CN2585051Y - Rotary hearth type municipal waste pyrolysis gasification incineration treatment device - Google Patents

Abstract

The utility model discloses rotary hearth type municipal refuse pyrolysis gasification incineration treatment device relates to the environmental protection field. The method is directly applied to the incineration treatment of garbage in middle and small cities and the utilization of waste heat power generation, and the smoke gas reaches the emission standard. A rotary hearth type city garbage pyrolyzing and gasifying incineration treating apparatus is composed of rotary kiln and afterheat boiler, and features that the rotary kiln is combined with afterheat boiler with vertically arranged long-flow secondary combustion chamber via narrow moving grate. The utility model discloses a according to the novel process equipment of china's national conditions development, adopt rotary hearth structural style and fractional combustion technique to realize the technological process of rubbish pyrolysis gasification, clean burning, engineering cost only is equivalent to 1/3 ~ 1/4 of import price, is fit for popularizing and applying in china completely.

Description

Rotary hearth type municipal waste pyrolysis gasification incineration treatment device

Field

The utility model relates to a rotary hearth type municipal garbage pyrolysis gasification incineration treatment device, which relates to the field of environmental protection. It is directly applied to waste incineration treatment and waste heat power generation utilization in small and medium-sized cities, and the flue gas discharge meets the standard.

Background technique

From a global perspective, waste incineration has become one of the main means of volume reduction, harmlessness and resource utilization of urban waste. Will exist as one of the main processing technologies. There are four main types of waste incinerators: active grate incinerator; rotary incinerator; fluidized bed incinerator and gasification incinerator.

Contents of the invention

The purpose of the utility model is to provide a waste incineration treatment device which is suitable for the national conditions and can be thoroughly and cleanly incinerated, and can generate steam to generate electricity by using waste heat, which is low in localization cost and easy to popularize and apply.

The utility model can be realized through the following technical solutions: a rotary hearth type urban waste pyrolysis gasification incineration treatment device, which has an incineration device, and is characterized in that the incineration treatment device is composed of a rotary kiln and a waste heat boiler. The mobile grate is combined with a waste heat boiler with a vertically arranged, long flow secondary combustion chamber. The organic combination of rotary kiln and waste heat boiler constitutes a new type of waste incineration treatment device. The garbage in the rotary kiln gradually completes the drying, pyrolysis gasification and partial combustion process under the condition of insufficient oxygen and medium temperature, and then enters the narrow mobile grate and the second combustion chamber. The narrow mobile grate is used as the post-combustion section of the rotary kiln and has a The secondary combustion chambers arranged vertically and with a long flow are organically combined.

Wherein, the waste heat boiler is composed of a narrow moving grate, a secondary combustion chamber, a membrane water wall, a superheater, an economizer, and a steam drum, and adopts an angle tube structure.

The rotary kiln is a slow-rotating kiln body made of steel, lined with a refractory material layer, and arranged in an inclined manner, including a garbage feeding hopper, a pusher, a primary tuyere, a kiln outlet and a narrow kiln. type mobile grate connection.

The difference between the utility model and the conventional boiler is that it has a horizontally arranged narrow moving grate as the post-combustion section of the rotary kiln and has a vertically arranged secondary combustion chamber with a long process flow. With an appropriate amount of hot air, the residues falling from the kiln mouth continue to burn out on the grate. The combustible gas produced by pyrolysis and gasification in the kiln is fully combusted and heat-exchanged in the secondary combustion chamber at an appropriate amount of secondary air ratio, and at the same time, the formed dioxin poisons are completely decomposed in this high-temperature zone. The high-temperature flue gas flows through the superheater and the economizer in turn. After the heat exchange process is completed and the temperature is lowered, it is discharged into the subsequent process from the outlet flue, and finally the clean flue gas is discharged into the atmosphere from the chimney.

The advantage of the utility model lies in that the device is a new type of process equipment developed according to my country's national conditions, and adopts the structure of the rotary hearth and the staged combustion technology to realize the technological process of pyrolysis gasification and clean combustion of garbage, and the project cost is only equivalent to imported 1/3 to 1/4 of the price, completely suitable for popularization and application in our country.

Description of drawings

Accompanying drawing 1, the structural representation of the utility model.

Accompanying drawing 2, the working principle diagram of the utility model.

Detailed ways:

As shown in Fig. 1, the structural diagram of the utility model, wherein, the rotary kiln 4 is a cylinder body welded by a steel plate, lined with refractory material, arranged in an inclined manner, and rotates at a slow speed. The feeder 2 is pushed into the kiln, stirred and turned with the rotation of the kiln, the air volume entering is controlled by the primary tuyere 3, and the drying, pyrolysis gasification and partial combustion processes are gradually completed under the condition of low oxygen and medium temperature. The charcoal-based solid residue at the kiln outlet falls into the narrow moving grate 5 of the post-combustion section.

Narrow mobile grate 5, secondary combustion chamber 8, membrane water wall 9, superheater 10, economizer 11, and steam drum 12 form a waste heat boiler, which adopts an angle tube structure. It differs from conventional boilers in that it has a (1×6m) horizontally arranged narrow grate as the post-combustion section of the rotary kiln and a vertically arranged secondary combustion chamber 8 with a long process flow. With an appropriate amount of hot air, the residues falling from the kiln mouth continue to burn out on the grate. The combustible gas produced by pyrolysis and gasification in the kiln is fully combusted and heat-exchanged in the secondary combustion chamber under an appropriate amount of secondary air 7 ratio, and at the same time, the formed dioxin poisons are completely decomposed in this high-temperature zone. The high-temperature flue gas flows through the superheater 10 and the economizer 11 in turn. After the heat exchange process is completed and the temperature is lowered to about 200°C, it is discharged into the subsequent process from the outlet flue 13, and finally the clean flue gas is discharged into the atmosphere from the chimney.

The device in this embodiment is a new type of process equipment developed according to my country's national conditions. It adopts the rotary hearth structure and staged combustion technology to realize waste heat power generation of waste pyrolysis gas.

As an application example, the utility model can realize waste heat power generation. Its scale and main parameters are:

Garbage treatment production line: 2

Daily processing of urban mixed waste: 2×150 tons/day

Rotary kiln: 2, outer diameter 3.32 meters, length 15 meters

Boiler narrow mobile grate: 2 pieces, 1×6m

Boiler steam parameters: 2.5Mpa, 350°C

Evaporation capacity: 2×28 tons/hour

Generating power: 2×3000kW

As shown in Fig. 2, the working principle diagram of the utility model, the industrial waste is first roughed and crushed, and then enters the mixed waste storage together with domestic waste, enters the rotary kiln 4 from the pusher 2, and enters the secondary combustion of the waste heat boiler after preliminary combustion treatment. On the chamber 8 and the grate 5, the ash is discharged from the slag extractor 6 and then landfilled. The steam is used for the turbine generator set to generate electricity. The flue gas is purified by a semi-dry purification tower and then discharged from the outlet flue 13 through a bag filter. , solidify the solid ash.

Claims (3)

1. A rotary hearth type urban waste pyrolysis gasification incineration treatment device, with an incineration device, characterized in that: the incineration treatment device is composed of a rotary kiln and a waste heat boiler, and the rotary kiln is connected with a narrow movable grate Combination of waste heat boilers with vertical arrangement and long-flow secondary combustion chamber. 2 According to claim 1, the rotary hearth type urban waste pyrolysis gasification incineration treatment device is characterized in that: the waste heat boiler consists of a narrow moving grate, a second combustion chamber, a membrane water wall, a superheater, a coal-saving It is composed of a device and a steam drum, and adopts an angle tube structure. 3. According to claim 1, the rotary hearth type municipal waste pyrolysis gasification incineration treatment device is characterized in that: the rotary kiln is a slow-rotating kiln body, the furnace body is a steel cylinder, and the inner liner is a refractory layer , Inclined arrangement, including garbage feed hopper, pusher, primary air outlet, heating device, kiln outlet and narrow mobile grate connection.

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