CN114876612B - Tail gas grading recovery and cyclic conversion system of engine - Google Patents

Tail gas grading recovery and cyclic conversion system of engine Download PDF

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Publication number
CN114876612B
CN114876612B CN202210353617.6A CN202210353617A CN114876612B CN 114876612 B CN114876612 B CN 114876612B CN 202210353617 A CN202210353617 A CN 202210353617A CN 114876612 B CN114876612 B CN 114876612B
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component
gas
outlet end
inlet end
engine
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CN114876612A (en
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李格升
张熠
张尊华
郑映仪
阮智邦
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0857—Carbon oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

The invention discloses a tail gas grading recovery and cyclic conversion system of an engine, which is characterized in that a waste heat utilization component is arranged to collect waste heat of the tail gas, a water removal component is arranged to remove water from the cooled tail gas, a denitration component is arranged to reduce nitrogen oxides of the removed tail gas into nitrogen and water, a two-phase separation component is arranged to separate water-soluble and water-insoluble gases in mixed gas, ammonia is obtained by an ammonia distillation purification method, and the separated ammonia is conveyed to the denitration component, so that cyclic utilization is realized; and meanwhile, the gas which is not easy to dissolve in water is conveyed to a thermocatalytic circulating component so as to be separated under the action of a temperature control component to obtain carbon oxide gas, finally, the carbon oxide gas is conveyed to a carbon oxide catalytic reduction component to be subjected to catalytic reduction, and other mixed gas containing nitrogen is conveyed to a nitrogen separating component to be separated so as to obtain nitrogen, so that the subsequent secondary utilization is facilitated, and the recycling rate of the whole tail gas is improved.

Description

Tail gas grading recovery and cyclic conversion system of engine
Technical Field
The invention relates to the technical field of tail gas treatment, in particular to a tail gas grading recovery and cyclic conversion system of an engine.
Background
With the rapid development of industrialization, environmental pollution caused by emission of greenhouse gases, harmful gases and particulate matters has become serious. The engine is used as a main body of energy consumption in the transportation industry and is also a main body of air pollutant emission. In the related art, widely used engine fuels are mainly diesel oil and natural gas, and for natural gas engines, diesel engines or hybrid engines, NO is present in the exhaust products x Or CO x If these exhaust products are vented directly to the atmosphere, the air quality will be greatly affected. At present, the recycling device of the tail gas of the engine has lower recycling rate.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a tail gas grading recovery and cyclic conversion system of an engine, which can effectively improve the recovery and utilization rate of tail gas.
In one aspect, an embodiment of the present invention provides an exhaust gas staged recovery and cyclic conversion system of an engine, including:
the air inlet end of the waste heat utilization component is used for being connected with the engine;
the air inlet end of the water removing component is connected with the air outlet end of the waste heat utilizing component;
the first air inlet end of the denitration component is connected with the first air outlet end of the water removal component, the second air inlet end of the denitration component is connected with the ammonia oxygen air inlet end, and the air outlet end of the denitration component and the second air outlet end of the water removal component are connected to a first node;
the air inlet end of the two-phase separation component is connected with the first node, and the first air outlet end of the two-phase separation component is connected with the second air inlet end of the denitration component;
the air inlet end of the thermal catalytic circulation component is connected with the second air outlet end of the two-phase separation component, the temperature control end of the thermal catalytic circulation component is used for being connected with the temperature control component, and the first air outlet end of the thermal catalytic circulation component and the second air outlet end of the two-phase separation component are connected to a second node;
the air inlet end of the nitrogen separation component is connected with the second node;
and the air inlet end of the carbon oxide catalytic reduction component is connected with the second air outlet end of the thermocatalytic circulation component.
In some embodiments, the thermocatalytic cycle part comprises:
the gas inlet end of the first reactor is connected with the second gas outlet end of the two-phase separation component through a first valve, the first gas outlet end of the first reactor is connected with the second gas outlet end of the two-phase separation component through a second valve to a second node, and the second gas outlet end of the first reactor is connected with the gas inlet end of the carbon oxide catalytic reduction component through a third valve;
the gas inlet end of the second reactor is connected with the second gas outlet end of the two-phase separation component through a fourth valve, the first gas outlet end of the second reactor is connected with the second gas outlet end of the two-phase separation component through a fifth valve and is connected with a second node, and the second gas outlet end of the second reactor is connected with the gas inlet end of the carbon oxide catalytic reduction component through a sixth valve.
In some embodiments, the temperature control component comprises:
the first temperature control element is connected with the temperature control end of the first reactor;
the second temperature control element is connected with the temperature control end of the second reactor.
In some embodiments, the first reactor and the second reactor are each provided with a carbon oxide adsorbent.
In some embodiments, the water removal component includes a container and a water removal agent disposed within the container.
In some embodiments, the system further comprises:
the booster fan is arranged on a connecting pipeline between the air inlet end of the water removal component and the air outlet end of the waste heat utilization component.
In some embodiments, the system further comprises:
the needle valve is arranged on a connecting pipeline of the air inlet end of the thermocatalytic circulation part and the second air outlet end of the two-phase separation part.
In some embodiments, the system further comprises:
and the seventh valve is arranged on a connecting pipeline of the booster fan and the waste heat utilization component.
In some embodiments, the system further comprises:
the eighth valve is arranged on a connecting pipeline between the first air outlet end of the water removal component and the first air inlet end of the denitration component;
and the second air inlet end of the denitration component is connected with the ammonia oxygen air inlet end through the ninth valve.
In another aspect, an embodiment of the present invention provides an engine, where exhaust gas from the engine is treated by the system.
The tail gas grading recovery and cyclic conversion system of the engine provided by the embodiment of the invention has the following beneficial effects:
in the embodiment, the exhaust gas waste heat is collected by arranging the waste heat utilization component, the cooled exhaust gas is dehydrated by arranging the water removal component, nitrogen oxides of the dehydrated exhaust gas are reduced into nitrogen and water by the denitration component, then the water-soluble gas and the water-insoluble gas in the mixed gas are separated by the two-phase separation component, ammonia gas is obtained by an ammonia evaporation purification method, and the ammonia gas obtained by separation is conveyed to the denitration component, so that the recycling is realized; and meanwhile, the gas which is not easy to dissolve in water is conveyed to a thermocatalytic circulating component so as to be separated under the action of a temperature control component to obtain carbon oxide gas, finally, the carbon oxide gas is conveyed to a carbon oxide catalytic reduction component to be subjected to catalytic reduction, and other mixed gas containing nitrogen is conveyed to a nitrogen separating component to be separated so as to obtain nitrogen, so that the subsequent secondary utilization is facilitated, and the recycling rate of the whole tail gas is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of an engine exhaust staged recovery and cyclic conversion system according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a thermocatalytic cycle device according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number is understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
In the description of the present invention, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Referring to fig. 1, an embodiment of the present invention provides an exhaust gas staged recovery and cyclic conversion system of an engine, which includes a waste heat utilization part 110, a water removal part 120, a denitration part 130, a two-phase separation part 140, a thermocatalytic cyclic part 150, a nitrogen separation part 170, and a carbon oxide catalytic reduction part 180. Wherein an intake end of the waste heat utilization part 110 is used for connecting the engine 100; the air inlet end of the water removal component 120 is connected with the air outlet end of the waste heat utilization component 110; the first air inlet end of the denitration unit 130 is connected with the first air outlet end of the water removal unit 120, the second air inlet end of the denitration unit 130 is connected with the ammonia oxygen air inlet end, and the air outlet end of the denitration unit 130 and the second air outlet end of the water removal unit 120 are connected to a first node; the air inlet end of the two-phase separation member 140 is connected to the first node, and the first air outlet end of the two-phase separation member 140 is connected to the second air inlet end of the denitration member 130; the air inlet end of the thermocatalytic circulation part 150 is connected with the second air outlet end of the two-phase separation part 140, the temperature control end of the thermocatalytic circulation part 150 is used for being connected with the temperature control part 160, and the first air outlet end of the thermocatalytic circulation part 150 and the second air outlet end of the two-phase separation part 140 are connected with a second node; an air inlet end of the nitrogen separation part 170 is connected with the second node; the intake end of the oxycarbide catalytic reduction unit 180 is coupled to the second exhaust end of the thermocatalytic cycle unit 150.
In this embodiment, after the exhaust gas of the engine enters the waste heat utilization component, the waste heat utilization component recovers heat in the exhaust gas, so that the temperature of the exhaust gas is reduced, and the cooled exhaust gas is conveyed into the water removal component for water removal. Specifically, the water removal component comprises a container and a water removal agent, wherein the water removal agent is arranged in the container. After the tail gas enters the container, the water in the tail gas can be absorbed by the water remover. After removing moisture in the tail gas, conveying part of the tail gas into a denitration component, simultaneously conveying ammonia and oxygen into the denitration component through an ammonia oxygen inlet end, reducing nitrogen oxides in the input tail gas into nitrogen by the denitration component under the action of the ammonia, then inputting the reduced nitrogen and other gases into a two-phase separation component by combining the residual part of the tail gas, separating components easy to liquefy such as water and ammonia by the two-phase separation component through a low-temperature condensation technology, and conveying the liquefied mixed solution obtained by separation to a second inlet end of the denitration component through a gas supplementing pipeline, so that the denitration component is convenient for recycling the ammonia. And conveying the carbon oxide gas which is not easy to liquefy into a thermocatalytic circulation component so as to separate the carbon oxide gas, and conveying the separated carbon oxide gas into a carbon oxide catalytic reduction component so as to complete the process of reducing the carbon oxide into chemical dye. Simultaneously, the nitrogen and other gases which are not easy to liquefy are conveyed into the nitrogen separation component so as to be separated and obtained, thereby facilitating subsequent collection and purification and secondary utilization.
In this embodiment, a booster fan 190 is further disposed on the connection line between the air outlet end of the waste heat utilization component 110 and the air inlet end of the water removal component 120 of the system shown in fig. 1, so as to change the pressure of the air entering the water removal component through the booster fan. Meanwhile, a valve is further disposed on the connection line between the blower 190 and the air outlet end of the waste heat utilization component 110, and the valve is used as a seventh valve 210, and the seventh valve 210 can control the flow of air entering the booster blower. In addition, in the system of the embodiment, a valve is also disposed on the connection line between the first air outlet end of the water removal component 120 and the first air inlet end of the denitration component 130, and the valve is used as the eighth valve 220, so that the eighth valve 220 can effectively regulate the amount of exhaust gas entering the denitration component 130. A valve is also disposed on the second air inlet end of the denitration unit 130, and the valve is used as a ninth valve 230, and the ninth valve 230 can effectively regulate the flow of ammonia and oxygen entering the denitration unit 130. A valve is also provided on the connection line between the outlet end of the water removal unit 120 and the outlet end of the denitration unit 130, and the valve can adjust the amount of tail gas output from the outlet end of the water removal unit to the two-phase separation unit. A valve is also provided on the connection of the second outlet end of the two-phase separation element 140 to the inlet end of the nitrogen separation element 170, which valve allows for adjusting the amount of mixed gas comprising nitrogen that the two-phase separation element delivers to the nitrogen separation element. Meanwhile, a needle valve 200 is disposed on a connection pipe between the inlet end of the thermocatalytic circulation part 150 and the second outlet end of the two-phase separation part 140, and the needle valve 200 is used for adjusting the amount of gas delivered from the two-phase separation part to the thermocatalytic circulation part.
In the present embodiment, as shown in fig. 2, the thermocatalytic cycle part includes a first reactor 151 and a second reactor 152. Wherein, the first reactor 151 and the second reactor 152 are provided with a carbon oxide adsorbent. The gas inlet end of the first reactor 151 is connected to the second gas outlet end of the two-phase separation member through a first valve 153, the first gas outlet end of the first reactor 151 is connected to the second node through a second valve 154 and the second gas outlet end of the first reactor 151 is connected to the gas inlet end of the carbon oxide catalytic reduction member through a third valve 155; the gas inlet end of the second reactor 152 is connected to the second gas outlet end of the two-phase separation component through a fourth valve 156, the first gas outlet end of the second reactor 152 is connected to the second node through a fifth valve 157 and the second gas outlet end of the two-phase separation component is connected to the gas inlet end of the carbon oxide catalytic reduction component through a sixth valve 158.
Specifically, this example fills a laboratory prepared high-efficiency selective adsorbent by using parallel adsorption reactors as the reaction body. After the adsorption reaction starts, the first valve and the second valve are opened, the rest valves are in a closed state, the mixed waste gas passes through the first reactor, the mixed gas enters the next-stage device after the adsorption is completed, after the first reactor is saturated, the fourth valve, the fifth valve and the third valve are opened, and the first valve and the second valve are closed, so that the mixed waste gas enters the second reactor to undergo adsorption reaction. At this time, the first reactor is heated at a high temperature to make CO x And the desorption is carried into the carbon oxide catalytic reduction component for recovery through a desorption pipeline. Repeating the above operation after the second reactor is saturated to achieve the cyclic adsorption-desorption effect, and CO x After the desorption is completed, the catalyst enters a carbon oxide catalytic reduction part to be converted into chemicalFuel is learned for circulating combustion in the engine.
In an embodiment of the present application, the temperature control component includes a first temperature control element and a second temperature control element. The first temperature control element is connected with the temperature control end of the first reactor; the second temperature control element is connected with the temperature control end of the second reactor. In the embodiment, the two reactors are respectively controlled by respectively arranging two independent temperature control elements, so that the working stability is effectively improved.
For example, when the present embodiment is applied to an ammonia-fueled engine, the exhaust gas component is NO after the ammonia fuel is sufficiently combusted in the engine x 、NH 3 、O 2 、H 2 O, etc., after waste heat utilization, the mixed waste gas enters a water removal component through a supercharger, the mixed gas after water removal is sent into an SCR catalytic reduction device through a bypass, and ammonia and oxygen are complemented through an ammonia oxygen inlet end to start denitration reaction. After the reaction is fully completed, the mixed gas enters a condensing/gas-liquid two-phase separating component, the liquid-phase ammonia-water mixture is evaporated, purified and dehydrated, and then ammonia gas is continuously sent into an engine or an SCR catalytic reduction device for secondary use, and N is 2 、O 2 The rest of the mixed gas is sent into N by a bypass 2 And a separation device.
When the embodiment is applied to a natural gas engine, after the natural gas is fully combusted in the engine, the tail gas component is NO x ，CO 2 ，O 2 ，H 2 O, etc., after waste heat of the waste gas is utilized, the mixed gas enters a water removing component through a supercharger to remove water, tail gas is directly sent into an SCR catalytic reduction device through a bypass, and ammonia and oxygen are complemented through an ammonia oxygen inlet end to start denitration reaction. After the reaction is fully completed, the mixed gas enters a condensing/gas-liquid two-phase separating component, the liquid phase ammonia water mixture is dehydrated and then is sent to an engine or an SCR catalytic reduction device for secondary use, and CO 2 、O 2 And the rest mixed gas enters a circulating adsorption-desorption device through needle valve control to fully capture the carbon oxides, a temperature control element is adopted to control the reaction temperature, the optimal adsorption condition of the carbon oxides is searched, and after on-line heating and desorption, the mixed gas is sent into a catalytic reduction device to synthesize fuel and is sent into an engine to be combusted secondarily. On the other hand, the mixture is fed into N 2 SeparationAnd (3) a device.
In summary, the embodiment selects the corresponding energy recovery device for the multi-component tail gas generated by various mixed fuels, and is convenient and efficient. Corresponding processing device is selected according to the fuel property, and is controlled by a bypass switch, and the residual NH is reduced by SCR 3 、O 2 CO and CO 2 The catalytic reduction chemical fuel can be respectively sent to the SCR device and the engine for reuse, so that the fuel recycling rate is improved, and the energy is saved; and the thermocatalytic cyclic adsorption device can control CO through efficient selective adsorbents prepared in a laboratory x Can realize on-line CO desorption under the operating condition of the engine x After recovery, the mixture is converted into chemical fuel by a catalytic reduction device, and the chemical fuel is sent into an engine for secondary combustion, so that CO is proposed x A scheme and an implementation device for efficiently recovering and catalytically reducing synthetic fuel on line.
The embodiment of the invention provides an engine, and tail gas of the engine is treated through the system.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.

Claims (9)

1. An exhaust gas staged recovery and cyclic conversion system of an engine, comprising:
the air inlet end of the waste heat utilization component is used for being connected with the engine;
the air inlet end of the water removing component is connected with the air outlet end of the waste heat utilizing component;
the first air inlet end of the denitration component is connected with the first air outlet end of the water removal component, the second air inlet end of the denitration component is connected with the ammonia oxygen air inlet end, and the air outlet end of the denitration component and the second air outlet end of the water removal component are connected to a first node;
the air inlet end of the two-phase separation component is connected with the first node, and the first air outlet end of the two-phase separation component is connected with the second air inlet end of the denitration component;
the air inlet end of the thermal catalytic circulation component is connected with the second air outlet end of the two-phase separation component, the temperature control end of the thermal catalytic circulation component is used for being connected with the temperature control component, and the first air outlet end of the thermal catalytic circulation component and the second air outlet end of the two-phase separation component are connected to a second node;
the air inlet end of the nitrogen separation component is connected with the second node;
the gas inlet end of the carbon oxide catalytic reduction component is connected with the second gas outlet end of the thermocatalytic cycle component;
wherein the thermocatalytic cycle part comprises:
the gas inlet end of the first reactor is connected with the second gas outlet end of the two-phase separation component through a first valve, the first gas outlet end of the first reactor is connected with the second gas outlet end of the two-phase separation component through a second valve to a second node, and the second gas outlet end of the first reactor is connected with the gas inlet end of the carbon oxide catalytic reduction component through a third valve;
the gas inlet end of the second reactor is connected with the second gas outlet end of the two-phase separation component through a fourth valve, the first gas outlet end of the second reactor is connected with the second gas outlet end of the two-phase separation component through a fifth valve and is connected with a second node, and the second gas outlet end of the second reactor is connected with the gas inlet end of the carbon oxide catalytic reduction component through a sixth valve.
2. The system for staged recovery and cyclic conversion of exhaust gas of an engine of claim 1, wherein the temperature control means comprises:
the first temperature control element is connected with the temperature control end of the first reactor;
the second temperature control element is connected with the temperature control end of the second reactor.
3. The system for staged recovery and cyclic conversion of exhaust gas from an engine of claim 1, wherein the first reactor and the second reactor are each provided with a carbon oxide adsorbent.
4. The system of claim 1, wherein the water removal means comprises a vessel and a water removal agent disposed within the vessel.
5. The system for staged recovery and cyclic conversion of exhaust gas from an engine of claim 1, further comprising:
the booster fan is arranged on a connecting pipeline between the air inlet end of the water removal component and the air outlet end of the waste heat utilization component.
6. The system for staged recovery and cyclic conversion of exhaust gas from an engine of claim 1, further comprising:
the needle valve is arranged on a connecting pipeline of the air inlet end of the thermocatalytic circulation part and the second air outlet end of the two-phase separation part.
7. An engine exhaust staged recovery and recycling conversion system in accordance with claim 5, further comprising:
and the seventh valve is arranged on a connecting pipeline of the booster fan and the waste heat utilization component.
8. The system for staged recovery and cyclic conversion of exhaust gas from an engine of claim 1, further comprising:
the eighth valve is arranged on a connecting pipeline between the first air outlet end of the water removal component and the first air inlet end of the denitration component;
and the second air inlet end of the denitration component is connected with the ammonia oxygen air inlet end through the ninth valve.
9. An engine, characterized in that the exhaust gases of the engine are treated by a system according to any one of claims 1-8.
CN202210353617.6A 2022-04-02 2022-04-02 Tail gas grading recovery and cyclic conversion system of engine Active CN114876612B (en)

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WO2021088524A1 (en) * 2019-11-06 2021-05-14 中冶长天国际工程有限责任公司 System and method for denitration of flue gas by carbon monoxide

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EP2301886A1 (en) * 2009-09-03 2011-03-30 Ammonia Casale S.A. Waste heat recovery in a chemical process and plant, particularly for the synthesis of ammonia
US9221685B2 (en) * 2012-04-16 2015-12-29 Seerstone Llc Methods of capturing and sequestering carbon
GB2540798A (en) * 2015-07-28 2017-02-01 John Brown Allan Method of recaiming and utilizing water and carbon dioxide from the exhaust system of an internal combustion engine to achieve a near zero greenhouse gas
CN113828148B (en) * 2020-06-23 2023-06-27 中冶长天国际工程有限责任公司 Flue gas treatment system and flue gas treatment method for efficiently utilizing carbon monoxide

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