CN214470128U - Flue gas recycling system for rotary kiln - Google Patents
Flue gas recycling system for rotary kiln Download PDFInfo
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- CN214470128U CN214470128U CN202022591935.5U CN202022591935U CN214470128U CN 214470128 U CN214470128 U CN 214470128U CN 202022591935 U CN202022591935 U CN 202022591935U CN 214470128 U CN214470128 U CN 214470128U
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- rotary kiln
- flue gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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Abstract
The utility model discloses a flue gas recycling system for a rotary kiln, which comprises a rotary kiln, a jacket device, a hot blast stove, a circulating fan and an air heat exchanger; a temperature sensor is arranged inside the rotary kiln; the jacket device is arranged outside the rotary kiln; the hot blast stove is provided with a natural gas inlet and a pyrolysis gas inlet; the air outlet of the hot blast stove is connected with the air inlet of the jacket device, and the air outlet of the jacket device is respectively connected with the air inlet of the air heat exchanger and the air inlet of the circulating fan; the air outlet of the circulating fan is connected with the hot blast stove. On the basis of the existing rotary kiln equipment, 80-90% of high-temperature flue gas of the rotary kiln is subjected to thermal circulation by using a circulating fan, and enters the hot blast stove again to be reheated, so that the temperature of the high-temperature flue gas rises again, and heat is provided for the rotary kiln, so that the thermal circulation is realized, and the energy utilization rate is improved.
Description
Technical Field
The utility model relates to a refuse treatment technical field, concretely relates to flue gas recycling system for rotary kiln.
Background
The oxygen-free cracking process is started as an organic harmless treatment mode, domestic garbage can be subjected to harmless treatment, organic matters are converted into useful substances for people, and the problem of environmental pollution is greatly reduced. At present, the rotary kiln for anaerobic cracking mostly adopts a method of heating a cylinder in a high-temperature flue gas jacket so as to achieve the purpose of cracking organic matters in the kiln in an anaerobic environment. In the existing anaerobic cracking process, the heat source of the rotary kiln is mainly provided by high-temperature flue gas generated by combustion in a hot blast stove. The formation of high temperature flue gas inevitably consumes a large amount of energy. Therefore, reducing energy consumption is an advantageous way to reduce production costs.
When the anaerobic cracking system is in production and operation, a large amount of cold air needs to be supplemented in the combustion process of a hearth of the hot blast stove for auxiliary combustion, and the consumption of natural gas reaches 90m when air at the normal temperature of 25 ℃ is mixed and heated to high-temperature flue gas at the temperature of 550-600 DEG C3H is used as the reference value. In the prior art, high-temperature flue gas generated by a hot blast stove is conveyed by a high-temperature pipeline, the temperature of the high-temperature flue gas is kept at 550-600 ℃ at the inlet of a jacket of the rotary kiln, and the temperature of the flue gas at the outlet of the jacket is kept at 350-400 ℃ after heat exchange of the jacket. If the high-temperature flue gas at the outlet of the rotary kiln jacket is directly discharged into the atmosphere after being subjected to air heat exchange and heat exchange for cooling and dust removal by the bag-type dust remover, great energy waste can be caused.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of prior art, the utility model aims to provide a flue gas recycling system for rotary kiln, on the basis of current rotary kiln equipment, utilize circulating fan to carry out the thermal cycle with the 80 ~ 90% high temperature flue gas of rotary kiln, reenter the hot-blast furnace and reheat, make high temperature flue gas temperature rise again, provide the heat for the rotary kiln again. The heat circulation is realized, and the energy consumption of the hot blast stove is reduced to 50 percent under the same condition.
The purpose of the utility model is realized by adopting the following technical scheme:
a flue gas recycling system for a rotary kiln comprises the rotary kiln, a jacket device, a hot blast stove, a circulating fan and an air heat exchanger; a temperature sensor is arranged inside the rotary kiln; the jacket device is arranged outside the rotary kiln; the hot blast stove is provided with a natural gas inlet and a pyrolysis gas inlet; the air outlet of the hot blast stove is connected with the air inlet of the jacket device, and the air outlet of the jacket device is respectively connected with the air inlet of the air heat exchanger and the air inlet of the circulating fan; the air outlet of the circulating fan is connected with the hot blast stove.
The utility model provides a rotary kiln is used for anaerobic schizolysis technology, and the rotary kiln utilizes the high temperature flue gas in the hot-blast furnace to carry out heat-conduction and carry out anaerobic schizolysis to rubbish in the jacket device, and guarantees the state that is anaerobic environment schizolysis in the rotary kiln. The heat required by the operation of the cracking system is provided by a hot blast stove, the hot blast stove respectively utilizes natural gas and cracking gas as fuel gas, cold air needs to be introduced from the outside in the combustion process of the hot blast stove, and high-temperature flue gas generated by the hot blast stove is mainly obtained by mixing and combusting the cracking gas, the natural gas and the taken cold air together. And the circulating fan conveys 85-90% of high-temperature flue gas coming out of the jacket device of the rotary kiln into a hearth of the hot blast stove through a pipeline to be reheated so as to achieve the purpose of reducing cold air intake and auxiliary combustion, and the recycling process is carried out after the temperature of the flue gas is raised to 550-600 ℃. And cooling the remaining 10-15% of high-temperature flue gas by using an air heat exchanger, and then exhausting the high-temperature flue gas to the chimney through a pipeline to discharge the high-temperature flue gas out of the atmosphere. The whole flue gas circulation system has simple and convenient flow, the natural gas consumption is reduced to about 50 percent, and the energy consumption is greatly reduced.
Further, the device also comprises a combustion-supporting fan, wherein the air outlet of the combustion-supporting fan is connected with the air inlet of the hot blast stove.
Still further, a dispatchable valve is arranged on the natural gas inlet.
Furthermore, a schedulable valve is arranged on the cracking gas inlet.
And furthermore, a flue gas guide plate is arranged in the jacket device. The basic principle of the rotary kiln anaerobic cracking is that high-temperature flue gas directly heats the outer surface of a jacket inner cylinder steel plate, and materials in the rotary kiln directly conduct heat with the inner surface of the jacket inner cylinder steel plate in a direct contact mode and then reach the reaction temperature to perform cracking reaction.
Furthermore, the outside of the pipeline for transmitting gas is wrapped with heat insulation cotton. The heat loss caused by gas transportation is reduced.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the system of the utility model can keep the stable heat supply of the rotary kiln, and most (85-90%) of high-temperature flue gas generated by the rotary kiln is returned to the hot blast stove for recycling by the circulating fan, so that the energy utilization rate is improved; the natural gas consumption of the hot blast stove is reduced, the intake of cold air is reduced, and the rest (10-15%) high-temperature flue gas is cooled by the air heat exchanger and then is exhausted out of the atmosphere from a chimney through a pipeline.
Drawings
Fig. 1 is a connection diagram of the device of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.
A flue gas recycling system for a rotary kiln is shown in figure 1 and comprises the rotary kiln, a jacket device, a hot blast stove, a circulating fan, an air heat exchanger and a combustion fan; a temperature sensor is arranged inside the rotary kiln; the temperature sensor is used for detecting the temperature of high-temperature flue gas formed in the rotary kiln.
The jacket device is arranged outside the rotary kiln, and a flue gas guide plate is arranged inside the jacket device; the high-temperature flue gas directly heats the outer surface of the cylinder steel plate in the jacket device, and the materials in the rotary kiln directly conduct heat with the inner surface of the cylinder steel plate in the jacket device in a direct contact mode and then reach the reaction temperature to generate cracking reaction.
The hot blast stove is provided with a natural gas inlet and a pyrolysis gas inlet; the natural gas inlet and the pyrolysis gas inlet are respectively provided with a scheduling valve; in actual operation, the natural gas inlet and the pyrolysis gas inlet respectively correspond to two different burners of the hot blast stove, and cold air can be taken in from the outside when the two burners work. The pipeline for cold air to enter the combustor is also provided with a dispatchable valve. It should be noted that the cool air is not limited to a temperature, and is air that has not been processed from the outside.
The air outlet of the hot blast stove is connected with the air inlet of the jacket device, and the air outlet of the jacket device is respectively connected with the air inlet of the air heat exchanger and the air inlet of the circulating fan; the air outlet of the circulating fan is connected with the hot blast stove; the air outlet of the combustion-supporting fan is connected with the air inlet of the hot blast stove, and the combustion-supporting fan provides air for the hot blast stove as combustion-supporting air. The outside of the pipeline for conveying gas is wrapped with heat insulation cotton. The heat loss caused by gas transportation is reduced.
The utility model discloses an operation step of system as follows:
when the system is started and operated in a cold state, the frequency of the circulating fan is gradually adjusted along with the continuous rising of the temperature of the flue gas in the rotary kiln, the opening degrees of the valves of the natural gas and the pyrolysis gas and the opening degree of the cold air valve are gradually reduced, and the parameters are finely adjusted to maintain the balance of the whole system after the set temperature is reached.
When the system is started in a hot state, the opening degrees of a natural gas valve and a cold air valve are properly kept, when the temperature of flue gas reaches 550-600 ℃, the frequency of a circulating fan is increased, and the opening degrees of the natural gas valve and the cold air valve are reduced. High-temperature flue gas generated by combustion in a hearth of the hot blast stove is induced by a circulating fan through a high-temperature pipeline and enters a jacket device of the rotary kiln from the hearth of the hot blast stove, the temperature of the flue gas at an inlet of the jacket device of the rotary kiln is 550-600 ℃ after being conveyed by the pipeline, and the temperature of the flue gas is kept at 350-400 ℃ when the flue gas reaches a flue gas outlet of the jacket device after the heat exchange process of a guide plate channel in the jacket device. Then, 85% -90% of high-temperature flue gas coming out of the jacket device of the rotary kiln is conveyed into a hearth of a hot blast stove through a pipeline by using a circulating fan to be reheated, so that the aim of reducing cold air intake and auxiliary combustion is fulfilled, and a recycling process is carried out after the temperature of the flue gas is raised to 550-600 ℃.
Cooling the remaining 10-15% of high-temperature flue gas by an air heat exchanger, and then exhausting the high-temperature flue gas to the chimney through a pipeline to discharge the high-temperature flue gas to the atmosphere. Because the residual high-temperature flue gas is less, a bag-type dust collector and a flue gas induced draft fan are not needed to be additionally arranged, and the high-temperature flue gas is cooled by an air heat exchanger and then is conveyed to a chimney through a pipeline to be discharged. The whole flue gas recycling system has simple and convenient flow, the natural gas consumption is reduced to about 50 percent, and the energy consumption is greatly reduced.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.
Claims (6)
1. A flue gas recycling system for a rotary kiln comprises the rotary kiln, and is characterized by also comprising a jacket device, a hot blast stove, a circulating fan and an air heat exchanger; a temperature sensor is arranged inside the rotary kiln; the jacket device is arranged outside the rotary kiln; the hot blast stove is provided with a natural gas inlet and a pyrolysis gas inlet; the air outlet of the hot blast stove is connected with the air inlet of the jacket device, and the air outlet of the jacket device is respectively connected with the air inlet of the air heat exchanger and the air inlet of the circulating fan; the air outlet of the circulating fan is connected with the hot blast stove.
2. The flue gas recycling system for the rotary kiln as recited in claim 1, further comprising a combustion fan, wherein an air outlet of the combustion fan is connected to an air inlet of the hot blast stove.
3. The flue gas recycling system for a rotary kiln as claimed in claim 1, wherein the natural gas inlet is provided with a dispatchable valve.
4. The flue gas recycling system for a rotary kiln as recited in claim 1, wherein the pyrolysis gas inlet is provided with a dispatchable valve.
5. The flue gas recycling system for a rotary kiln as claimed in claim 1, wherein the inside of the jacket means is provided with a flue gas guide plate.
6. The flue gas recycling system for a rotary kiln as claimed in claim 1, wherein the outside of the gas conveying pipe is covered with heat insulating cotton.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022591935.5U CN214470128U (en) | 2020-11-10 | 2020-11-10 | Flue gas recycling system for rotary kiln |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022591935.5U CN214470128U (en) | 2020-11-10 | 2020-11-10 | Flue gas recycling system for rotary kiln |
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| CN214470128U true CN214470128U (en) | 2021-10-22 |
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| CN202022591935.5U Active CN214470128U (en) | 2020-11-10 | 2020-11-10 | Flue gas recycling system for rotary kiln |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114136114A (en) * | 2021-11-12 | 2022-03-04 | 上海置信能源综合服务有限公司 | Low-carbon-dioxide-emission external-heating calcining kiln combustion heating system |
| CN114477136A (en) * | 2022-03-23 | 2022-05-13 | 安徽科达洁能股份有限公司 | System for carbonizing negative electrode material and carbonization process |
| CN117088585A (en) * | 2023-06-05 | 2023-11-21 | 四川君和环保股份有限公司 | Pyrolysis process for oily sludge |
| CN117606225A (en) * | 2024-01-23 | 2024-02-27 | 佛山市天禄智能装备科技有限公司 | Zero-emission pre-carbonization rotary furnace utilizing waste gas for self-combustion |
-
2020
- 2020-11-10 CN CN202022591935.5U patent/CN214470128U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114136114A (en) * | 2021-11-12 | 2022-03-04 | 上海置信能源综合服务有限公司 | Low-carbon-dioxide-emission external-heating calcining kiln combustion heating system |
| CN114477136A (en) * | 2022-03-23 | 2022-05-13 | 安徽科达洁能股份有限公司 | System for carbonizing negative electrode material and carbonization process |
| CN117088585A (en) * | 2023-06-05 | 2023-11-21 | 四川君和环保股份有限公司 | Pyrolysis process for oily sludge |
| CN117606225A (en) * | 2024-01-23 | 2024-02-27 | 佛山市天禄智能装备科技有限公司 | Zero-emission pre-carbonization rotary furnace utilizing waste gas for self-combustion |
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