CN103361090A - Method for preparation of tar by microwave pyrolysis of kitchen garbage - Google Patents

Abstract

The invention discloses a method for preparation of tar by microwave pyrolysis of kitchen garbage. The specific process comprises: firstly subjecting the kitchen garbage to a dehydration treatment, then drying it for 5h at 90DEG C; putting the dried kitchen garbage into a microwave pyrolysis reactor, then placing the reactor into a microwave pyrolysis furnace, and performing microwave pyrolysis under a nitrogen atmosphere; making the pyrolysis gas pass through a first-stage condensing device, collecting the condensation product; and separating the upper tar after the liquid product undergoes layering. The method has no need of grinding the kitchen garbage and adding a microwave absorbent, the operation is simple and convenient, the kitchen garbage reduction effect is good, the generated solid residue and non-condensable gas are both available resources, and there exists no secondary pollution. Thus, the method opens up a new approach for harmless, reducing and resourceful treatment of the kitchen garbage.

Description

A kind of method of utilizing the microwave cracking rubbish from cooking to produce tar

Technical field

The present invention relates to rubbish from cooking and produce tar technique, relate in particular to a kind of method of utilizing the microwave cracking rubbish from cooking to produce tar.

Background technology

Along with day by day increase and the urban population expansion of China's city size, the annual emissions of domestic waste is just increasing progressively with the speed of 8-10%, and the annual emissions of China's domestic waste is above 200,000,000 tons at present.Domestic waste sharply increase has brought problems, as: restrict Sustainable development, affect waste management and pollute environment for human survival etc.In numerous municipal solid waste classifications, rubbish from cooking is maximum, often accounts for more than 50% of rubbish total amount.The rubbish from cooking that quantity is huge, not only its processing problem allows social headache endlessly, and thus association the varieties of food items safety problems such as " sewer oil ", " rubbish pig ".

Rubbish from cooking is rich in organism, and water ratio is high, and is perishable, easily grows pathogenic micro-organism, mycotoxin etc.At present, main processing mode has landfill, burning, fodder processing, compost etc.All there is certain shortcoming in various treatment processs, and wherein landfill method can produce a large amount of biogas and ooze drop liquid, causes serious secondary pollution, but also can take a large amount of soils; Burn rule because the rubbish from cooking moisture content is high, bring difficulty to burning disposal, also can produce dioxin and cause serious environmental pollution; Fodder is processed and is had serious potential safety hazard; The compost rule exists long processing period, high in cost of production shortcoming.

Tar is a kind of important industrial chemicals, separablely goes out multiple product, and for example how, pitch, phenol, anthracene etc., these products are widely used in the industry-by-industry producing, live.In addition, can Partial Replacement gasoline after modified by tar processed, diesel oil or kerosene, and as the raw material of engine; Tar mixes by a certain percentage with diesel oil, and the substitute that also can be used as diesel oil is used.At present, tar mainly produces in the carbonization of coal process, yet coal is Nonrenewable resources.

Therefore, a kind ofly can process the method that rubbish from cooking can prepare again tar in the urgent need to developing.

Summary of the invention

The object of the invention is to overcome the shortcoming and defect of prior art, provide simple, the cheap microwave cracking rubbish from cooking of utilizing of a kind of technique to produce the method for tar.

The present invention is achieved through the following technical solutions

A kind of method of utilizing the microwave cracking rubbish from cooking to produce tar, following steps:

(1) rubbish from cooking is carried out processed after, under 90 ℃ temperature dry 5 hours, make its water ratio＜5%; The rubbish from cooking of the drying microwave cracking reactor of packing into is reacted, put into the microwave cracking stove; After passing into nitrogen 20min, the beginning heating pyrolyze, reaction is carried out under oxygen free condition;

(2) with the volatile matter process one-level condensing works of above-mentioned reaction, collect condensed product in receiving flask;

(3) incoagulable gaseous product is collected with collecting bag;

(4) temperature of rubbish from cooking is reached more than 500 ℃, stopping cracking when producing without gas, liquid;

(5) stop cracking 5min clock after, the product liquid in the receiving flask is divided into two-layer, the upper strata is tar, lower floor is the weakly alkaline liquid of reddish-brown, and the upper strata tar separation is gone out to pack in the oil storage bottle.

Present method does not need kitchen waste crushing and adds microwave absorption, simple to operation, kitchen waste reduction is effective, the solid residue and the incondensable gas that produce also all are available resources, non-secondary pollution,, minimizing innoxious for rubbish from cooking, recycling treatment open up a new way.

Description of drawings

Fig. 1 is reparation technology schema of the present invention.

Embodiment

Below in conjunction with specific embodiment the present invention is done further concrete detailed description the in detail.

Embodiment 1:

With the rubbish from cooking of the drying microwave cracking reactor of packing into, then, put into the microwave cracking stove.After passing into nitrogen 20min, open the microwave cracking stove, the size of microwave power is the 13.33W/g setting according to its ratio with rubbish from cooking.The rubbish from cooking top temperature is 659 ℃ in the cracking process, powered-down during substantially without gas, liquid generation, the microwave cracking stove 12.50min that works altogether, the yield of the relative rubbish from cooking of tar that produces is 20.30%, the yield that produces the relative rubbish from cooking of carbon residue is 35.53%, and the yield that produces the relative rubbish from cooking of inflammable gas is 28.73%.

Embodiment 2:

The present embodiment is except following characteristics, and other features and example 1 are basic identical.

The increased power of microwave cracking stove is 16.67W/g.The rubbish from cooking top temperature is 782 ℃ in the cracking process, 9.20min consuming time, and the yield of the relative rubbish from cooking of tar of generation is 15.00%, and the yield that produces the relative rubbish from cooking of carbon residue is 33.73%, and the yield that produces the relative rubbish from cooking of inflammable gas is 37.17%.

Embodiment 3:

The present embodiment is except following characteristics, and other features and example 1 are basic identical.

The increased power of microwave cracking stove is 20.00W/g.The rubbish from cooking top temperature is 844 ℃ in the cracking process, 5.90min consuming time, and the yield of the relative rubbish from cooking of tar of generation is 18.90%, and the yield that produces the relative rubbish from cooking of carbon residue is 32.13%, and the yield that produces the relative rubbish from cooking of inflammable gas is 39.27%.

The tar of gained in above-described embodiment, density are 0.96 * 10 ³Kg/m ³, through the GB/T384-1996 standard detection, superior calorific value is 32.33MJ/Kg.

Embodiments of the present invention are not restricted to the described embodiments; other are any not to deviate from change, the modification done under spirit of the present invention and the principle, substitute, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.

Claims (1)

1. a method of utilizing the microwave cracking rubbish from cooking to produce tar is characterized in that comprising the steps:

(1) rubbish from cooking is carried out processed after, under 90 ℃ temperature dry 5 hours, make its water ratio＜5%; The rubbish from cooking of the drying microwave cracking reactor of packing into is reacted, put into the microwave cracking stove; After passing into nitrogen 20min, the beginning heating pyrolyze, reaction is carried out under oxygen free condition;

(2) with the volatile matter process one-level condensing works of above-mentioned reaction, collect condensed product in receiving flask;

(3) incoagulable gaseous product is collected with collecting bag;

(4) temperature of rubbish from cooking is reached more than 500 ℃, stopping cracking when producing without gas, liquid;

(5) stop cracking 5min clock after, the product liquid in the receiving flask is divided into two-layer, the upper strata is tar, lower floor is the weakly alkaline liquid of reddish-brown, and the upper strata tar separation is gone out to pack in the oil storage bottle.