CN115646134A - Treatment process and system for Volatile Organic Chemicals (VOCs) in unorganized emission flue gas of coke oven - Google Patents
Treatment process and system for Volatile Organic Chemicals (VOCs) in unorganized emission flue gas of coke oven Download PDFInfo
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- CN115646134A CN115646134A CN202211324642.8A CN202211324642A CN115646134A CN 115646134 A CN115646134 A CN 115646134A CN 202211324642 A CN202211324642 A CN 202211324642A CN 115646134 A CN115646134 A CN 115646134A
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Abstract
The invention relates to a treatment process and a treatment system for Volatile Organic Compounds (VOCs) in unorganized discharged flue gas of a coke oven, wherein the system comprises a purification dust remover, a zeolite rotating wheel, an adsorption fan, a chimney, a desorption adjusting valve, a heat exchanger and a desorption fan; the invention fully utilizes the internal facilities of the coking enterprises aiming at the characteristics of coke oven production, integrates the prior coking process system, realizes the high-temperature desorption of the zeolite molecular sieve by utilizing the heat exchange of the waste heat recovered by the ascending pipe and part of the flue gas, and sends the desorbed VOCs to the coke oven heating combustion system along with the flue gas for combustion, thereby saving the gas quantity for heating the coke oven while realizing the discharge of the unorganized escaped flue gas of the coke oven reaching the standard, and having the advantages of simple process flow, low operating cost and the like.
Description
Technical Field
The invention relates to the technical field of coke oven flue gas purification treatment, in particular to a treatment process and a treatment system for VOCs (volatile organic compounds) in unorganized coke oven exhaust gas by fully utilizing waste heat of a riser and a coke oven heating and burning system.
Background
The coking industry plays an important role in national economic development, and a coke oven is a coking production facility and also a main pollution source in the coking industry. At present, china puts forward higher and higher environmental protection requirements for unorganized smoke dissipation of coke ovens, and partial enterprises have already developed exploration of covering and sealing production areas of the coke ovens (such as 'a coke oven integrally-sealed greenhouse' disclosed in Chinese patent application with the publication number of CN 109488058A). After the coke oven is wholly sealed, smoke dust, waste heat and other substances in the coke oven greenhouse need to be effectively treated. In the production process of the coke oven at present, flue gas containing dust, VOCs gas and the like can be continuously or discontinuously generated at positions such as a coke side oven door of a coke oven machine, the bottom of an ascending pipe, a coal charging hole at the top of the coke oven, a fire observation hole and the like, and a technical means which is safe, efficient, stable and low in operation cost is urgently needed for the purification treatment of the flue gas.
At the present stage, the mainstream treatment mode of the flue gas containing the VOCs is a zeolite rotating wheel and heat accumulating type incineration process, and the principle of the process is that the flue gas enters a zeolite molecular sieve rotating wheel system after being pretreated to remove particles such as dust and the like, the flue gas is subjected to adsorption-desorption process by the zeolite molecular sieve rotating wheel, the flue gas containing the VOCs with large air quantity and low concentration is concentrated into the flue gas with small air quantity and high concentration, and the concentrated flue gas enters the heat accumulating type incinerator for combustion and purification. For example, "a method for treating VOC exhaust gas from a hazardous waste incineration plant" disclosed in chinese patent application publication No. CN113648786A, and "an energy-saving zeolite wheel and RTO organic exhaust gas treatment system" disclosed in chinese patent application publication No. CN 114028907A. In the above treatment process or system, when the average concentration of the concentrated VOCs-containing flue gas is not high (lower than 7 g/m) 3 ) Continuous combustion of the gas is required to maintain the incinerator temperature. The content of VOCs in the unorganized discharged flue gas of the coke oven is low, so the treatment method has the advantages of complex process flow, large gas consumption and high operating cost.
Disclosure of Invention
The invention provides a process and a system for treating Volatile Organic Compounds (VOCs) in unorganized emission flue gas of a coke oven, aiming at the characteristics of coke oven production, internal facilities of a coking enterprise are fully utilized, the existing coking process system is integrated, high-temperature desorption of a zeolite molecular sieve is realized by heat exchange between waste heat recovered by an ascending pipe and a part of flue gas, the desorbed VOCs are sent to a coke oven heating combustion system along with the flue gas for combustion, the gas quantity for heating the coke oven is saved while the unorganized emission flue gas of the coke oven is discharged up to the standard, and the process has the advantages of simple process flow, low operation cost and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
a process for treating VOCs in unorganized emission flue gas of a coke oven comprises the steps of collecting VOCs-containing flue gas inorganized emission in a coke oven greenhouse by an air suction cover in a coke oven production process, then sending the flue gas to a dust purification and removal device, and removing dust particles after filtering; the filtered flue gas is conveyed to a zeolite rotating wheel in two paths, wherein most of the flue gas enters an adsorption area of the zeolite rotating wheel through a flue gas pipeline, and is subjected to VOCs adsorption and purification by a zeolite molecular sieve and then is conveyed to a chimney for emission by an adsorption fan; a small part of flue gas passes through another path of flue gas pipeline, the flow is regulated by a desorption regulating valve and then enters a cooling area of the zeolite rotating wheel, the heated flue gas enters a heat exchanger to exchange heat with a high-temperature heat exchange medium sent by a coke oven riser waste heat utilization system, the temperature is raised to more than 200 ℃, and then the flue gas enters a desorption area of the zeolite rotating wheel to carry out high-temperature desorption on the zeolite molecular sieve; under the action of the desorption fan, the flue gas and the desorbed VOCs enter a coke oven heating combustion system together for combustion.
Furthermore, the high-temperature heat exchange medium of the coke oven riser waste heat utilization system is steam or heat conduction oil.
Furthermore, the two flue gas pipelines are respectively provided with flue gas sensors at the downstream of the purification dust remover, the upstream of the chimney and the upstream of the desorption fan, and the flue gas sensors are used for monitoring the temperature, the pressure, the flow and the concentration of VOCs of the flue gas at corresponding positions.
A system for treating VOCs in the unorganized emission flue gas of a coke oven comprises a purification dust remover, a zeolite rotating wheel, an adsorption fan, a chimney, a desorption adjusting valve, a heat exchanger and a desorption fan; the zeolite runner is provided with an adsorption area, a desorption area and a cooling area; a smoke inlet of the purification dust remover is connected with an air suction cover which is arranged in the coke oven greenhouse and used for collecting the inorganically discharged smoke, a smoke outlet of the purification dust remover is connected with an inlet of a smoke pipeline I and an inlet of a smoke pipeline II through a smoke outlet header pipe, an outlet of the smoke pipeline I is connected with a smoke inlet of a zeolite rotating wheel adsorption area, a smoke outlet of the zeolite rotating wheel adsorption area is connected with a chimney through a smoke outlet pipeline I, and an adsorption fan is arranged on the smoke outlet pipeline I; a desorption adjusting valve is arranged on the second flue gas pipeline, the outlet of the second flue gas pipeline is connected with the flue gas inlet of the zeolite rotating wheel cooling area, the flue gas outlet of the zeolite rotating wheel cooling area is connected with the first heat exchange medium inlet of the heat exchanger through a pipeline, the first heat exchange medium outlet of the heat exchanger is connected with the flue gas inlet of the zeolite rotating wheel desorption area through a pipeline, the flue gas outlet of the zeolite rotating wheel desorption area is connected with the flue gas inlet of the coke oven heating combustion system through a second flue gas outlet pipeline, and a desorption fan is arranged on the second flue gas outlet pipeline; and a second heat exchange medium inlet of the heat exchanger is connected with a heat exchange medium outlet pipeline of the coke oven ascending pipe waste heat utilization system.
Further, the system for treating the VOCs in the unorganized discharged flue gas of the coke oven also comprises a plurality of flue gas sensors; the flue gas sensor comprises a flue gas sensor arranged on a downstream flue gas outlet main pipe of the purification dust remover, a flue gas sensor arranged on a flue gas outlet pipeline I on the upstream of the chimney and a flue gas sensor arranged on a flue gas outlet pipeline II on the upstream of the desorption fan.
Further, the flue gas sensor comprises one or more of a temperature sensor, a pressure sensor, a flow sensor and a VOCs concentration sensor.
Further, the purification dust remover is a multi-stage filter or a bag type dust remover.
Further, the heat exchanger is a gas-gas dividing wall type heat exchanger or a gas-liquid dividing wall type heat exchanger.
Compared with the prior art, the invention has the beneficial effects that:
1) According to the characteristics of coke oven production, internal facilities of a coking enterprise are fully utilized, the existing coking process system is integrated, the waste heat recovered by the ascending pipe is utilized to exchange heat with part of flue gas to realize high-temperature desorption of the zeolite molecular sieve, and the desorbed VOCs are sent to a coke oven heating combustion system along with the flue gas to be combusted, so that the up-to-standard emission of the unorganized escaped flue gas of the coke oven is realized;
2) The system has simple and compact structure and convenient operation, and saves materials and floor area;
2) Has the advantages of simple process flow, low operating cost and the like.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a VOCs treatment system for inorganically discharged flue gas of a coke oven.
Description of reference numerals:
in the figure: 1. purification dust remover 2, zeolite runner 3, adsorption fan 4, chimney 5, desorption regulating valve 6, heat exchanger 7, desorption fan 8 smoke sensor
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The following further describes embodiments of the present invention in conjunction with the attached figures:
as shown in figure 1, in the treatment process of VOCs in the unorganized emission flue gas of the coke oven, in the production process of the coke oven, VOCs-containing flue gas which is inorganized emission in a greenhouse of the coke oven is collected by an air suction cover and then is sent to a dust purification and removal device 1, and dust particles are removed after filtration; the filtered flue gas is conveyed to a zeolite rotating wheel 2 in two paths, wherein most of the flue gas enters an adsorption area of the zeolite rotating wheel 2 through a flue gas pipeline, is subjected to VOCs adsorption and purification by a zeolite molecular sieve and then is pressurized and conveyed to a chimney 4 by an adsorption fan 3 for emission; a small part of flue gas enters a cooling area of the zeolite rotating wheel 2 after the flow of the flue gas is regulated by a desorption regulating valve 5 through another flue gas pipeline, the heated flue gas enters a heat exchanger 6 to exchange heat with a high-temperature heat exchange medium sent by a coke oven riser waste heat utilization system, the temperature is raised to be more than 200 ℃, and then the flue gas enters a desorption area of the zeolite rotating wheel 2 to perform high-temperature desorption on the zeolite molecular sieve; under the action of the desorption fan 7, the flue gas and the desorbed VOCs enter a coke oven heating combustion system together for combustion.
Furthermore, the high-temperature heat exchange medium of the coke oven ascending pipe waste heat utilization system is steam or heat conduction oil.
Furthermore, the two flue gas pipelines are respectively provided with a flue gas sensor 8 at the downstream of the purification dust remover 1, at the upstream of the chimney 4 and at the upstream of the desorption fan 7, and are used for monitoring the temperature, pressure, flow and VOCs concentration of the flue gas at the corresponding part.
The invention relates to a system for treating Volatile Organic Compounds (VOCs) in unorganized emission flue gas of a coke oven, which comprises a purification dust remover 1, a zeolite rotating wheel 2, an adsorption fan 3, a chimney 4, a desorption adjusting valve 5, a heat exchanger 6 and a desorption fan 7; the zeolite runner 2 is provided with an adsorption area, a desorption area and a cooling area; a flue gas inlet of the purification dust remover 1 is connected with a gas suction cover which is arranged in a coke oven greenhouse and used for collecting inorganically discharged flue gas, a flue gas outlet of the purification dust remover 1 is connected with an inlet of a flue gas pipeline I and an inlet of a flue gas pipeline II through a flue gas outlet header pipe, an outlet of the flue gas pipeline I is connected with a flue gas inlet of an adsorption area of the zeolite rotating wheel 2, a flue gas outlet of the adsorption area of the zeolite rotating wheel 2 is connected with a chimney 4 through a flue gas outlet pipeline I, and an adsorption fan 3 is arranged on the flue gas outlet pipeline I; a desorption adjusting valve 5 is arranged on the second flue gas pipeline, the outlet of the second flue gas pipeline is connected with the flue gas inlet of the cooling area of the zeolite rotating wheel 2, the flue gas outlet of the cooling area of the zeolite rotating wheel 2 is connected with the first heat exchange medium inlet of the heat exchanger 6 through a pipeline, the first heat exchange medium outlet of the heat exchanger 6 is connected with the flue gas inlet of the desorption area of the zeolite rotating wheel 2 through a pipeline, the flue gas outlet of the desorption area of the zeolite rotating wheel 2 is connected with the flue gas inlet of the coke oven heating combustion system through a flue gas outlet pipeline II, and a desorption fan 7 is arranged on the second flue gas outlet pipeline; and a second heat exchange medium inlet of the heat exchanger 6 is connected with a heat exchange medium outlet pipeline of the coke oven ascending pipe waste heat utilization system.
Furthermore, the system for treating the Volatile Organic Compounds (VOCs) in the unorganized discharged flue gas of the coke oven also comprises a plurality of flue gas sensors 8; the flue gas sensor comprises a flue gas sensor 8 arranged on a downstream flue gas outlet main pipe of the purification dust remover, a flue gas sensor 8 arranged on a flue gas outlet pipeline I on the upstream of the chimney, and a flue gas sensor 8 arranged on a flue gas outlet pipeline II on the upstream of the desorption fan.
Further, the flue gas sensor 8 comprises one or more of a temperature sensor, a pressure sensor, a flow sensor and a VOCs concentration sensor.
Further, the purifying dust remover 1 is a multi-stage filter or a bag type dust remover.
Further, the heat exchanger 6 is a gas-gas dividing wall type heat exchanger or a gas-liquid dividing wall type heat exchanger.
The invention relates to a process and a system for treating Volatile Organic Compounds (VOCs) in unorganized emission flue gas of a coke oven, wherein the equipment comprises a purification dust remover 1, a zeolite rotating wheel 2, an adsorption fan 3, a chimney 4, a desorption adjusting valve 5, a heat exchanger 6, a desorption fan 7, a flue gas sensor 8 and the like.
The purification dust remover 1 receives VOCs-containing flue gas discharged disorderly in a coke oven greenhouse through a flue gas pipeline, the zeolite rotating wheel 2 is provided with an adsorption area, a desorption area and a cooling area, a desorption adjusting valve is arranged on the flue gas pipeline between the purification dust remover and the zeolite rotating wheel, an adsorption fan 3 and a chimney 4 are arranged at the lower part of the adsorption area of the zeolite rotating wheel 2, the desorption area and the cooling area of the zeolite rotating wheel 2 are respectively connected with a heat exchanger 6, a desorption fan 7 is arranged at the lower part of the desorption area of the zeolite rotating wheel 2, a high-temperature side heat exchange medium channel of the heat exchanger 6 is connected with a coke oven riser waste heat utilization system, and steam or heat conduction oil generated by the heat exchange system exchanges heat with the flue gas. And a low-temperature side heat exchange medium channel of the heat exchanger 6 is used for flue gas to enter and exit. The flue gas sensor 8 is respectively arranged on the flue gas pipelines at the upstream of the zeolite rotating wheel 2, the downstream of the adsorption fan 3 and the upstream of the desorption fan 7.
The cleaning dust collector 1 is preferably a multistage filter or a bag type dust collector.
The heat exchanger 6 is preferably a gas-gas dividing wall type heat exchanger or a gas-liquid dividing wall type heat exchanger.
And the 7-desorption fan is used as a power source and used for sucking part of the smoke to be purified to cool and desorb the zeolite molecular sieve, sending the concentrated smoke containing VOCs into a coke oven heating and burning system, and realizing smoke treatment through burning.
The flue gas sensor 8 includes, but is not limited to, a temperature sensor, a pressure sensor, a flow sensor, and a VOCs concentration sensor.
When the flue gas treatment capacity is large, the VOCs treatment of the unorganized flue gas discharged by the coke oven can be used as a plurality of functional units which are connected in parallel, so that the flue gas treatment requirement is met.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A process for treating VOCs in unorganized emission flue gas of a coke oven is characterized in that in the production process of the coke oven, VOCs-containing flue gas which is inorganized emission in a greenhouse of the coke oven is collected by an air suction cover and then sent to a purification dust remover, and dust particles are removed after filtration; the filtered flue gas is conveyed to a zeolite rotating wheel in two paths, wherein most flue gas enters an adsorption zone of the zeolite rotating wheel through a flue gas pipeline, and is subjected to VOCs adsorption and purification by a zeolite molecular sieve and then is pressurized and conveyed to a chimney by an adsorption fan for emission; a small part of flue gas passes through another path of flue gas pipeline, the flow is regulated by a desorption regulating valve and then enters a cooling area of the zeolite rotating wheel, the heated flue gas enters a heat exchanger to exchange heat with a high-temperature heat exchange medium sent by a coke oven riser waste heat utilization system, the temperature is raised to more than 200 ℃, and then the flue gas enters a desorption area of the zeolite rotating wheel to carry out high-temperature desorption on the zeolite molecular sieve; under the action of the desorption fan, the flue gas and the desorbed VOCs enter a coke oven heating combustion system together for combustion.
2. The treatment process for Volatile Organic Compounds (VOCs) in the inorganically discharged flue gas of the coke oven according to claim 1, wherein a high-temperature heat exchange medium of the coke oven ascension pipe waste heat utilization system is steam or heat conduction oil.
3. The treatment process of the Volatile Organic Compounds (VOCs) in the inorganically discharged flue gas of the coke oven according to claim 1, wherein the two flue gas pipelines are respectively provided with a flue gas sensor at the downstream of the dust remover, at the upstream of the chimney and at the upstream of the desorption fan, and the flue gas sensors are used for monitoring the temperature, the pressure, the flow and the concentration of the VOCs of the flue gas at the corresponding positions.
4. The treatment system for VOCs in the unorganized emission flue gas of the coke oven for realizing the process according to any one of claims 1 to 3, which is characterized by comprising a purification dust remover, a zeolite rotating wheel, an adsorption fan, a chimney, a desorption adjusting valve, a heat exchanger and a desorption fan; the zeolite runner is provided with an adsorption zone, a desorption zone and a cooling zone; a flue gas inlet of the purification dust remover is connected with a gas suction cover which is arranged in the coke oven greenhouse and is used for collecting the inorganically discharged flue gas, a flue gas outlet of the purification dust remover is connected with an inlet of a flue gas pipeline I and an inlet of a flue gas pipeline II through a flue gas outlet main pipe, an outlet of the flue gas pipeline I is connected with a flue gas inlet of a zeolite rotating wheel adsorption area, a flue gas outlet of the zeolite rotating wheel adsorption area is connected with a chimney through a flue gas outlet pipeline I, and an adsorption fan is arranged on the flue gas outlet pipeline I; a desorption adjusting valve is arranged on the second flue gas pipeline, the outlet of the second flue gas pipeline is connected with the flue gas inlet of the zeolite rotating wheel cooling area, the flue gas outlet of the zeolite rotating wheel cooling area is connected with the first heat exchange medium inlet of the heat exchanger through a pipeline, the first heat exchange medium outlet of the heat exchanger is connected with the flue gas inlet of the zeolite rotating wheel desorption area through a pipeline, the flue gas outlet of the zeolite rotating wheel desorption area is connected with the flue gas inlet of the coke oven heating combustion system through a second flue gas outlet pipeline, and a desorption fan is arranged on the second flue gas outlet pipeline; and a second heat exchange medium inlet of the heat exchanger is connected with a heat exchange medium outlet pipeline of the coke oven ascending pipe waste heat utilization system.
5. The coke oven unstructured emission flue gas VOCs treatment system of claim 4, further comprising a plurality of flue gas sensors; the flue gas sensor comprises a flue gas sensor arranged on a downstream flue gas outlet main pipe of the purification dust remover, a flue gas sensor arranged on a flue gas outlet pipeline I on the upstream of the chimney and a flue gas sensor arranged on a flue gas outlet pipeline II on the upstream of the desorption fan.
6. The coke oven unstructured emission flue gas VOCs treatment system of claim 5, wherein the flue gas sensors comprise one or more of temperature sensors, pressure sensors, flow sensors, VOCs concentration sensors.
7. The coke oven unstructured emission flue gas VOCs treatment system of claim 4, wherein the purification dust collector is a multi-stage filter or a bag type dust collector.
8. The system of claim 4, wherein the heat exchanger is a gas-gas dividing wall type heat exchanger or a gas-liquid dividing wall type heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211324642.8A CN115646134A (en) | 2022-10-27 | 2022-10-27 | Treatment process and system for Volatile Organic Chemicals (VOCs) in unorganized emission flue gas of coke oven |
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| CN202211324642.8A CN115646134A (en) | 2022-10-27 | 2022-10-27 | Treatment process and system for Volatile Organic Chemicals (VOCs) in unorganized emission flue gas of coke oven |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116571058A (en) * | 2023-07-15 | 2023-08-11 | 中矿和创环境科技(山东)有限公司 | High concentrated gas cylinder type zeolite rotating wheel device |
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2022
- 2022-10-27 CN CN202211324642.8A patent/CN115646134A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116571058A (en) * | 2023-07-15 | 2023-08-11 | 中矿和创环境科技(山东)有限公司 | High concentrated gas cylinder type zeolite rotating wheel device |
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