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System and method for treating domestic garbage and sewage sludge

A technology for domestic waste and sewage, which is used in the pyrolysis treatment of sludge, special forms of dry distillation, petroleum industry, etc. Improve productivity and quality, achieve clean emissions, and reduce operating costs

Pending Publication Date: 2017-12-26
BEIJING SHENYUAN ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Domestic garbage and sewage sludge in small and medium-sized cities and towns in my country generally have problems such as small output and scattered distribution. It is difficult to realize the co-processing of domestic garbage and sewage sludge with existing technologies, and the required processing scale cannot be achieved.

Method used

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  • System and method for treating domestic garbage and sewage sludge
  • System and method for treating domestic garbage and sewage sludge
  • System and method for treating domestic garbage and sewage sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Send the domestic garbage into the garbage crushing dryer and crush it to a particle size below 50mm, and use the waste heat supplied by the waste heat recovery device to dry the crushed garbage so that the moisture content is reduced from 48wt% to 40wt% (wt% is mass percentage), and the waste water generated is sent to the sewage evaporative concentrator for treatment.

[0056] The sludge is sent to the sludge dryer, and the waste heat supplied by the waste heat recovery device is used to reduce the water content from 75wt% to 40wt%, and the generated waste water is sent to the sewage evaporative concentrator for treatment.

[0057] The crushed and dried domestic garbage and sludge are sent to the mixing feeder to mix evenly, and then sent to the rotary bed pyrolysis furnace for pyrolysis. The rotary bed pyrolysis furnace is heated by regenerative radiant tubes, and the gas used in the radiant tubes is purified pyrolysis gas after treatment in the pyrolysis gas decokin...

Embodiment 2

[0071] The difference between this embodiment and embodiment 1 is:

[0072]The dried garbage and sludge enter the rotary bed pyrolysis furnace through two feeders respectively, and the sludge feeder is located in front of the garbage feeder, and the sludge feeding speed is twice the garbage feeding speed. The mass ratio of garbage to sludge is 1:2. After entering the rotary bed pyrolysis furnace, the effect of layered distribution of sludge and garbage is formed. Compared with Example 1, the yield of the pyrolysis gas in this example is increased by 2.6%, and the calorific value is increased by 1.17 times. The specific components of the purified pyrolysis gas are shown in Table 3.

[0073] Table 3 Components of Purified Pyrolysis Gas

[0074] components

Embodiment 3

[0076] The difference between this embodiment and embodiment 1, 2 is:

[0077] The dried garbage and sludge are firstly mixed evenly through the mixer, the mixing ratio of garbage and sludge is 1:3, and the mixed material enters the rotary bed pyrolysis furnace through the screw feeder for pyrolysis, and the generated pyrolysis gas The yield reaches 48.7%, and the calorific value reaches 4400kcal / kg. Specifically, the components of the purified pyrolysis gas are shown in Table 4.

[0078] Table 4 Components of Purified Pyrolysis Gas

[0079] components

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Abstract

The invention relates to a system and a method for treating domestic garbage and sewage sludge. In a pyrolysis unit of the system, a pyrolysis device is equipped with a feeding port, a pyrolytic oil gas outlet and a pyrolytic carbon outlet; in a pyrolytic oil gas treating unit, an oil gas separating device is equipped with a pyrolytic oil gas inlet, a pyrolytic gas outlet and a pyrolytic oil outlet; the pyrolytic oil gas inlet is connected with the pyrolytic gas outlet; an oil water separating device is equipped with a pyrolytic oil inlet, a tar outlet and a sewage outlet; the pyrolytic oil inlet is connected with the pyrolytic oil outlet; an evaporation device is equipped with a sewage inlet, a steam outlet and a sewage concentrated liquid outlet; the sewage inlet is connected with the sewage outlet; in a pyrolytic carbon treating unit, a cooling device is equipped with a pyrolytic carbon inlet, a water vapor inlet, a cooling pyrolytic carbon outlet and a water vapor outlet; the pyrolytic carbon inlet is connected with the pyrolytic carbon outlet; and the water vapor inlet is connected with the water vapor outlet. According to the invention, the pyrolytic gas, tar and pyrolytic carbon energy with high calorific value can be acquired, the yield is higher, the energy consumption of the system is lower and the running cost is lower.

Description

technical field [0001] The invention relates to the technical field of waste treatment, in particular to a system and method for treating domestic garbage and sewage sludge. Background technique [0002] With the expansion of cities and people's concern about environmental protection, how to effectively deal with the growing domestic waste and sewage sludge has become a crucial issue. At present, the annual output of domestic garbage in my country is about 250 million tons, and the annual output of sewage sludge is 30 million tons. Domestic garbage and sewage sludge contain a large amount of heavy metals (such as As, Cd, Cr, Hg, Pb, Cu, Zn, Ni), viruses, pathogenic bacteria, insect eggs and refractory toxic organic substances, if not treated in time, can easily cause serious secondary pollution to the environment. [0003] Regarding the disposal of domestic garbage and sewage sludge, the governments of various countries have clearly requested to follow the principles of redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/00C02F11/10
CPCY02W10/40C10B53/00C02F11/10
Inventor 任浩华张安强周跃男刘璐龙艳秋吴道洪
Owner BEIJING SHENYUAN ENVIRONMENTAL PROTECTION CO LTD
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