CN108404865B - Active coke regeneration system and method - Google Patents
Active coke regeneration system and method Download PDFInfo
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- CN108404865B CN108404865B CN201810377244.XA CN201810377244A CN108404865B CN 108404865 B CN108404865 B CN 108404865B CN 201810377244 A CN201810377244 A CN 201810377244A CN 108404865 B CN108404865 B CN 108404865B
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- heat exchanger
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- heating furnace
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- 238000011069 regeneration method Methods 0.000 title claims abstract description 93
- 239000000571 coke Substances 0.000 title claims abstract description 88
- 230000008929 regeneration Effects 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 17
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000003546 flue gas Substances 0.000 claims abstract description 48
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 238000001816 cooling Methods 0.000 claims abstract description 40
- 238000002485 combustion reaction Methods 0.000 claims abstract description 38
- 239000003034 coal gas Substances 0.000 claims abstract description 18
- 238000001179 sorption measurement Methods 0.000 claims abstract description 9
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 50
- 239000011261 inert gas Substances 0.000 claims description 25
- 238000007599 discharging Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 230000001172 regenerating effect Effects 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 4
- 239000002918 waste heat Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3416—Regenerating or reactivating of sorbents or filter aids comprising free carbon, e.g. activated carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3483—Regenerating or reactivating by thermal treatment not covered by groups B01J20/3441 - B01J20/3475, e.g. by heating or cooling
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Coke Industry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to an active coke regeneration system and a method, wherein the system comprises a regeneration tower and a heating furnace; in the descending process of the adsorption saturated active coke in the regeneration tower, the adsorption saturated active coke exchanges heat with a regeneration heat exchanger to realize the regeneration of the active coke, exchanges heat with a precooling heat exchanger and a cooling heat exchanger to realize the cooling of the active coke, the regeneration heat exchanger adopts the flue gas at the outlet of a heating furnace, the precooling heat exchanger and the cooling heat exchanger respectively adopt combustion air and surplus coal gas, and the combustion air and the surplus coal gas after heat exchange are sent into the heating furnace to be combusted. According to the active coke regeneration system and the method, the pre-cooling heat exchanger and the cooling heat exchanger are used for cooling the parsed active coke in sequence, so that the cooling quality of the active coke can be ensured, the breakage rate of the active coke is reduced, meanwhile, the waste heat of the active coke is utilized to the maximum extent, the sensible heat of combustion air and coal gas for a heating furnace is effectively improved, and the stable combustion of the coal gas is ensured, so that the system and the method are suitable for the utilization of low-heat-value coal gas, and the waste heat and residual energy resources of the metallurgical industry are fully utilized.
Description
Technical Field
The invention relates to an active coke regeneration system and method, and belongs to the technical field of energy conservation and environmental protection.
Background
The active coke flue gas purification technology is to treat pollutants in flue gas by utilizing the strong adsorption function of active coke, and can remove various pollutants simultaneously. With the increasingly stringent environmental protection requirements, activated coke flue gas purification technology is popular in the metallurgical industry.
The activated coke after the flue gas treatment needs to be heated, analyzed and regenerated, so that the recycling of the activated coke is realized. The low-heat-value gas in the metallurgical industry is sufficient, but the heat value is low, the low-heat-value gas is not easy to burn, and no technology for applying the low-heat-value gas to the field of active coke analysis and regeneration exists at present.
Disclosure of Invention
The embodiment of the invention relates to an active coke regeneration system and an active coke regeneration method, which can at least solve part of defects in the prior art.
The embodiment of the invention relates to an active coke regeneration system, which comprises a regeneration tower and a heating furnace, wherein the regeneration tower comprises a heating furnace, a heating furnace and a cooling tower;
a regeneration heat exchanger, a precooling heat exchanger and a cooling heat exchanger are sequentially arranged in the regeneration tower from top to bottom;
The flue gas outlet of the heating furnace is communicated with the heat exchange medium inlet of the regenerative heat exchanger, and the heat exchange medium outlet of the regenerative heat exchanger is communicated with the flue gas inlet of the heating furnace through a first flue gas pipeline;
a heat exchange medium inlet of the precooling heat exchanger is connected with a combustion air ingress pipe, and a heat exchange medium outlet is communicated with a combustion air inlet of the heating furnace;
and a heat exchange medium inlet of the cooling heat exchanger is connected with a gas inlet pipe, and a heat exchange medium outlet is communicated with a gas inlet of the heating furnace.
As one of the embodiments, the regeneration tower includes a discharging section above the regeneration heat exchanger and a discharging section above the cooling heat exchanger, where the discharging section and the discharging section are both provided with inert gas inlets.
As one of the embodiments, the active coke regeneration system further comprises an external heat exchanger, wherein the external heat exchanger is communicated with a heat exchange medium outlet of the regeneration heat exchanger through a second flue gas pipeline; the external heat exchanger is provided with an inert gas inlet and an inert gas outlet, and the inert gas outlet is communicated with at least one inert gas inlet.
As one embodiment, the first flue gas pipeline is provided with a control valve.
As one of the embodiments, the combustion air inlet pipe is communicated with a hot air outlet of the sintering circular cooler or a hot air outlet of the sinter vertical cooling furnace.
As one example, the gas feed pipe is connected to a blast furnace gas line or a coke oven gas line.
The embodiment of the invention relates to an active coke regeneration method, which comprises the following steps:
feeding the activated coke saturated by adsorption into a regeneration tower;
heat exchange is carried out between the active coke and a regeneration heat exchanger in a regeneration tower in the descending process of the active coke, and adsorbed gas is analyzed;
The method comprises the steps of sequentially adopting combustion air and surplus coal gas of a steel mill to indirectly cool regenerated active coke, sending the heat-exchanged combustion air and the surplus coal gas into a heating furnace for combustion, sending outlet flue gas of the heating furnace into a regeneration heat exchanger, and returning the outlet flue gas of the regeneration heat exchanger to a hearth of the heating furnace at least partially.
As one example, the combustion air used comprises hot air produced by other processes in a steel mill at a temperature of 150-300 ℃.
As one of the embodiments, a part of the outlet flue gas of the regenerator is used for exchanging heat with the inert gas, and the heated inert gas is sent to the regenerator to realize the top gas seal of the regenerator.
As one example, the surplus gas used includes blast furnace gas.
The embodiment of the invention has at least the following beneficial effects:
According to the active coke regeneration system provided by the invention, the pre-cooling heat exchanger and the cooling heat exchanger are used for cooling the parsed active coke in sequence, so that the cooling quality of the active coke can be ensured, the breakage rate of the active coke is reduced, meanwhile, the waste heat of the active coke is utilized to the maximum extent, the sensible heat of combustion air and coal gas for a heating furnace is effectively improved, and the stable combustion of the coal gas is ensured, so that the active coke regeneration system is suitable for the utilization of low-heat-value coal gas, and the waste heat and residual energy resources of the metallurgical industry are fully utilized.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an active coke regeneration system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, an embodiment of the present invention provides an active coke regeneration system comprising a regeneration tower 1 and a heating furnace 2; a regeneration heat exchanger 102, a precooling heat exchanger 103 and a cooling heat exchanger 104 are sequentially arranged in the regeneration tower 1 from top to bottom; the flue gas outlet of the heating furnace 2 is communicated with the heat exchange medium inlet of the regeneration heat exchanger 102, and the heat exchange medium outlet of the regeneration heat exchanger 102 is communicated with the flue gas inlet of the heating furnace 2 through a first flue gas pipeline 4; a heat exchange medium inlet of the pre-cooling heat exchanger 103 is connected with a combustion air inlet pipe 6, and a heat exchange medium outlet is communicated with a combustion air inlet of the heating furnace 2; the heat exchange medium inlet of the cooling heat exchanger 104 is connected with a gas inlet pipe 5, and the heat exchange medium outlet is communicated with the gas inlet of the heating furnace 2. Generally, a feed inlet is disposed at the top of the regeneration tower 1, a blanking section 101 is correspondingly formed between the feed inlet and the regeneration heat exchanger 102, a regeneration section is correspondingly formed in a region where the regeneration heat exchanger 102 is located, a pre-cooling section is correspondingly formed in a region where the pre-cooling heat exchanger 103 is located, a cooling section is correspondingly formed in a region where the cooling heat exchanger 104 is located, a discharge outlet is disposed at the bottom of the regeneration tower 1, and a discharge section 105 is correspondingly formed between the discharge outlet and the cooling heat exchanger 104. The active coke with saturated adsorption enters the regeneration tower 1 through a feed inlet, and exchanges heat with corresponding heat exchange media respectively through the regeneration heat exchanger 102, the precooling heat exchanger 103 and the cooling heat exchanger 104 in sequence, wherein flue gas discharged from the heating furnace 2 is introduced into the regeneration heat exchanger 102, so that the active coke is heated to a certain temperature, the adsorbed gas in the active coke is analyzed, and the regeneration of the active coke is realized; the combustion air enters the pre-cooling heat exchanger 103, so that the parsed active coke can be pre-cooled, and meanwhile, the part of combustion air is heated, so that the combustion effect of fuel gas in the heating furnace 2 can be improved, and for the fuel gas adopting low-heat-value gas, the stable combustion of the low-heat-value gas is facilitated; the activated coke continues to move down to the cooling section, the introduced gas flows through the cooling heat exchanger 104, the precooled activated coke can be cooled, and the heated gas is sent into the heating furnace 2 to be used as fuel for combustion, and heat is generated to heat the flue gas.
The active coke regeneration system provided by the embodiment sequentially cools the parsed active coke through the pre-cooling heat exchanger 103 and the cooling heat exchanger 104, so that the cooling quality of the active coke can be ensured, the breakage rate of the active coke is reduced, meanwhile, the waste heat of the active coke is utilized to the maximum extent, the sensible heat of combustion air and coal gas for the heating furnace 2 is effectively improved, the stable combustion of the coal gas is ensured, and therefore, the active coke regeneration system is suitable for the utilization of low-heat-value coal gas, and the waste heat and residual energy resources of the metallurgical industry are fully utilized. That is, the above-mentioned gas introduction pipe 5 is preferably introduced with a low heating value gas such as blast furnace gas, coke oven gas, or the like (i.e., the gas introduction pipe 5 is connected to a blast furnace gas line or a coke oven gas line).
Further preferably, the above-mentioned blanking section 101 above the regenerator 102 and the discharging section 105 above the cooling heat exchanger 104 are both provided with inert gas inlets, and the top and bottom of the regenerator 1 are sealed with inert gas, so as to ensure the operation safety of the system. As shown in fig. 1, preferably, the active coke regeneration system further comprises an external heat exchanger 3, and the external heat exchanger 3 is communicated with a heat exchange medium outlet of the regeneration heat exchanger 102 through a second flue gas pipeline; the external heat exchanger 3 has an inert gas inlet and an inert gas outlet, and the inert gas outlet is communicated with at least one inert gas inlet. Part of the outlet flue gas of the regeneration heat exchanger 102 enters the outer heat exchanger 3 to heat inert gas, so that the waste heat of high-temperature flue gas can be fully utilized; the heated inert gas is preferably sent into the blanking section 101 for gas sealing at the top of the regeneration tower 1, and active coke can be preheated. The inert gas used is typically N 2.
The outlet flue gas of the regeneration heat exchanger 102 enters the heating furnace 2 for recycling flue gas, so that the waste heat of the flue gas can be utilized, the combustion temperature of the heating furnace 2 can be reduced, the outlet temperature of the flue gas of the heating furnace 2 is reduced, the temperature difference between the flue gas and active coke is reduced, and the heat exchange loss of the regeneration heat exchanger 102 is reduced. Further preferably, as shown in fig. 1, a control valve is provided on the first flue gas pipeline 4, and the amount of flue gas returned to the heating furnace 2 can be adjusted to properly allocate the circulating flue gas amount, so as to ensure the stable operation of the system.
In another embodiment, a sub-heat exchanger may be disposed below the cooling heat exchanger 104, and the flue gas outlet of the external heat exchanger 3 is connected to the flue gas inlet of the sub-heat exchanger through a third flue gas pipeline, so as to ensure the cooling effect on the active coke.
Further optimizing the active coke regeneration system, as shown in fig. 1, the combustion air inlet pipe 6 is preferably hot air (generally hot air generated after heat exchange in a cooling process) generated by other processes in the metallurgical industry, and as a preferred embodiment, the combustion air inlet pipe 6 is communicated with a hot air outlet of a sintering circular cooler or a hot air outlet of a sinter vertical cooling furnace, and the temperatures of the hot air are generally 150-300 ℃, so that waste heat and residual energy in the metallurgical industry are fully utilized, the combustion effect of coal gas can be improved, and the energy consumption of the heating furnace 2 can be reduced.
As a possible embodiment, for the structure adopting the blast furnace gas/coke oven gas as the fuel of the heating furnace 2, after the active coke is adopted to purify the blast furnace gas/coke oven gas in advance, the blast furnace gas/coke oven gas is sequentially sent into the regeneration tower 1 to exchange heat and is sent into the heating furnace 2 to burn, so that the burning effect of the part of low-heat-value gas can be ensured, and the blast furnace gas/coke oven gas is easier to be applied to the technical field of active coke regeneration. The part of active coke can be regenerated by adopting the regenerated active coke discharged from the regeneration tower 1 nearby, and the active coke with saturated adsorption can be returned to the regeneration tower 1 for regeneration, so that the production operation is easy.
The embodiment of the invention also relates to an active coke regeneration method which can be realized based on the active coke regeneration system, and specifically comprises the following steps:
Feeding the activated coke saturated by adsorption into a regeneration tower 1;
in the descending process of the active coke, exchanging heat with a regeneration heat exchanger 102 in the regeneration tower 1, and analyzing adsorbed gas;
The regenerated active coke is indirectly cooled by adopting combustion air and surplus coal gas of a steel mill in sequence, the combustion air and the surplus coal gas after heat exchange are sent to the heating furnace 2 for combustion, the flue gas at the outlet of the heating furnace 2 is sent to the regeneration heat exchanger 102, and the flue gas at the outlet of the regeneration heat exchanger 102 is at least partially returned to the hearth of the heating furnace 2.
Wherein, as the preference, the combustion air adopted comprises hot air generated by other processes of a steel plant, and the temperature is 150-300 ℃; the surplus gas used comprises blast furnace gas. In addition, a part of the outlet flue gas of the regenerator 102 is used for exchanging heat with inert gas, and the heated inert gas is sent to the regenerator 1 to realize gas seal at the top of the regenerator 1.
The implementation of this active coke regeneration method is described in the above-described active coke regeneration system embodiments, and those skilled in the art will accordingly refer to/expand the same, which is omitted herein.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. An active burnt regeneration system, includes regeneration tower, its characterized in that: the heating furnace is also included;
a regeneration heat exchanger, a precooling heat exchanger and a cooling heat exchanger are sequentially arranged in the regeneration tower from top to bottom;
The flue gas outlet of the heating furnace is communicated with the heat exchange medium inlet of the regenerative heat exchanger, and the heat exchange medium outlet of the regenerative heat exchanger is communicated with the flue gas inlet of the heating furnace through a first flue gas pipeline; the outlet flue gas of the regenerative heat exchanger is at least partially returned to the hearth of the heating furnace, and a control valve is arranged on the first flue gas pipeline and is used for adjusting the amount of flue gas returned to the heating furnace and adjusting the amount of circulating flue gas, so that the temperature of the outlet flue gas of the heating furnace is reduced, and the temperature difference between the flue gas and active coke is reduced;
A heat exchange medium inlet of the precooling heat exchanger is connected with a combustion air ingress pipe, and a heat exchange medium outlet is communicated with a combustion air inlet of the heating furnace; the combustion air ingress pipe is communicated with a hot air outlet of a sintering circular cooler or a hot air outlet of a sintering ore vertical cooling furnace, and the inlet air temperature of the combustion air ingress pipe is 150-300 ℃;
a heat exchange medium inlet of the cooling heat exchanger is connected with a gas inlet pipe, and a heat exchange medium outlet is communicated with a gas inlet of the heating furnace; the gas inlet pipe is used for introducing low-heat-value gas, including blast furnace gas or coke oven gas, wherein after the low-heat-value gas is purified by active coke in advance, the low-heat-value gas is sequentially sent into a regeneration tower for heat exchange and is sent into a heating furnace for combustion, the part of active coke is regenerated active coke discharged by the regeneration tower nearby, and the active coke with saturated adsorption returns to the regeneration tower for regeneration.
2. The active coke regeneration system of claim 1, wherein: the regeneration tower comprises a blanking section positioned above the regeneration heat exchanger and a discharging section positioned above the cooling heat exchanger, wherein the blanking section and the discharging section are both provided with inert gas inlets.
3. The active coke regeneration system of claim 2, wherein: the heat exchange medium outlet of the regeneration heat exchanger is communicated with the heat exchange medium outlet of the tower external heat exchanger through a second flue gas pipeline; the external heat exchanger is provided with an inert gas inlet and an inert gas outlet, and the inert gas outlet is communicated with at least one inert gas inlet.
4. A method of active coke regeneration, characterized in that it is implemented on the basis of an active coke regeneration system according to any one of claims 1 to 3, comprising:
feeding the activated coke saturated by adsorption into a regeneration tower;
heat exchange is carried out between the active coke and a regeneration heat exchanger in a regeneration tower in the descending process of the active coke, and adsorbed gas is analyzed;
The method comprises the steps of sequentially adopting combustion air and surplus coal gas of a steel mill to indirectly cool regenerated active coke, sending the heat-exchanged combustion air and the surplus coal gas into a heating furnace for combustion, sending outlet flue gas of the heating furnace into a regeneration heat exchanger, and returning the outlet flue gas of the regeneration heat exchanger to a hearth of the heating furnace at least partially.
5. The active coke regeneration method according to claim 4, characterized in that: and the outlet flue gas of a part of the regeneration heat exchanger is used for exchanging heat with the inert gas, and the heated inert gas is sent into the regeneration tower to realize gas seal at the top of the regeneration tower.
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| CN201810377244.XA CN108404865B (en) | 2018-04-25 | 2018-04-25 | Active coke regeneration system and method |
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| CN201810377244.XA CN108404865B (en) | 2018-04-25 | 2018-04-25 | Active coke regeneration system and method |
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| CN108404865A CN108404865A (en) | 2018-08-17 |
| CN108404865B true CN108404865B (en) | 2024-06-07 |
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| CN112985081A (en) * | 2021-02-04 | 2021-06-18 | 山东祥桓环境科技有限公司 | High-temperature regenerative gas heating device and process |
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| CN208373102U (en) * | 2018-04-25 | 2019-01-15 | 武汉都市环保工程技术股份有限公司 | Active coke regeneration system and sintering flue gas desulfurization denitration process system |
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2018
- 2018-04-25 CN CN201810377244.XA patent/CN108404865B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1817446A (en) * | 2006-01-16 | 2006-08-16 | 史鱼海 | Movable sulfurization active carbon heating regenerator and regeneration |
| CN102580706A (en) * | 2012-02-29 | 2012-07-18 | 上海克硫环保科技股份有限公司 | Heat exchange type active coke purifying and generating process system and heat exchange type active coke purifying and generating process method |
| CN104190388A (en) * | 2014-08-27 | 2014-12-10 | 中冶长天国际工程有限责任公司 | Activated carbon thermal desorption method and device capable of utilizing afterheat |
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