CN216620694U - Low-carbon emission combustion heating system of carbonate external heating type calcining kiln - Google Patents

Low-carbon emission combustion heating system of carbonate external heating type calcining kiln Download PDF

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CN216620694U
CN216620694U CN202122767790.4U CN202122767790U CN216620694U CN 216620694 U CN216620694 U CN 216620694U CN 202122767790 U CN202122767790 U CN 202122767790U CN 216620694 U CN216620694 U CN 216620694U
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preheater
gas
flue gas
carbonate
air
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蒋宏利
夏卫华
雷威
盛化才
王芳
薛志龙
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Shanghai Xinxin Energy Comprehensive Service Co ltd
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Shanghai Xinxin Energy Comprehensive Service Co ltd
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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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
    • 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
    • Y02P10/25—Process efficiency

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Abstract

The utility model discloses a low-carbon emission combustion heating system of a carbonate external heating type calcining kiln, which comprises an air preheating unit, a gas burner, a steam boiler, an external heating type calcining kiln, a feeding preheater and water supplyA preheater. The utility model adopts a steam boiler to recover the heat of partial high-temperature flue gas, thereby controlling the temperature of the high-temperature flue gas entering the carbonate external heating type calcining kiln to calcine materials, and simultaneously recovering and utilizing the high-temperature flue gas and CO discharged by the carbonate external heating type calcining kiln2The waste heat of the gas heats the fuel gas and air which participate in combustion, and the carbon emission of a combustion system can be effectively reduced while the heat loss of smoke exhaust is reduced. The waste heat of the flue gas is further fully recycled to preheat and heat the carbonate material fed into the external heating calcining kiln and the feed water of the steam boiler, so that the energy utilization rate of a combustion system is improved, and the carbon dioxide emission of the system is further reduced.

Description

Low-carbon emission combustion heating system of carbonate external heating type calcining kiln
Technical Field
The utility model relates to a low-carbon emission combustion heating system of a carbonate external heating type calcining kiln, belonging to the technical field of energy conservation and low carbon.
Background
With the gradual implementation and implementation of carbon peak-reaching and carbon neutralization policies, particularly under the guidance of carbon emission reduction and carbon capture policies, an external heating type calcining kiln technology is taken as one of carbon emission reduction technologies which are mainly concerned in the carbonate calcining industry, and is gradually popularized and applied in high-carbon emission enterprises such as magnesium oxide, quicklime, cement and the like.
The external heating type calcining kiln technology of carbonate separates the calcined carbonate material from high-temperature flue gas through a kiln metal cylinder, the high-temperature flue gas is not in direct contact with the calcined carbonate material, the high-temperature flue gas externally heats the kiln metal cylinder, and the heat of the high-temperature flue gas is transferred to the calcined carbonate material in the kiln cylinder through the kiln cylinder; because the carbon dioxide is not mixed with the flue gas generated by combustion, the high-concentration carbon dioxide generated by calcining and decomposing the carbonate material at high temperature can be recycled after simple purification, and the capture and recycling cost of the carbon dioxide is greatly reduced.
After the metal material of the kiln barrel body reaches a certain high temperature, the strength of the material is sharply reduced along with the rise of the temperature, and the high-temperature resistant metal material is very expensive. At present, the temperature resistance limit and the price of a metal material of a kiln cylinder body are limited, the temperature of flue gas for heating the metal cylinder body of the kiln is generally lower than 1300 ℃, so that in order to reduce the temperature of the flue gas after combustion of fuel gas, a method of increasing an excess air coefficient is generally adopted, a large amount of heat loss of exhaust gas is caused, the fuel consumption is increased, the carbon dioxide emission of a system is directly increased, and the carbon emission reduction effect of an external calcining type kiln technology is reduced.
Secondly, in order to reduce the flue gas temperature after the gas combustion, the gas and air which participate in the combustion usually adopt lower temperature, so that a large amount of waste heat generated by the carbonate external heating calcining kiln can not be fully and effectively recycled, the utilization rate of the combustion heat of the fuel is reduced, and the emission of carbon dioxide of the system is indirectly increased.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provide a low-carbon emission combustion heating system of a carbonate external heating type calcining kiln, which reduces the fuel consumption and the carbon dioxide emission.
In order to achieve the purpose, the utility model is realized by adopting the following technical scheme:
a low-carbon emission combustion heating system of a carbonate external heating type calcining kiln comprises an air preheating unit, a gas burner, a steam boiler, an external heating type calcining kiln, a feeding preheater and a water supply preheater;
the air preheating unit and the gas preheating unit recycle high-temperature flue gas and high-temperature CO discharged by the carbonate external heating calcining kiln2The heat of the gas heats the air and the gas respectively and then the air and the gas are conveyed to a gas burner;
the steam boiler is used for recovering part of heat in high-temperature flue gas discharged by the gas burner to heat feed water so as to control the temperature of the high-temperature flue gas entering the externally-heated calcining kiln and simultaneously produce steam;
the feeding preheater is used for recovering the heat of the medium-temperature flue gas discharged by the gas preheating unit to heat the carbonate material fed into the carbonate external heating calcining kiln;
the feed water preheater is used for recovering the heat of the low-temperature flue gas discharged by the feeding preheater and preheating the feed water fed into the steam boiler.
Further, the air preheating unit comprises a first air preheater and a second air preheater which are sequentially connected along the air conveying direction, and an air outlet of the second air preheater is connected with an air inlet of the gas burner; the gas preheating unit comprises a first gas preheater and a second gas preheater which are sequentially connected along the gas conveying direction, and the gas outlet of the second gas preheater is connected with the gas inlet of the gas burner.
Further, a smoke outlet of the external heating calcining kiln is sequentially connected with a second air preheater, a second gas preheater and a feeding preheater; CO of the external heating calcining kiln2The outlet is connected with the first air preheater and the first gas preheater in sequence.
Still further, the CO of the first gas preheater2The outlet is connected to CO2And a recovery device for performing recovery and utilization.
Furthermore, the discharge port of the feed preheater is connected with the feed port of the external heating calcining kiln, the flue gas inlet of the feed preheater is connected with the flue gas outlet of the gas preheating unit, and the flue gas outlet of the feed preheater is connected with the flue gas inlet of the water supply preheater.
Furthermore, a flue gas inlet of the feed water preheater is connected with a flue gas outlet of the feed water preheater, and a water outlet of the feed water preheater is connected with a feed water inlet of the steam boiler.
Still further, the flue gas outlet of the feedwater preheater is connected with a smoke exhaust purification device, and the flue gas is purified and then discharged.
Furthermore, the smoke inlet of the steam boiler is connected with the smoke outlet of the gas burner, and the smoke outlet of the steam boiler is connected with the smoke inlet of the external heating calcining kiln.
Still further, the steam outlet of steam boiler connects to steam pipe network or turbo generator set. Preferably, a high parameter steam boiler is used to generate steam at high temperature and high pressure for subsequent reuse.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model adopts a steam boiler to recover the heat of part of high-temperature flue gas, thereby controlling the temperature of the high-temperature flue gas entering the carbonate external heating type calcining kiln to calcine materials, and simultaneously recovering and utilizing the high-temperature flue gas and CO discharged by the carbonate external heating type calcining kiln2The waste heat of the gas heats the fuel gas and air which participate in combustion, and the carbon emission of a combustion system can be effectively reduced while the heat loss of smoke exhaust is reduced. The waste heat of the flue gas is further fully recycled to preheat and heat the carbonate material fed into the external heating type calcining kiln and the feed water of the steam boiler, so that the energy utilization rate of a combustion system is improved, and the carbon dioxide emission of the system is further reduced.
Drawings
Fig. 1 is a schematic structural arrangement diagram of a low-carbon-emission combustion heating system of a carbonate external-heating calcining kiln provided in embodiment 1 of the present invention.
In the figure: 1. the device comprises a first air preheater, a second air preheater, a first gas preheater, a second gas preheater, a gas burner, a high-parameter steam boiler, a second externally heated calcining kiln, a first feeding preheater, a second feeding gas burner, a second feeding preheater, a second feeding gas burner, a second boiler, a second feeding preheater, a second feeding gas, a second burning kiln, a 6, a high-heat-burning kiln, 8, a high-burning boiler, a 8, a high-burning-heating-burning boiler, a 8, a high-burning boiler, a 8, a high-burning boiler, a high-burning kiln, a 8, a high-burning boiler, a high-burning preheater, a high-burning boiler, a high-burning preheater, a high-burning boiler, a high-burning preheater.
Detailed Description
The utility model is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The low-carbon emission combustion heating system of the carbonate external heating type calcining kiln shown in fig. 1 comprises an air preheating unit, a gas burner 5, a high-parameter steam boiler 6, an external heating type calcining kiln 7, a feeding preheater 8 and a water feeding preheater 9. The smoke inlet of the high-parameter steam boiler 6 is connected with the smoke outlet of the gas burner 5, and the smoke outlet of the high-parameter steam boiler 6 is connected with the smoke inlet of the carbonate external heating calcining kiln 7. High-temperature flue gas at the temperature of nearly 2000 ℃ generated by the gas burner 5 is sent into a high-parameter steam boiler 6 to release heat and reduce the temperature to 1200-1300 ℃, and then the flue gas is sent into a carbonate external heating type calcining kiln 7 to heat and calcine carbonate materials in the kiln, and the carbonate materials are calcined and decomposed to generate a large amount of CO at the temperature of 850-950 DEG C2A gas. The high-parameter steam boiler 6 absorbs heat emitted by high-temperature flue gas, the temperature of the high-temperature flue gas entering the carbonate external heating type calcining kiln 7 for calcining materials is controlled to be 1200-1300 ℃, high-temperature high-pressure steam of 9.8MPa and 540 ℃ is generated at the same time, and the high-temperature high-pressure steam is sent into a steam pipe network for utilization or is sent into a steam turbine generator unit for power generation. The high-temperature flue gas of 900-950 ℃ discharged from the carbonate external heating calcining kiln 7 then enters an air preheating unit and a gas preheating unit to preheat the air and the gas fed into the gas burner 5, the air is preheated to 500-700 ℃ finally, and the gas is preheated to 400-500 ℃ finally.
This embodiment the air preheating unit contains first air heater 1 and second air heater 2 that connect gradually, and the air outlet of first air heater 1 links to each other with second air heater 2's air inlet, and second air heater 2's air outlet links to each other with gas burner 5's air inlet. The gas preheating unit comprises a first gas preheater 3 and a second gas preheater 4 which are connected in sequence, a gas outlet of the first gas preheater 3 is connected with a gas inlet of the second gas preheater 4, and a gas outlet of the second gas preheater 4 is connected with a gas inlet of the gas burner 5.
CO of the first air preheater 12CO from inlet to carbonate external heating calcining kiln 72The outlets are connected, and the carbonate external heating type calcining kiln 7 calcines the CO generated by the carbonate material and discharges the CO2The temperature of the gas is about 850-950 ℃. CO of the first air preheater 12CO exiting the first gas preheater 32Inlet connected, CO of the first gas preheater 32Outlet and CO2The recovery device is connected. 850-950 ℃ CO discharged from carbonate external heating calcining kiln 72The gas sequentially passes through a first air preheater 1 and a first gas preheater 3, and the air and the gas which are fed into a gas burner 5 to participate in combustion are primarily heated and heated, the air is preheated to 300-400 ℃, and the gas is preheated to 200-300 ℃; CO after heat release and temperature reduction2The gas temperature is reduced to below 120 ℃ and discharged from the first gas preheater 3, and then is fed into CO2The recovery device is used for recovery.
The flue gas inlet of the second air preheater 2 is connected with the flue gas outlet of the carbonate external heating calcining kiln 7, the flue gas outlet of the second air preheater 2 is connected with the flue gas inlet of the second gas preheater 4, and the flue gas outlet of the second gas preheater 4 is connected with the flue gas inlet of the feed preheater 8. After heating and calcining the carbonate material, high-temperature flue gas at 900-950 ℃ discharged by an external heating type calcining kiln 7 of the carbonate sequentially passes through a second air preheater 2 and a second gas preheater 4, and further heats the air and the gas which are fed into a gas burner 5 to participate in combustion respectively, wherein the temperature of the air is increased to 500-700 ℃, and the temperature of the gas is increased to 400-500 ℃; the heated air and fuel gas are fed into a fuel gas burner 5 for combustion, high-temperature flue gas with the temperature of about 2000 ℃ is generated after combustion, and then the flue gas enters a high-parameter steam boiler 6 for cooling and heat recovery.
The feed preheater 8 is used for recovering the heat of the medium-temperature flue gas discharged by the second gas preheater 4 to heat and raise the temperature of the carbonate material fed into the carbonate external heating type calcining kiln 7. The temperature of the low-temperature flue gas after heat exchange and temperature reduction by the feed preheater 8 is about 100-200 ℃, and then the low-temperature flue gas is sent into the feed water preheater 9 to continuously recover heat.
In this embodiment, the flue gas inlet of the feed water preheater 9 is connected to the flue gas outlet of the feed water preheater 8, and the water outlet of the feed water preheater 9 is connected to the feed water inlet of the high parameter steam boiler 6. The heat of the low-temperature flue gas with the temperature of 100-200 ℃ from the feed preheater 8 is further recovered through the feed water preheater 9, the feed water of the high-parameter steam boiler 6 is preheated, and meanwhile, the temperature of the low-temperature flue gas is reduced to be about 10 ℃ higher than the dew point temperature of the local flue gas. The flue gas cooled by the feed water preheater 9 is sent into a smoke exhaust purification device for purification and then is discharged.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (9)

1. A low-carbon emission combustion heating system of a carbonate external heating type calcining kiln is characterized by comprising an air preheating unit, a gas burner, a steam boiler, an external heating type calcining kiln, a feeding preheater and a water supply preheater;
the air preheating unit and the gas preheating unit recycle flue gas and CO discharged by the carbonate external heating calcining kiln2The heat of the gas heats the air and the gas respectively and then the air and the gas are conveyed to a gas burner;
the steam boiler is used for recovering partial heat in the flue gas discharged by the gas burner to heat the feed water so as to control the temperature of the flue gas entering the external heating calcining kiln and simultaneously produce steam;
the feeding preheater is used for recovering the heat of the flue gas discharged by the gas preheating unit to heat the carbonate material fed into the carbonate external heating calcining kiln;
the feed water preheater is used for recovering the heat of the flue gas discharged by the feeding preheater and preheating the feed water fed into the steam boiler.
2. The low carbon emission combustion heating system of an externally heated carbonate calciner according to claim 1, wherein the air preheater unit comprises a first air preheater and a second air preheater which are connected in series along the air conveying direction, and the air outlet of the second air preheater is connected to the air inlet of the gas burner; the gas preheating unit comprises a first gas preheater and a second gas preheater which are sequentially connected along the gas conveying direction, and the gas outlet of the second gas preheater is connected with the gas inlet of the gas burner.
3. The low carbon emission combustion heating system of the carbonate externally heated calciner of claim 2, wherein the flue gas outlet of the externally heated calciner is connected with a second air preheater, a second gas preheater and a feed preheater in sequence, and the CO of the externally heated calciner is connected with a CO preheater of the externally heated calciner2The outlet is connected with the first air preheater and the first gas preheater in sequence.
4. The low carbon emission combustion heating system of an externally heated carbonate calciner according to claim 3, wherein the CO of the first gas preheater2The outlet is connected to CO2And (5) a recovery device.
5. The low carbon emission combustion heating system of the carbonate externally heated calcining kiln, according to claim 1, wherein the discharge port of the feed preheater is connected with the feed port of the externally heated calcining kiln, the flue gas inlet of the feed preheater is connected with the flue gas outlet of the gas preheating unit, and the flue gas outlet of the feed preheater is connected with the flue gas inlet of the water supply preheater.
6. The low carbon emission combustion heating system of the externally heated carbonate calciner of claim 1 wherein the flue gas inlet of the feed water preheater is connected to the flue gas outlet of the feed preheater and the water outlet of the feed water preheater is connected to the feed water inlet of the steam boiler.
7. The low carbon emission combustion heating system of the carbonate external heating type calcining kiln according to claim 6, wherein the flue gas outlet of the feed water preheater is connected with a smoke exhaust purification device.
8. The low carbon emission combustion heating system of the externally heated carbonate calciner of claim 1, wherein the flue gas inlet of the steam boiler is connected to the flue gas outlet of the gas burner, and the flue gas outlet of the steam boiler is connected to the flue gas inlet of the externally heated calciner.
9. The low carbon emission combustion heating system of the externally heated carbonate calciner according to claim 8, wherein the steam outlet of the steam boiler is externally connected to a steam pipe network or a steam turbine generator unit.
CN202122767790.4U 2021-11-12 2021-11-12 Low-carbon emission combustion heating system of carbonate external heating type calcining kiln Active CN216620694U (en)

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CN202122767790.4U CN216620694U (en) 2021-11-12 2021-11-12 Low-carbon emission combustion heating system of carbonate external heating type calcining kiln

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