CN114413638A - Method for recovering calcination waste heat in process of producing coal-based needle coke - Google Patents
Method for recovering calcination waste heat in process of producing coal-based needle coke Download PDFInfo
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- CN114413638A CN114413638A CN202210107298.0A CN202210107298A CN114413638A CN 114413638 A CN114413638 A CN 114413638A CN 202210107298 A CN202210107298 A CN 202210107298A CN 114413638 A CN114413638 A CN 114413638A
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- waste
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- incinerator
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- 239000002918 waste heat Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000001354 calcination Methods 0.000 title claims abstract description 21
- 239000011311 coal-based needle coke Substances 0.000 title claims abstract description 7
- 239000003546 flue gas Substances 0.000 claims abstract description 57
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000002699 waste material Substances 0.000 claims abstract description 35
- 239000002912 waste gas Substances 0.000 claims abstract description 24
- 239000002351 wastewater Substances 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 230000018044 dehydration Effects 0.000 claims abstract description 5
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims abstract description 3
- 239000011331 needle coke Substances 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 12
- 239000000428 dust Substances 0.000 claims description 8
- 239000003345 natural gas Substances 0.000 claims description 6
- 238000000746 purification Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 239000002010 green coke Substances 0.000 claims description 2
- 238000011084 recovery Methods 0.000 description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000000571 coke Substances 0.000 description 6
- 238000004939 coking Methods 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 238000004064 recycling Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
-
- 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
Abstract
The invention relates to a method for recovering calcination waste heat in the process of producing coal-based needle coke, which comprises the following steps: introducing high-temperature waste flue gas generated by the rotary kiln, oily wastewater and waste gas generated in the production process into an incinerator, and incinerating the waste flue gas, the oily wastewater and the waste gas of the rotary kiln by using the incinerator; the hot clean flue gas generated by the incinerator firstly utilizes a waste heat boiler to generate steam and is sent to a steam pipe network; the flue gas cooled by the waste heat boiler passes through a heat conduction oil heating furnace to heat the heat conduction oil in the production equipment system; flue gas after the heat transfer oil heating furnace cooling carries out the denitration through denitrification facility earlier, and rethread air heat exchanger continues to heat clean air, and the clean air through the heat transfer is as the heat source of moisture material dehydration. The invention solves the problem of heat waste of high-temperature waste flue gas of the calcining unit, and simultaneously solves the problem of discharge of oily waste water and waste gas in the production process.
Description
Technical Field
The invention relates to the technical field of chemical industry, and relates to a method for recovering calcination waste heat in a process of producing coal-based needle coke.
Background
The waste flue gas of the high-temperature calcining unit on the needle coke production project is directly discharged through simple treatment, thereby wasting huge heat and causing bad influence on the environment. Therefore, those skilled in the art have tried to recycle the high-temperature waste flue gas to reduce environmental pollution and save energy.
Chinese patent application 201910314688.3 relates to a process and a flue gas treatment system for closed-circuit regulation of rotary kiln calcination of needle coke, and provides a process and a flue gas treatment system for closed-circuit regulation of rotary kiln calcination of needle coke. However, in the aspect of waste heat recovery of the flue gas treatment system related to the patent application, only one waste heat boiler is provided, and high-temperature flue gas is not fully utilized.
Chinese patent application 201822069377.9 relates to needle coke calcination flue gas waste heat recovery boiler, and this patent relates to a needle coke calcination flue gas waste heat recovery boiler, including the boiler furnace body, the flue gas intake pipe is connected to top one side of boiler furnace body, and flue gas outlet duct is connected to boiler furnace body bottom one side, and boiler furnace body is inside from last medium pressure evaporimeter, medium pressure over heater, first low pressure evaporimeter, low pressure over heater and the low pressure evaporimeter of second down having set gradually. The patent only relates to the aspect of waste heat recovery, only utilizes a waste heat boiler to produce various steam, and does not fully utilize high-temperature flue gas.
Chinese patent application 201220395481.7 relates to a system for recycling high temperature flue gas waste heat of a rotary kiln in a needle coke production process, which heats heat transfer oil and a waste heat boiler, but the system is a common waste heat recycling method with separate heating, and although the heat transfer oil at the back supplies heat to other heat exchange equipment, the heat efficiency of recycling is not high.
Therefore, how to utilize the heat of the waste flue gas of the high-temperature calcination unit to the maximum extent so that the whole production process is kept environment-friendly, safe and efficient is still a technical problem to be solved in the field.
Disclosure of Invention
Based on the problems of the prior art described above, the object of the present invention is: the utility model provides a be used for needle coke to calcine waste heat recovery equipment, has solved the extravagant heat and the influence to the environment of calcining the high temperature exhaust gas of unit, carries out combustion treatment discharge to oily waste water, waste gas, the dust that several processes produced before the coal series needle coke simultaneously.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
the invention relates to a method for recovering calcination waste heat in the process of producing coal-based needle coke, which comprises the following steps: introducing high-temperature waste flue gas generated by the rotary kiln, oily wastewater and waste gas generated in the production process into an incinerator, and incinerating the waste flue gas, the oily wastewater and the waste gas of the rotary kiln by using the incinerator; the hot clean flue gas generated by the incinerator firstly utilizes a waste heat boiler to generate steam and is sent to a steam pipe network; the flue gas cooled by the waste heat boiler passes through a heat conduction oil heating furnace to heat the heat conduction oil in the production equipment system; flue gas after the heat transfer oil heating furnace cooling carries out the denitration through denitrification facility earlier, and rethread air heat exchanger continues to heat clean air, and the clean air through the heat transfer is as the heat source of moisture material dehydration. The denitration device is organically added, the heat energy of the flue gas is utilized to the maximum extent, and the whole factory is ensured to be ahead of other peers in the energy-saving and environment-friendly pollution prevention and treatment process.
The main working principle of the incinerator is that the waste gas and waste liquid produced by the needle coke production device are subjected to high-temperature thermal oxidation treatment in the incinerator, so that toxic and harmful organic matters in the waste gas and waste liquid are thoroughly oxidized and decomposed. The waste liquid uses superheated steam to assist the atomizing to spout into through the waste liquid spray gun and burns burning furnace, improves atomizing quality and degree of consistency. The coking gas is mixed with air by a coking gas spray gun and then is sprayed into the incinerator, so that the coking gas is fully combusted. Other waste gas is mixed and then sprayed into the incinerator through the flue gas nozzle, and is mixed and stirred with high-temperature flue gas and then combusted. Oxygen required by the incinerator is sprayed into the incinerator from different positions through a waste gas combustion fan, so that the incinerator is guaranteed to be burnt in a reasonable oxygen content range.
The waste heat boiler of the invention heats the water temperature of the feed water through a feed water pump and a feed water regulating valve group and a coal economizer and then enters a steam drum, saturated water in the steam drum is heated through a downcomer, a circulating pump and an ascending pipe through an evaporator and an evaporator of a water protection section to form a steam-water mixture and then is sent into the steam drum, and saturated steam generated by the steam drum is supplied to a device.
The heat conduction oil system heats oil temperature through a heat conduction oil heater by an oil return pump with high temperature heat conduction oil and then carries out heat exchange for a high temperature user, the oil return after heat exchange firstly enters an oil-gas separator, and the separated oil return of the oil-gas separator returns to the high temperature circulation pump; the mixed oil gas separated by the oil-gas separator enters an expansion tank, and the expansion tank overflows to an oil storage tank through an overflow pipe. After a part of high-temperature oil of the high-temperature heat conduction oil is mixed with a part of low-temperature return oil of a low-temperature user, the high-temperature oil is supplied to the low-temperature user for heat exchange through the low-temperature circulating pump, and the other part of the low-temperature return oil returns to the expansion tank.
In a preferred embodiment of the invention, the aqueous feed is aqueous green coke and the dewatering is carried out in a rotary drying kiln.
In a preferred embodiment of the present invention, the flue gas is discharged after being subjected to dust removal and purification after being subjected to heat exchange by an air heat exchanger.
In a preferred embodiment of the present invention, two natural gas burners are arranged in a staggered opposed manner in the lower region of the incinerator, the nozzles for the exhaust gas and waste liquid from the needle coke production apparatus are arranged on the side wall of the incinerator, the exhaust gas and waste liquid are injected into the incinerator from the upper part of the burners to be incinerated and oxidized, and the outlet temperature of the incinerator is set to 850 ℃ to 1200 ℃. In another preferred embodiment of the present invention, the temperature of the high temperature waste flue gas generated by the rotary kiln is 900-. The high-temperature waste flue gas is beneficial to burning organic substances in the oily wastewater and reducing the wastewater discharge.
The invention has the beneficial effects that: the waste of heat of high-temperature waste flue gas of the calcining unit is solved, and the discharge of oily waste water and waste gas in the production process is also solved. Particularly, the waste heat recovery system fully utilizes the heat energy of high-temperature flue gas (more than 900 ℃) of the calcining rotary kiln, the waste heat recovery system comprises an incinerator, a waste heat boiler, a heat conduction oil heating furnace, an air heating device and a denitration device, the system utilizes the heat of calcining tail gas to the maximum extent, and the system is environment-friendly and high in efficiency.
Wherein, utilize burning furnace and high temperature waste flue gas, help burning the waste water of mill all, reduced the necessity of waste water treatment, saved a large amount of lands, avoided the secondary pollution of waste water, in needle coke mill, absolutely is the initiative.
Secondly, the waste heat recovery system is utilized to heat clean air and is used for a dehydration process required before raw coke enters the rotary kiln, so that the calcination effect of the needle coke is ensured, and energy is saved.
In addition, the invention can meet the requirement of the process with maximum efficiency by reasonably arranging the process sequence of the waste heat boiler, the heat-conducting oil heating furnace and the air heat exchanger, and can completely extract the heat energy of the high-temperature flue gas.
Drawings
FIG. 1 is a schematic diagram of a needle coke calcination waste heat recovery apparatus;
wherein, 1, a waste heat boiler; 2-a heat conducting oil heating furnace; 3-a denitration device; 4-an air heat exchanger; 5-a dust removal purification device; 6-combustion-supporting system; 7-flue gas and waste gas inlet; 8-waste gas, waste liquid nozzle; 9-an incinerator; 10-a waste heat recovery system; 11-a draught fan; 12-chimney.
FIG. 2 is a process flow diagram of needle coke calcination waste heat recovery.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a calcining waste heat recovery device used in the technical process of producing coal-based needle coke, which sequentially comprises an incinerator (9), a waste heat recovery system (10), a dust removal purification device (5), an induced draft fan (11) and a chimney (12) from upstream to downstream, wherein the incinerator (9) comprises a combustion-supporting system (6), a flue gas and waste gas inlet (7), and a waste gas and waste liquid nozzle (8); the waste heat recovery system sequentially comprises a waste heat boiler (1), a heat conduction oil heating furnace (2), a denitration device (3) and an air heat exchanger (4) from the upstream to the downstream.
The process flow of the invention is shown in figure 2, specifically, the coke-containing waste flue gas of the rotary kiln of the calcining unit and the oily waste water and waste gas generated in the previous working procedures respectively enter an incinerator (9) through a flue gas and waste gas inlet (7) and a waste gas and waste liquid nozzle (8) for incineration treatment, and the high-temperature coke-containing waste flue gas is utilized to help burn off organic matters and other oil substances in the waste water and waste gas. Clean flue gas at the outlet of the incinerator enters a waste heat boiler (1), and desalted water is subjected to heat exchange through a heat exchanger to form 0.8MPa saturated steam serving as industrial steam. Clean flue gas at the outlet of the waste heat boiler has high waste heat, and the flue gas is introduced into a heat conduction oil heating furnace (2) to heat conduction oil to the temperature required by the process so as to provide a heat source for the process. The flue gas after the cooling of the heat conduction oil heating furnace is firstly treated by the denitration device (3), and then is continuously heated by the air heat exchanger (4), so that the hot clean air is used as a heat source for coke dehydration. And finally, the flue gas is sent to a chimney (12) by an induced draft fan (11) after passing through a dust removal purification device (5) and is discharged in a qualified way.
The coke-containing waste flue gas entering the incinerator comprises the following components: CO 22：7.88％，O2：4.87％，H2O：21.88％，N2：65.35％，SO2: 0.02%, dust content: 6g/m3(Standard).
The flue gas after dust removal and purification is as follows: SO (SO)2：20.43mg/m3；NOx：43.6mg/m3(ii) a The particle is 9.2mg/m3, which reaches the environmental emission standard.
Comprehensively calculating the waste heat recovery efficiency of the coke-containing waste flue gas, wherein the waste heat recovery efficiency is between 78 and 86 percent and is measured by the following calculation formula:
the waste heat recovery efficiency is (Q3-Q2-Q4)/Q1 multiplied by 100%
Wherein:
q1: the heat contained in each gas (smoke, coking gas, oil medium diffused gas and the like) in the incinerator;
q2: the heat contained in the combustion-supporting natural gas;
q3: heat quantity required by heated medium (demineralized water, heat-conducting oil, cold air, denitration catalyst, etc.)
Q4: the heat brought by the exhausted smoke.
The waste heat recovery device of the invention is composed of an incineration system and a waste heat recovery system, natural gas is used as combustion-supporting fuel, two natural gas burners are arranged in the lower area of an incinerator in a staggered and opposite impact manner, a waste gas and waste liquid nozzle from a needle coke production device is arranged on the side wall of the incinerator, the waste gas and waste liquid nozzle is sprayed into the incinerator from the upper part of the burners for incineration and oxidation treatment, the outlet temperature of the incinerator is set to be 850-1200 ℃, and the incineration treatment of the waste gas and waste liquid is realized by adjusting fuel gas of the natural gas burners and an adjusting valve of an air door. The high-temperature clean flue gas after burning produces saturated steam, heating conduction oil, supplies heat for the denitration device, heats air and hot water for drying, etc. in the waste heat recovery system arranged at the rear part, and the flue gas is discharged to the atmosphere after reaching the environmental protection requirement after being treated.
The foregoing describes preferred embodiments of the present invention, but is not intended to limit the invention thereto. Modifications and variations of the embodiments disclosed herein may be made by those skilled in the art without departing from the scope and spirit of the invention.
Claims (5)
1. A method for recovering calcination waste heat in the process of producing coal-based needle coke comprises the following steps: introducing high-temperature waste flue gas generated by the rotary kiln, oily wastewater and waste gas generated in the production process into an incinerator, and incinerating the waste flue gas, the oily wastewater and the waste gas of the rotary kiln by using the incinerator; the hot clean flue gas generated by the incinerator firstly utilizes a waste heat boiler to generate steam and is sent to a steam pipe network; the flue gas cooled by the waste heat boiler passes through a heat conduction oil heating furnace to heat the heat conduction oil in the production equipment system; flue gas after the heat transfer oil heating furnace cooling carries out the denitration through denitrification facility earlier, and rethread air heat exchanger continues to heat clean air, and the clean air through the heat transfer is as the heat source of moisture material dehydration.
2. The method of claim 1, wherein the aqueous feed is aqueous green coke and the dewatering is performed in a rotary drying kiln.
3. The method of claim 1, wherein the flue gas is discharged after being subjected to dust removal and purification after being subjected to heat exchange through an air heat exchanger.
4. The method as claimed in claim 1, wherein the temperature of the high temperature waste flue gas generated by the rotary kiln is 900-1200 ℃, and the high temperature waste flue gas is beneficial to burning organic substances in the oily wastewater and reducing wastewater discharge.
5. The method according to claim 1, wherein two natural gas burners are arranged in a lower region of the incinerator in a staggered opposed manner, exhaust gas and waste liquid nozzles from the needle coke producing apparatus are arranged on a side wall of the incinerator, and are injected into the incinerator from an upper portion of the burners to perform incineration oxidation treatment, and an outlet temperature of the incinerator is set to 850 ℃ to 1200 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210107298.0A CN114413638A (en) | 2022-01-28 | 2022-01-28 | Method for recovering calcination waste heat in process of producing coal-based needle coke |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210107298.0A CN114413638A (en) | 2022-01-28 | 2022-01-28 | Method for recovering calcination waste heat in process of producing coal-based needle coke |
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| CN113843264A (en) * | 2021-10-18 | 2021-12-28 | 亚德（上海）环保系统有限公司 | Method and system for treating waste salt through microwave thermal desorption and oxidation |
| CN113864789A (en) * | 2021-09-16 | 2021-12-31 | 上海瑞鼎环境工程技术有限公司 | Incineration system for treating sulfur-containing, nitrogen-containing and salt-containing waste liquid |
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2022
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