CN215236709U - Low-temperature thermal decomposition treatment device for household garbage incineration fly ash - Google Patents
Low-temperature thermal decomposition treatment device for household garbage incineration fly ash Download PDFInfo
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- CN215236709U CN215236709U CN202120755453.0U CN202120755453U CN215236709U CN 215236709 U CN215236709 U CN 215236709U CN 202120755453 U CN202120755453 U CN 202120755453U CN 215236709 U CN215236709 U CN 215236709U
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Abstract
The utility model relates to a low-temperature thermal decomposition treatment device for fly ash generated by burning household garbage, which comprises a fly ash bin, a fly ash conveying pipeline, a hot-blast stove, a low-temperature thermal decomposition reaction tower, a high-temperature fan, an ash discharge valve and a high-temperature mixing stirrer; introducing 380-400 ℃ hot flue gas generated by a hot blast stove into a sandwich structure of a low-temperature thermal decomposition reaction tower through a high-temperature fan for heating fly ash in the tower; heating the fly ash at 380-400 ℃ for more than 60min under the condition of nitrogen to realize low-temperature thermal decomposition; the utility model discloses utilize low temperature thermal decomposition reaction tower, realize the low temperature thermal decomposition of flying dust to reduce the dioxin concentration in the flying dust by a wide margin, reduce the harm of domestic waste incineration flying dust to the environment.
Description
Technical Field
The utility model relates to a msw incineration technical field especially relates to a domestic waste burns flying dust low temperature thermal decomposition processing apparatus.
Background
The garbage incineration technology is a technology for carrying out reduction, harmless and recycling treatment on garbage, which is rapidly developed in recent ten years, and has the advantages of strong adaptability to the garbage, low requirement on the pretreatment of the garbage, wide range of application to the calorific value of the garbage, simplicity and convenience in operation and maintenance and the like, so that the garbage incineration technology is widely applied to the treatment of urban garbage at present.
However, fly ash generated by incineration of garbage contains a large amount of dioxin. The dioxane substances are very stable, have high melting points, are solid at normal temperature, are very insoluble in water, can be dissolved in most organic solvents, and are colorless and tasteless fat-soluble substances, so the dioxane substances are very easy to accumulate in organisms and are considered to have great harm to the ecological environment and the human health.
Disclosure of Invention
The utility model provides a domestic waste burns flying dust low temperature thermal decomposition processing apparatus utilizes low temperature thermal decomposition reaction tower, realizes the low temperature thermal decomposition of flying dust to reduce the dioxin concentration in the flying dust by a wide margin, reduce the harm of domestic waste burns flying dust to the environment.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a low-temperature thermal decomposition treatment device for household garbage incineration fly ash comprises a fly ash bin, a fly ash conveying pipeline, a hot blast furnace, a low-temperature thermal decomposition reaction tower, a high-temperature fan, an ash discharge valve and a high-temperature mixing stirrer; the bottom of the fly ash bin is provided with a fly ash discharge hole which is connected with a feed inlet of the low-temperature thermal decomposition reaction tower through a fly ash conveying pipeline, and the fly ash conveying pipeline is a wind conveying pipeline; the tower body of the low-temperature thermal decomposition reaction tower is provided with an interlayer structure, the interlayer structure is provided with a hot air inlet and a hot air outlet, the hot air inlet is connected with a high-temperature flue gas outlet of the hot blast stove through a hot air pipeline, a high-temperature fan is arranged on the hot air pipeline, and the hot air outlet is connected with a primary air pipeline of the hot blast stove; the nitrogen inlet is arranged at the upper part of the tower body of the low-temperature thermal decomposition reaction tower, the ash outlet is arranged at the bottom of the tower body, the high-temperature mixing stirrer is connected through an ash outlet pipeline, an ash discharge valve is arranged on the ash outlet pipeline, and the high-temperature mixing stirrer is provided with a water inlet connected with a water conveying pipeline.
And a three-way pipe joint is arranged at one end of the fly ash conveying pipeline close to the fly ash bin and is respectively connected with a fly ash discharge port of the fly ash bin and an air outlet of the Roots blower.
And an insulating layer is arranged outside the tower body of the low-temperature thermal decomposition reaction tower.
The hot air inlet is arranged at the bottom of one side of the sandwich structure, and the hot air outlet is arranged at the top of the other side of the sandwich structure.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the low-temperature thermal decomposition reaction tower is utilized to realize the low-temperature thermal decomposition of the fly ash, thereby greatly reducing the concentration of dioxin in the fly ash and reducing the harm of the fly ash from the incineration of the household garbage to the environment;
2) the device has the characteristics of low investment cost, simple structure, convenient maintenance, long service life and the like
Drawings
FIG. 1 is a schematic structural view of a low-temperature thermal decomposition treatment device for fly ash from incineration of household garbage.
In the figure: 1. fly ash bin 2, Roots blower 3, hot-blast stove 4, low-temperature thermal decomposition reaction tower 5, high-temperature blower 6, ash discharge valve 7, high-temperature mixing stirrer
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1, the low-temperature thermal decomposition treatment device for the fly ash generated by burning the household garbage comprises a fly ash bin 1, a fly ash conveying pipeline, a hot blast stove 3, a low-temperature thermal decomposition reaction tower 4, a high-temperature fan 5, an ash discharge valve 6 and a high-temperature mixing stirrer 7; the bottom of the fly ash bin 1 is provided with a fly ash discharge hole which is connected with a feed inlet of the low-temperature thermal decomposition reaction tower 4 through a fly ash conveying pipeline, and the fly ash conveying pipeline is a wind conveying pipeline; the tower body of the low-temperature thermal decomposition reaction tower 4 is provided with a sandwich structure, the sandwich structure is provided with a hot air inlet and a hot air outlet, the hot air inlet is connected with a high-temperature flue gas outlet of a hot blast stove 3 through a hot air pipeline, the hot air pipeline is provided with a high-temperature fan 5, and the hot air outlet is connected with a primary air pipeline of the hot blast stove 3; the upper part of the tower body of the low-temperature thermal decomposition reaction tower 4 is provided with a nitrogen inlet, the bottom of the tower body is provided with an ash outlet, the tower body is connected with a high-temperature mixing stirrer 7 through an ash outlet pipeline, the ash outlet pipeline is provided with an ash discharge valve 6, and the high-temperature mixing stirrer 7 is provided with a water inlet which is connected with a water delivery pipeline.
And a three-way pipe joint is arranged at one end of the fly ash conveying pipeline close to the fly ash bin 1 and is respectively connected with a fly ash discharge port of the fly ash bin 1 and an air outlet of the Roots blower 2.
And a heat-insulating layer is arranged outside the tower body of the low-temperature thermal decomposition reaction tower 4.
The hot air inlet is arranged at the bottom of one side of the sandwich structure, and the hot air outlet is arranged at the top of the other side of the sandwich structure.
The working process of the domestic waste incineration fly ash low-temperature thermal decomposition treatment device is as follows:
1) blowing the fly ash in the fly ash bin 1 into a low-temperature thermal decomposition reaction tower 4 along a fly ash conveying pipeline by wind power generated by a Roots blower 2;
2) introducing nitrogen to replace air in the tower after the fly ash in the low-temperature thermal decomposition reaction tower 4 reaches a set amount, so that the fly ash is in an oxygen-free or anoxic nitrogen environment in the low-temperature thermal decomposition reaction tower 4;
3) introducing 380-400 ℃ hot flue gas generated by a hot blast stove 3 into a sandwich structure of a low-temperature thermal decomposition reaction tower 4 through a high-temperature fan 5 for heating fly ash in the tower; heating the fly ash at 380-400 ℃ for more than 60min under the condition of nitrogen to realize low-temperature thermal decomposition; the hot flue gas passing through the sandwich structure is sent into a primary air system of the hot blast stove 3 again for recycling;
4) the fly ash after the low-temperature thermal decomposition reaction enters a high-temperature mixing stirrer 7 through an ash discharge valve 6, and the stucco after being mixed and stirred by adding water is sent out for subsequent treatment.
At present, the conventional treatment adopted for the fly ash from the incineration of the domestic waste has the following three types: a fly ash cement chelation method, a cement kiln synergistic treatment method and a high-temperature melting method. According to experiments, the fly ash is heated at 250-400 ℃ for more than 60min under the condition of nitrogen, the total concentration reduction rate of high-chlorinated dioxin in the fly ash is 67% -100%, and 400 ℃ is the optimal temperature. A domestic waste burns flying dust low temperature thermal decomposition processing apparatus adopts roots's fan to realize the air conveying of flying dust, utilizes the hot flue gas of about 400 ℃ that the hot-blast furnace produced, introduces the sandwich structure of low temperature thermal decomposition reaction tower through high temperature fan with hot flue gas and heats the flying dust under the nitrogen gas condition to realize the minimizing of dioxin in the flying dust.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (4)
1. A low-temperature thermal decomposition treatment device for household garbage incineration fly ash is characterized by comprising a fly ash bin, a fly ash conveying pipeline, a hot blast stove, a low-temperature thermal decomposition reaction tower, a high-temperature fan, an ash discharge valve and a high-temperature mixing stirrer; the bottom of the fly ash bin is provided with a fly ash discharge hole which is connected with a feed inlet of the low-temperature thermal decomposition reaction tower through a fly ash conveying pipeline, and the fly ash conveying pipeline is a wind conveying pipeline; the tower body of the low-temperature thermal decomposition reaction tower is provided with an interlayer structure, the interlayer structure is provided with a hot air inlet and a hot air outlet, the hot air inlet is connected with a high-temperature flue gas outlet of the hot blast stove through a hot air pipeline, a high-temperature fan is arranged on the hot air pipeline, and the hot air outlet is connected with a primary air pipeline of the hot blast stove; the nitrogen inlet is arranged at the upper part of the tower body of the low-temperature thermal decomposition reaction tower, the ash outlet is arranged at the bottom of the tower body, the high-temperature mixing stirrer is connected through an ash outlet pipeline, an ash discharge valve is arranged on the ash outlet pipeline, and the high-temperature mixing stirrer is provided with a water inlet connected with a water conveying pipeline.
2. The low-temperature thermal decomposition treatment device for the fly ash generated by burning the household garbage according to claim 1, wherein a three-way pipe joint is arranged at one end of the fly ash conveying pipeline close to the fly ash bin and is respectively connected with a fly ash discharge port of the fly ash bin and an air outlet of the Roots blower.
3. The device for low-temperature thermal decomposition treatment of fly ash from incineration of household garbage according to claim 1, wherein an insulating layer is arranged outside the tower body of the low-temperature thermal decomposition reaction tower.
4. The apparatus according to claim 1, wherein the hot air inlet is disposed at the bottom of one side of the sandwich structure, and the hot air outlet is disposed at the top of the other side of the sandwich structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120755453.0U CN215236709U (en) | 2021-04-13 | 2021-04-13 | Low-temperature thermal decomposition treatment device for household garbage incineration fly ash |
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| CN202120755453.0U CN215236709U (en) | 2021-04-13 | 2021-04-13 | Low-temperature thermal decomposition treatment device for household garbage incineration fly ash |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113118182A (en) * | 2021-04-13 | 2021-07-16 | 中冶焦耐(大连)工程技术有限公司 | Low-temperature thermal decomposition treatment device and method for household garbage incineration fly ash |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113118182A (en) * | 2021-04-13 | 2021-07-16 | 中冶焦耐(大连)工程技术有限公司 | Low-temperature thermal decomposition treatment device and method for household garbage incineration fly ash |
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