A step-condensation demisting and dust removal system and method for coke oven gas

Abstract

The present invention relates to the field of environmental protection treatment technology, and discloses a step-condensation demisting and dust removal system and method for coke oven gas. The system comprises: a tower shell, a circulating cooling system, and a condenser tube demisting and dust removal device, a condenser plate demisting and dust removal device, and a condenser fiber demisting and dust removal device arranged inside the tower shell; the condenser tube demisting and dust removal device is located on the upper side of the gas inlet; the condenser plate demisting and dust removal device is located on the upper side of the condenser tube demisting and dust removal device; the condenser fiber demisting and dust removal device is located between the condenser plate demisting and dust removal device and the gas outlet. A step-condensation demisting and dust removal device is used to remove dust-containing tar droplets of different particle sizes in the coke oven gas in stages, thereby reducing the tar mist and dust content in the coke oven gas; the demisting and dust removal devices at various levels are connected to the cooling circulation system, thereby strengthening the collision and condensation of the demisting and dust removal devices at various levels and the condensation of the tar mist, thereby improving the demisting and dust removal efficiency of the system, and reducing the content of tar droplets and dust in the system.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection treatment, and in particular to a step-condensation demisting and dust removal system and method for coke oven gas. Background Art

[0002] Coke oven gas is rich in carbon and hydrogen compounds and can be used as a raw material for producing high value-added chemical products. In the coking industry, after pre-treatment such as primary cooling, electric oil capture, and benzene removal, the gas still contains tar droplets, dust and other substances. These impurities affect the normal operation of the compressor and are not conducive to the stability of the subsequent process system.

[0003] In order to extend the inspection and maintenance cycle of the compressor, most coking enterprises add an activated carbon adsorption tower in front of the compressor, which undoubtedly increases the pressure drop of the system, and the activated carbon needs to be regenerated and replaced regularly, increasing the operating cost. In summer, when the coke oven gas working conditions are bad, some coking enterprises' gas compressors need to be switched and repaired after running for a week, which brings great pressure to the normal production and operation of the enterprise. Therefore, it is urgent to design and produce a cascade demisting and dust removal system with high efficiency, large operating flexibility, low pressure drop, and suitable for coke oven gas purification to meet the production efficiency and environmental protection needs of the enterprise. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a cascade condensation demisting and dust removal system and method for coke oven gas, which adopts a cascade demisting and dust removal device to gradedly remove dust droplets of different particle sizes in the coke oven gas, thereby reducing the tar droplets and dust content in the coke oven gas; the demisting and dust removal devices at each stage are connected to a cooling circulation system to strengthen the collision and agglomeration of the demisting and dust removal devices at each stage and the condensation of tar droplets, thereby improving the demisting and dust removal efficiency of the system, extending the service life of subsequent compressors, and reducing the poisoning effect on subsequent refined catalysts.

[0005] The technical solution provided by the present invention is as follows:

[0006] A step-condensation demisting and dust removal system for coke oven gas, comprising:

[0007] A tower shell, a circulating cooling system, and a condenser tube type demisting and dust collector, a condenser plate type demisting and dust collector, and a condenser fiber demisting and dust collector arranged inside the tower shell;

[0008] A gas inlet is provided at the lower end of the tower shell, a gas passage is provided inside the tower shell, and a gas outlet is provided at the upper end of the tower shell;

[0009] The condenser type mist remover is located on the upper side of the coal gas inlet, and is used to reduce the content of dust and tar droplets of preset diameters, and to make the gas flow field evenly distributed;

[0010] The condensing plate type demisting and dust collector is located on the upper side of the condensing tube type demisting and dust collector, and is used to remove dust and tar droplets larger than 5 μm in the coal gas;

[0011] The condensing fiber demisting and dust collector is located between the condensing plate demisting and dust collector and the coal gas outlet, and is used to remove dust and tar droplets below 5 μm in the coal gas;

[0012] The circulating cooling system is respectively connected to the condenser tube type demisting and dust collector, the condenser plate type demisting and dust collector, and the condenser fiber demisting and dust collector, and is used for cooling the coal gas and precipitating high-viscosity components such as tar.

[0013] In this technical solution, a cascade demisting and dust collector system is used: the inertial collision and condensation of the condensing tube demisting and dust collector are used to remove large-size dust-containing tar droplets; the collision and condensation of the condensing plate demisting and dust collector are used to remove dust and tar droplets above 5μm in the coal gas; the inertial collision, direct interception, Brownian motion, and condensation of droplets and tar droplets of the condensing fiber demisting and dust collector are used to remove dust and tar droplets below 5μm in the coal gas. The system selects demisting and dust collectors with different working principles for tar droplets and dust of different particle sizes, which can improve the demisting and dust removal effect of the entire system, enhance the system's operational reliability and operational flexibility, reduce investment costs, and minimize system pressure drop, saving operating costs. At the same time, a circulating cooling system is adopted to utilize cooling medium to cool down the condenser tube type mist collector, condenser plate type mist collector and condenser fiber mist collector. Through condensation, the mist removal efficiency of the condenser tube type mist collector, condenser plate type mist collector and condenser fiber mist collector is improved, further reducing the dust and tar droplet content in the coal gas, extending the service life of the compressor and reducing the poisoning effect on the subsequent refined catalyst.

[0014] Further preferably, the condenser type demisting and dust collecting device comprises a layer of a single condenser type demisting and dust collecting device tube group or at least two layers of staggered arranged single condenser type demisting and dust collecting device tube groups;

[0015] The single condenser type demisting and dust collecting pipe group comprises a plurality of single condenser type demisting and dust collecting pipes arranged at a preset distance, and the single condenser type demisting and dust collecting pipes are provided with a condenser type demisting and dust collecting water inlet end and a condenser type demisting and dust collecting water outlet end, the condenser type demisting and dust collecting water inlet end is connected to the water outlet end of the circulating cooling system via a first pipeline, and the condenser type demisting and dust collecting water outlet end is connected to the water inlet end of the circulating cooling system via a second pipeline.

[0016] Further preferably, the single condenser tube type mist collector is in the shape of a hollow inverted water drop, comprising a first side wall, a second side wall and an arc-shaped wall connected in sequence, and the angle between the first side wall and the second side wall is 60°-120°;

[0017] The outer wall of the single condenser tube type demisting and dust collecting device tube is coated with an oil-repellent heat-conducting material.

[0018] In this technical solution, the interception of dust and tar droplets of different particle sizes is achieved by controlling the distance between two adjacent single condenser tube demisting and dust collecting tubes; the angle of the single condenser tube demisting and dust collecting tube is a hollow inverted water drop shape, 60-120°. When the airflow passes through the angle, the large particles of tar droplets and dust in the coke oven gas are captured due to inertial collision, and the spacing between the tubes is continuously reduced. At the minimum spacing, the gas velocity is the maximum, and the dust is not easy to bridge between the tubes. Small diameter oil-repellent heat-conducting material tubes are used to prevent tar dust from depositing on the outer wall, while enhancing the heat transfer efficiency and enhancing the removal of tar droplets from the gas.

[0019] Further preferably, the condensing plate type mist remover and dust collector comprises at least one layer of plate group and blade group;

[0020] The plate group blade group includes a plurality of plate group blades arranged side by side, and the plate group blades include a plurality of blade plates connected in front of each other, and two adjacent blade plates are arranged at an angle.

[0021] Further preferably, the distance between two adjacent blades of the plate set is 10mm-35mm;

[0022] The included angle between two adjacent blade plates is 70°-120°;

[0023] The outer walls of the plate group blades are coated with an oil-repellent heat-conducting material.

[0024] Further preferably, the condensing plate type mist remover and dust collector further comprises:

[0025] A plurality of condensing plate type demisting and dust collecting cooling pipes, wherein the condensing plate type demisting and dust collecting cooling pipes are arranged at the connection between two adjacent blade plates, each of the condensing plate type demisting and dust collecting cooling pipes is provided with a barb, and the barb is located on a side of the condensing plate type demisting and dust collecting cooling pipe away from the plate group blades, and the outer wall of the condensing plate type demisting and dust collecting cooling pipe is coated with an oil-repellent heat-conducting material;

[0026] The condensing plate type demisting and dust collector cooling pipe is provided with a condensing plate type demisting and dust collector water inlet end and a condensing plate type demisting and dust collector water outlet end. The condensing plate type demisting and dust collector water inlet end is connected to the circulating cooling system water outlet end via a third pipeline, and the condensing plate type demisting and dust collector water outlet end is connected to the circulating cooling system water inlet end via a fourth pipeline.

[0027] Further preferably, the condensing fiber demisting and dust collector comprises several layers of fiber filament groups arranged side by side, the fiber filament groups comprise several staggered fiber filaments, a condensing fiber demisting and dust collector cooling pipe is wound in each of the fiber filament groups, the condensing fiber demisting and dust collector cooling pipe is provided with a condensing fiber demisting and dust collector water inlet end and a condensing fiber demisting and dust collector water outlet end, the condensing fiber demisting and dust collector water inlet end is connected to the water outlet end of the circulating cooling system via a fifth pipeline, and the condensing fiber demisting and dust collector water outlet end is connected to the water inlet end of the circulating cooling system via a sixth pipeline.

[0028] Further preferably, the diameter of the fiber filament is 5 μm-100 μm;

[0029] The outer side wall of the fiber filament is coated with an oil-repellent heat-conducting material;

[0030] The fiber filament is provided with a first spiral protrusion.

[0031] Further preferably, the outer side wall of the cooling pipe of the condensing fiber demisting and dust collecting device is coated with an oil-repellent heat-conducting material;

[0032] A second spiral protrusion is provided on the cooling pipe of the condensing fiber demisting and dust removing device.

[0033] Another technical solution provided by the present invention is as follows:

[0034] A method for step-condensation demisting and dust removal of coke oven gas, using any one of the above-mentioned step-condensation demisting and dust removal systems for coke oven gas, comprises the following steps:

[0035] Untreated coke oven gas enters the tower through the gas inlet of the tower shell, and the dust and tar droplets of preset diameter in the coke oven gas are pre-treated by the condenser tube type mist remover;

[0036] The pre-treated coal gas rises and is initially treated by a condensing plate type mist remover to remove dust and tar droplets larger than 5μm in the coal gas;

[0037] The initially treated coal gas rises and is treated again by the condensing fiber mist remover to remove dust and tar droplets below 5μm in the coal gas;

[0038] The refrigerant cools down the condensing tube type mist collector, the condensing plate type mist collector, and the condensing fiber mist collector respectively through the circulating cooling system.

[0039] Compared with the prior art, the step-condensation demisting and dust removal system and method of the coke oven gas of the present invention has the following beneficial effects:

[0040] In the present invention, condenser tube type demisting and dust collecting devices, condenser plate type demisting and dust collecting devices, condenser fiber demisting and dust collecting devices, and circulating cooling systems are arranged in stages in the tower, and a stepped demisting and dust collecting device is adopted to remove dust droplets of different particle sizes in the coke oven gas in stages, thereby reducing the tar droplets and dust content in the coke oven gas; the demisting and dust collecting devices at each stage are connected to the cooling circulation system to strengthen the collision, condensation and coagulation effects of the demisting and dust collecting devices at each stage, thereby improving the demisting and dust collecting efficiency of the system, reducing the tar droplets in the coke oven gas, extending the service life of the subsequent compressor, and reducing the poisoning effect on the subsequent refined catalyst. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and their implementation methods.

[0042] Figure 1 It is a structural schematic diagram of a step-condensation demisting and dust removal system for coke oven gas according to a specific embodiment of the present invention;

[0043] Figure 2 It is a structural schematic diagram of a single condenser tube type mist remover and dust collector according to another specific embodiment of the present invention;

[0044] Figure 3 It is a partial structural schematic diagram of a condensing plate type mist remover and dust collector according to another specific embodiment of the present invention;

[0045] Figure 4 It is a schematic structural diagram of a condensing fiber mist remover and dust collector according to another specific embodiment of the present invention.

[0046] Description of Figure Numbers:

[0047] 1. Tower shell, 11. Gas inlet, 12. Gas outlet, 2. Condenser tube type mist collector, 21. Single condenser tube type mist collector, 22. Water outlet of condenser tube type mist collector, 23. Water inlet of condenser tube type mist collector, 3. Condenser plate type mist collector, 31. Plate group blades, 32. Water outlet of condenser plate type mist collector, 33. Water inlet of condenser plate type mist collector, 34. Cooling pipe of condenser plate type mist collector, 4. Condenser fiber mist collector, 41. Fiber filaments, 42. Water outlet of condenser fiber mist collector, 43. Water inlet of condenser fiber mist collector, 44. Cooling pipe of condenser fiber mist collector, 5. Circulating cooling system, 51. First pipeline of circulating cooling system, 52. Second pipeline of circulating cooling system. DETAILED DESCRIPTION

[0048] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0049] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0050] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0051] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0052] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of the various components of the present invention are not absolute but relative. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, the indications of these directions also change accordingly.

[0053] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0055] In one embodiment, if Figure 1As shown, this embodiment provides a step-wise condensation demisting and dust removal system for coke oven gas, comprising: a tower shell 1, a circulating cooling system 5, and a condenser tube demisting and dust collector 2, a condenser plate demisting and dust collector 3, and a condenser fiber demisting and dust collector 4 arranged inside the tower shell 1. A gas inlet 11 is provided at the lower end of the tower shell 1, a gas channel is provided inside the tower shell 1, and a gas outlet 12 is provided at the upper end of the tower shell 1. The gas inlet 11 is connected to the gas outlet 12 through the gas channel. The condenser tube demisting and dust collector 2 is located on the upper side of the gas inlet 11, and is used to reduce the content of large-particle dust and tar droplets, and to make the gas flow field uniform. The condenser plate demisting and dust collector 3 is located on the upper side of the condenser tube demisting and dust collector 2, and is used to remove dust and tar droplets above 5μm in the gas. The condensing fiber demisting dust collector 4 is located between the condensing plate demisting dust collector 3 and the coal gas outlet 12, and is used to remove dust and tar droplets below 5 μm in the coal gas. The circulating cooling system 5 is respectively connected to the condensing tube demisting dust collector 2, the condensing plate demisting dust collector 3, and the condensing fiber demisting dust collector 4 for cooling.

[0056] In this embodiment, the cascade condensation demisting and dust removal system for coke oven gas adopts a cascade demisting and dust removal system: the condensation tube demisting and dust removal system is used to remove large-size dust droplets; the condensation plate demisting and dust removal system is used to remove dust and tar droplets above 5μm in the gas by collision, condensation and condensation; the condensation fiber demisting and dust removal system is used to remove dust and tar droplets below 5μm in the gas by inertial collision, direct interception, Brownian motion, and tar droplet condensation. The system selects demisting and dust removal systems with different working principles for tar droplets and dust of different particle sizes, which can improve the demisting and dust removal effect of the entire system, enhance the system's operational reliability and operational flexibility, reduce investment costs, and minimize system pressure drop, saving operating costs. At the same time, a circulating cooling system is adopted to utilize cooling medium to cool down the condenser tube type mist collector, condenser plate type mist collector and condenser fiber mist collector. Through condensation, the mist removal efficiency of the condenser tube type mist collector, condenser plate type mist collector and condenser fiber mist collector is improved, further reducing the dust and tar droplet content in the coal gas.

[0057] In another embodiment, if Figure 1 , Figure 2As shown, on the basis of the above embodiment, the circulating cooling system 5 is further provided with a first circulating cooling system pipeline 51 and a second circulating cooling system pipeline 52. The condenser type demisting dust collector 2 includes a single condenser type demisting dust collector pipe group or at least two layers of staggered single condenser type demisting dust collector pipe groups. The single condenser type demisting dust collector pipe group includes a plurality of single condenser type demisting dust collector pipes 21 arranged at a preset distance, and the single condenser type demisting dust collector pipe 21 is provided with a condenser type demisting dust collector water inlet end 22 and a condenser type demisting dust collector water outlet end 23, and the condenser type demisting dust collector water inlet end 22 is connected to the water outlet end of the circulating cooling system 5 through the first circulating cooling system pipeline 51, and the condenser type demisting dust collector water outlet end 23 is connected to the water inlet end of the circulating cooling system 5 through the second circulating cooling system pipeline 52.

[0058] Specifically, Figure 2 As shown, the single condenser tube type demisting and dust collector tube 21 is a hollow inverted water drop shape, which includes a first side wall, a second side wall and an arc-shaped wall which are connected in sequence, and the angle between the first side wall and the second side wall is 60°-120°. The outer wall of the single condenser tube type demisting and dust collector tube 21 is coated with an oil-repellent heat-conductive material.

[0059] Preferably, the condenser tube type mist remover 2 has 1-4 layers, and each layer is staggered to increase the uniform distribution effect of the coke oven gas in the tower and improve the mist removal efficiency of the system. The angle of a single condenser tube type mist remover 21 is a hollow inverted water droplet shape, which is 60°-120°. When the airflow passes through the angle, the large particles of tar droplets and dust in the coke oven gas are captured due to inertial collision, and the distance between the tubes is continuously reduced. At the minimum distance, the gas velocity is the maximum, and the dust is not easy to bridge between the tubes. The single condenser tube type mist collector 21 is hollow, and the water inlet end 23 of the condenser tube type mist collector is connected to the water outlet end of the circulating cooling system 5 through the first pipeline 51 of the circulating cooling system, and the water outlet end 22 of the condenser tube type mist collector is connected to the water inlet end of the circulating cooling system 5 through the second pipeline 52 of the circulating cooling system. The cooling medium flows in the single condenser tube type mist collector 21, which reduces the surface temperature of the single condenser tube type mist collector 21, and the tar droplets condense on the surface, further reducing large particles of tar droplets and dust. The single tube type mist collector 21 is coated with oil-repellent heat-conductive material to improve the heat exchange efficiency, enhance the condensation effect, and reduce the bridging of dust on the surface. The tar droplets and dust content are greatly reduced, reducing the load and system pressure drop of the downstream high-precision special plate group mist collector and condensation fiber mist collector.

[0060] In another embodiment, if Figure 1 , Figure 3As shown, on the basis of the above embodiment, the circulating cooling system 5 is further provided with a first circulating cooling system pipeline 51 and a second circulating cooling system pipeline 52. The condensing plate type demisting dust collector 3 includes at least one layer of plate group blade group, the plate group blade group includes a plurality of plate group blades 31 arranged side by side, the plate group blades 31 include a plurality of first connected blade plates, two adjacent blade plates are arranged at an angle, and the outer wall of the plate group blades 31 is coated with an oil-repellent heat-conducting material. The condensing plate type demisting dust collector is also provided with a plurality of condensing plate type demisting dust collector cooling pipes 34, the condensing plate type demisting dust collector cooling pipes 34 are arranged at the connection between two adjacent blade plates, each condensing plate type demisting dust collector cooling pipe 34 is provided with a barb, the barb is located on the side of the condensing plate type demisting dust collector cooling pipe 34 away from the plate group blades 31, and the outer wall of the condensing plate type demisting dust collector cooling pipe 34 is coated with an oil-repellent heat-conducting material. The condensing plate type demisting dust collector 3 is provided with a condensing plate type demisting dust collector water inlet end 33 and a condensing plate type demisting dust collector water outlet end 32. The condensing plate type demisting dust collector water inlet end 33 is respectively connected to one end of a plurality of condensing plate type demisting dust collector cooling pipes 34, and the condensing plate type demisting dust collector water outlet end 32 is respectively connected to the other end of a plurality of condensing plate type demisting dust collector cooling pipes 34. The condensing plate type demisting dust collector water inlet end 33 is connected to the water outlet end of the circulating cooling system 5 via the first circulating cooling system pipeline 51, and the condensing plate type demisting dust collector water outlet end 32 is connected to the water inlet end of the circulating cooling system 5 via the second circulating cooling system pipeline 52.

[0061] Preferably, the condensing plate type mist remover 3 is a 1-4 layer ridge type condensing plate type mist remover, which is composed of a plurality of plate group blades 31, the spacing of the plate group blades 31 is 10-35mm, the number of bends is 1-5, and the bend angle is 70-120°. Dust and tar mist droplets larger than 5μm change their flow direction at the bend in the channel, collide and condense with the surface of the plate group blades 31, adsorb and increase each other to form a liquid flow, and as the liquid flow continues to increase, the liquid flow will be under the action of gravity. A condensing plate type demisting dust collector cooling pipe 34 is provided at the bend, the water inlet end 33 of the condensing plate type demisting dust collector is connected to the water outlet end of the circulating cooling system 5 through the first pipeline 51 of the circulating cooling system, and the water outlet end 32 of the condensing plate type demisting dust collector is connected to the water inlet end of the circulating cooling system 5 through the second pipeline 52 of the circulating cooling system. The cooling medium flows in the cooling pipe 34 of the condensing plate type demisting dust collector to reduce the temperature, and the tar mist droplets condense on the surface, thereby improving the condensation and aggregation effect of the tar mist droplets and dust above 5μm on the plate group blades 31. The cooling pipe 34 of the condensing plate type demisting dust collector is provided with a barb and coated with an oil-repellent heat-conductive material to improve the heat exchange efficiency, enhance the condensation effect, and reduce the load of the high-precision condensing fiber demisting dust collector and the system operation flexibility.

[0062] In another embodiment, if Figure 1 , Figure 4As shown, on the basis of the above embodiment, the circulating cooling system 5 is further provided with a first circulating cooling system pipeline 51 and a second circulating cooling system pipeline 52. The condensing fiber demisting dust collector 4 includes several layers of fiber filament groups arranged side by side, and the fiber filament groups include several staggered fiber filaments 41, and a condensing fiber demisting dust collector cooling pipe 44 is wound in each fiber filament group. Among them, the diameter of the fiber filament 41 is 5μm-100μm, the outer wall of the fiber filament 41 is coated with an oil-repellent heat-conductive material, and the fiber filament 41 is provided with a first spiral protrusion. The outer wall of the condensing fiber demisting dust collector cooling pipe 44 is coated with an oil-repellent heat-conductive material, and the condensing fiber demisting dust collector cooling pipe 44 is provided with a second spiral protrusion. The condensing fiber mist collector 4 is provided with a condensing fiber mist collector water inlet 43 and a condensing fiber mist collector water outlet 42. The condensing fiber mist collector water inlet 43 is respectively connected to one end of a plurality of condensing fiber mist collector cooling pipes 44, and the condensing fiber mist collector water outlet 42 is respectively connected to the other end of a plurality of condensing fiber mist collector cooling pipes 44. The condensing fiber mist collector water inlet 43 is connected to the water outlet of the circulating cooling system 5 via the first circulating cooling system pipeline 51, and the condensing fiber mist collector water outlet 42 is connected to the water inlet of the circulating cooling system 5 via the second circulating cooling system pipeline 52.

[0063] Preferably, the condensing fiber mist remover 4 is composed of multiple layers of loose fiber filaments 41, the fiber filaments 41 are coated with oil-repellent heat-conductive material, with a diameter of 5 to 100 um and provided with spiral protrusions to increase the specific surface area of ​​the fiber. Dust and tar droplets below 5 μm collide with the fiber surface and rebound due to inertial collision, direct interception and Brownian motion. In the gaps of the loose fiber bed, they collide and adsorb with other dust-containing tar droplets to increase. The enlarged dust-containing tar droplets continuously adsorb tiny particles in the gas, and form liquid flow after increasing to a certain extent. Due to the oil-repellent effect of the fiber, the liquid flow will not be adsorbed on the fiber surface, and will be removed along the fiber surface under the action of gravity. A condensing fiber demisting and dust collector cooling pipe 44 is wound in the middle of each layer of fiber filaments 41, and the water inlet end 43 of the condensing fiber demisting and dust collector is connected to the water outlet end of the circulating cooling system 5 through the first pipeline 51 of the circulating cooling system, and the water outlet end 42 of the condensing fiber demisting and dust collector is connected to the water inlet end of the circulating cooling system 5 through the second pipeline 52 of the circulating cooling system. The cooling medium flows in the condensing fiber demisting and dust collector cooling pipe 44 to reduce the temperature, and the tar droplets condense on the surface, thereby improving the condensation and aggregation effect of tar droplets and dust below 5μm on the fiber surface. The condensing fiber demisting and dust collector cooling pipe 44 is provided with threads and coated with oil-repellent heat-conductive material to improve the heat exchange efficiency and enhance the condensation effect.

[0064] In another embodiment, if Figures 1 to 4As shown, based on the above embodiments, this embodiment provides a step-wise condensation demisting and dust removal method for coke oven gas, and the method of using the step-wise condensation demisting and dust removal system for coke oven gas in any of the above embodiments comprises the following steps:

[0065] Untreated coke oven gas enters the gas channel through the gas inlet 11 at the lower end of the tower shell 1;

[0066] The coal gas with tar mist droplets and dust rises and passes through the condenser tube type demisting and dust collector 2. The condenser tube type demisting and dust collector 2 uses the inertial collision and tar mist droplet condensation principle to pre-treat the large-size dust and tar mist droplets in the coke oven gas;

[0067] The pre-treated coal gas rises and passes through the condensing plate type demisting and dust collector 3 for preliminary treatment. The condensing plate type demisting and dust collector 3 uses the collision condensation and tar droplet condensation principle to remove dust and tar droplet content larger than 5μm in the coal gas;

[0068] The coal gas after preliminary treatment rises and passes through the condensation fiber demisting and dust removal device 4. The condensation fiber demisting and dust removal device 4 utilizes multiple effects such as inertial collision, direct interception, Brownian motion, collision coagulation and tar droplet condensation to remove dust and tar droplet content below 5 μm in the coal gas, thereby further reducing the tar droplet content of the coke oven gas.

[0069] During the coal gas treatment process, the refrigerant cools the condenser tube type mist collector 2, the condenser plate type mist collector 3, and the condenser fiber mist collector 4 through the circulating cooling system 5, thereby further reducing the dust and tar droplet content in the coal gas.

[0070] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0071] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A step-condensation demisting and dust removal system for coke oven gas, characterized in that: include: A tower shell, a circulating cooling system, and a condenser tube type demisting and dust collector, a condenser plate type demisting and dust collector, and a condenser fiber demisting and dust collector arranged inside the tower shell; A gas inlet is provided at the lower end of the tower shell, a gas passage is provided inside the tower shell, and a gas outlet is provided at the upper end of the tower shell; The condenser type mist remover is located on the upper side of the coal gas inlet, and is used to reduce the content of dust and tar droplets of preset diameters, and to make the gas flow field evenly distributed; The condensing plate type demisting and dust collector is located on the upper side of the condensing tube type demisting and dust collector, and is used to remove dust and tar droplets larger than 5 μm in the coal gas; The condensing fiber demisting and dust collector is located between the condensing plate demisting and dust collector and the coal gas outlet, and is used to remove dust and tar droplets below 5 μm in the coal gas; The circulating cooling system is respectively connected to the condenser tube type demisting and dust collector, the condenser plate type demisting and dust collector, and the condenser fiber demisting and dust collector, and is used for cooling and lowering the temperature of coal gas; The condensing fiber demisting and dust collector comprises a plurality of layers of fiber filament groups arranged side by side, wherein the fiber filament groups comprise a plurality of staggered fiber filaments, and a condensing fiber demisting and dust collector cooling pipe is wound inside each of the fiber filament groups.

2. The step-condensation demisting and dust removal system for coke oven gas according to claim 1 is characterized in that: The condenser type demisting and dust collecting device comprises a single condenser type demisting and dust collecting device tube group or at least two layers of staggered single condenser type demisting and dust collecting device tube groups; The condenser type demisting and dust collecting pipe group includes a plurality of single condenser type demisting and dust collecting pipes arranged at a preset distance, and the single condenser type demisting and dust collecting pipes are provided with a condenser type demisting and dust collecting water inlet end and a condenser type demisting and dust collecting water outlet end. The condenser type demisting and dust collecting water inlet end is connected to the water outlet end of the circulating cooling system via a first pipeline, and the condenser type demisting and dust collecting water outlet end is connected to the water inlet end of the circulating cooling system via a second pipeline.

3. The step-condensation demisting and dust removal system for coke oven gas according to claim 2 is characterized in that: The single condenser tube type mist and dust collector tube is in the shape of a hollow inverted water droplet, and comprises a first side wall, a second side wall and an arc-shaped wall connected end to end in sequence, and the angle between the first side wall and the second side wall is 60°-120°; The outer wall of the single condenser tube type demisting and dust collecting device tube is coated with an oil-repellent heat-conducting material.

4. The step-condensation demisting and dust removal system for coke oven gas according to claim 1 is characterized in that: The condensing plate type mist and dust collector comprises at least one layer of plate group and blade group; The plate group blade group includes a plurality of plate group blades arranged side by side, and the plate group blades include a plurality of blade plates connected end to end, and two adjacent blade plates are arranged at an angle.

5. The step-wise condensation demisting and dust removal system for coke oven gas according to claim 4 is characterized in that: The distance between two adjacent blades of the plate group is 10mm-35mm; The included angle between two adjacent blade plates is 70°-120°; The outer walls of the plate group blades are coated with an oil-repellent heat-conducting material.

6. The step-wise condensation demisting and dust removal system for coke oven gas according to claim 5, characterized in that: The condensing plate type mist remover and dust collector also includes: A plurality of condensing plate type demisting and dust collecting cooling pipes, wherein the condensing plate type demisting and dust collecting cooling pipes are arranged at the connection between two adjacent blade plates, each of the condensing plate type demisting and dust collecting cooling pipes is provided with a barb, and the barb is located on a side of the condensing plate type demisting and dust collecting cooling pipe away from the plate group blades, and the outer wall of the condensing plate type demisting and dust collecting cooling pipe is coated with an oil-repellent heat-conducting material; The condensing plate type demisting and dust collector cooling pipe is provided with a condensing plate type demisting and dust collector water inlet end and a condensing plate type demisting and dust collector water outlet end. The condensing plate type demisting and dust collector water inlet end is connected to the circulating cooling system water outlet end via a third pipeline, and the condensing plate type demisting and dust collector water outlet end is connected to the circulating cooling system water inlet end via a fourth pipeline.

7. The step-condensation demisting and dust removal system for coke oven gas according to claim 1 is characterized in that: The cooling pipe of the condensing fiber demisting and dust collector is provided with a water inlet end and a water outlet end of the condensing fiber demisting and dust collector. The water inlet end of the condensing fiber demisting and dust collector is connected to the water outlet end of the circulating cooling system via a fifth pipeline, and the water outlet end of the condensing fiber demisting and dust collector is connected to the water inlet end of the circulating cooling system via a sixth pipeline.

8. The step-condensation demisting and dust removal system for coke oven gas according to claim 7 is characterized in that: The diameter of the fiber filament is 5 μm-100 μm; The outer side wall of the fiber filament is coated with an oil-repellent heat-conducting material; The fiber filament is provided with a first spiral protrusion.

9. The step-condensation demisting and dust removal system for coke oven gas according to claim 7, characterized in that: The outer side wall of the cooling pipe of the condensing fiber demisting and dust removing device is coated with an oil-repellent heat-conducting material; A second spiral protrusion is provided on the cooling pipe of the condensing fiber demisting and dust removing device.

10. A method for demisting and dust removal by step condensation of coke oven gas, characterized in that: The method of using the step-condensation demisting and dust removal system for coke oven gas according to any one of claims 1 to 9 comprises the following steps: Untreated coke oven gas enters the tower through the gas inlet of the tower shell, and the dust and tar droplets of preset diameter in the coke oven gas are pre-treated by the condenser tube type mist remover; The pre-treated coal gas rises and is initially treated by a condensing plate type mist remover to remove dust and tar droplets larger than 5μm in the coal gas; The initially treated coal gas rises and is treated again by the condensing fiber mist remover to remove dust and tar droplets below 5μm in the coal gas; The refrigerant cools down the coal gas through the circulating cooling system to the condenser tube type mist collector, the condenser plate type mist collector and the condenser fiber mist collector.

Images