which does not meet the environmental protection requirements;

[0009] 6. Due to the high temperature and low pressure of the coarse straw gas, in order to ensure its smooth passage through the washing and purification system, an induced draft fan is usually added at the end of the system, causing the entire purification system to be in a slightly negative pressure state, posing a safety hazard

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