Active coke tail gas treatment system and method

Abstract

This invention discloses an activated coke production tail gas treatment system and method. The tail gas treatment system includes a dust removal unit, a tar removal unit, and a heat exchange unit. The dust removal unit removes dust from the tail gas. The inlet of the tar removal unit is connected to the outlet of the dust removal unit via a first pipeline, and a first valve is installed on the first pipeline. The hot-side inlet of the heat exchange unit is connected to the outlets of the dust removal unit and the tar removal unit via second and third pipelines, respectively, and a second valve is installed on the second pipeline. The hot-side outlet of the heat exchange unit is connected to an oil storage tank and a desulfurization and denitrification unit via fourth and fifth pipelines, respectively, and a third valve is installed on the fourth pipeline and a fourth valve is installed on the fifth pipeline. The activated coke production tail gas treatment system of this invention can select different tail gas treatment paths according to different tail gas composition characteristics and actual needs, resulting in clean and efficient operation.

Description

Technical Field

[0001] This invention belongs to the field of waste gas treatment technology, and particularly relates to an activated coke tail gas treatment system and method. Background Technology

[0002] The carbonization process in activated coke production is essentially the dry distillation of materials under low-temperature conditions. During this process, the material is gradually heated within a certain low-temperature range and in the absence of air. Low-molecular-weight substances in the material volatilize first, followed by the decomposition of coal and coal tar pitch, producing carbonization tail gas. The main components of this tail gas are volatile compounds such as CO, H2, CH4, alkanes, olefins, and coal tar. Directly releasing these substances into the atmosphere will pollute the surrounding environment. Traditional carbonization tail gas treatment devices mostly perform simple purification of the harmful substances before releasing the gas into the air, which not only causes environmental pollution but also results in a waste of resources as the gas still contains a large amount of heat and recyclable materials.

[0003] Several methods exist for treating carbonization tail gas during activated coke production, but all have varying degrees of drawbacks. For example:

[0004] In some methods, the exhaust gas treatment device mainly consists of four parts: a tar recovery tank, a carbonization exhaust gas cooler, a steam-water separator, and an exhaust gas purifier. Under the action of a low-pressure fan, the exhaust gas enters the carbonization exhaust gas cooler through the exhaust gas inlet. After condensation, it forms low-temperature gas and condensate. The low-temperature gas passes through a demister and enters the steam-water separator to separate the gas and water. The dried low-temperature gas enters the purifier through the inlet. After purification by the purifier, it becomes clean gas and is discharged into the atmosphere through the separator, low-pressure fan, and exhaust pipe. Under the action of the condensate discharge pump, the condensate enters the tar recovery tank through the condensate outlet valve, condensate outlet pipe, condensate discharge pump, and inlet. After static stratification and separation, the condition of the recovery tank is observed through the liquid level indicator. When the condensate reaches a certain amount, the water and coal tar are discharged through the drain valve and drain outlet for recycling. Although the carbonization tail gas treatment device of this method recovers and utilizes tar, it fails to recover the heat of the high-temperature tail gas, resulting in energy waste and increased carbonization energy consumption. Furthermore, the tail gas purification device is simple and fails to achieve efficient and clean emission of tail gas.

[0005] In other methods, the exhaust gas treatment device includes a heat exchange mechanism for recovering heat from the exhaust gas. This mechanism includes a housing for mounting various components, with multiple heat exchange tubes inside the housing for exchanging heat. The heat exchange tubes have fins on their outer sides to enhance heat transfer. An exhaust pipe and a water supply pipe for circulating exhaust gas and clean water are also located on the outside of the housing. A hot water tank for storing hot water and connected to the outlet of the water supply pipe is located on one side of the heat exchange mechanism. A water pump connected to the inlet of the water supply pipe is located at the bottom of the hot water tank. In this method, the heat exchange mechanism for recovering heat from the exhaust gas only recovers and reuses the heat contained in the exhaust gas, without purifying and recovering the tar and gases in the exhaust gas, resulting in resource waste and environmental pollution. Summary of the Invention

[0006] In view of this, one objective of the present invention is to provide an activated coke tail gas treatment system, which can first use a dust removal unit to remove dust from the tail gas, and then, depending on the tar content, directly recover heat and tar from the high-temperature tail gas through a heat exchange unit, or remove tar through a tar removal unit, and then sequentially pass the tail gas through a heat exchange unit and a desulfurization and denitrification unit for desulfurization and denitrification. The system as a whole can realize the integrated recovery of high-temperature waste heat, tar recovery / treatment, pollutant removal, and combustible material recovery from the tail gas, which is beneficial to environmental protection and resource conservation, and also beneficial to the health of workers.

[0007] The second objective of this invention is to provide a method for treating activated coke tail gas.

[0008] To achieve the above objectives, a first aspect of the present invention provides an activated coke tail gas treatment system, comprising:

[0009] Dust removal unit, the dust removal unit is used to remove dust from exhaust gas;

[0010] A tar removal unit, wherein the inlet of the tar removal unit is connected to the outlet of the dust removal unit through a first pipeline, and a first valve is installed on the first pipeline;

[0011] The heat exchange unit has its hot-side inlet connected to the outlet of the dust removal unit and the outlet of the tar removal unit via a second pipeline and a third pipeline, respectively, with a second valve installed on the second pipeline; the heat-side outlet of the heat exchange unit is connected to the oil storage tank and the desulfurization and denitrification unit via a fourth pipeline and a fifth pipeline, respectively, with a third valve installed on the fourth pipeline and a fourth valve installed on the fifth pipeline; the cold side of the heat exchange unit is connected to a cooling medium.

[0012] In addition, the activated coke tail gas treatment system proposed in the above embodiments of the present invention may also have the following additional technical features:

[0013] In some embodiments, the dust removal unit includes a cyclone separator and a high-temperature filter connected in sequence. The inlet of the cyclone separator is connected to the activated coke carbonization tail gas source, and the outlet of the high-temperature filter is connected to the hot-side inlet of the tar removal unit and the heat exchange unit.

[0014] In some embodiments, the tar removal unit includes a tar pyrolysis device and an activated coke modification device, wherein a first inlet of the tar pyrolysis device is connected to the outlet of the dust removal unit, and a second inlet of the tar pyrolysis device is connected to the activated coke modification device.

[0015] In some embodiments, the activated coke modification device includes an impregnation tank, a washing tower, and a drying chamber connected in sequence. An ultrasonic transducer is installed on the impregnation tank, and the outlet of the drying chamber is connected to the second inlet of the tar cracking device.

[0016] In some embodiments, the heat exchange unit includes at least two heat exchangers connected in sequence, and a fifth valve is installed on the hot-side connecting pipeline and the cold-side connecting pipeline between all heat exchangers. The hot-side outlet of all heat exchangers is connected to the oil storage tank and the desulfurization and denitrification unit.

[0017] In some embodiments, the desulfurization and denitrification unit uses activated coke particles as an adsorbent.

[0018] In some embodiments, the desulfurization and denitrification unit is an integrated desulfurization and denitrification device.

[0019] In some embodiments, the desulfurization and denitrification unit includes a desulfurization device and a denitrification device, wherein the inlet of the desulfurization device is connected to the hot-side outlet of the heat exchange unit, and the outlet of the desulfurization device is connected to the inlet of the denitrification device.

[0020] In some embodiments, the activated coke tail gas treatment system further includes a gas storage tank or a gas furnace, and the outlet of the desulfurization and denitrification unit is connected to the gas storage tank or the gas furnace.

[0021] To achieve the above objectives, a second aspect of the present invention provides a method for treating activated coke carbonization tail gas, applied to the activated coke carbonization tail gas treatment system of the present invention, comprising:

[0022] The activated coke carbonization tail gas is subjected to dust removal treatment;

[0023] The tar content in the activated coke carbonization tail gas after dust removal treatment is obtained, and based on the tar content, the activated coke carbonization tail gas after dust removal treatment is treated as follows:

[0024] When the tar content in the activated coke carbonization tail gas is greater than or equal to a preset value, the activated coke carbonization tail gas, after dust removal treatment, will be heat-recovered by a heat exchange unit and the tar will be collected.

[0025] When the tar content in the activated coke carbonization tail gas is less than a preset value, the activated coke carbonization tail gas after dust removal is sequentially introduced into the tar removal unit, the heat exchange unit, and the desulfurization and denitrification unit to remove tar, recover heat, and desulfurize and denitrify, respectively.

[0026] In some embodiments, the heat exchange unit includes at least two heat exchangers connected in sequence; at least one heat exchanger participates in the heat recovery process, and when multiple heat exchangers participate in the heat recovery process, cold medium at different temperatures can be obtained from the cold side of each heat exchanger.

[0027] In some embodiments, the activated coke tail gas treatment method further includes: collecting the tail gas that has undergone desulfurization and denitrification treatment.

[0028] The beneficial effects of the activated coke tail gas treatment system of this invention are as follows:

[0029] 1. The dust removal unit effectively removes dust from the carbonization tail gas, and the tar is effectively removed in the tar removal unit, which also improves the quality of the produced gas to a certain extent; the heat exchange unit can recover the heat in the high-temperature tail gas by exchanging heat with the cooling medium and the tail gas, while providing a cooling medium to raise the temperature and recovering the tar; the desulfurization and denitrification unit uses the produced activated coke to remove pollutants from the carbonization tail gas, and finally obtains clean tail gas.

[0030] 2. The tar removal unit uses activated coke for both catalytic cracking of tar and desulfurization and denitrification, which reduces the amount of catalyst used and helps to reduce costs. At the same time, the activated coke is modified by an activated coke modification device, which helps to improve its chemical adsorption and catalytic performance, further improving the tar cracking efficiency.

[0031] 3. The heat exchange unit adopts a multi-stage heat exchanger, which helps to reduce the heat exchange temperature difference and improve the heat exchange efficiency. At the same time, the number of heat exchangers can be adjusted according to the temperature of the high-temperature exhaust gas and the temperature requirement for heating the cooling medium, making it more convenient.

[0032] 4. The processing system of the present invention is applicable to the treatment of carbonization tail gas in the preparation of biomass activated coke (with high tar content in the tail gas) and coal-based activated coke. Different tail gas treatment paths can be selected according to different tail gas composition characteristics and actual needs, which is clean and efficient.

[0033] 5. Through a complete exhaust gas treatment system, the system realizes functions such as high-temperature waste heat recovery, tar and other pollutant treatment, and combustible gas recovery of activated coke tail gas, which is conducive to saving resources and protecting the environment.

[0034] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0035] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0036] Figure 1 This is a simplified structural diagram of an activated coke tail gas treatment system according to an embodiment of the present invention (and also a simplified flowchart of an activated coke tail gas treatment method according to an embodiment of the present invention).

[0037] Figure label:

[0038] 1-Cyclone separator; 2-High temperature filter; 3-Activated coke modification device; 4-Tar cracking device; 5-Heat exchange unit; 6-Desulfurization and denitrification unit; 7-Gas storage tank; 8-Oil storage tank; 9-Activated coke particles; 10-First pipeline; 11-First valve; 12-Second pipeline; 13-Third pipeline; 14-Second valve; 15-Fourth pipeline; 16-Fifth pipeline; 17-First heat exchanger; 18-Second heat exchanger; 19-Fifth valve; 20-Third heat exchanger. Detailed Implementation

[0039] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0040] Unless otherwise specified, the equipment and raw materials involved in the embodiments of the present invention are all commercially available or prepared by known methods. Unless otherwise specified, the methods involved in the embodiments of the present invention are all conventional methods.

[0041] The activated coke tail gas treatment system of the present invention will be described below with reference to the accompanying drawings.

[0042] Figure 1 This is a simplified structural schematic diagram of an activated coke tail gas treatment system according to an embodiment of the present invention.

[0043] like Figure 1As shown, the activated coke tail gas treatment system of this invention includes a dust removal unit, a tar removal unit, and a heat exchange unit. The dust removal unit removes dust from the tail gas; the inlet of the tar removal unit is connected to the outlet of the dust removal unit via a first pipeline 10, and a first valve 11 is installed on the first pipeline 10; the hot-side inlet of the heat exchange unit 5 is connected to the outlets of the dust removal unit and the tar removal unit via a second pipeline 12 and a third pipeline 13, respectively, and a second valve 14 is installed on the second pipeline 12; the hot-side outlet of the heat exchange unit 5 is connected to an oil storage tank 8 and a desulfurization and denitrification unit 6 via a fourth pipeline 15 and a fifth pipeline 16, respectively, and a third valve is installed on the fourth pipeline 15 and a fourth valve is installed on the fifth pipeline 16; the cold side of the heat exchange unit 5 is connected to a cooling medium.

[0044] The activated coke carbonization tail gas treatment system of this invention has the following features: a dust removal unit effectively removes dust from the carbonization tail gas, and a tar removal unit effectively removes tar, while also improving the quality of the produced gas to a certain extent; a heat exchange unit recovers heat from the high-temperature tail gas by exchanging heat with the tail gas through a cooling medium, while providing a cooling medium to raise the temperature and recovering and utilizing the tar; and a desulfurization and denitrification unit uses the produced activated coke to remove pollutants from the carbonization tail gas, ultimately obtaining clean tail gas.

[0045] In some embodiments, the dust removal unit includes, but is not limited to, a cyclone separator 1 and a high-temperature filter 2 connected in sequence. The inlet of the cyclone separator 1 is connected to the activated coke carbonization tail gas source, and the outlet of the high-temperature filter 2 is connected to the hot-side inlet of the tar removal unit and the heat exchange unit 5. Specifically, the gas outlet at the top of the cyclone separator 1 is connected to the inlet of the high-temperature filter 2. During use, the carbonization tail gas enters from the inlet of the cyclone separator, where some dust is removed, and then enters the high-temperature filter for further dust filtration.

[0046] In some embodiments, the tar removal unit includes a tar pyrolysis device 4 and an activated coke modification device 3. The first inlet of the tar pyrolysis device 4 is connected to the outlet of the dust removal unit, and the second inlet of the tar pyrolysis device 4 is connected to the activated coke modification device 3. The tar pyrolysis device can be a commercially available catalytic cracking device, tar cracker electric furnace, etc. As a non-limiting example, the tar pyrolysis device includes a shell filled with activated coke particles 9. A first inlet is located near the bottom of the shell, a second inlet is located at the top of the shell, and an outlet is located near the top of the shell. In use, the exhaust gas from the dust removal unit passes through the modified activated coke particle layer from bottom to top, and the tar in the exhaust gas can be removed by chemical adsorption and catalytic cracking.

[0047] In some embodiments, the activated coke modification of this application includes impregnation, vibration, washing, and drying. The impregnation material (i.e., the modifying material) includes, but is not limited to, potassium permanganate or potassium chloride. As a non-limiting example, the activated coke modification device 3 includes an impregnation tank, a washing tower, and a drying chamber connected in sequence. An ultrasonic transducer is installed on the impregnation tank, and the outlet of the drying chamber is connected to the second inlet of the tar cracking device. The connection method is not limited to pipeline connection, conveyor belt connection, etc. During activated coke modification, the activated coke first enters the impregnation tank and is impregnated in a potassium permanganate solution under the action of the ultrasonic transducer. Then, it enters the washing tower for washing with cold water, and finally enters the drying chamber for drying. After drying, it enters the tar cracking device as a catalyst to promote the catalytic cracking reaction of tar.

[0048] In some embodiments, the heat exchange unit 5 includes at least two heat exchangers connected in sequence, and multiple heat exchangers constitute a multi-stage heat exchanger, which can exchange heat stage by stage. A fifth valve 19 is installed on the hot-side connecting pipeline and the cold-side connecting pipeline between all heat exchangers. The hot-side outlet of all heat exchangers is connected to the oil storage tank 8 and the desulfurization and denitrification unit 6. As a possible example, the heat exchange unit 5 includes a first heat exchanger 17, a second heat exchanger 18, and a third heat exchanger 20 connected in sequence. The hot and cold sides of the first heat exchanger 17, the second heat exchanger 18, and the third heat exchanger 20 are connected by pipelines, and a fifth valve 19 is installed on the hot-side connecting pipeline and the cold-side connecting pipeline of any two adjacent heat exchangers. In use, by controlling the opening of different fifth valves, the exhaust gas can be heat-exchanged stage by stage through at least one heat exchanger, or condensed and enter the oil removal tank, or enter the desulfurization and denitrification unit in gaseous state for further desulfurization and denitrification. The exhaust gas obtains a cold medium heated by at least one heat exchanger while undergoing stage-by-stage heat exchange. When all three heat exchangers are in use to achieve step-by-step heat exchange, the valves on the hot-side connecting pipelines of two adjacent heat exchangers can be opened, or the valves on the hot-side connecting pipelines of two adjacent heat exchangers can be left uninstalled.

[0049] It should be noted that the cooling medium in this invention includes, but is not limited to, cold water and cold oil. Taking cold water as an example, different numbers of heat exchangers can be controlled to operate, obtaining hot water or high-temperature steam, by controlling the opening of different fifth valves between the hot and cold sides of multiple heat exchangers, according to different exhaust gas temperatures and heat exchange requirements. The heat exchangers can be plate heat exchangers or tubular heat exchangers, etc. During use, the heat exchangers can be installed vertically, ensuring that the hot-side inlet and cold-side outlet are located at the top or bottom, and the hot-side outlet and cold-side inlet are located at the bottom or bottom, so that the cooling medium inside the heat exchanger flows counter-currently with the exhaust gas to improve heat exchange efficiency.

[0050] In some embodiments, the desulfurization and denitrification unit 6 uses activated coke particles 9 as adsorbents, which can reduce the amount of catalyst used and help reduce costs. In this invention, the activated coke particles can be activated coke obtained by an activated coke modification device, which helps to improve its chemical adsorption and catalytic performance. In some embodiments, the desulfurization and denitrification unit 6 is an integrated desulfurization and denitrification device, including but not limited to commercially available equipment such as desulfurization and denitrification towers. The desulfurization and denitrification towers include but are not limited to desulfurization and denitrification towers with a vertical cross-flow structure, such as the adsorption tower in the Chinese utility model patent with the applicant's previous authorized announcement number CN211988670U and the utility model name "A Comprehensive Pollutant Treatment System Applicable to Large Coal-fired Power Plants". It adopts a moving bed segmented arrangement, with the lower section being the desulfurization section and the upper section being the denitrification section. Activated coke is added from the top of the tower and moves from top to bottom in the feed channel by gravity. The tail gas discharged from the heat exchange unit enters from the bottom of the tower and passes through the activated coke layer. It first contacts the activated coke in the lower section to remove most of the SO2, and then NH3 is injected into the upper section to mix and react with the activated coke in the upper section to denitrify. In other embodiments, the desulfurization and denitrification unit 6 includes a desulfurization device and a denitrification device. The inlet of the desulfurization device is connected to the hot-side outlet of the heat exchange unit 5, and the outlet of the desulfurization device is connected to the inlet of the denitrification device. In use, the exhaust gas discharged from the heat exchange unit enters the desulfurization device and is first desulfurized under the action of activated coke, and then enters the denitrification device. At the same time, ammonia gas is injected into the denitrification device. The desulfurized exhaust gas removes nitrogen oxides under the action of activated coke and ammonia gas. Finally, the purified exhaust gas discharged from the denitrification device can be collected in a gas storage tank for later use or discharged into a gas furnace for combustion. As a non-limiting example, the desulfurization device can be an adsorption tower, etc., and the denitrification device can be an adsorption tower, etc.

[0051] In some embodiments, in order to collect the tail gas after treatment by the desulfurization and denitrification unit, the activated coking tail gas treatment system further includes a gas storage tank 7, and the outlet of the desulfurization and denitrification unit 6 is connected to the gas storage tank 7.

[0052] In other embodiments, in order to further treat the tail gas after the desulfurization and denitrification unit, the activated coke tail gas treatment system also includes a gas furnace. The outlet of the desulfurization and denitrification unit 6 is connected to the gas furnace, which can further combust the tail gas from the desulfurization and denitrification unit, and utilize the combustible gas in the tail gas to achieve energy recovery.

[0053] like Figure 1 As shown, taking the following example: a dust removal unit employs a cyclone separator and a high-temperature dust collector; a desulfurization and denitrification unit employs a desulfurization and denitrification tower; a tar removal unit includes an activated coke modification device and a tar cracking device; a heat exchange unit includes a first heat exchanger 17, a second heat exchanger 18, and a third heat exchanger 20 connected in sequence; the cooling medium is cold water; and a gas storage tank 7 is included, the working process of the activated coke carbonization tail gas treatment system in this embodiment of the invention is as follows:

[0054] The carbonization tail gas enters through the inlet of cyclone separator 1, where some dust is removed. The dust is discharged from the bottom outlet of cyclone separator 1, while the tail gas is discharged from the top outlet. It then enters high-temperature filter 2 for further dust filtration. The tail gas discharged from the outlet of high-temperature filter 2 undergoes different treatment paths depending on its tar content and the required tar concentration. If the tar content in the tail gas is high (tar yield in the coal used for activated coke preparation is greater than or equal to 12%) or if tar recovery is required, the tail gas is directly discharged into heat exchange unit 5. The tail gas exchanges heat with cooling water in at least one of the first heat exchanger 17, the second heat exchanger 18, and the third heat exchanger 20. The tar in the exhaust gas condenses and is discharged from the hot side outlet of each heat exchanger or the last heat exchanger, entering the oil storage tank 8 for later use. After the cooling water exchanges heat with the high-temperature exhaust gas to raise its temperature, hot water and high-temperature steam of different temperatures can be obtained through the fifth valve 19 on the cold side connecting pipeline between the heat exchangers at each stage, according to actual needs. If the tar content in the exhaust gas is low (the tar yield in the coal used for activated coke preparation is less than 12%) or if it is necessary to increase the gas yield, the exhaust gas is first discharged into the tar cracking unit 4. The tar is catalytically cracked by modified activated coke at high temperature and converted into syngas. Then, the exhaust gas is discharged into the heat exchange unit for heat exchange. The exhaust gas discharged from the heat exchange unit enters the desulfurization and denitrification unit 6 and is desulfurized first under the action of activated coke. Then, ammonia gas is injected into the tower to assist in denitrification. Finally, the purified exhaust gas discharged from the desulfurization and denitrification tower can be collected in the gas storage tank 7 for later use.

[0055] like Figure 1 As shown, the activated coke tail gas treatment method of this invention is applied to the activated coke tail gas treatment system of this invention. The treatment method includes the following steps:

[0056] S100: Dust removal treatment of activated coke carbonization tail gas;

[0057] S200: Obtain the tar content in the activated coke carbonization tail gas after dust removal treatment, and based on the tar content, perform the following treatment on the activated coke carbonization tail gas after dust removal treatment:

[0058] When the tar content in the activated coke carbonization tail gas is greater than or equal to the preset value, the activated coke carbonization tail gas that has undergone dust removal treatment will be heat recovered by heat exchange unit 5, and the tar will be collected.

[0059] When the tar content in the activated coke carbonization tail gas is less than the preset value, the activated coke carbonization tail gas after dust removal is sequentially introduced into the tar removal unit, heat exchange unit 5 and desulfurization and denitrification unit 6 to remove tar, recover heat and desulfurize and denitrify, respectively.

[0060] In some embodiments, the heat exchange unit 5 includes at least two heat exchangers connected in sequence; at least one heat exchanger participates in the heat recovery process, and when multiple heat exchangers participate in the heat recovery process, cold medium at different temperatures can be obtained from the cold side of each heat exchanger.

[0061] In some embodiments, the activated coke tail gas treatment method further includes: collecting or burning the tail gas that has been desulfurized and denitrified.

[0062] In some embodiments, the tar content in the activated coke carbonization tail gas is related to the tar yield in the coal used for activated coke preparation, and the preset value is the content when the tar yield in the coal is 12%.

[0063] The specific process of the activated coke tail gas treatment method in this embodiment of the invention is similar to the working process of the activated coke tail gas treatment system in this embodiment of the invention, and will not be described again here.

[0064] Through actual operation and testing, the activated coke tail gas treatment system and method of this embodiment of the invention have shown that the SO2 and NO in the activated coke tail gas are significantly reduced. x The emission concentration of particulate matter is less than or equal to 50 mg / m³. 3 200mg / m 3 and 20mg / m 3 .

[0065] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0067] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0069] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An activated coke tail gas treatment system, characterized in that, include: Dust removal unit, the dust removal unit is used to remove dust from exhaust gas; A tar removal unit, wherein the inlet of the tar removal unit is connected to the outlet of the dust removal unit through a first pipeline, and a first valve is installed on the first pipeline; The heat exchange unit has its hot-side inlet connected to the outlet of the dust removal unit and the outlet of the tar removal unit via a second pipeline and a third pipeline, respectively, with a second valve installed on the second pipeline; the heat-side outlet of the heat exchange unit is connected to the oil storage tank and the desulfurization and denitrification unit via a fourth pipeline and a fifth pipeline, respectively, with a third valve installed on the fourth pipeline and a fourth valve installed on the fifth pipeline; the cold side of the heat exchange unit is connected to a cooling medium.

2. The activated coke tail gas treatment system according to claim 1, characterized in that, The dust removal unit includes a cyclone separator and a high-temperature filter connected in sequence. The inlet of the cyclone separator is connected to the activated coke carbonization tail gas source, and the outlet of the high-temperature filter is connected to the tar removal unit and the hot-side inlet of the heat exchange unit.

3. The activated coke tail gas treatment system according to claim 1, characterized in that, The tar removal unit includes a tar pyrolysis device and an activated coke modification device. The first inlet of the tar pyrolysis device is connected to the outlet of the dust removal unit, and the second inlet of the tar pyrolysis device is connected to the activated coke modification device.

4. The activated coke tail gas treatment system according to claim 3, characterized in that, The activated coke modification device includes an impregnation tank, a washing tower, and a drying chamber connected in sequence. An ultrasonic transducer is installed on the impregnation tank, and the outlet of the drying chamber is connected to the second inlet of the tar cracking device.

5. The activated coke tail gas treatment system according to claim 1, characterized in that, The heat exchange unit includes at least two heat exchangers connected in sequence. A fifth valve is installed on the hot-side connecting pipeline and the cold-side connecting pipeline between all heat exchangers. The hot-side outlet of all heat exchangers is connected to the oil storage tank and the desulfurization and denitrification unit.

6. The activated coke tail gas treatment system according to claim 1, characterized in that, The desulfurization and denitrification unit uses activated coke particles as an adsorbent. And / or, the desulfurization and denitrification unit is an integrated desulfurization and denitrification device.

7. The activated coke tail gas treatment system according to claim 1, characterized in that, The desulfurization and denitrification unit includes a desulfurization device and a denitrification device. The inlet of the desulfurization device is connected to the hot side outlet of the heat exchange unit, and the outlet of the desulfurization device is connected to the inlet of the denitrification device.

8. The activated coke tail gas treatment system according to claim 1, characterized in that, It also includes a gas storage tank or a gas furnace, and the outlet of the desulfurization and denitrification unit is connected to the gas storage tank or the gas furnace.

9. A method for treating activated coke carbonization tail gas, applied to the activated coke carbonization tail gas treatment system as described in any one of claims 1 to 8, characterized in that, include: The activated coke carbonization tail gas is subjected to dust removal treatment; The tar content in the activated coke carbonization tail gas after dust removal treatment is obtained, and based on the tar content, the activated coke carbonization tail gas after dust removal treatment is treated as follows: When the tar content in the activated coke carbonization tail gas is greater than or equal to a preset value, the activated coke carbonization tail gas, after dust removal treatment, will be heat-recovered by a heat exchange unit and the tar will be collected. When the tar content in the activated coke carbonization tail gas is less than a preset value, the activated coke carbonization tail gas after dust removal is sequentially introduced into the tar removal unit, the heat exchange unit, and the desulfurization and denitrification unit to remove tar, recover heat, and desulfurize and denitrify, respectively.

10. The method for treating activated coke tail gas according to claim 9, characterized in that, The heat exchange unit includes at least two heat exchangers connected in sequence; at least one heat exchanger participates in the heat recovery process, and when multiple heat exchangers participate in the heat recovery process, cold medium of different temperatures can be obtained from the cold side of each heat exchanger. And / or, the activated coke tail gas treatment method further includes: collecting or burning the tail gas that has been desulfurized and denitrified.

Images