CN216639546U - Zero carbon discharge system with blast furnace flue gas recycling and oxygen-increasing combustion-supporting flue gas recycling - Google Patents
Zero carbon discharge system with blast furnace flue gas recycling and oxygen-increasing combustion-supporting flue gas recycling Download PDFInfo
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- CN216639546U CN216639546U CN202123227334.7U CN202123227334U CN216639546U CN 216639546 U CN216639546 U CN 216639546U CN 202123227334 U CN202123227334 U CN 202123227334U CN 216639546 U CN216639546 U CN 216639546U
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Abstract
The utility model relates to a system with zero emission of blast furnace flue gas recycling and oxygenation combustion-supporting flue gas recycling carbon, which effectively solves the problems that the waste gas emission achieves zero emission of pollutants, the productivity is improved, the energy is saved, the energy consumption is reduced and the heat utilization rate is improved, a burner gas inlet and a combustion-supporting air inlet on the upper part of a first hot blast stove are respectively connected with an outlet of a gas preheater of a waste heat recovery station and an outlet of a combustion-supporting air preheater through pipelines, a waste gas outlet on the lower part of the first hot blast stove is connected with a waste gas inlet of the waste heat recovery station, the gas preheater is connected with a gas outlet, the combustion-supporting air preheater is connected with a combustion-supporting air station, a waste gas outlet of the waste heat recovery station is communicated with an inlet of a four-way joint, a purifier is communicated with a waste gas inlet of a blast furnace blower, the blast furnace blower is connected with an air inlet of a second hot blast stove, an outlet of the second hot blast stove is connected with an air inlet, and a carbon monoxide outlet on the upper part of the blast furnace is connected with the gas station, the utility model has good use effect, improves the combustion effect, saves raw coal and reduces energy consumption.
Description
Technical Field
The utility model relates to a blast furnace hot blast stove, in particular to a zero emission system for realizing environmental protection by reacting carbon dioxide in blast furnace hot blast stove waste gas with oxygen supplement and a large amount of carbon in a tuyere to generate carbon monoxide, and the zero emission system has the advantages of recycling blast furnace flue gas and recycling oxygen-increasing combustion-supporting flue gas.
Background
A blast furnace hot blast stove is a common device for iron smelting in industrial production, a traditional hot blast stove adopts a combustion and air supply mode of a hot blast stove with two combustion and one air supply or two combustion and two air supply, and the hot blast stove forms two independent combustion systems and an air supply system under the working state. Harmful gases such as 50-500 mg of nitrogen oxide, 50-300 mg of sulfur dioxide, 25-30% of carbon dioxide and the like are formed in a combustion system by combustion according to the temperature of wind and are directly discharged into the atmosphere from a smoke exhaust chimney, so that the environment is seriously polluted. The supply air is a large volume of air in the consumer area environment. Both combustion and air supply systems pose a significant environmental hazard. The consumption fuel ratio fluctuation of the traditional production process is in the range of 480-; the coke ratio is 300-450 kg; the coal ratio is in the range of 120-200 kg; under the background, the problem that the smoke circulation system of the existing blast furnace needs to be improved and innovated technically and inevitably causes heavy pollution due to the fact that toxic gas which consumes air, oxygen and pollutes the environment is discharged again is urgently needed, and although a smoke circulation utilization system capable of achieving micro-emission of the hot blast furnace is provided, further practice shows that the smoke circulation utilization system still needs to be further improved, particularly, how to utilize carbon produced in the blast furnace and carbon dioxide in smoke of the hot blast furnace to generate carbon monoxide reburning gas under the condition of supplementary combustion supporting of oxygen, further heat energy is improved, resources are saved, pollution to the environment is reduced, how to oxygenate a combustion air station is improved, the combustion effect is enhanced, further energy conservation and environmental protection are achieved, and the technical problem needs to be further solved.
SUMMERY OF THE UTILITY MODEL
In view of the above situation, in order to overcome the defects of the prior art, the utility model aims to provide a zero emission system with blast furnace flue gas recycling and oxygen increasing combustion supporting flue gas recycling carbon, which can effectively further solve the problems of zero emission of pollutants, capacity improvement, energy saving, energy consumption reduction, heat utilization rate improvement and air pollution prevention in waste gas emission.
The utility model solves the technical scheme that the zero emission system with the functions of recycling blast furnace flue gas and recycling oxygen-increasing combustion-supporting flue gas circularly utilizes carbon, comprises two hot blast furnaces and a blast furnace which are arranged at intervals, a burner gas inlet and a combustion-supporting air inlet at the upper part of a first hot blast furnace are respectively communicated with an outlet of a gas preheater of a waste heat recovery station and an outlet of a combustion-supporting air preheater through pipelines, a waste gas outlet at the lower part of the first hot blast furnace is communicated with a waste gas inlet of the preheater of the waste heat recovery station through a waste gas pipeline, an inlet of the gas preheater is communicated with a gas outlet of the gas station, an inlet of the combustion-supporting air preheater is communicated with an outlet of a combustion-supporting air station, a waste gas outlet of the preheater of the waste heat recovery station is communicated with an inlet 1 of a cross-joint through a pipeline, a first waste gas outlet 3 of the cross-joint is communicated with a gas inlet at the lower part of a chimney through a pipeline and a first valve, a second waste gas outlet 4 of the cross-joint is communicated with an inlet of a purifier (station) through a pipeline, the four-way three-waste gas outlet 2 is communicated with the waste gas inlet of the combustion-supporting air station through a third pipeline, the outlet of the purifier is communicated with the waste gas inlet of a blast furnace blower, the pure oxygen inlet of the blast furnace blower is communicated with the first oxygen outlet 1 of the oxygen generator through a pipeline, the outlet of the blast furnace blower is communicated with the air inlet at the lower part of the second hot blast stove through a pipeline, the outlet at the upper part of the second hot blast stove is communicated with the blast furnace air inlet at the lower part of the blast furnace through a first pipeline, the carbon monoxide outlet at the upper part of the blast furnace is communicated with the inlet of the gas station through a second pipeline, and the second oxygen outlet 2 of the oxygen generator is communicated with the oxygen inlet of the combustion-supporting air station through a pipeline.
The utility model has novel and unique structure, scientific and reasonable design and good use effect, can effectively further reduce pollutant emission and improve the productivity, carbon monoxide in the recycled blast furnace waste gas enters a gas station to be mixed with gas, is preheated by a gas preheater, then enters a first blast furnace through a gas inlet of a burner to be combusted, and oxygen is added into a combustion-supporting air station, so that the combustion effect can be further improved, the utility model is very favorable for further improving the heat utilization rate, saving raw coal, reducing energy consumption and preventing pollution to the atmospheric environment, and has remarkable economic and social benefits.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The following detailed description of embodiments of the utility model refers to the accompanying drawings.
As shown in figure 1, the carbon zero emission system with blast furnace flue gas recycling and oxygen-increasing combustion-supporting flue gas recycling comprises two hot blast furnaces and a blast furnace which are arranged alternately, a coal gas inlet and a combustion-supporting air inlet of a combustor 6 at the upper part of a first hot blast furnace 1 are respectively communicated with an outlet of a coal gas preheater 5-1 and an outlet of a combustion-supporting air preheater 5-2 of a waste heat recovery station 5 through pipelines, a waste gas outlet at the lower part of the first hot blast furnace 1 is communicated with a waste gas inlet of a preheater 5-3 of the waste heat recovery station 5 through a waste gas pipeline 7, an inlet of the coal gas preheater 5-1 is communicated with a coal gas outlet of the coal gas station 3, an inlet of the combustion-supporting air 5-2 is communicated with an outlet of a combustion-supporting air station 4, a waste gas outlet of the preheater 5-3 of the waste heat recovery station 5 is communicated with an inlet 1 of a cross 22 through a pipeline and a first waste gas outlet 3 of the cross 22 is communicated with a gas inlet at the lower part of a chimney 18 through a pipeline and a first valve 19-1 The second waste gas outlet 4 of the cross 22 is communicated with the inlet of a purifier (station) 8 through a pipeline, the third waste gas outlet 2 of the cross 22 is communicated with the waste gas inlet of a combustion-supporting air station 4 through a third pipeline 23, the outlet of the purifier 8 is communicated with the waste gas inlet 11 of a blast furnace blower 9, the pure oxygen inlet 13 of the blast furnace blower 9 is communicated with the first oxygen outlet 1 of an oxygen generator 20 through a pipeline, the outlet of the blast furnace blower 9 is communicated with the air inlet at the lower part of the second hot blast stove 2 through a pipeline, the outlet 16 at the upper part of the second hot blast stove is communicated with the blast furnace air inlet 10 at the lower part of the blast furnace 12 through a first pipeline 17, the carbon monoxide outlet at the upper part of the blast furnace 12 is communicated with the inlet of a gas station 3 through a second pipeline 19, and the second oxygen outlet 2 of the oxygen generator 20 is communicated with the oxygen inlet of the combustion-supporting air station 4 through a pipeline.
In order to ensure the use effect and the convenience in use, a second valve 19-2 is arranged on a pipeline between the four-way valve 22 and the purifier 8;
a third valve 19-3 is arranged on a pipeline which is communicated with a pure oxygen inlet 13 of the blast furnace blower 9 and a pure oxygen outlet of the oxygen generator 20;
the waste heat recovery station 5 is an integrated structure consisting of a coal gas preheater 5-1, a combustion-supporting air preheater 5-2 and a preheater 5-3;
a fourth valve 19-4 is arranged on a third pipeline 23 which is communicated with the four-way valve 22 and the combustion-supporting air station 4;
a fifth valve 19-5 is arranged on a second pipeline 19 which is communicated with the gas station 3 and arranged at the upper part of the blast furnace 12;
and a cold air chamber 15 is arranged at the lower bottom of the second hot air furnace.
The above description is only an example, and is not intended to limit the scope of the present invention, and all substantially identical embodiments made by equivalent and equivalent means are within the scope of the present invention.
When the device is used, the first hot blast stove forms a combustion state system, the second hot blast stove forms an air supply system, a first valve is arranged on a pipeline, which is connected with the outlet of the preheater of the waste heat recovery station and the chimney, and is close to the chimney, the first valve is completely closed or is removed and blocked to stop using under the normal working state of a circulating system of the hot blast stove, and meanwhile, a blast furnace blower is not used any more to suck cold air. Therefore, the first valve between the chimney and the smoke exhaust pipeline of the hot blast stove in the normal operation process is completely closed or the chimney is removed, and a flue gas recycling circulation system integrated structure integrating combustion and air supply is formed; the first hot blast stove combustion state system is characterized in that coal gas and air of a coal gas station and a combustion-supporting air station are arranged in pipelines, the pipelines pass through a waste heat recovery station arranged between a smoke exhaust pipeline and a waste gas purifier to carry out waste heat preheating on the coal gas and the air, then a first hot blast stove burner is introduced, the coal gas and the air are distributed into a burner nozzle through the burner to carry out mixed combustion, high-temperature smoke generated by combustion uniformly carries out heat storage and heating on a heat storage body, the high-temperature smoke passes through a smoke pipeline at the lower part of the first hot blast stove and is connected with the waste heat recovery station, tail end waste gas after waste heat exchange of the heat exchange recovery station is purified through the purifier and then is introduced into a blast furnace blower in front of an air supply state system formed by a second hot blast stove, a tail end waste gas inlet and a pure oxygen inlet are arranged on the same side of the blast furnace blower, and the other end is a mixed outlet of the tail end smoke and the oxygen, the mixed outlet is connected with a cold air chamber at the lower part of the second hot blast stove through a pipeline, and the mixed gas replaces the high-temperature heat stored in the air supply stove out and is sent into a blast furnace tuyere through a hot air outlet and a pipeline, so that a flue gas recycling and circulating system integrated structure integrating a first hot blast stove independent combustion system and a second hot blast stove independent air supply system is formed.
In the above-mentioned circulation process, the carbon monoxide (part) produced by blast furnace is returned into gas station through the carbon monoxide pipe at upper portion, after being mixed with gas of gas station, the mixture is fed into gas preheater to preheat, then fed into first hot-blast stove, not only can raise the temperature of mixer, but also utilizes the waste gas discharged by blast furnace, so that it not only can save raw coal and reduce energy consumption, at the same time, the oxygen-making machine is fed into combustion-supporting air station through second oxygen outlet, and is favorable for combustion-supporting air combustion and further raise heat energy utilization rate, and can prevent the pollution of waste gas to atmosphere environment Mixing and burning the waste gas and the oxygen. The other part of waste gas (the waste gas which is not used up for combustion supporting, a part of oxygen is added, and the waste gas is directly blown into the blast furnace tuyere area through the hot blast stove by the air blower to generate a part of carbon monoxide and oxygen for combustion, thereby further realizing energy saving and environmental protection, and compared with the prior art, the method has the following beneficial technical effects:
1. the waste gas containing carbon dioxide discharged into the atmosphere is recycled and conveyed to the tuyere area of the blast furnace to perform reduction endothermic reaction with the hot carbon to regenerate the combustible gas of carbon monoxide, and the combustible gas is combusted under the combustion supporting of high-pressure oxygen, so that the waste is changed into valuable, and a large amount of energy is saved. The carbon dioxide is completely recycled, so that the greenhouse effect is reduced, and the zero emission of the carbon dioxide is really achieved;
2. easily reform transform current circulation system, only need install carbon monoxide retrieval and utilization pipeline and gas station intercommunication additional on blast furnace upper portion, simultaneously, with oxygenerator and combustion air station intercommunication, reform transform current circulation system very easily.
3. Through field test, the energy is further saved, the energy consumption is reduced, zero emission of pollutants is almost achieved, energy conservation and environmental protection are truly realized, and remarkable economic and social benefits are achieved.
Claims (7)
1. A zero-emission system with functions of recycling blast furnace flue gas and increasing oxygen to support combustion flue gas to recycle carbon comprises two hot blast furnaces and a blast furnace which are arranged at intervals, and is characterized in that a gas inlet and a combustion-supporting air inlet of a combustor (6) at the upper part of a first hot blast furnace (1) are respectively communicated with an outlet of a gas preheater (5-1) and an outlet of a combustion-supporting air preheater (5-2) of a waste heat recovery station (5) through pipelines, a waste gas outlet at the lower part of the first hot blast furnace (1) is communicated with a waste gas inlet of a preheater (5-3) of the waste heat recovery station (5) through a waste gas pipeline (7), an inlet of the gas preheater (5-1) is communicated with a gas outlet of a gas station (3), an inlet of the combustion-supporting air preheater (5-2) is communicated with an outlet of a combustion-supporting air station (4), a waste gas outlet of the preheater (5-3) of the waste heat recovery station (5) is communicated with an inlet 1 of a cross joint (22) through a pipeline, a first waste gas outlet 3 of a four-way joint (22) is communicated with an air inlet at the lower part of a chimney (18) through a pipeline and a first valve (19-1), a second waste gas outlet 4 of the four-way joint (22) is communicated with an inlet of a purifier (8) through a pipeline, a third waste gas outlet 2 of the four-way joint (22) is communicated with a waste gas inlet of a combustion-supporting air station (4) through a third pipeline (23), an outlet of the purifier (8) is communicated with a waste gas inlet (11) of a blast furnace blower (9), a pure oxygen inlet (13) of the blast furnace blower (9) is communicated with a first oxygen outlet 1 of an oxygen generator (20) through a pipeline, an outlet of the blast furnace blower (9) is communicated with an air inlet at the lower part of a second hot blast furnace (2) through a pipeline, an outlet (16) at the upper part of the second hot furnace is communicated with a blast air inlet (10) at the lower part of the blast furnace (12) through a first pipeline (17), a carbon monoxide outlet at the upper part of the blast furnace (12) is communicated with an inlet of a gas station (3) through a second pipeline (19) The second oxygen outlet 2 of the oxygen generator (20) is communicated with the oxygen inlet of the combustion-supporting air station (4) through a pipeline.
2. The system with the functions of recycling blast furnace flue gas and recycling oxygen-increasing combustion-supporting flue gas as claimed in claim 1, wherein a second valve (19-2) is arranged on a pipeline between the four-way joint (22) and the purifier (8).
3. The system with the functions of recycling the blast furnace flue gas and recycling the oxygen-increasing combustion-supporting flue gas as claimed in claim 1, wherein a third valve (19-3) is arranged on a pipeline of a pure oxygen inlet (13) of the blast furnace blower (9) communicated with a pure oxygen outlet of an oxygen generator (20).
4. The system with the functions of recycling the blast furnace flue gas and recycling the oxygen-increasing combustion-supporting flue gas and realizing the zero emission of carbon as claimed in claim 1, wherein the waste heat recovery station (5) is an integrated structure consisting of a coal gas preheater (5-1), a combustion-supporting air preheater (5-2) and a preheater (5-3).
5. The system with the functions of recycling blast furnace flue gas and recycling oxygen-increasing combustion-supporting flue gas as claimed in claim 1, wherein a fourth valve (19-4) is arranged on a third pipeline (23) which is communicated with the four-way joint (22) and the combustion-supporting air station (4).
6. The system with the functions of recycling blast furnace flue gas and recycling oxygen-increasing combustion-supporting flue gas according to claim 1, wherein a fifth valve (19-5) is arranged on a second pipeline (19) which is communicated with the gas station (3) at the upper part of the blast furnace (12).
7. The system with the functions of recycling blast furnace flue gas and recycling oxygen-increasing combustion-supporting flue gas and realizing zero carbon emission according to claim 1, wherein a cold air chamber (15) is arranged at the lower bottom of the second hot blast stove.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123227334.7U CN216639546U (en) | 2021-12-21 | 2021-12-21 | Zero carbon discharge system with blast furnace flue gas recycling and oxygen-increasing combustion-supporting flue gas recycling |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123227334.7U CN216639546U (en) | 2021-12-21 | 2021-12-21 | Zero carbon discharge system with blast furnace flue gas recycling and oxygen-increasing combustion-supporting flue gas recycling |
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