CN113845942B - Coking and flue gas treatment system and method - Google Patents
Coking and flue gas treatment system and method Download PDFInfo
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- CN113845942B CN113845942B CN202111435864.2A CN202111435864A CN113845942B CN 113845942 B CN113845942 B CN 113845942B CN 202111435864 A CN202111435864 A CN 202111435864A CN 113845942 B CN113845942 B CN 113845942B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/58—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels combined with pre-distillation of the fuel
- C10J3/60—Processes
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/1603—Integration of gasification processes with another plant or parts within the plant with gas treatment
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Abstract
The embodiment of the disclosure provides a coking and flue gas treatment system and a method, wherein the system comprises: the device comprises a coking device, an oxygen supply unit, a gas supply unit, a flow regulating unit, a gas activation unit and a gas treatment unit. In the embodiment of the disclosure, the flow regulating unit can regulate the concentration of oxygen in the combustion-supporting gas by regulating the flow of the gas, so that the concentration of oxygen in the combustion-supporting gas is greater than that of oxygen in the air, thereby realizing oxygen-enriched combustion, reducing the generation of nitrogen oxides in the flue gas of the coke oven, enriching carbon dioxide in the burnt waste gas, and being beneficial to the capture and utilization of carbon dioxide; carbon dioxide and water vapor in the coke oven flue gas are treated by the gas activation unit and the gas treatment unit to obtain synthesis gas, and the synthesis gas can be used as a chemical raw material, so that the emission of the carbon dioxide is reduced, waste is turned into wealth, low-carbon emission reduction is realized, and green production is realized.
Description
Technical Field
The disclosure relates to the technical field of coking and waste gas treatment, in particular to a coking and flue gas treatment system and a method.
Background
The related coking production technology can be divided into two main industrial technologies of chemical product recovery and chemical product recovery, wherein the coking production of the chemical product recovery requires external air and gas to produce main products of coke and chemical byproducts, high-temperature flue gas generated by combustion is discharged after heat exchange in a furnace, and waste gas containing CO and discharged into the environment2、SO2、NOXAnd environmentally unfriendly gases such as smoke dust; coking production of innoxious product recovery, the raw coke gas of producing certainly only needs the combustion-supporting of external air supply, and the main product is coke, and the waste heat converts the electric energy into, and the raw coke gas is discharged after waste heat recovery system with the high temperature flue gas that combustion-supporting gas burning generated, and the main problem has: the main product structure is too single, the problem of waste gas emission of the coking industry still exists, and green coking production is not realized.
Therefore, the related coking production technologies all have the problem that green coking production cannot be realized, so that in order to solve the problem of green production in the coking process, it is necessary to develop a coking and flue gas treatment system capable of reducing exhaust gas emission.
Disclosure of Invention
An object of the disclosed embodiments is to provide a coking and flue gas treatment system and method capable of reducing exhaust gas emissions. The specific technical scheme is as follows:
embodiments of a first aspect of the present disclosure provide a coking and flue gas treatment system, comprising: a coking unit having a gas supply duct and a gas exhaust duct, the gas supply duct comprising a first gas supply duct and a second gas supply duct;
the oxygen supply unit is connected with the first gas supply pipeline;
the air supply unit is connected with the second air supply pipeline;
a flow rate adjusting unit provided on the first air supply duct and the second air supply duct;
the gas activation unit is connected with the exhaust pipeline and the oxygen supply unit; and
a gas treatment unit connected to the gas activation unit through a first recovery conduit;
the oxygen supply unit is configured to supply pure oxygen, and the air supply unit is configured to supply air or carbon dioxide or air and carbon dioxide;
the flow regulating unit is configured to regulate the flow of the gas passing through the first gas supply pipeline and the second gas supply pipeline;
the coking device is configured to utilize pure oxygen and air, or pure oxygen and carbon dioxide, or pure oxygen, air and carbon dioxide to mix to obtain combustion-supporting gas for coking production;
the gas activation unit is configured to mix coke oven flue gas discharged by the exhaust pipeline with pure oxygen and water vapor to obtain a reaction gas source, and the reaction gas source and a carbonized material are subjected to activation reaction to obtain a mixed gas and activated carbon, wherein the mixed gas comprises synthesis gas, waste gas and carbon dioxide;
the gas processing unit is configured to separate the mixed gas to obtain the synthesis gas.
According to the coking and flue gas treatment system disclosed by the embodiment of the disclosure, pure oxygen provided by the oxygen supply unit enters the coking device through the first air supply pipeline, air or carbon dioxide or air and carbon dioxide provided by the air supply unit enters the coking device through the second air supply pipeline, the flow regulating unit can regulate the flow of gas passing through the first air supply pipeline and the second air supply pipeline, and the coking device utilizes the mixture of the pure oxygen and the air, or the pure oxygen and the carbon dioxide, or the pure oxygen and the air and the carbon dioxide to obtain combustion-supporting gas for coking production. The coke oven flue gas generated in the coking device enters a gas activation unit through an exhaust pipeline, pure oxygen provided by an oxygen supply unit enters the gas activation unit, the gas activation unit utilizes the coke oven flue gas to mix with the pure oxygen and water vapor to obtain a reaction gas source, the reaction gas source and a carbonized material are subjected to activation reaction to obtain a mixed gas and activated carbon, the mixed gas comprises synthesis gas, waste gas and carbon dioxide, the mixed gas enters a gas treatment unit through a first recovery pipeline, and the synthesis gas is obtained after gas separation. In the embodiment of the disclosure, the flow regulating unit can regulate the concentration of oxygen in the combustion-supporting gas by regulating the flow of the gas, so that the concentration of oxygen in the combustion-supporting gas is greater than that of oxygen in the air, thereby realizing oxygen-enriched combustion, reducing the generation of nitrogen oxides in the flue gas of the coke oven, enriching carbon dioxide in the burnt waste gas, and being beneficial to the capture and utilization of carbon dioxide; carbon dioxide and water vapor in the coke oven flue gas are treated by the gas activation unit and the gas treatment unit to obtain synthesis gas, and the synthesis gas can be used as a chemical raw material, so that the emission of the carbon dioxide is reduced, waste is turned into wealth, low-carbon emission reduction is realized, and green production is realized.
In addition, a coking and flue gas treatment system according to an embodiment of the present disclosure may also have the following additional technical features:
in some embodiments of the present disclosure, the system further comprises a preheating unit disposed within the coking unit, the preheating unit configured to preheat the combustion gases.
In some embodiments of the present disclosure, the gas processing unit is further configured to separate the gas mixture to obtain carbon dioxide and waste gas, the gas processing unit is connected to the gas activation unit through a second recovery pipeline, the second recovery pipeline is used to introduce the waste gas into the gas activation unit, the gas processing unit is connected to the gas supply unit through a third recovery pipeline, and the third recovery pipeline is used to introduce the carbon dioxide into the gas supply unit.
In some embodiments of the present disclosure, the system further comprises a water vapor supply unit connected to the gas activation unit.
In some embodiments of the present disclosure, the system further includes a flue gas temperature regulating and conditioning unit, the flue gas temperature regulating and conditioning unit includes a gas detection element, a temperature detection element, a flow regulating valve and a central control system, the flow regulating valves are respectively disposed on the exhaust pipeline, between the oxygen supply unit and the gas activation unit, and between the steam supply unit and the gas activation unit, the gas activation unit includes a premixing chamber, the premixing chamber is used for mixing coke oven flue gas with pure oxygen and steam to obtain a reaction gas source, the gas detection element and the temperature detection element are disposed in the premixing chamber, the gas detection element is used for detecting concentrations of carbon dioxide and steam in the reaction gas source, and the temperature detection element is used for detecting a temperature of the reaction gas source in the premixing chamber; the central control system is configured to control the three flow regulating valves to respectively regulate the flow of the coke oven flue gas passing through the exhaust pipeline, the flow of the pure oxygen passing between the oxygen supply unit and the gas activation unit and the flow of the water vapor passing between the water vapor supply unit and the gas activation unit according to the concentrations of the carbon dioxide and the water vapor detected by the gas detection element and the temperature detected by the temperature detection element.
In some embodiments of the present disclosure, the system further comprises a waste heat recovery device disposed between the gas activation unit and the gas treatment unit, the waste heat recovery device configured to recover heat of the mixture.
In some embodiments of the present disclosure, the heat recovery device comprises a heat recovery boiler and the coking device is a heat recovery coke oven.
In some embodiments of the present disclosure, the flow regulating unit includes two flow regulating valves respectively provided on the first air supply duct and the second air supply duct.
An embodiment of a second aspect of the present disclosure provides a coking and flue gas treatment method, which is implemented by applying the coking and flue gas treatment system in the embodiment of the first aspect, and the coking and flue gas treatment method includes:
adjusting the flow of the gas passing through the first gas supply pipeline and the second gas supply pipeline;
introducing pure oxygen supplied by the oxygen supply unit and air or carbon dioxide or air and carbon dioxide supplied by the air supply unit into the coking device;
the coking device carries out coking production under the auxiliary action of combustion-supporting gas obtained by mixing pure oxygen and air, or pure oxygen and carbon dioxide, or pure oxygen, air and carbon dioxide;
providing water vapor, introducing the water vapor, coke oven flue gas discharged by a coking device and pure oxygen supplied by an oxygen supply unit into a gas activation unit, and mixing the water vapor and the coke oven flue gas in the gas activation unit to obtain a reaction gas source;
enabling a reaction gas source and a carbonized material to perform an activation reaction in a gas activation unit to obtain mixed gas and activated carbon;
and separating the mixed gas in the gas treatment unit to obtain the synthesis gas.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other embodiments can be obtained by using the drawings without creative efforts.
FIG. 1 is a schematic illustration of a coking and flue gas treatment system according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of another coking and flue gas treatment system according to an embodiment of the present disclosure.
Detailed Description
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 only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments derived from the present application by a person of ordinary skill in the art based on the embodiments in the present disclosure are within the scope of protection of the present disclosure.
As shown in fig. 1, a first aspect of the present application proposes a coking and flue gas treatment system comprising: a coking unit 1 having a gas supply duct a and a gas exhaust duct b, the gas supply duct a including a first gas supply duct a1 and a second gas supply duct a 2; an oxygen supply unit 2 connected to the first gas supply duct a 1; an air supply unit 3 connected to the second air supply duct a 2; a flow rate adjusting unit 4 provided on the first air supply duct a1 and the second air supply duct a 2; a gas activation unit 5 connected to the exhaust pipe b and the oxygen supply unit 2; and a gas treatment unit 6 connected to the gas activation unit 5 through a first recovery conduit c 1;
the oxygen supply unit 2 is configured to supply pure oxygen, and the air supply unit 3 is configured to supply air or carbon dioxide or air and carbon dioxide; the flow rate adjusting unit 4 is configured to adjust the flow rates of the gas passing through the first and second gas supply ducts a1, a 2; the coking device 1 is configured to utilize pure oxygen and air, or pure oxygen and carbon dioxide, or pure oxygen and air and carbon dioxide to mix to obtain combustion-supporting gas for coking production; the gas activation unit 5 is configured to mix the coke oven flue gas discharged by the exhaust pipeline b with pure oxygen and water vapor to obtain a reaction gas source, and perform an activation reaction on the reaction gas source and a carbonized material to obtain a mixed gas and activated carbon, wherein the mixed gas comprises synthesis gas, waste gas and carbon dioxide; the gas treatment unit 6 is configured to separate the mixed gas to obtain the synthesis gas.
According to the coking and flue gas treatment system of the embodiment of the disclosure, pure oxygen provided by the oxygen supply unit 2 enters the coking device 1 through the first air supply pipeline a1, air or carbon dioxide or air and carbon dioxide provided by the air supply unit 3 enters the coking device 1 through the second air supply pipeline a2, the flow regulating unit 4 can regulate the flow of gas passing through the first air supply pipeline a1 and the second air supply pipeline a2, and the coking device 1 utilizes pure oxygen and air, or pure oxygen and carbon dioxide, or pure oxygen and air and carbon dioxide to mix to obtain combustion-supporting gas for coking production. The coke oven flue gas generated in the coking device 1 enters a gas activation unit 5 through an exhaust pipeline b, pure oxygen provided by an oxygen supply unit 2 enters the gas activation unit 5, the gas activation unit utilizes the mixture of the coke oven flue gas, the pure oxygen and water vapor to obtain a reaction gas source, the reaction gas source and a carbonized material are subjected to activation reaction to obtain a mixed gas and activated carbon, the mixed gas comprises synthesis gas, waste gas and carbon dioxide, the mixed gas enters a gas treatment unit 6 through a first recovery pipeline c1, and the synthesis gas is obtained after gas separation. In the embodiment of the disclosure, the flow regulating unit 4 can regulate the concentration of oxygen in the combustion-supporting gas by regulating the flow of the gas, so that the concentration of oxygen in the combustion-supporting gas is greater than that of oxygen in the air, thereby realizing oxygen-enriched combustion, reducing the generation of nitrogen oxides in the flue gas of the coke oven, enriching carbon dioxide in the burnt waste gas, and being beneficial to the capture and utilization of carbon dioxide; carbon dioxide and water vapor in the coke oven flue gas are treated by the gas activation unit 5 to obtain activated carbon and mixed gas, and the gas is separated by the gas treatment unit 6 to obtain synthesis gas, wherein the activated carbon has an adsorption effect and can adsorb harmful gases, and the synthesis gas can be used as a chemical raw material, so that the emission of carbon dioxide is reduced, waste is changed into wealth, low-carbon emission reduction is realized, and green production is realized.
It will be appreciated that synthesis gas comprises carbon monoxide and hydrogen, which may be used as feed gases for chemical production; the generated carbon monoxide and hydrogen can also be used as reducing agents in the steel and metallurgy industries, generally called as reducing gas, and can also be used as clean energy through gas separation to obtain hydrogen independently.
In some embodiments of the present disclosure, the flow rate adjusting unit 4 may adjust the concentration of oxygen in the combustion-supporting gas by adjusting the flow rate of the gas passing through the first gas supply pipeline a1 and the second gas supply pipeline a2, so that the volume ratio of the oxygen is greater than 21%, even if the concentration of the oxygen in the combustion-supporting gas is greater than the concentration of the oxygen in the air, thereby implementing oxygen-enriched combustion, which may reduce the generation of nitrogen oxides in the coke oven flue gas, and meanwhile, the carbon dioxide in the burnt exhaust gas is enriched, which is beneficial to the capture and utilization of the carbon dioxide.
In some embodiments of the present disclosure, the pure oxygen provided in the oxygen supply unit 2 may be obtained directly from the plant, and the oxygen supply unit 2 may also include an oxygen generator from which the pure oxygen is produced.
In some embodiments of the present disclosure, the air supply unit 3 is configured to provide air or carbon dioxide or air and carbon dioxide, that is, the combustion-supporting gas may be composed of pure oxygen and air, or may be composed of pure oxygen and carbon dioxide, or may be composed of pure oxygen, air and carbon dioxide, as long as after being adjusted by the flow adjusting unit, the oxygen concentration in the combustion-supporting gas is greater than the oxygen concentration in the air, so that oxygen-enriched combustion can be achieved, and the generation of nitrogen oxides in the coke oven flue gas can be reduced.
In some embodiments of the present disclosure, the char material required for the gas activation unit 5 may be purchased ex-situ.
In some embodiments of the present disclosure, the system further includes a carbonized material preparation system (not shown in the figure), the carbonized material preparation system is connected to the gas activation unit 5, the carbonized material preparation system is configured to prepare a carbonized material, and the carbonized material preparation system is configured to carbonize the coal raw material to obtain the carbonized material.
In some embodiments of the present disclosure, the gas processing unit 6 may be a purification and flue gas separation device, such as a pressure swing adsorption separation device and a desulfurization device, and the mixed gas is desulfurized by the desulfurization device and then enters the pressure swing adsorption separation device for gas separation to obtain a synthesis gas (containing carbon monoxide and hydrogen).
In some embodiments of the present disclosure, as shown in fig. 2, the system further comprises a preheating unit 7, the preheating unit 7 being disposed within the coking plant 1, the preheating unit 7 being configured to preheat the combustion gas. The coke oven flue gas generated by the coking device 1 can firstly pass through the preheating unit 7 to preheat the combustion-supporting gas in the preheating unit 7, and then the coke oven flue gas enters the exhaust pipeline b. After being preheated by the preheating unit 7, the combustion-supporting gas is introduced into the coking device 1 for coking, so that the coking heat consumption can be effectively reduced, the coking period is shortened, and the production efficiency is improved.
In some embodiments of the present disclosure, as shown in fig. 2, the gas processing unit 6 is further configured to separate the mixed gas to obtain carbon dioxide and waste gas, respectively, the gas processing unit 6 is connected to the gas activation unit 5 through a second recovery pipeline c2, the second recovery pipeline c2 is used for introducing the waste gas into the gas activation unit 5, the gas processing unit 6 is connected to the gas supply unit 3 through a third recovery pipeline c3, and the third recovery pipeline c3 is used for introducing the carbon dioxide into the gas supply unit 3. The exhaust gas mainly contains nitrogen, water vapor and the like, and the exhaust gas is only a very small part in the mixed gas.
The carbon dioxide separated by the gas treatment unit 6 enters the gas supply unit 3 through the third recovery pipeline c3, so that the gas supply unit 3 can utilize the recovered carbon dioxide and the pure oxygen provided by the oxygen supply unit 2 to form combustion-supporting gas for coking, the carbon dioxide is circulating gas and can be used for generating synthesis gas and recovering the synthesis gas for coking, and thus, the whole system has no carbon dioxide emission, really realizes 'carbon neutralization', and realizes green coking.
The exhaust gas separated by the gas treatment unit 6 enters the gas activation unit 5 through the second recovery pipe c2, so that the exhaust gas can be prevented from being discharged into the air, and thus air pollution is avoided, the exhaust gas introduced into the gas activation unit 5 is mainly nitrogen, water vapor and the like, and the nitrogen is inert gas, so that the exhaust gas does not react with the carbonized material and other gases in the gas activation unit 5, and the normal operation of the gas activation unit 5 is not affected.
In some embodiments of the present disclosure, as shown in fig. 2, the system further comprises a water vapor supply unit 8, the water vapor supply unit 8 is connected to the gas activation unit 5, and the water vapor supplied by the water vapor supply unit 8 can be used to adjust the temperature of the reaction gas source and the concentration of water in the reaction gas source.
In some embodiments of the present disclosure, as shown in fig. 2, the system further includes a flue gas temperature regulating and conditioning unit 9, the flue gas temperature regulating and conditioning unit 9 includes a gas detecting element, a temperature detecting element, a flow regulating valve and a central control system, the flow regulating valves are respectively disposed on the exhaust pipe b, between the oxygen supply unit 2 and the gas activation unit 5, and between the steam supply unit 8 and the gas activation unit 5, the gas activation unit 5 includes a premixing chamber, the premixing chamber is used for mixing the coke oven flue gas with pure oxygen and steam to obtain a reaction gas source, the gas detecting element and the temperature detecting element are disposed in the premixing chamber, the gas detecting element is used for detecting the concentrations of carbon dioxide and steam in the reaction gas source, and the temperature detecting element is used for detecting the temperature of the reaction gas source in the premixing chamber; the central control system is configured to control the three flow regulating valves to respectively regulate the flow rate of the coke oven flue gas passing through the exhaust pipeline b, the flow rate of the pure oxygen passing between the oxygen supply unit 2 and the gas activation unit 5, and the flow rate of the water vapor passing between the water vapor supply unit 8 and the gas activation unit 5 according to the concentrations of the carbon dioxide and the water vapor detected by the gas detection element and the temperature detected by the temperature detection element. It will be appreciated that the temperature sensing element may be a temperature sensor and the gas sensing element may be a gas sensor, for example a semiconductor type gas sensor may be used to sense the concentration of carbon dioxide and a thermally conductive type gas sensor may be used to sense the concentration of water vapor.
Through the flow of adjusting vapor, can adjust the concentration of vapor in the reaction air supply, through the concentration of adjusting water in the reaction air supply and then adjust the hydrocarbon ratio in the reaction air supply, and then adjust the output of reaction product, for example, the vapor that lets in is a little more, and hydrogen element in the reaction air supply will be corresponding a lot more, and the output of hydrogen will be corresponding a lot more in the reaction product.
In some embodiments of the present disclosure, the supplementary carbon material, for example, coal, charcoal, etc., may be further added to the gas activation unit 5, so that the supplementary carbon material and the gas generated in the activation process in the gas activation unit 5 are combusted to obtain carbon dioxide, thereby adjusting the concentration of the carbon dioxide in the reaction gas source, and further adjusting the hydrocarbon ratio in the reaction gas source by adjusting the concentration of the carbon dioxide in the reaction gas source, thereby adjusting the yield of the reaction product.
In some embodiments of the present disclosure, the composition and yield of the reaction product can be adjusted by controlling the amounts of the coke oven gas, the pure oxygen, the steam and the carbonized material, for example, when the carbonized material is excessive, the activated carbon and the synthesis gas containing carbon monoxide and hydrogen can be obtained by the activation reaction, and when the amount of the carbon is small, only the gasification reaction occurs in the gas activation unit 5 to generate the synthesis gas containing carbon monoxide and hydrogen, so that the composition and yield of the reaction product can be adjusted by controlling the amounts of the coke oven gas, the pure oxygen, the steam and the carbonized material.
In some embodiments of the present disclosure, as shown in fig. 2, the system further comprises a waste heat recovery device 10, the waste heat recovery device 10 is disposed between the gas activation unit 5 and the gas treatment unit 6, and the waste heat recovery device 10 is configured to recover heat of the mixture.
The waste heat recovery device 10 can recover waste heat to obtain steam, and the obtained steam can be used for driving a steam turbine generator to generate electricity.
In some embodiments of the present disclosure, the waste heat recovery device 10 may be connected to the water vapor supply unit 8 through a pipeline, so that the steam obtained by recovering the waste heat by the waste heat recovery device 10 may be introduced into the water vapor supply unit 8 through the pipeline.
In some embodiments of the present disclosure, the heat recovery device 10 comprises a heat recovery boiler and the coking device 1 is a heat recovery coke oven. The first choice is a heat exchange vertical heat recovery coke oven, and the heat exchange vertical heat recovery coke oven can also be a horizontal heat recovery coke oven.
The heat recovery coke oven comprises a furnace top, a carbonization chamber, a combustion chamber, a heat exchange chamber, a preheating unit, a flue and other main structures; the coking coal is combusted, heat-transferred, heated and dry distilled in the coking chamber to form coke and generate high-temperature raw coke gas, the high-temperature raw coke gas and combustion-supporting gas are combusted in the combustion chamber to generate high-temperature coke oven flue gas, and the high-temperature coke oven flue gas is discharged through a flue after heat exchange by the preheating unit.
It is understood that the preheating unit in the heat recovery coke oven can preheat the combustion gas. After the gas from the first gas supply pipeline a1 and the second gas supply pipeline a2 enters the heat recovery coke oven to be mixed to obtain combustion-supporting gas, the gas can be preheated in the preheating unit, and then the preheated combustion-supporting gas is used for coking, so that the coking heat consumption can be effectively reduced, the coking period is shortened, and the production efficiency is improved.
In some embodiments of the present disclosure, the flow rate adjusting unit 4 includes two flow rate adjusting valves respectively provided on the first air supply duct a1 and the second air supply duct a 2. The flow rates of the gas passing through the first gas supply duct a1 and the second gas supply duct a2 can be controlled by notifying the opening degrees of the two flow rate adjustment valves, thereby controlling the concentration of oxygen in the combustion-supporting gas.
The flow regulating unit 4 may further include a gas monitoring element and a central control system, the gas detecting element and the flow regulating valve are respectively connected with the central control system through a signal cable and a control cable, the gas detecting element is used for detecting the concentration of oxygen in the combustion-supporting gas in the coking device 1, and the central control system regulates the opening degree of the flow regulating valve according to the concentration data, so as to control the content of oxygen in the combustion-supporting gas.
The embodiment of the second aspect of the disclosure provides a coking and flue gas treatment method, which is implemented by applying the coking and flue gas treatment system in the embodiment of the first aspect. The coking and flue gas treatment method comprises the following steps:
adjusting the flow rates of the gas passing through the first gas supply duct a1 and the second gas supply duct a 2;
introducing pure oxygen supplied by the oxygen supply unit 2 and air or carbon dioxide or air and carbon dioxide supplied by the air supply unit 3 into the coking device 1;
the coking device 1 is used for coking production under the auxiliary action of combustion-supporting gas obtained by mixing pure oxygen and air, or pure oxygen and carbon dioxide, or pure oxygen, air and carbon dioxide;
providing water vapor, introducing the water vapor, coke oven flue gas discharged by the coking device 1 and pure oxygen supplied by the oxygen supply unit 2 into the gas activation unit 5, and mixing in the gas activation unit 5 to obtain a reaction gas source;
enabling a reaction gas source and a carbonized material to perform an activation reaction in a gas activation unit 5 to obtain mixed gas and activated carbon;
the gas mixture is separated in the gas treatment unit 6 to obtain synthesis gas.
In the embodiment of the disclosure, the flow regulating unit 4 can regulate the concentration of oxygen in the combustion-supporting gas by regulating the flow of the gas, so that the concentration of oxygen in the combustion-supporting gas is greater than that of oxygen in the air, thereby realizing oxygen-enriched combustion, reducing the generation of nitrogen oxides in the flue gas of the coke oven, enriching carbon dioxide in the burnt waste gas, and being beneficial to the capture and utilization of carbon dioxide; carbon dioxide and water vapor in the coke oven flue gas are treated by the gas activation unit 5 to obtain activated carbon and mixed gas, and the gas is separated by the gas treatment unit 6 to obtain synthesis gas, wherein the activated carbon has an adsorption effect and can adsorb harmful gases, and the synthesis gas can be used as a chemical raw material, so that the emission of carbon dioxide is reduced, waste is changed into wealth, low-carbon emission reduction is realized, and green production is realized.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments of the present disclosure are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above description is only for the preferred embodiment of the present disclosure, and is not intended to limit the scope of the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure are included in the scope of protection of the present disclosure.
Claims (9)
1. A coking and flue gas treatment system, comprising:
a coking unit having a gas supply duct and a gas exhaust duct, the gas supply duct comprising a first gas supply duct and a second gas supply duct;
the oxygen supply unit is connected with the first gas supply pipeline;
the air supply unit is connected with the second air supply pipeline;
a flow rate adjusting unit provided on the first air supply duct and the second air supply duct;
the gas activation unit is connected with the exhaust pipeline and the oxygen supply unit; and
a gas treatment unit connected to the gas activation unit through a first recovery conduit;
the oxygen supply unit is configured to supply pure oxygen, and the air supply unit is configured to supply air or carbon dioxide or air and carbon dioxide;
the flow regulating unit is configured to regulate the flow of the gas passing through the first gas supply pipeline and the second gas supply pipeline;
the coking device is configured to utilize pure oxygen and air, or pure oxygen and carbon dioxide, or pure oxygen, air and carbon dioxide to mix to obtain combustion-supporting gas for coking production;
the gas activation unit is configured to mix coke oven flue gas discharged by the exhaust pipeline with pure oxygen and water vapor to obtain a reaction gas source, and the reaction gas source and a carbonized material are subjected to activation reaction to obtain a mixed gas and activated carbon, wherein the mixed gas comprises synthesis gas, waste gas and carbon dioxide;
the gas processing unit is configured to separate the mixed gas to obtain the synthesis gas.
2. The coking and flue gas treatment system of claim 1 further comprising a preheating unit disposed within the coking plant, the preheating unit configured to preheat the combustion gases.
3. The coking and flue gas treatment system of claim 1 wherein the gas treatment unit is further configured to separate the mixed gas to obtain carbon dioxide and a waste gas, respectively, the gas treatment unit is connected to the gas activation unit by a second recovery conduit for passing the waste gas to the gas activation unit, the gas treatment unit is connected to the gas supply unit by a third recovery conduit for passing the carbon dioxide to the gas supply unit.
4. The coking and flue gas treatment system of claim 1 further comprising a water vapor supply unit connected to the gas activation unit.
5. The coking and flue gas treatment system of claim 4 further comprising a flue gas tempering unit, the flue gas temperature regulating and tempering unit comprises a gas detection element, a temperature detection element, a flow regulating valve and a control system, flow regulating valves are arranged on the exhaust pipeline, between the oxygen supply unit and the gas activation unit and between the water vapor supply unit and the gas activation unit, the gas activation unit comprises a premixing chamber, the premixing chamber is used for mixing the coke oven flue gas with pure oxygen and water vapor to obtain a reaction gas source, the gas detection element and the temperature detection element are arranged in the premixing chamber, the gas detection element is used for detecting the concentration of carbon dioxide and water vapor in the reaction gas source, and the temperature detection element is used for detecting the temperature of the reaction gas source in the premixing chamber; the central control system is configured to control the three flow regulating valves to respectively regulate the flow of the coke oven flue gas passing through the exhaust pipeline, the flow of the pure oxygen passing between the oxygen supply unit and the gas activation unit and the flow of the water vapor passing between the water vapor supply unit and the gas activation unit according to the concentrations of the carbon dioxide and the water vapor detected by the gas detection element and the temperature detected by the temperature detection element.
6. The coking and flue gas treatment system of claim 1 further comprising a waste heat recovery device disposed between the gas activation unit and the gas treatment unit, the waste heat recovery device configured to recover heat from the mixture.
7. The coking and flue gas treatment system of claim 6 wherein the waste heat recovery device comprises a waste heat boiler and the coking device is a heat recovery coke oven.
8. The coking and flue gas treatment system of claim 1 wherein the flow regulating unit includes two flow regulating valves disposed on the first and second air supply ducts, respectively.
9. A coking and flue gas treatment process implemented using the coking and flue gas treatment system according to any one of claims 1 to 8, characterized in that it comprises:
adjusting the flow of the gas passing through the first gas supply pipeline and the second gas supply pipeline;
introducing pure oxygen supplied by the oxygen supply unit and air or carbon dioxide or air and carbon dioxide supplied by the air supply unit into the coking device;
the coking device carries out coking production under the auxiliary action of combustion-supporting gas obtained by mixing pure oxygen and air, or pure oxygen and carbon dioxide, or pure oxygen, air and carbon dioxide;
providing water vapor, introducing the water vapor, coke oven flue gas discharged by a coking device and pure oxygen supplied by an oxygen supply unit into a gas activation unit, and mixing the water vapor and the coke oven flue gas in the gas activation unit to obtain a reaction gas source;
enabling a reaction gas source and a carbonized material to perform an activation reaction in a gas activation unit to obtain mixed gas and activated carbon;
and separating the mixed gas in the gas treatment unit to obtain the synthesis gas.
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| CN202111435864.2A CN113845942B (en) | 2021-11-30 | 2021-11-30 | Coking and flue gas treatment system and method |
| PCT/CN2022/131331 WO2023098450A1 (en) | 2021-11-30 | 2022-11-11 | System and method for coking and flue gas treatment |
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| CN202111435864.2A CN113845942B (en) | 2021-11-30 | 2021-11-30 | Coking and flue gas treatment system and method |
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