WO2018232722A1 - Système d'oxydation thermique régénératif et procédé de fonctionnement de système d'oxydation thermique régénératif - Google Patents

Système d'oxydation thermique régénératif et procédé de fonctionnement de système d'oxydation thermique régénératif Download PDF

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Publication number
WO2018232722A1
WO2018232722A1 PCT/CN2017/089712 CN2017089712W WO2018232722A1 WO 2018232722 A1 WO2018232722 A1 WO 2018232722A1 CN 2017089712 W CN2017089712 W CN 2017089712W WO 2018232722 A1 WO2018232722 A1 WO 2018232722A1
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WO
WIPO (PCT)
Prior art keywords
chamber
pipe
regenerator
gas stream
oxidation
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Application number
PCT/CN2017/089712
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English (en)
Inventor
Liang YU
Lishun Hu
Junli Xue
Friedhelm Hillen
Original Assignee
General Electric Company
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Filing date
Publication date
Application filed by General Electric Company filed Critical General Electric Company
Priority to CN201780092423.2A priority Critical patent/CN110998186A/zh
Priority to PCT/CN2017/089712 priority patent/WO2018232722A1/fr
Publication of WO2018232722A1 publication Critical patent/WO2018232722A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
    • F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
    • F23G7/066—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel preheating the waste gas by the heat of the combustion, e.g. recuperation type incinerator
    • F23G7/068—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel preheating the waste gas by the heat of the combustion, e.g. recuperation type incinerator using regenerative heat recovery means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2209/00—Specific waste
    • F23G2209/14—Gaseous waste or fumes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2900/00—Special features of, or arrangements for incinerators
    • F23G2900/55—Controlling; Monitoring or measuring
    • F23G2900/55006—Measuring material flow rates

Definitions

  • the present disclosure generally relates to a regenerative thermal oxidizer (RTO) system and a method for operating an RTO system.
  • RTO regenerative thermal oxidizer
  • Industrial emissions often contain combustible pollutants, contaminants and/or odors, such as volatile organic compounds (VOCs) , that, if released to the atmosphere, have a potential for polluting the environment.
  • VOCs volatile organic compounds
  • Thermal and/or catalytic oxidizers increase the temperature of such industrial emissions to a temperature above the ignition temperature of the pollutants so as to oxidize the pollutants.
  • RTOs have been used to remove contaminants from an industrial gas stream. RTOs are unique in their ability to conserve fuel through using heat exchange medium.
  • an RTO comprises a combustion chamber, at least two regenerator chambers containing heat exchange medium, a conduit system for conveying an industrial gas stream to and from the combustion chamber via the regenerator chambers, and a control system.
  • the heat exchange medium usually comprises a ceramic material.
  • a first regenerator chamber and a second regenerator chamber are heated to a predetermined temperature. Then an industrial gas stream to be cleaned passes through the first regenerator chamber into the combustion chamber.
  • the gas begins to approach combustion temperature or combustion has already started autothermally.
  • the gas may be further heated via burners so that thermal oxidation takes place or combustion continues if autothermicity has started.
  • a hot clean gas leaving the combustion chamber is then passed through the second regenerator chamber, where the gas releases the majority of its heat, and thus causes the temperature of the second regenerator chamber to rise.
  • the cooled gas stream is then discharged from the two-chamber RTO.
  • the flow of the industrial gas stream to be cleaned is reversed by a control system such that the second regenerator chamber receives the industrial gas stream to be cleaned, where the industrial gas stream to be cleaned is pre-heated before introduced into the combustion chamber.
  • the pre-heating improves the efficiency of the system.
  • the first regenerator chamber receives the hot clean gas from the combustion chamber. The above process is repeated as the two-chamber RTO continuously and efficiently removes impurities from the industrial gas stream.
  • a three-chamber RTO can avoid the periodical peaks by purging the off-line chamber before queuing it up for the next exhaust cycle to achieve a higher destruction efficiency than the two-chamber RTO.
  • the three-chamber RTO is more expensive and requires more space.
  • the RTO system comprises a feed pipe for supplying a feed gas stream; a discharge pipe for discharging a first output gas stream; a combustion chamber; a first regenerator chamber and a second regenerator chamber in fluid communication with the combustion chamber; an oxidation chamber having an inlet and an outlet; a flow control system configured to: control switchover of a connection between the feed pipe and the first regenerator chamber and a connection between the feed pipe and the second regenerator chamber; control switchover of a connection between the first regenerator chamber and the discharge pipe and a connection between the second regenerator chamber and the discharge pipe; and control switchover of a connection between the first regenerator chamber and the inlet of the oxidation chamber, and a connection between the second regenerator chamber and the inlet of the oxidation chamber.
  • the RTO system comprises a feed pipe for supplying a feed gas stream, a discharge pipe for discharging a first output gas stream, a combustion chamber, a first regenerator chamber and a second regenerator chamber in fluid communication with the combustion chamber, and an oxidation chamber having an inlet and an outlet.
  • the method comprises: controlling the feed gas stream from the feed pipe flowing through the first regenerator chamber, the combustion chamber, the second regenerator chamber and the discharge pipe; controlling a residual feed gas stream in the first regenerator chamber flowing through the oxidation chamber; controlling the feed gas stream from the feed pipe flowing through the second regenerator chamber, the combustion chamber, the first regenerator chamber and the discharge pipe; and controlling a residual feed gas stream in the second regenerator chamber flowing through the oxidation chamber.
  • Fig. 1 is a schematic diagram of an RTO system in accordance with a first embodiment of the present disclosure
  • Fig. 2 is a schematic diagram of an RTO system in accordance with a second embodiment of the present disclosure.
  • Fig. 3 is a flow diagram of a method for operating an RTO system in accordance with one embodiment of the present disclosure.
  • the approximating language may correspond to the precision of an instrument for measuring the value.
  • range limitations may be combined and/or interchanged, such ranges are identified and include all the sub-ranges contained therein unless context or language indicates otherwise.
  • suffix “ (s) ” as used herein is usually intended to include both the singular and the plural of the term that it modifies, thereby including one or more of that term.
  • any numerical values recited herein include all values from the lower value to the upper value in increments of one unit provided that there is a separation of at least 2 units between any lower value and any higher value.
  • the amount of a component or a value of a process variable such as, for example, temperature, pressure, time and the like is, for example, from 1 to 90, it is intended that values such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 etc. are expressly enumerated in this specification.
  • one unit is considered to be 0.0001, 0.001, 0.01 or 0.1 as appropriate.
  • Fig. 1 shows an RTO system 100 in accordance with a first embodiment of the present disclosure.
  • the RTO system 100 comprises a feed pipe 102 for supplying a feed gas stream from a source of feed gas stream 101, a discharge pipe 103 for discharging a first output gas stream, a combustion chamber 115, a first regenerator chamber 111, a second regenerator chamber 113, an oxidation chamber 117 and three flow control units.
  • the source of feed gas stream 101 may originate from an industry which could produce waste gases including gas engine operation, petroleum refineries, fuel combustions, chemical processing, decomposition in the biosphere and biomass, pharmaceutical plants, automobile industries, textile manufacturers, cleaning products, printing process, painting/coating process, electronic/semiconductors industries, etc.
  • the combustion chamber 115 is positioned between and in fluid communication with the first regenerator chamber 111 and the second regenerator chamber 113.
  • the combustion chamber 115 is provided with one or more burners (not shown in Fig. 1) to maintain a high temperature in the combustion chamber 115.
  • the oxidation chamber 117 comprises an inlet 128 and an outlet 129.
  • Each of the first regenerator chamber 111, the second regenerator chamber 113 and the oxidation chamber 117 is provided with a heat exchange media 120.
  • the heat exchange media 120 comprises a ceramic material.
  • the heat exchange media 120 in at least one of the first regenerator chamber 111, the second regenerator chamber 113, and the oxidation chamber 117 may comprise one or more VOC oxidation catalysts. So the oxidation of pollutants may take place within the heat exchange media 120 at a reduced temperature. The lower oxidation temperatures result in reduction of fuel consumption and low operation cost.
  • the VOC oxidation catalyst can be used may comprise precious metal catalysts, such as Pt, Pd, Pt-Pd, or metal oxides, such as Cu-Mn oxides, Mn-Mg oxides, Cu-Mg-Cr oxides, and Cu-Cr oxides.
  • the first regenerator chamber 111 and the second regenerator chamber 113 usually have a same size.
  • the oxidation chamber 117 has a smaller size than either the first regenerator chamber 111 or the second regenerator chamber 113.
  • the size of the oxidation chamber 117 is 1%-20%of the size of the first regenerator chamber 111. More preferably, the size of the oxidation chamber 117 is 1%-10%of the size of the first regenerator chamber 111. Because of the small size of the oxidation chamber 117, the RTO system 100 has smaller footprint than a conventional three-chamber RTO system. Furthermore, the cost of the RTO system 100 is lower than a conventional three-chamber RTO system.
  • the three flow control units of the RTO system 100 comprise a plurality of pipes and valves.
  • a first flow control unit comprises a first inlet pipe 131 and a second inlet pipe 132 for connecting the feed pipe 102 to the first regenerator chamber 111 and the second regenerator chamber 113 respectively.
  • a second flow control unit comprises a first outlet pipe 133 and a second outlet pipe 134 for connecting the first regenerator chamber 111 and the second regenerator chamber 113 to the discharge pipe 103 respectively.
  • a third flow control unit comprises a first intermediate pipe 135 and a second intermediate pipe 136 for connecting the first regenerator chamber 111 and the second regenerator chamber 113 to the inlet 128 of the oxidation chamber 117 respectively.
  • Six valves 141 ⁇ 146 are positioned on the first inlet pipe 131, the second inlet pipe 132, the first outlet pipe 133, the second outlet pipe 134, the first intermediate pipe 135 and the second intermediate pipe 136 respectively, to control opening and closing of the corresponding pipes.
  • the first step is to heat the heat exchange medium 120 in the first regenerator chamber 111, the second regenerator chamber 113, and the oxidation chamber 117 to a predetermined temperature. Then an operation cycle may be repeated during operation of the RTO system 100.
  • the operation cycle comprises the steps of:
  • valves 141 and 144 close other valves, to allow the feed gas stream supplied by the feed pipe 102 to flow through the first inlet pipe 131, the first regenerator chamber 111, the combustion chamber 115, the second regenerator chamber 113, the second outlet pipe 134, and the discharge pipe 103;
  • valves 142 and 145 open the valves 142 and 145, close other valves, to allow a residual feed gas stream in the first regenerator chamber 111 to flow through the oxidation chamber 117, where the residual feed gas stream in the first regenerator chamber 111 is oxidized;
  • valves 142 and 143 open the valves 142 and 143, close other valves, to allow the feed gas stream supplied by the feed pipe 102 to flow through the second inlet pipe 132, the second regenerator chamber 113, the combustion chamber 115, the first regenerator chamber 111, the first outlet pipe 133, and the discharge pipe 103;
  • valves 141 and 146 open the valves 141 and 146, close other valves, to allow a residual feed gas stream in the second regenerator chamber 113 to flow through the oxidation chamber 117, where the residual feed gas stream in the second regenerator chamber 113 is oxidized.
  • the RTO system 100 may further comprise a first heat supply pipe 139 connecting the combustion chamber 115 to the oxidation chamber 117.
  • the first heat supply pipe 139 comprises a valve 149 to control opening and closing of the first heat supply pipe 139.
  • the oxidation chamber 117 may discharge a second output gas stream of high temperature from its outlet 129.
  • a second heat supply pipe 137 may be introduced into the source of feed gas stream 101 through a second heat supply pipe 137. Therefore, the feed gas stream may be pre-heated before sent to the first regenerator chamber 111 or the second regenerator chamber113.
  • the second output gas stream may be introduced to the discharge pipe 103 for discharge directly.
  • Fig. 2 shows an RTO system 200 in accordance with a second embodiment of the present disclosure.
  • the RTO system 200 comprises a feed pipe 202 for supplying a feed gas stream from a source of feed gas stream 201, a discharge pipe 203 for discharging a first output gas stream, a combustion chamber 215, a first regenerator chamber 211, a second regenerator chamber 213, an oxidation chamber 217 and a flow control system.
  • a feed pipe 202 for supplying a feed gas stream from a source of feed gas stream 201
  • a discharge pipe 203 for discharging a first output gas stream
  • the flow control system of the RTO system 200 comprises a common switch valve 240 connecting to the feed pipe 202; a first connection pipe 233 and a second connection pipe 234 for connecting the common switch valve 240 to the first regenerator chamber 211 and the second regenerator chamber 213 respectively; an outlet pipe 235 for connecting the common switch valve 240 to the discharge pipe 203; an intermediate pipe 236 for connecting the common switch valve 240 to the inlet 228 of the oxidation chamber 217; and two valves 245, 246 positioned on the outlet pipe 235 and the intermediate pipe 236 respectively to control opening and closing of the corresponding pipe.
  • the common switch valve 240 operates at two states.
  • the feed pipe 202 is connected to the first connection pipe 233, and the second connection pipe 234 is connected to the outlet pipe 235 or the intermediate pipe 236.
  • the feed pipe 202 is connected to the second connection pipe 234, and the first connection pipe 233 is connected to the outlet pipe 235 or the intermediate pipe 236.
  • a second difference is that the second output gas stream discharged from an outlet 229 of the oxidation chamber 217 is introduced into a heat exchanger 260, instead of being introduced to the source of feed gas stream 201.
  • the heat contained in the second output gas stream may be transferred to a stream to be heated supplied by a pipe 238.
  • the RTO system 200 further comprises a central control system 250 for controlling the flow control system automatically, to make the RTO system 200 operate at different stages.
  • the central control system 250 sends control signals S1, S2 and S3 to the common switch valve 240 and the valves 245, 246 respectively, so that the common switch valve 240 is controlled in the first state or the second state, the valves 245, 246 are controlled in open state or close state.
  • the operation of the RTO system 200 may be controlled automatically by a computer.
  • the first step to start the RTO system 200 is to heat the heat exchange medium 220 in the first regenerator chamber 211, the second regenerator chamber 213, and the oxidation chamber 217 to a predetermined temperature.
  • An exemplary operation cycle of the RTO system 200 may comprise the steps of:
  • the oxidation chamber 117 in the RTO system 100 and the oxidation chamber 217 in the RTO system 200 are used to treat the residual feed gas stream which has not yet been oxidized when gas flow is reversed. Every time before reversing the flow direction of feed gas stream, the residual feed gas stream in the first or the second regenerator chamber is introduced to the oxidation chamber 117, 217 for treatment, where the pollutants in the residual feed gas stream are oxidized. Therefore the emission peaks issue of a conventional two-chamber RTO is solved. Furthermore, the RTO systems 100, 200 of the present disclosure have smaller footprint and reduced cost than a conventional three-chamber RTO. The different features of the RTO system 100 and the RTO system 200 can be combined in other embodiments of the present disclosure.
  • Fig. 3 shows a flow diagram of a method 300 for operating an RTO system in accordance with one embodiment of the present disclosure.
  • the RTO system comprises a feed pipe for supplying a feed gas stream, a discharge pipe for discharging a first output gas stream, a first regenerator chamber and a second regenerator chamber in fluid communication with a combustion chamber, and an oxidation chamber having an inlet and an outlet.
  • the method comprises the steps of:
  • Step 301 controlling the feed gas stream from the feed pipe flowing through the first regenerator chamber, the combustion chamber, the second regenerator chamber and the discharge pipe;
  • Step 303 controlling a residual feed gas stream in the first regenerator chamber flowing through the oxidation chamber;
  • Step 305 controlling the feed gas stream from the feed pipe flowing through the second regenerator chamber, the combustion chamber, the first regenerator chamber and the discharge pipe;
  • Step 307 controlling a residual feed gas stream in the second regenerator chamber flowing through the oxidation chamber.
  • the method 300 may further comprise a step of supplying a high temperature gas stream from the combustion chamber to the inlet of the oxidation chamber to heat the oxidation chamber when the temperature in the oxidation chamber is lower than the temperature required for oxidation of VOC contaminates.
  • the method 300 may further comprise a step of supplying at least part of a second output gas stream discharged from the outlet of the oxidation chamber to a source of the feed gas stream, so that the feed gas stream in the source of the feed gas stream is pre-heated.
  • the method 300 may further comprise a step of transferring heat from a second output gas stream discharged from the outlet of the oxidation chamber to a stream to be heated, so that the waste heat in the second output gas stream is reused.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Incineration Of Waste (AREA)

Abstract

L'invention concerne un système d'oxydation thermique régénératif (100) et un procédé de fonctionnement du système d'oxydation thermique régénératif (100). Le système d'oxydation thermique régénératif (100) comprend un tuyau d'alimentation (102) destiné à fournir un courant de gaz d'alimentation (101), un tuyau d'évacuation (103) destiné à évacuer un premier courant de gaz de sortie, une chambre de combustion (115), une première chambre de régénération (111) et une seconde chambre de régénération (113) en communication fluidique avec la chambre de combustion (115), une chambre d'oxydation (117) et un système de commande d'écoulement. La chambre d'oxydation (117) est utilisée pour traiter un courant de gaz d'alimentation résiduel lors d'une inversion d'écoulement de gaz, de sorte que des pics d'émission peuvent être évités.
PCT/CN2017/089712 2017-06-23 2017-06-23 Système d'oxydation thermique régénératif et procédé de fonctionnement de système d'oxydation thermique régénératif WO2018232722A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201780092423.2A CN110998186A (zh) 2017-06-23 2017-06-23 再生式热氧化器系统和操作再生式热氧化器系统的方法
PCT/CN2017/089712 WO2018232722A1 (fr) 2017-06-23 2017-06-23 Système d'oxydation thermique régénératif et procédé de fonctionnement de système d'oxydation thermique régénératif

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PCT/CN2017/089712 WO2018232722A1 (fr) 2017-06-23 2017-06-23 Système d'oxydation thermique régénératif et procédé de fonctionnement de système d'oxydation thermique régénératif

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110375313A (zh) * 2019-06-03 2019-10-25 扬州博林环保机械有限公司 一种新型蓄热一体式废气焚烧炉

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EP0888518B1 (fr) * 1996-03-21 2000-09-06 FHW-Brenntechnik GmbH Réservoir tampon pour un dispositif pour le traitment d'effluents gazeux, en particulier de gaz de carbonisation
EP1350552A2 (fr) * 2002-04-02 2003-10-08 Johannes Schedler Procédé et dispositif pour éliminer l'ammoniac des gaz de fumée
US20060121403A1 (en) * 2004-12-03 2006-06-08 Thornton Lyman L Regenerative thermal oxidizer
CN101940869A (zh) * 2010-06-13 2011-01-12 浙江逸盛石化有限公司 精对苯二甲酸氧化装置尾气的净化方法和装置
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EP0888518B1 (fr) * 1996-03-21 2000-09-06 FHW-Brenntechnik GmbH Réservoir tampon pour un dispositif pour le traitment d'effluents gazeux, en particulier de gaz de carbonisation
EP1350552A2 (fr) * 2002-04-02 2003-10-08 Johannes Schedler Procédé et dispositif pour éliminer l'ammoniac des gaz de fumée
US20060121403A1 (en) * 2004-12-03 2006-06-08 Thornton Lyman L Regenerative thermal oxidizer
CN101940869A (zh) * 2010-06-13 2011-01-12 浙江逸盛石化有限公司 精对苯二甲酸氧化装置尾气的净化方法和装置
CN105126539A (zh) * 2014-05-19 2015-12-09 卡夫里昂德国有限责任公司 用于净化未净化气体体积流的方法以及附属的装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110375313A (zh) * 2019-06-03 2019-10-25 扬州博林环保机械有限公司 一种新型蓄热一体式废气焚烧炉
CN110375313B (zh) * 2019-06-03 2021-03-30 扬州博林环保机械有限公司 一种蓄热一体式废气焚烧炉

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