Sludge pyrolysis and gasification treatment process and sludge pyrolysis and gasification treatment system

Abstract

The invention relates to a sludge pyrolysis and gasification treatment process and a sludge pyrolysis and gasification treatment system, aiming at providing a process and a device which are used for treating sludge and are simple in technology, small in floor space, low in cost, safe and environment-friendly. The sludge pyrolysis and gasification treatment system device comprises a multi-stage furnace, a sludge dewatering machine, a waste heat boiler, a rear combustion chamber, a scrubber tower and a gas power generator; after being respectively dehydrated by the sludge dewatering machine and classified, the sludge and domestic garbage are conveyed into the multi-stage furnace for pyrolysis; the sludge and domestic garbage are fully pyrolyzed by controlling the temperature and the oxygen inlet amount of the multi-stage furnace, and solid-state products and gas-state products are obtained after pyrolysis. The solid-state products containing nitrogen and potassium are discharged outside and prepared into an organic fertilizer; the gas-state products containing nitrogen, sulfur, carbon and hydrogen sequentially pass through the rear combustion chamber, the waste heat boiler, a bag-type dust collector and the scrubber tower, so that the harmful gases, moisture and granule impurities in the gas-state products can be removed, and the combustible gases such as methane, acetylene and ethane can be finally obtained; the gas power generator can be filled with obtained combustible gases for generating electricity.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a sludge pyrolysis gasification treatment process and a sludge pyrolysis gasification treatment system. Background technique [0002] At present, there are two main domestic sludge treatment technologies: sludge anaerobic digestion technology and sludge composting technology. [0003] Sludge anaerobic digestion technology refers to the process of decomposing biodegradable organic matter in sludge into carbon dioxide, methane and water by facultative bacteria and anaerobic bacteria under anaerobic conditions to stabilize sludge , is one of the commonly used methods for sludge reduction and stabilization. At present, many sewage treatment plants in China have set up sludge anaerobic digestion treatment facilities, but not many are still in normal operation. The reasons: firstly, the sludge anaerobic digestion technology requires a large investment, and there is not much experience...

AI Technical Summary

Problems solved by technology

Thirdly, the sand content of sludge in my country is relatively high, the content of organic matter is lower than that of European and American countries, the biodegradability of sludge is poor, the stability of digestion equipment operation, biogas production rate and other indicators are generally not up to foreign standards, so in China The digestion technology commonly used in foreign countries does not work well in my country, so it is difficult to promote and popularize it

Although the investment cost of aerobic composting of sludge is relatively low, it has disadvantages that cannot be ignored: (1) sludge composting is easily affected by the weather; (2) covers a relatively large area; The cycle is 18 to 24 days, and the dynamic composting cycle is 10 to 14 days, so it is not suitable for sludge treatment in large sewage treatment plants; (4) Most of them are open composts, and the problem of odor cannot be solved, and the project site selection is very difficult; (5) ) Because of the enrichment of heavy metals, the market of sludge compost fertilizer is not good; (6) Only the remaining part of organic matter after aerobic reaction is used, and a large amount of organic matter is converted into gas, which is not utilized, and the resource utilization is not realized to the maximum extent

Images