Municipal refuse pyrolysis

Figure 3. Energy balance of municipal refuse pyrolysis unit (X 106 Kcal/hr)...

Preston, G.T., Resource Recovery and Flash Pyrolysis of Municipal Refuse, in Symposium Papers Clean Fuels from... 

Table V. Composition of the Eluates of Pyrolysis Slag from Experiments with Municipal Refuse...

In short it can be stated that the pyrolysis of 100 kg of municipal refuse, predried to a water content of 18 % by weight and having a calorific value of 8370 kJ/kg and to which 77.6 kg of air have been added, produces in the two-stage plant an average of... 

Figure 7. Outline of the material balance for the pyrolysis of municipal refuse in the two-stage Kiener System...

In option 2, municipal refuse will be size-reduced by a crusher and fed into the converter. Oxygen will be supplied to the converter and municipal refuse will be dried, pyrolyzed and melted at high temperature. Pyrolysis gas will be directly combusted in the combustor, where waste water will be evaporated and oxidized. Energy will be recovered in the form of steam by a waste heat boiler and electric power will be generated. Lime will be applied to absorb hydrogen chloride and sulfur oxides in the flue gas. Slag may be used for the construction of roads, etc.. 

Combustible Gas, Component of the combustible gas which is produced by pyrolysis of municipal refuse is shown in Table-V. 

Pyrolysis of Pulp and Paper Sludge. The filter cake containing about 80% moisture was supplied for the cracking reactor without predrying. Heavy oil was fed to the incinerator as the auxiliary fuel. This is different from the case of municipal refuse, but the combustible gas composition and calorific value, flue gas composition and ash were similar to that of municipal refuse. The chemical analysis of combustible gas and flue gas are shown in Tables IX and X. 

The first commercial plant of the dual fluidized bed pyrolysis process with a capacity of 450 ton/day (150 ton/day x 3 series) is now under construction and is scheduled to commence operation in October 1980 for disposal of municipal refuse in Funabashi City, near Tokyo, The outline of this plant is as follows. 

In the two-bed pyrolysis system , fluidized fine solids circulate between a reactor to pyrolyze municipal refuse and an incinerator to burn up the produced char. 

A Preliminary Economic Feasibility of the System. An economic feasibility for a proto-plant of 300 T/D in capacity can be estimated as follows By pretreating municipal refuse of 300 T/D, the input of the pyrolysis system is estimated to be about 83 T/D, assuming the total system is similar to that of the demonstration plant (100 T/D). The working period of the system is assumed to be 3 months continuously on three shift operation by 21 men, shift detail of which will be as follows ... 

Construction of Gasifier. The construction of the pyrolysis furnace, the heart of the pyrolysis-incineration system for municipal refuse is shown in Figures 2 and 3, It is a shaft furnace with a rotary grate on the bottom and a refuse feeding hopper at the top. The air and steam for the water-gas reaction are supplied through the rotary grate. 

Co-disposal of Scrap Tire and Refuse. The experiment was carried out with shreded tires mixed with municipal refuse. The composition of the samples of produced gases from pyrolysis furnace are as shown in Table VI. 

For pyrolytic disposal of municipal refuse in Japan, therefore, preference may be given to the pyrolysis-incineration system, which, with its low-pollution feature, allows on-the-spot conversion of the produced gas into thermal energy — this system is preferred until there should be a radical improvement in the quality of municipal refuse in our country. 

In Table VII, which deals with a system for using the thermal energy obtained through pyrolysis-incineration of municipal refuse to produce steam for power generation, calculated data on the quantity of steam produced, the rate of power generation and the power requirements of the plant are shown ... 

In this paper, I have tried to acquaint you with our newly developed pyrolysis-incineration system for the disposal of municipal refuse in Japan. 

Corey, R. C., "Pyrolysis, Hydrogenation and Incineration of Municipal Refuse", Proceedings of the second Mineral Waste Utilization Symposium, Illinois Institute of Technology, Chicago, March 1970... 

Polyolefin wastes can be pyrolyzed alone or in mixtures with other materials, especially if found in industrial or municipal refuse. The quality of waxes may be improved by introduction in the pyrolysis reactor of steam, inert gas, air, oxygen, or ozone flow, or by extraction of the low molecular weight products [327, 328, 348, 349]. In this manner the olefin content is reduced and the color and odor are eliminated. They... 

On the basis of these circumstances, the need for a better solid waste disposal system has stimulated a great deal of interest in the application of pyrolysis to solid wastes instead of the traditional incineration system in our country. Since the Agency of Industrial Science Technology, MITI had launched the national project on development of technology and system of resource recovery from refuse in 1973, more than a dozen processes of PTGL are being developed at the national level, municipal level, and the level of private companies as shown in Table I. 

Another application of OEC to overcome thermal limitations is in thermal pyrolysis of municipal solid waste or refuse-derived fuel (RDF).3 The N2 in air... 

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