Novel process for pyrolysis of solid wastes

A new process, pyrolysis technology, applied in pyrolysis treatment of sludge, sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of imperfect process, low treatment efficiency, secondary pollution, etc., and achieve saving Energy, simple processing steps, and the effect of saving operating costs

Inactive Publication Date: 2012-07-04
ZHONGCHANG ENVIRONMENT PROTECTION GROUP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention is aimed at the problem of high energy consumption or insufficient energy consumption in the existing pyrolysis treatment of solid waste with high water content and low calorific value, especially for

Method used

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  • Novel process for pyrolysis of solid wastes
  • Novel process for pyrolysis of solid wastes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, sludge with a moisture content of 67% after deep dehydration:

[0023] Because the sludge form is relatively uniform, it does not need to be pulverized in the early stage. 10 tons of sewage sludge with a water content of 67% is dried through the material receiving and conveying system (1) into the sludge drying system (3) (hollow rotary disc, hollow paddle dryer), and the water content of the sludge The rate is reduced to 25-30%, and the weight is about 4.4-4.71 tons. The dried sludge with 25-30% water content enters the sludge pyrolysis system (4) (the main equipment is a pyrolysis furnace) for pyrolysis treatment, and about 1.772 tons of organic carbon products (higher ash content) are obtained. The particles can be used In the construction of urban greening trees, the oil and gas (volatile matter) produced by pyrolysis are burned through the reburning system (5) to supply the energy required by the pyrolysis system (4). The high-temperature flue gas o...

Embodiment 2

[0027] Embodiment 2: sludge with a moisture content of 80%

[0028] 10 tons of sewage sludge with a water content of 80% will be dried through the material receiving and conveying system (1) into the sludge drying system (3) (partition-wall sludge dryers can be implemented), and the water content of the sludge will be reduced The rate is reduced to 25-30%, and the weight is about 2.67-2.85 tons. The dried sludge with 25-30% water content enters the sludge pyrolysis system (4) (the main equipment is the pyrolysis furnace) for pyrolysis treatment, and at the same time starts the crushing system (2) to crush 800kg of straw, and the crushing uses a separate feeder The material device is sent to the pyrolysis system (4), and the pyrolysis system (4) contains about 1.324 tons of organic carbon products. This organic carbon product can be used for urban greening and forestry construction. The system (5) burns for the energy required by the pyrolysis system (4). The high-temperature...

Embodiment 3

[0030] Embodiment 3: the technology of the pyrolysis of food waste

[0031] Food waste has the characteristics of high water content, high organic content, high oil content and high salt content. Its main components are starch, dietary fiber, animal fat, rich in protein, vitamins, edible oil and cellulose, and nutritious. Rich, with high recycling value, very suitable for resource reuse.

[0032] The high water content of food waste is generally above 60%. The food waste enters the crushing system (2) through the receiving and conveying system (1), and is crushed and sieved until the particle size is less than 2mm, and sent to the drying system (3) for drying and removal Moisture to reduce the moisture content to 25-30%, and then enter the pyrolysis system (4) through the feeding device. The pyrolysis temperature of food waste is determined to be 600°C. If the calorific value is low, additional biomass energy needs to be added to ensure normal operation of the system. After ...

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Abstract

The invention discloses a novel process for pyrolysis of solid wastes. According to the existing pyrolysis technology, the solid wastes with low calorific values and high moisture content are difficult to treat, and effects of being completely harmless, reduced and recycled cannot be achieved. The novel process provided by the invention comprises the following steps of: uniformly crushing the solid wastes by a crushing system and conveying the crushed solid wastes to a drying system to be dried; carrying out the pyrolysis in a pyrolysis system and treating a pyrolyzed product by a re-burning system to provide energy needed by the pyrolysis system; conveying high-temperature smoke into a residual heat boiler to generate saturated vapor with a temperature which is higher than 1000 DEG C; carrying out heat exchange on the vapor by a vapor-air heat exchanger; after raising the temperature of normal-temperature air, conveying the air into the vapor-air heat exchanger to carry out the heat exchange with output smoke of the residual heat boiler; conveying the hot air into the pyrolysis system and carrying out processes of cooling combustion smoke, de-acidifying and removing dust on the smoke of the residual heat boiler through an exhaust gas treatment system; receiving uncondensed gas in condensed odor vapor by the deodorization system, carrying out final treatment on the uncondensed gas and exhausting. According to the invention, the residual heat value of the high-moisture solid wastes is sufficiently utilized and the utilization is not limited by types of the solid wastes, so that the energy source and the operation cost are saved.

Description

technical field [0001] The invention belongs to the technical field of energy and environmental protection, and relates to a new process for pyrolysis treatment of solid waste. Background technique [0002] The goal of solid waste treatment is harmless, volume reduction, and recycling. Solid waste is the most difficult to dispose of among the "three wastes", because it contains quite complex components, and its physical properties (volume, fluidity, uniformity, degree of crushing, moisture, calorific value, etc.) are also ever-changing. It is relatively difficult to achieve the above-mentioned goals of "harmless, reduced, and resourceful" with technology. Currently, the main methods used include incineration, biological treatment, pyrolysis, and landfill. Among the above methods, pyrolysis is the most promising technology. However, pyrolysis has strict requirements on the moisture content of the treated waste, which is difficult to implement for low calorific value waste. ...

Claims

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Application Information

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IPC IPC(8): F23G5/027F23G5/04F23G5/033F23G5/46F23G5/44F22B1/18F22D1/06C02F11/00C02F11/12C02F11/10B01D53/76B01D53/78B01D53/72
CPCY02W10/40
Inventor 倪席平陈德珍黄园园
Owner ZHONGCHANG ENVIRONMENT PROTECTION GROUP
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