CN215234247U - Active carbon regeneration system - Google Patents
Active carbon regeneration system Download PDFInfo
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- CN215234247U CN215234247U CN202121352966.3U CN202121352966U CN215234247U CN 215234247 U CN215234247 U CN 215234247U CN 202121352966 U CN202121352966 U CN 202121352966U CN 215234247 U CN215234247 U CN 215234247U
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 360
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 87
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Abstract
Disclosed is an activated carbon regeneration system including: the activated carbon regeneration furnace is provided with a high-temperature flue gas inlet, a regenerated carbon outlet and a waste gas outlet; a combustion system provided with a first combustion air inlet for receiving combustion air and configured to supply high-temperature flue gas to the activated carbon regeneration furnace; the flue gas and smoke heat exchanger is provided with a low-temperature side inlet which is communicated with a waste gas outlet of the activated carbon regeneration furnace to receive waste gas and a high-temperature side inlet which is used for receiving high-temperature heat exchange smoke gas, the waste gas and the high-temperature heat exchange smoke gas exchange heat in the flue gas and smoke heat exchanger to generate high-temperature waste gas and low-temperature heat exchange smoke gas, and the flue gas and smoke heat exchanger is also provided with a high-temperature side outlet which is used for discharging the high-temperature waste gas and a low-temperature side outlet which is used for discharging the low-temperature heat exchange smoke gas; the second combustion chamber is provided with a high-temperature waste gas inlet, a second combustion air inlet and a high-temperature heat exchange flue gas outlet, and the high-temperature heat exchange flue gas outlet supplies high-temperature heat exchange flue gas to the flue gas-smoke heat exchanger; the combustion air preheating system is provided with a low-temperature heat exchange gas inlet.
Description
Technical Field
The utility model relates to an active carbon is system again.
Background
Activated carbon is a carbonaceous material with a developed pore structure, has both physical adsorption and chemical adsorption properties, and is commonly used as an adsorbent due to the specific properties. Since activated carbon is easily saturated to reduce or lose its adsorption performance, the removal of impurities must be accomplished by frequent replacement of activated carbon. However, the preparation of 1t of high-quality activated carbon consumes about 8t of wood or 8t of raw coal, the carbon yield is about 12.5%, and a large amount of CO is discharged to the atmosphere in the process2CO, sulfides, and other gaseous contaminants. Therefore, the price of the new active carbon is generally higher, and the production cost can be greatly increased by replacing the new active carbon. Therefore, desorption regeneration of saturated activated carbon must be considered to reduce the operation cost, achieve the purpose of recycling, reduce waste of coal and wood resources, reduce greenhouse gas emission and reduce non-renewable energy consumption.
The activated carbon regeneration means that after the activated carbon is adsorbed for a certain period of time, the activated carbon is changed into saturated carbon due to the fact that the adsorption capacity of the activated carbon is reduced or completely lost as the activated carbon is blocked by the adsorbate, and the adsorbate is desorbed and decomposed from the saturated carbon in a regeneration mode, so that the activated carbon recovers the original adsorption characteristic and can be recycled. At present, a thermal regeneration method is a mature technology with the widest application range and the highest input utilization rate, but has the defects of high energy consumption, low energy utilization efficiency, incapability of recycling heat energy in the regeneration process of the activated carbon, large tail gas emission, high carbon loss rate and the like.
Therefore, there is still a need for an energy efficient activated carbon regeneration system: it can carry out cyclic utilization through the inside high temperature flue gas that produces in to regeneration process of active carbon regeneration system to can carry out multistage recovery to all the other heats, thereby greatly limit reduces the energy consumption among the hot active carbon regeneration process, reduces the charcoal loss, reduces exhaust emissions, promotes active carbon regeneration efficiency.
SUMMERY OF THE UTILITY MODEL
For this reason, this reality is novel provides an active carbon regeneration system, and it includes active carbon regeneration stove, combustion system, cigarette heat exchanger, second combustion chamber and combustion air system of preheating at least, wherein:
the activated carbon regeneration furnace is provided with a high-temperature flue gas inlet, a regenerated carbon outlet and a waste gas outlet, the high-temperature flue gas inlet is used for receiving high-temperature flue gas so as to perform thermal regeneration treatment on the raw carbon to generate regenerated carbon and waste gas, the regenerated carbon outlet is used for discharging the regenerated carbon, and the waste gas outlet is used for discharging the waste gas;
the combustion system is at least provided with a first combustion air inlet for receiving combustion air and is configured to be connected with a high-temperature flue gas inlet of the activated carbon regeneration furnace so as to supply the high-temperature flue gas to the activated carbon regeneration furnace;
the smoke heat exchanger is provided with a low-temperature side inlet which is communicated with a waste gas outlet of the activated carbon regeneration furnace to receive the waste gas and a high-temperature side inlet which is used for receiving high-temperature heat exchange smoke, the waste gas and the high-temperature heat exchange smoke exchange in the smoke heat exchanger to correspondingly generate high-temperature waste gas and low-temperature heat exchange smoke, and the smoke heat exchanger is also provided with a high-temperature side outlet which is used for discharging the high-temperature waste gas and a low-temperature side outlet which is used for discharging the low-temperature heat exchange smoke;
the secondary combustion chamber is at least provided with a high-temperature waste gas inlet, a second combustion air inlet and a high-temperature heat exchange smoke outlet, wherein the high-temperature waste gas inlet is communicated with a high-temperature side outlet of the smoke and smoke heat exchanger to receive the high-temperature waste gas, the second combustion air inlet is used for receiving combustion air to promote the combustion of the high-temperature waste gas in the secondary combustion chamber, and the high-temperature heat exchange smoke outlet is communicated with a high-temperature side inlet of the smoke and smoke heat exchanger to supply the high-temperature heat exchange smoke to the smoke and smoke heat exchanger;
the combustion-supporting air preheating system is at least provided with a low-temperature heat exchange gas inlet and a combustion-supporting air outlet, the low-temperature heat exchange gas inlet is communicated with a low-temperature side outlet of the smoke-fume heat exchanger and receives the low-temperature heat exchange smoke to promote preheating of combustion-supporting air, and the combustion-supporting air outlet is communicated with the first combustion-supporting air inlet and the second combustion-supporting air inlet to supply preheated combustion-supporting air to the combustion system and the secondary combustion chamber respectively.
Namely the utility model provides an active regeneration system is through setting up the cigarette heat exchanger, the high temperature heat transfer flue gas that burning waste gas produced in can the recycle second combustion chamber, and can make low temperature waste gas and high temperature heat transfer flue gas carry out the heat transfer at this cigarette heat exchanger, carry second combustion chamber after with waste gas heating on the one hand, help the effective and rapid combustion of waste gas, and reduce the energy consumption of second combustion chamber, and on the other hand will carry from cigarette heat exchanger exhaust low temperature heat transfer flue gas and preheat in the system in order to preheat combustion air, thereby still save combustion air and preheat the energy consumption of system. From this, according to the utility model discloses an active carbon regeneration system carries out cyclic utilization through the inside high temperature flue gas that produces in the regeneration process of active carbon regeneration system, is showing the energy consumption that reduces hot active carbon regeneration in-process to reduce exhaust emissions, promote active carbon regeneration efficiency.
The utility model discloses in the first variant that further provides, activated carbon regeneration system still includes exhaust-heat boiler, exhaust-heat boiler with at least some of combustion air preheating system links to each other in order to follow combustion air preheating system receives the flue gas waste heat, the flue gas waste heat promotes steam generation in the exhaust-heat boiler, and exhaust-heat boiler will steam supply to activated carbon regeneration stove.
More specifically, the activated carbon regeneration system according to the first modification further comprises a tail gas treatment system connected with the waste heat boiler to receive tail gas from the waste heat boiler and treat the tail gas.
The utility model discloses in the first variant that further provides, activated carbon regeneration system still includes exhaust-heat boiler, just the high temperature heat transfer exhanst gas outlet via exhaust-heat boiler with the high temperature side entry intercommunication of cigarette smoke heat exchanger makes to come from the high temperature heat transfer flue gas of two combustion chambers promotes steam generation in the exhaust-heat boiler, and exhaust-heat boiler will steam supply to activated carbon regeneration stove.
More specifically, the activated carbon regeneration system according to this second variant further comprises a tail gas treatment system arranged in connection with the combustion air preheating system to receive tail gas therefrom and treat it.
Furthermore, the above described activated carbon regeneration system according to the present invention may optionally also comprise one or more of the following further developments.
In some embodiments, the activated carbon regeneration system further comprises a dust remover disposed between the exhaust gas outlet of the activated carbon regeneration furnace and the low temperature side inlet of the smoke heat exchanger, so that the exhaust gas discharged from the activated carbon regeneration furnace is supplied to the smoke heat exchanger after being dust-removed.
In some embodiments, the dust remover is a bag-type high-temperature dust remover, and the activated carbon regeneration system further comprises a flue gas recycling fan, and the exhaust gas dedusted by the high-temperature dust remover is sent back to the activated carbon regeneration furnace by the flue gas recycling fan.
In some embodiments, the activated carbon regeneration system further comprises an activated carbon feed system for supplying the raw carbon to the activated carbon regeneration furnace.
In some embodiments, the raw carbon is raw carbon pulp or bagged raw carbon.
In some embodiments, the combustion system comprises a first burner and a second burner that supply high temperature flue gas to the activated carbon regeneration furnace and the secondary combustion chamber, respectively.
In some embodiments, the combustion air preheating system includes a first air preheater for supplying first combustion air to the second combustion chamber and a second air preheater for supplying second combustion air to the combustion system.
In some embodiments, the activated carbon regeneration system further comprises a first combustion fan for delivering air to the first air preheater and/or a second combustion fan for delivering air to the second air preheater.
In some embodiments, a combustion air distribution duct is provided between the first air preheater and the second combustion chamber.
In some embodiments, the activated carbon regeneration system further comprises a regenerated carbon cooler in communication with a regenerated carbon outlet of the activated carbon regeneration furnace to receive and cool the regenerated carbon.
In some embodiments, the raw carbon is activated carbon after being used in a wastewater treatment line for adsorption treatment of wastewater.
In some embodiments, the wastewater treatment line comprises an anaerobic process capable of producing biogas which is supplied as fuel to the combustion system and/or the secondary combustion chamber.
Furthermore, according to the first variant described above, more specifically, the outlet temperature of the second combustion chamber is between 850 ℃ and 1100 ℃.
Further, according to the second modification described above, more specifically, the outlet temperature of the secondary combustion chamber is 1100 ℃ or higher.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present disclosure and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained from the drawings without inventive effort. In the drawings:
fig. 1 schematically shows a block diagram of the composition of an activated carbon regeneration system according to an embodiment of the present invention;
fig. 2 schematically shows a block diagram of the composition of an activated carbon regeneration system according to a first variant of the invention;
fig. 3 schematically shows a block diagram of a further development of an activated carbon regeneration system according to a first variant of the invention;
fig. 4 schematically shows a block diagram of the composition of an activated carbon regeneration system according to a second variant of the invention;
fig. 5 schematically shows a block diagram of a further development of an activated carbon regeneration system according to a second variant of the invention;
figure 6 schematically illustrates a first variant of a smoke heat exchanger for use in an activated carbon regeneration system according to an embodiment of the present invention;
figure 7 schematically illustrates a second variation of a smoke heat exchanger for use in an activated carbon regeneration system according to an embodiment of the present invention;
fig. 8 schematically shows that raw carbon treated in an activated carbon regeneration system according to an embodiment of the present invention comes from a wastewater treatment line, and biogas generated by an anaerobic process in the wastewater treatment line is used as fuel for the activated carbon regeneration system according to an embodiment of the present invention to achieve material and heat balance.
List of reference numerals
Activated carbon regeneration system 1
Combustion system 2
Smoke heat exchanger 3
Combustion air preheating system 5
First air preheater A
Second air preheater B
Activated carbon feed system 6
Combustion air distribution pipe 7
Regenerated carbon cooler 8
First combustion fan (waste gas combustion fan) 9
Second combustion fan (burner combustion fan) 10
High temperature dust remover 11
Flue gas recycling fan 12
Exhaust-heat boiler 13
Tail gas treatment system 14
Shell and tube type smoke heat exchanger 3A
High temperature side inlet 32A
Low temperature side outlet 34A
Low temperature side inlet 35A
High temperature side outlet 36A
Plate type smoke heat exchanger 3B
High temperature side inlet 31B
Low temperature side outlet 32B
Low temperature side inlet 33B
High temperature side outlet 34B
Detailed Description
Hereinafter, an activated carbon regeneration system according to an embodiment of the present disclosure is described in detail with reference to the accompanying drawings. To make the objects, technical solutions and advantages of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure.
Thus, the following detailed description of the embodiments of the present disclosure, presented in conjunction with the figures, is not intended to limit the scope of the claimed disclosure, but is merely representative of selected embodiments of the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The singular forms include the plural unless the context otherwise dictates otherwise. Throughout the specification, the terms "comprises," "comprising," "has," "having," "includes," "including," "having," "including," and the like are used herein to specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
In addition, even though terms including ordinal numbers such as "first", "second", etc., may be used to describe various elements, the elements are not limited by the terms, and the terms are used only to distinguish one element from another. For example, a first component could be termed a second component, and, similarly, a second component could be termed a first component, without departing from the scope of the present disclosure.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, or orientations or positional relationships that are conventionally placed when the disclosed products are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are used merely for convenience of describing and simplifying the present disclosure, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present disclosure.
As shown in fig. 1-5, according to some embodiments, the present invention provides an activated carbon regeneration system at least comprising an activated carbon regeneration furnace 1, a combustion system 2, a smoke heat exchanger 3, a secondary combustion chamber 4 and a combustion air preheating system 5.
In the embodiments, the activated carbon regeneration furnace 1 is provided with at least a high-temperature flue gas inlet, a regenerated carbon outlet and a waste gas outlet. Wherein, the high-temperature flue gas inlet is used for receiving the high-temperature flue gas from the combustion system 2, so as to carry out thermal regeneration treatment on the raw carbon under a high-temperature environment to generate regenerated carbon and waste gas. In a specific embodiment, in the activated carbon regeneration furnace 1, the activated carbon will go through three process stages, namely a drying stage, a desorption carbonization stage and an activation stage: in the drying step, for example, the water content of the activated carbon is evaporated and dried at a temperature of 200 to 400 ℃; in desorption carbonization stageIn the stage, for example, organic substances adsorbed in the pores by the activated carbon are volatilized and carbonized at the temperature of 400-600 ℃; in the activation stage, for example, steam is introduced at a high temperature of 800-1000 ℃ to carbonize the organic matters in the activation stage, and residual carbon in the pore structure of the activated carbon is removed by gasification reaction as follows: c + H2O→CO+H2So that the pore structure and the inner surface of the active carbon are cleaned and the adsorption and decoloration performance is restored to the degree close to that of the new carbon. The temperature of the flue gas at the outlet of the regenerating furnace is, for example, 300-400 ℃. Therefore, in order to make the most of the high temperature flue gas from the combustion system 2, it is possible to arrange in the activated carbon regeneration furnace 1 that the flow direction of the high temperature flue gas is opposite to the flow direction of the raw carbon, so that the temperature distribution in the activated carbon regeneration furnace 1 coincides with the above-described stage where the raw carbon is treated, making use of the high temperature flue gas and producing regenerated carbon in a more efficient manner.
The regenerated carbon outlet of the activated carbon regenerator 1 is for discharging regenerated carbon, and as shown for example in fig. 3 and 5, the regenerated carbon outlet is optionally for discharging regenerated carbon into a regenerated carbon cooler 8 for cooling high temperature regenerated carbon exiting the activated carbon regenerator, which may be stored or transported or otherwise disposed of. The exhaust gas outlet is used to discharge the exhaust gas, and as mentioned above, the exhaust gas may comprise at least CO and H2And the temperature is, for example, 300 to 400 ℃.
According to a more specific embodiment, as shown in fig. 3 and 5, the activated carbon regeneration furnace 1 may further comprise a raw carbon inlet for communicating with the activated carbon feed system 6, wherein raw carbon, for example in the form of raw carbon pulp or bagged raw carbon, enters the activated carbon regeneration furnace from the activated carbon feed system to perform the activated carbon regeneration process described above therein.
As shown in fig. 1 to 5, in these embodiments, the combustion system 2 is provided with at least a first combustion air inlet for receiving preheated combustion air from the combustion air preheating system and a high temperature flue gas outlet for discharging high temperature flue gas, which is connected to the high temperature flue gas inlet of the activated carbon regeneration furnace 1 to supply the high temperature flue gas from the combustion system 2 to the activated carbon regeneration furnace 1 to ensure the activated carbon regeneration process in the activated carbon regeneration furnace 1. In a more specific embodiment, the combustion system may optionally comprise a first burner and a second burner supplying high temperature flue gas to the activated carbon regeneration furnace and the secondary combustion chamber, respectively, so that high temperature flue gas with possibly different composition and/or temperature may be provided to the activated carbon regeneration furnace and the secondary combustion chamber, respectively, in a targeted manner according to the specific and possibly different requirements of the activated carbon regeneration furnace and the secondary combustion chamber for high temperature flue gas, to further ensure efficient energy utilization and more efficient activated carbon regeneration, which is more cost-effective. It should be noted that the auxiliary fuel used in the combustion system may be conventional fuel such as natural gas, diesel oil, etc., or may be unconventional fuel such as biogas, syngas, etc.
As shown in fig. 1-5, in the embodiments, the smoke heat exchanger 3 is provided with a low temperature side inlet for communicating with the exhaust gas outlet of the activated carbon regeneration furnace 1 to receive the exhaust gas and a high temperature side inlet for receiving the high temperature heat exchange smoke from the secondary combustion chamber 4, so that the waste gas and the high-temperature heat exchange flue gas can exchange heat in the flue gas-flue gas heat exchanger 3 to correspondingly generate high-temperature waste gas and low-temperature heat exchange flue gas, and the smoke heat exchanger 3 is also provided with a high-temperature side outlet for discharging high-temperature waste gas and a low-temperature side outlet for discharging low-temperature heat exchange smoke, for example, high temperature flue gases may be supplied to the secondary combustion chamber 4 to facilitate efficient and rapid combustion of the flue gases therein, and for example low temperature heat exchange flue gases as they are still at a very high temperature and thus carry a lot of thermal energy, available to be supplied to the combustion air preheating system 5 to take part in the preheating of the combustion air therein.
As for the specific form of the smoke heat exchanger 3, a shell-and-tube type smoke heat exchanger 3A as shown in fig. 6 or a plate type smoke heat exchanger 3B as shown in fig. 7 can be adopted, and the smoke heat exchangers 3A and 3B are both made of high-temperature-resistant and corrosion-resistant materials, so that the structure is simple; and the shell design has good heat preservation measures and less heat loss.
The shell-and-tube smoke heat exchanger 3A shown in fig. 6 may include: a casing 30A, for example, of a generally cylindrical shape, in which at least one longitudinally extending heat exchange tube (not shown) for the passage of high-temperature flue gas and an exhaust gas flow path (not shown) isolated from the heat exchange tube for the passage of exhaust gas from the activated carbon regeneration furnace 1 are provided; an inlet smoke box 31A provided near a first longitudinal end of the housing 30A and having a high temperature side inlet 32A for high temperature flue gas to enter provided thereon; an outlet smoke box 33A provided in the vicinity of a second longitudinal end of the housing 30A opposite to the first longitudinal end and provided thereon with a low-temperature side outlet 34A for low-temperature flue gas to be discharged; a low temperature side inlet 35A for taking in exhaust gas, provided on the case 30A near the low temperature side outlet 34A; a high temperature side outlet 36A for discharging high temperature exhaust gas is provided on the casing 30A near the high temperature side inlet 32A. That is, in this shell-and-tube type smoke heat exchanger 3A, the flow direction of the high-temperature flue gas is opposite to the flow direction of the exhaust gas, so that sufficient heat exchange is performed between the two. Furthermore, as shown, at least one baffle 37A forming an exhaust gas flow path is also provided on the inner face of the housing wall to more effectively exchange heat between the high temperature flue gas and the exhaust gas. Of course, the shell-and-tube type smoke heat exchanger 3A may further include various valves (not shown) for controlling and regulating the flow rate of exhaust gas and/or the flow rate of high-temperature smoke.
The plate-type smoke heat exchanger 3B as shown in fig. 7 may comprise: a housing 30B; a high-temperature side inlet 31B for high-temperature flue gas to enter, a high-temperature side outlet 34B for high-temperature flue gas to exhaust, a low-temperature side inlet 33B for waste gas to enter and a low-temperature side outlet 32B for waste gas to exhaust, which are arranged on the shell 30B; the heat exchange plate tubes are arranged in the shell 30B, wherein high-temperature flue gas enters the heat exchange plate tubes through the high-temperature side inlet 31B, low-temperature waste gas circulates between the heat exchange plate tubes and the shell 30B, and the low-temperature waste gas exchanges heat with the high-temperature flue gas in the heat exchange plate tubes in a countercurrent mode. In addition, fins and the like can be arranged between heat exchange plate tubes in the plate type smoke heat exchanger to ensure more effective heat exchange.
As shown in fig. 1-5, in these embodiments, the second combustion chamber 4 is at least provided with a high-temperature exhaust gas inlet, a second combustion air inlet and a high-temperature heat exchange flue gas outlet. Wherein the high temperature exhaust gas inlet communicates with the high temperature side outlet of the flue gas heat exchanger to receive high temperature exhaust gas from the flue gas heat exchanger after heat exchange with the high temperature flue gas, as indicated above, such high temperature exhaust gas will contribute to its sufficient and efficient combustion in the secondary combustion chamber 4 and save the need for additional heat by the secondary combustion chamber 4 because it is at a high temperature when entering the secondary combustion chamber 4. The second combustion air inlet is used for receiving preheated combustion air from the combustion air preheating system to further promote the combustion of high-temperature waste gas in the second combustion chamber 4. The combustion of the high temperature exhaust gas in the secondary combustion chamber 4 will produce high temperature flue gas in the secondary combustion chamber 4, while its high temperature heat exchange flue gas outlet is used for communicating with the high temperature side inlet of the flue gas heat exchanger to supply high temperature heat exchange flue gas to the flue gas heat exchanger 3 for heat exchange with the exhaust gas from the activated carbon regeneration furnace 1, as indicated above.
As shown in fig. 1-5, in such embodiments, the combustion air preheating system 5 may be provided with at least a low temperature heat exchange gas inlet and a combustion air outlet. The low temperature heat exchange gas inlet is in communication with the low temperature side outlet of the smoke heat exchanger 3 and receives the above low temperature heat exchange flue gas which is still at a higher temperature and carries a large amount of heat energy to facilitate preheating of the combustion air, which allows to reduce the extra energy requirement for preheating the combustion air. The combustion air outlet is communicated with the first combustion air inlet of the combustion system 2 and the second combustion air inlet of the second combustion chamber 4 to supply preheated combustion air to the combustion system 2 and the second combustion chamber 4 respectively.
From this, according to the utility model discloses an active regeneration system is through setting up the cigarette heat exchanger, the high temperature heat transfer flue gas that burning waste gas produced in can the recycle second combustion chamber, and can make low temperature waste gas and high temperature heat transfer flue gas carry out the heat transfer at this cigarette heat exchanger, carry second combustion chamber after with waste gas heating on the one hand, help abundant and effective burning of waste gas, and reduce the energy consumption of second combustion chamber, and on the other hand will carry from cigarette heat exchanger exhaust low temperature heat transfer flue gas and preheat in the combustion air preheating system in order to preheat combustion air, thereby still save combustion air preheating system's energy consumption. From this, according to the utility model discloses an active carbon regeneration system carries out cyclic utilization through the inside high temperature flue gas that produces in the regeneration process of active carbon regeneration system, is showing the energy consumption that reduces hot active carbon regeneration in-process to reduce exhaust emissions, promote active carbon regeneration efficiency.
It should be noted that, in a more specific release event, the combustion air preheating system 1 may comprise a first air preheater a for supplying first combustion air to said second combustion chamber 4 and a second air preheater B for supplying second combustion air to the combustion system 2, as shown in fig. 3 and 5. Different combustion air which is more suitable for and can more effectively support combustion can be supplied to the combustion system 2 and the secondary combustion chamber 4 according to respective requirements of the combustion system 2 and the secondary combustion chamber 4, so that the energy utilization rate is improved, the energy is saved, and the secondary combustion chamber is more cost-effective and more environment-friendly. More specifically, and accordingly, the activated carbon regeneration system may further include a first combustion fan (waste gas combustion fan) 9 for supplying air to the first air preheater and/or a second combustion fan (burner combustion fan) 10 for supplying air to the second air preheater, as shown in fig. 3 and 5, which is also advantageous in that different combustion air is supplied according to different requirements, the efficiency is improved, and the energy utilization efficiency is ensured. Furthermore, optionally, as shown in fig. 3 and 5, in order to distribute the preheated combustion air to the second combustion chamber 4 in a more efficient or uniform manner, a combustion air distribution pipe 7 may also be provided between the first air preheater a and the second combustion chamber 4, which facilitates efficient and thorough combustion in the second combustion chamber 4.
In a more specific embodiment, as shown in fig. 3 and 5, the activated carbon regeneration system may further include a dust remover disposed between the exhaust gas outlet of the activated carbon regeneration furnace 1 and the low-temperature side inlet of the smoke heat exchanger 3, so that the exhaust gas discharged from the activated carbon regeneration furnace 1 is supplied to the smoke heat exchanger 3 after being subjected to dust removal, thereby avoiding introducing suspended matters such as dust carried in the exhaust gas into the smoke heat exchanger 3 to affect the performance of the smoke heat exchanger 3 and even make it unable to work normally. More specifically, as shown in fig. 3 and 5, the dust collector is, for example, a bag-type high-temperature dust collector 11, and the activated carbon regeneration system may further include a flue gas recycling fan 12, so that the exhaust gas dedusted by the high-temperature dust collector 11 is sent back to the activated carbon regeneration furnace 1 via the flue gas recycling fan 12. Thereby, the exhaust gas having passed through the high temperature dust collector 11 and thus having an increased temperature can be reintroduced into the activated carbon regeneration furnace 1 to provide the activated carbon regeneration furnace 1 with recovered heat energy, thereby saving energy consumption of the activated carbon regeneration furnace.
Furthermore, as shown in fig. 2 to 4, the activated carbon regeneration system may further include a waste heat boiler 13, and the arrangement of the waste heat boiler 13 may be implemented according to the first modification shown in fig. 2 to 3, or according to the second modification shown in fig. 4 to 5.
As shown in fig. 2-3, in a first variant, a waste heat boiler 13 is connected to at least a part of the combustion air preheating system 5 to receive from the combustion air preheating system 5 flue gas waste heat, which can be used to facilitate steam generation in the waste heat boiler, and which can supply steam to the activated carbon regeneration furnace for use in the activated carbon regeneration process. In fig. 3, more specifically, the waste heat boiler 13 is connected to and receives flue gas waste heat from a second air preheater (air preheater B). Furthermore, in this first variant, the exhaust gas treatment system 14, which is normally included in the activated carbon regeneration system, is connected to the waste heat boiler 13 to receive the exhaust gases from the waste heat boiler 13 and to treat them. Preferably, the outlet temperature of the second combustion chamber in this first variant is between about 850 ℃ and about 1100 ℃, and this first variant is for example suitable for the case where raw charcoal is non-hazardous waste.
As shown in fig. 4 to 5, in the second modification, in order to secure the use condition, the applicable temperature, and the operability of the smoke heat exchanger 3, the waste heat boiler 13 is provided between the secondary combustion chamber 4 and the smoke heat exchanger 3, and more specifically, the high-temperature heat exchange flue gas outlet of the secondary combustion chamber 4 communicates with the high-temperature side inlet of the smoke heat exchanger 3 via this waste heat boiler 13, so that the high-temperature heat exchange flue gas from the secondary combustion chamber 4 promotes the steam generation in the waste heat boiler 13, and the waste heat boiler 13 supplies the steam to the activated carbon regeneration furnace 1 for the activated carbon regeneration process performed therein. And in this second variation, the tail gas treatment system 14 may be provided in connection with the combustion air preheating system to receive tail gas from the combustion air preheating system and treat the tail gas. In FIG. 5, more specifically, the tail gas treatment system 14 is coupled to and receives tail gas from a second air preheater (air preheater B). Preferably, the outlet temperature of secondary combustion chamber 4 in this second variant is above about 1100 ℃, and this second variant is for example suitable for the case where raw charcoal is hazardous waste, to ensure that the harmful exhaust gases can be sufficiently combusted in secondary combustion chamber 4 to be converted into harmless gases, ensuring environmental friendliness.
Therefore, according to the utility model discloses an active carbon regeneration system can realize following effect in energy recuperation and cyclic utilization at least layer upon layer progressively:
the first stage is as follows: the waste gas from the activated carbon regeneration furnace enters a bag-type high-temperature dust remover for removing dust in the flue gas, a part of the waste gas (300-400 ℃) after dust removal is recycled to the activated carbon regeneration furnace, and the recycled waste gas contains high-concentration CO and H2And the organic gas desorbed and decomposed is mixed and combusted in a hearth of the regeneration furnace, so that part of heat is provided for an active carbon regeneration system. In a specific embodiment, the amount of the recycled waste gas is about half of the amount of the waste gas at the outlet of the activated carbon regeneration furnace; this is of course merely illustrative and not restrictive, and the ratio may be adjusted according to actual operating conditions;
and a second stage: the other part of the dedusted waste gas enters a smoke heat exchanger to exchange heat with high-temperature heat exchange smoke from a secondary combustion chamber, so that the waste gas becomes high-temperature waste gas after heat exchange and enters the secondary combustion chamber to be incinerated, and the residual combustible gas is removed; the temperature of the high-temperature waste gas after heat exchange can reach 650-700 ℃, and preheated combustion-supporting air is introduced into the secondary combustion chamber and is used for combustion of the high-temperature waste gas, so that the use amount of fuel of a combustion system used for the secondary combustion chamber is greatly saved;
the low-temperature heat exchange flue gas after heat exchange enters a subsequent combustion-supporting air preheating system which can comprise a multistage air preheater and exchanges heat with combustion-supporting air again, and the combustion-supporting air after heat exchange is used for combustion supporting of a combustion system and combustion supporting of waste gas of a secondary combustion chamber. It is worth noting that the preheating of the combustion-supporting air is not limited to the heat exchange between the combustion-supporting air and the low-temperature heat exchange flue gas, and the combustion-supporting air can also be heated by using the steam generated by the waste heat boiler (steam generator), but in this case, the gas production of the waste heat boiler should be increased, and the preheating temperature of the combustion-supporting air is lower;
and a third stage: saturated steam is generated by utilizing high-temperature flue gas and can be used for regenerating activated carbon.
In the process that the temperature of the outlet of the second combustion chamber is 850-1100 ℃, the method comprises the following steps:
a waste heat boiler is arranged behind a combustion air preheating system which can comprise a multi-stage air preheater to recover waste heat again, and steam is generated for regeneration of the activated carbon. The tail gas after heat recovery can be discharged to a subsequent tail gas treatment system through a draught fan for treatment;
in the process that the outlet temperature of the second combustion chamber is more than 1100 ℃, the method comprises the following steps:
in order to ensure the use condition and the effect of the smoke heat exchanger, a waste heat boiler is arranged at the outlet of the secondary combustion chamber, waste heat utilization is firstly carried out on high-temperature heat exchange smoke, and generated steam is used for activated carbon regeneration.
From this, according to the utility model discloses an active carbon regeneration system can carry out multistage recovery and cyclic utilization through the inside high temperature flue gas that produces in the regeneration process of active carbon regeneration system, the regenerative combustion system's that significantly reduces fuel usage to greatly limit reduces the energy consumption among the hot active carbon regeneration process, reduces the charcoal loss, reduces exhaust emissions, promotes active carbon regeneration efficiency, has cost benefit and environment-friendly nature.
In a more specific embodiment, the raw carbon to be subjected to the regeneration treatment is activated carbon after being used for the adsorption treatment of wastewater in a wastewater treatment line. And more particularly, the wastewater treatment line may include an anaerobic process capable of generating biogas, in which case biogas may be supplied as a fuel to the combustion system and/or secondary combustion chamber to achieve a material and energy balance throughout the wastewater treatment line and activated carbon regeneration process, wherein the lower calorific value of the biogas as a fuel is 5700 kcal/kg. As demonstrated by the following project tests.
Table 1: waste activated carbon (COD: chemical oxygen demand) produced in a wastewater treatment line in the test of the item
Table 2: quality of raw charcoal entering an activated charcoal regenerating furnace (d 10: representing that 90% of the effective particle size of raw charcoal satisfies 0.95mm)
The auxiliary fuel was biogas generated by anaerobic process in the wastewater treatment line in the test of this item, and energy and material were balanced, as shown in fig. 8.
The energy consumption comparison result of the activated carbon regeneration system according to the present invention and the conventional process is shown in table 3.
Table 3: according to the utility model discloses an energy consumption comparison of active carbon regeneration system and traditional technology
As can be seen from Table 3, the energy consumption of the activated carbon regeneration system of the present invention is only 31.6% of the energy consumption of the conventional process. Therefore, verified the basis the utility model discloses an active carbon regeneration system significantly reduces regenerative combustion system's fuel use amount, and very limit ground reduces the energy consumption among the hot active carbon regeneration process, has cost-benefit and environment-friendly nature.
The exemplary embodiment of the activated carbon regeneration system proposed by the present invention has been described in detail with reference to the preferred embodiments, however, it will be understood by those skilled in the art that various modifications and changes can be made to the above specific embodiments without departing from the concept of the present invention, and various combinations of the various technical features and structures proposed by the present invention can be made without departing from the scope of the present invention.
The scope of the present disclosure is not defined by the above-described embodiments but is defined by the appended claims and equivalents thereof.
Claims (18)
1. The utility model provides an active carbon regeneration system, its characterized in that active carbon regeneration system includes active carbon regeneration stove, combustion system, cigarette heat exchanger, second combustion chamber and combustion air system of preheating at least, wherein:
the activated carbon regeneration furnace is at least provided with a high-temperature flue gas inlet, a regenerated carbon outlet and a waste gas outlet, wherein the high-temperature flue gas inlet is used for receiving high-temperature flue gas so as to perform thermal regeneration treatment on raw carbon to generate regenerated carbon and waste gas, the regenerated carbon outlet is used for discharging the regenerated carbon, and the waste gas outlet is used for discharging the waste gas;
the combustion system is at least provided with a first combustion air inlet for receiving combustion air and is configured to be connected with a high-temperature flue gas inlet of the activated carbon regeneration furnace so as to supply the high-temperature flue gas to the activated carbon regeneration furnace;
the smoke heat exchanger is provided with a low-temperature side inlet which is communicated with a waste gas outlet of the activated carbon regeneration furnace to receive the waste gas and a high-temperature side inlet which is used for receiving high-temperature heat exchange smoke, the waste gas and the high-temperature heat exchange smoke exchange in the smoke heat exchanger to correspondingly generate high-temperature waste gas and low-temperature heat exchange smoke, and the smoke heat exchanger is also provided with a high-temperature side outlet which is used for discharging the high-temperature waste gas and a low-temperature side outlet which is used for discharging the low-temperature heat exchange smoke;
the secondary combustion chamber is at least provided with a high-temperature waste gas inlet, a second combustion air inlet and a high-temperature heat exchange smoke outlet, wherein the high-temperature waste gas inlet is communicated with a high-temperature side outlet of the smoke and smoke heat exchanger to receive the high-temperature waste gas, the second combustion air inlet is used for receiving combustion air to promote the combustion of the high-temperature waste gas in the secondary combustion chamber, and the high-temperature heat exchange smoke outlet is communicated with a high-temperature side inlet of the smoke and smoke heat exchanger to supply the high-temperature heat exchange smoke to the smoke and smoke heat exchanger;
the combustion-supporting air preheating system is at least provided with a low-temperature heat exchange gas inlet and a combustion-supporting air outlet, the low-temperature heat exchange gas inlet is communicated with a low-temperature side outlet of the smoke-fume heat exchanger and receives the low-temperature heat exchange smoke to promote preheating of combustion-supporting air, and the combustion-supporting air outlet is communicated with the first combustion-supporting air inlet and the second combustion-supporting air inlet to supply preheated combustion-supporting air to the combustion system and the secondary combustion chamber respectively.
2. The activated carbon regeneration system of claim 1, further comprising a waste heat boiler coupled to at least a portion of the combustion air preheating system to receive flue gas waste heat from the combustion air preheating system, the flue gas waste heat facilitating steam generation in the waste heat boiler, and the waste heat boiler supplying the steam to the activated carbon regeneration furnace.
3. The system of claim 2, further comprising a tail gas treatment system coupled to the waste heat boiler to receive tail gas from the waste heat boiler and treat the tail gas.
4. The activated carbon regeneration system according to claim 1, further comprising a waste heat boiler, and the high temperature heat exchange flue gas outlet of the secondary combustion chamber communicates with the high temperature side inlet of the smoke heat exchanger via the waste heat boiler, so that the high temperature heat exchange flue gas from the secondary combustion chamber promotes steam generation in the waste heat boiler, and the waste heat boiler supplies the steam to the activated carbon regeneration furnace.
5. The activated carbon regeneration system of claim 4, further comprising a tail gas treatment system coupled to the combustion air preheating system to receive tail gas therefrom and treat the tail gas.
6. The activated carbon regeneration system according to any one of claims 1 to 5, further comprising a dust remover provided between an exhaust gas outlet of the activated carbon regeneration furnace and a low temperature side inlet of the smoke heat exchanger, so that exhaust gas discharged from the activated carbon regeneration furnace is supplied to the smoke heat exchanger after being dust-removed.
7. The activated carbon regeneration system according to claim 6, wherein the dust collector is a bag-type high-temperature dust collector, and the activated carbon regeneration system further comprises a flue gas recycling fan, and the exhaust gas dedusted by the high-temperature dust collector is sent back to the activated carbon regeneration furnace via the flue gas recycling fan.
8. The activated carbon regeneration system of any one of claims 1 to 5, further comprising an activated carbon feed system for supplying the raw carbon to the activated carbon regeneration furnace.
9. The activated carbon regeneration system of claim 8, wherein the raw carbon is raw carbon pulp or bagged raw carbon.
10. The activated carbon regeneration system according to any one of claims 1 to 5, wherein the combustion system includes a first combustor and a second combustor that supply high-temperature flue gas to the activated carbon regeneration furnace and the secondary combustion chamber, respectively.
11. The activated carbon regeneration system of any one of claims 1 to 5, wherein the combustion air preheating system comprises a first air preheater for supplying first combustion air to the secondary combustion chamber and a second air preheater for supplying second combustion air to the combustion system.
12. The activated carbon regeneration system of claim 11, further comprising a first combustion fan for delivering air to the first air preheater and/or a second combustion fan for delivering air to the second air preheater.
13. The activated carbon regeneration system of claim 12, wherein a combustion air distribution duct is disposed between the first air preheater and the secondary combustion chamber.
14. The activated carbon regeneration system of any one of claims 1 to 5, further comprising a regenerated carbon cooler in communication with a regenerated carbon outlet of the activated carbon regeneration furnace to receive and cool the regenerated carbon.
15. The activated carbon regeneration system according to any one of claims 1 to 5, wherein the raw carbon is activated carbon after being used for adsorption treatment of wastewater in a wastewater treatment line.
16. The activated carbon regeneration system of claim 15, wherein the wastewater treatment line comprises an anaerobic process capable of producing biogas, which is supplied as fuel to the combustion system and/or the secondary combustion chamber.
17. The activated carbon regeneration system of claim 2 or 3, wherein the outlet temperature of the secondary combustion chamber is 850 ℃ to 1100 ℃.
18. The activated carbon regeneration system of claim 4 or 5, wherein the outlet temperature of the secondary combustion chamber is 1100 ℃ or higher.
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Address after: 116318 original Xingang primary school, Xingang village, Changxingdao Economic Zone, Dalian City, Liaoning Province Patentee after: HENGLI PETROCHEMICAL (DALIAN) Co.,Ltd. Patentee after: Suez Environmental Technology (Beijing) Co.,Ltd. Address before: 116318 original Xingang primary school, Xingang village, Changxingdao Economic Zone, Dalian City, Liaoning Province Patentee before: HENGLI PETROCHEMICAL (DALIAN) Co.,Ltd. Patentee before: Suez Water Treatment Co,.Ltd. |