Dry-process fine desulfurization system for coke oven gas

Abstract

The utility model relates to the technical field of coke oven gas desulfurization, in particular to a coke oven gas dry fine desulfurization system which comprises a pretreatment unit, a heat exchange unit, a hydrolysis unit and a desulfurization unit, the pretreatment unit is used for removing pollutants such as tar and particulate matters in coke oven gas; the heat exchange unit is used for heating or cooling coke oven gas; the hydrolysis unit is used for hydrolyzing organic sulfur in the coke oven gas into inorganic sulfur; the desulfurization unit is used for removing inorganic sulfur in the coke oven gas; through cooperation of the units, fine desulfurization is carried out on coke oven gas at the front end, the number of desulfurization devices constructed by tail end users is reduced, the overall investment is reduced, the technological process is simple, and more energy-saving and environment-friendly effects are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of coke oven gas desulfurization, in particular to a coke oven gas dry fine desulfurization system. Background Art

[0002] The coking process is the link with the highest pollutant emissions in the steel industry. It produces a large amount of coke oven gas. Generally, each ton of dry coal can produce 300 to 350 m3 of coke oven gas. 3 (Standard state). Coke oven gas contains relatively high levels of impurities such as tar, naphthalene, and sulfides. At present, the purification of coke oven gas is mainly crude desulfurization, which removes impurities such as tar, naphthalene, benzene and ammonia. However, the sulfide concentration after crude desulfurization is still very high. After use by end users, the SO2 emission concentration cannot meet the increasingly stringent pollutant emission standards. It is urgent to use the coke oven gas after fine desulfurization. The sulfides in coke oven gas are mainly divided into two categories: organic sulfur and inorganic sulfur. Organic sulfur mainly includes carbonyl sulfide (COS), thiophene, etc., accounting for more than 50%; inorganic sulfur mainly includes H2S, CS2, etc. At present, the fine desulfurization process of coke oven gas is mainly divided into two categories: step-by-step fine desulfurization and integrated fine desulfurization. There are two main step-by-step fine desulfurization processes: catalytic hydrogenation + dry / wet desulfurization, and catalytic hydrolysis + dry / wet desulfurization. Both catalytic hydrogenation and catalytic hydrolysis convert organic sulfur in coal gas into inorganic sulfur (mainly H2S) and then use the common dry / wet method to remove H2S. However, catalytic hydrogenation requires high temperature, high pressure and high H2 content. It is currently mainly used in the petrochemical industry. It has many side reactions, high energy consumption, poor economic efficiency and high processing equipment costs. At present, it is basically not used in the field of coke oven gas purification. Catalytic hydrolysis uses the moisture in coke oven gas to convert organic sulfur into H2S under the action of a catalyst and then remove it. The reaction conditions it requires match the characteristics of coke oven gas and it is currently widely used.

[0003] Therefore, this application proposes a coke oven gas dry fine desulfurization system, which is used to carry out fine desulfurization treatment on the coke oven gas at the front end, and then transport it to the back end users for direct use after treatment. The SO2 content in the coke oven gas after combustion is lower than the current emission standard, so there is no need to build multiple sets of desulfurization equipment at the end user, which reduces investment and floor space, saves energy and protects the environment, and can improve quality and efficiency. In addition, in this application, since the coke oven gas is finely desulfurized before use, it is necessary to first hydrolyze the organic sulfur in the coke oven gas into inorganic sulfur. This application realizes the recycling of energy through the difference in temperature required by the hydrolysis unit and the desulfurization unit, and the use of a heat exchange unit in conjunction with the former, and adopts dry desulfurization throughout the process, without exhaust gas and wastewater discharge, which is energy-saving and environmentally friendly. Utility Model Content

[0004] To achieve the above objectives, the utility model is implemented through the following technical solutions: The utility model provides a coke oven gas dry fine desulfurization system, including: a pretreatment unit, a heat exchange unit, a hydrolysis unit and a desulfurization unit;

[0005] The pretreatment unit comprises a coke oven gas holder and a pretreatment tower, wherein the pretreatment tower has an air inlet at the lower middle portion and a pretreatment tower outlet at the upper middle portion; the air inlet of the pretreatment tower is connected to the air outlet of the coke oven gas holder;

[0006] The hydrolysis unit comprises a hydrolysis tower, wherein the hydrolysis tower has a hydrolysis tower air inlet and a hydrolysis tower air outlet;

[0007] The desulfurization unit comprises a desulfurization tower, and the desulfurization tower has a desulfurization tower air inlet and a desulfurization tower air outlet;

[0008] The heat exchange unit includes a heat exchanger, wherein the air inlet on the cold transfer side of the heat exchanger is connected to the air outlet of the pretreatment tower; the air outlet on the cold transfer side of the heat exchanger is connected to the air inlet of the hydrolysis tower; the air inlet on the heat transfer side of the heat exchanger is connected to the air outlet of the hydrolysis tower; and the air outlet on the heat transfer side of the heat exchanger is connected to the air inlet of the desulfurization tower.

[0009] Preferably, the coke oven gas dry fine desulfurization system further comprises a heater, and the heater is arranged on the passage between the cold transfer side air outlet of the heat exchanger and the air inlet of the hydrolysis tower.

[0010] Preferably, the heater comprises a first cold circuit and a first hot circuit;

[0011] The first cold circuit air inlet of the heater is connected to the cold transfer side air outlet of the heat exchanger, and the first cold circuit air outlet of the heater is connected to the air inlet of the hydrolysis tower;

[0012] The inlet of the first heat circuit of the heater is used for introducing heat medium, and the outlet of the first heat circuit of the heater is used for discharging heat medium, and the heat medium includes steam and / or hot air.

[0013] Preferably, the coke oven gas dry fine desulfurization system further comprises a cooler, and the cooler is arranged on the passage between the air outlet on the heat transfer side of the heat exchanger and the air inlet of the desulfurization tower.

[0014] Preferably, the cooler comprises a second cold circuit and a second hot circuit;

[0015] The air inlet of the second heat path of the cooler is connected to the air outlet on the heat transfer side of the heat exchanger, and the air outlet of the second heat path of the cooler is connected to the air inlet of the desulfurization tower;

[0016] The second cold circuit inlet of the cooler is used for introducing a refrigerant, and the second cold circuit outlet of the heater is used for discharging the refrigerant, wherein the refrigerant includes cooling water and / or cold air.

[0017] Preferably, the air inlet of the hydrolysis tower is located at a lower middle portion of the hydrolysis tower, and the air outlet of the hydrolysis tower is located at an upper middle portion of the hydrolysis tower.

[0018] Preferably, the air inlet of the desulfurization tower is located at a lower middle portion of the desulfurization tower, and the air outlet of the desulfurization tower is located at an upper middle portion of the desulfurization tower.

[0019] Preferably, the desulfurization tower is filled with a desulfurizer, which includes activated iron oxide and activated carbon, and is used to adsorb and remove inorganic sulfur in the coke oven gas.

[0020] Preferably, the coke oven gas dry fine desulfurization system also includes a supercharger, which is arranged on the passage between the gas outlet of the coke oven gas tank and the gas inlet of the pretreatment tower, and is used to make the coke oven gas flow unidirectionally from the coke oven gas tank to the pretreatment tower.

[0021] Preferably, when the heater comprises a first cold circuit and a first hot circuit, the heat medium flowing out of the outlet of the first hot circuit of the heater flows back to the inlet of the second cold circuit of the cooler after being cooled.

[0022] In the utility model, a coke oven gas dry fine desulfurization system is provided, comprising a pretreatment unit, a heat exchange unit, a hydrolysis unit and a desulfurization unit; the pretreatment unit is used to remove pollutants such as tar and particulate matter in the coke oven gas; the heat exchange unit is used to heat or cool the coke oven gas; the hydrolysis unit is used to hydrolyze the organic sulfur in the coke oven gas into inorganic sulfur; the desulfurization unit is used to remove the inorganic sulfur in the coke oven gas; through the coordinated action of the above-mentioned units, the coke oven gas is fully desulfurized at the front end of the industrial production chain, and the whole process is simple, the heat exchange efficiency is improved, it is more energy-saving, and the desulfurization efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 The utility model discloses a flow chart of a coke oven gas dry fine desulfurization system.

[0025] The accompanying drawings are denoted as follows:

[0026] 10-pretreatment unit; 11-coke oven gas holder; 12-pretreatment tower; 13-booster; 20-heat exchange unit; 30-heater; 40-hydrolysis unit; 50-cooler; 60-desulfurization unit. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] As used in the present invention, the singular forms "a", "an" and "the" include plural objects, the term "or" is generally used in a sense including "and / or", the term "several" is generally used in a sense including "at least one", and the term "at least two" is generally used in a sense including "two or more". In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include one or at least two of the features. The term "proximal end" is usually the end close to the operator, and the term "distal end" is usually the end close to the patient. "One end" and "the other end" as well as "proximal end" and "distal end" usually refer to two corresponding parts, which include not only the endpoints. The terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of the two elements or the interaction relationship between the two elements. In addition, as used in the present utility model, an element is arranged on another element, which usually only means that there is a connection, coupling, matching or transmission relationship between the two elements, and the connection, coupling, matching or transmission between the two elements can be direct or indirect through an intermediate element, and it cannot be understood as indicating or implying the spatial position relationship between the two elements, that is, one element can be in any position such as inside, outside, above, below or on one side of another element, unless the content clearly indicates otherwise. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] Please refer to Figure 1As shown, a schematic diagram of a coke oven gas dry fine desulfurization system provided in the utility model comprises: a pretreatment unit 10, a heat exchange unit 20, a hydrolysis unit 40 and a desulfurization unit 60; the pretreatment unit 10 comprises a coke oven gas holder 11 and a pretreatment tower 12, the pretreatment tower 12 has a pretreatment tower air inlet at a lower middle position, and the pretreatment tower 12 has a pretreatment tower air outlet at an upper middle position; the pretreatment tower air inlet is connected to the coke oven gas holder air outlet; the hydrolysis unit 40 comprises a hydrolysis unit 1 ...; the pretreatment tower air inlet is connected to the coke oven gas holder air outlet; the hydrolysis unit 40 comprises a hydrolysis unit 11 and a desulfurization unit 60; the pretreatment unit 10 comprises a coke oven gas holder 11 and a pretreatment tower 12; the pretreatment tower 12 has a pretreatment tower air inlet at a lower middle position, and the pretreatment tower 12 has a pretreatment tower air outlet; the pretreatment tower air inlet is connected to the coke oven gas holder air outlet; the hydrolysis unit 40 comprises a hydrolysis unit 11 and a desulfurization unit 60; the pretreatment unit 10 comprises a coke oven gas holder 11 and a desulfurization unit 60; the pretreatment unit 10 comprises a coke oven gas holder 11 and The hydrolysis tower has an air inlet and an air outlet of the hydrolysis tower; the desulfurization unit 60 includes a desulfurization tower, and the desulfurization tower has an air inlet and an air outlet of the desulfurization tower; the heat exchange unit 20 includes a heat exchanger, and the air inlet of the cold transfer side of the heat exchanger is connected to the air outlet of the pretreatment tower; the air outlet of the cold transfer side of the heat exchanger is connected to the air inlet of the hydrolysis tower; the air inlet of the heat transfer side of the heat exchanger is connected to the air outlet of the hydrolysis tower; the air outlet of the heat transfer side of the heat exchanger is connected to the air inlet of the desulfurization tower.

[0030] It is worth noting that in the present embodiment, since the density of the coke oven gas is lower than that of the air, the air inlet of the pretreatment tower is arranged at the lower middle part of the pretreatment tower 12, and the air outlet of the pretreatment tower is arranged at the upper middle part of the pretreatment tower 12; and / or, the air inlet of the hydrolysis tower is arranged at the lower middle part of the hydrolysis tower, and the air outlet of the hydrolysis tower is arranged at the upper middle part of the hydrolysis tower; and / or, the air inlet of the desulfurization tower is arranged at the lower middle part of the desulfurization tower, and the air outlet of the desulfurization tower is arranged at the upper middle part of the desulfurization tower; thereby, the coke oven gas can realize the flow of top-in and bottom-out in the pretreatment tower 12, the hydrolysis tower and the desulfurization tower, avoiding the setting of too many air pumps or pressure pumps for drainage, thereby making the entire system more simple.

[0031] In the present application, the pretreatment tower 12 is used to perform rough desulfurization for the coke oven gas. The pretreatment tower usually has a filter layer or an adsorption layer. The coke oven gas enters the pretreatment tower 12 and passes through the filter layer or the adsorption layer before being discharged. The pretreatment tower 12 is specifically used to remove impurities such as tar, naphthalene, benzene and ammonia in the coke oven gas. The hydrolysis tower has a catalyst, and the catalyst is used to convert the organic sulfur in the coke oven gas into inorganic sulfur by using the moisture in the coke oven gas. The desulfurization tower has a bed layer (adsorption layer, and the bed layer has an adsorbent). The coke oven gas enters from the bottom and exits from the top through the bed layer, which is specifically used to remove the inorganic sulfur in the coke oven gas. The above are all prior arts, and the present application does not make too many restrictions and elaborations here.

[0032] Please refer to Figure 1As shown, the coke oven gas dry fine desulfurization system of the present application also includes a heater 30 and a cooler 50, wherein the heater 30 is arranged on the passage between the air outlet of the cold transfer side of the heat exchanger and the air inlet of the hydrolysis tower; the cold transfer side of the heat exchanger is used to heat the coke oven gas flowing out of the pretreatment tower 12 to 110-120 degrees Celsius and then transport it to the first cold circuit of the heater 30, and the first cold circuit of the heater 30 is used to further heat the coke oven gas heated by the cold transfer side of the heat exchanger to 130-150 degrees Celsius and then transport it to The air inlet of the hydrolysis tower; the cooler 50 is arranged on the passage between the air outlet on the heat transfer side of the heat exchanger and the air inlet of the desulfurization tower, the heat transfer side of the heat exchanger is used to cool the coke oven gas flowing out of the air outlet of the hydrolysis tower to about 50-60 degrees Celsius, and transport the cooled coke oven gas to the second heat path air inlet of the cooler 50, the cooler 50 is used to further cool the coke oven gas of 50-60 degrees Celsius after being cooled by the heat transfer side of the heat exchanger to 30-50 degrees Celsius and then transport it to the desulfurization tower.

[0033] In other alternative embodiments, the heater 30 and the cooler 50 may not be additionally provided to further heat up or cool down the coke oven gas. However, since conventional heat exchangers (including plate heat exchangers, tubular heat exchangers, etc.) are difficult to heat or cool down the coke oven gas to a large extent and accurately, and the coke oven gas will experience a certain degree of heat loss during the circulation process, the present application adopts the provision of the heater 30 and the cooler 50 as a preferred embodiment, but the present application does not make too many restrictions here.

[0034] Please refer to Figure 1As shown, in the present application, the heater 30 also has a first heat circuit, the inlet of the first heat circuit is used to introduce heat medium, and the outlet of the first heat circuit of the heater is used to discharge heat medium, and the heat medium includes steam and hot air. In addition, the cooler 50 also has a second cold circuit, and the second cold circuit of the cooler 50 is used to introduce refrigerant, and the outlet of the second cold circuit of the heater 30 is used to discharge refrigerant, and the refrigerant includes cooling water and / or cold air. The first cold circuit and the first hot circuit are independently arranged, and the second cold circuit and the second hot circuit are independently arranged, so that the coke oven gas introduced into the first cold circuit does not contact the heat medium, and the coke oven gas in the second hot circuit does not contact the refrigerant. On the one hand, the blast furnace gas is not polluted, and on the other hand On the one hand, the independence of the blast furnace gas passage is ensured, so that a dry environment is maintained during the desulfurization process of the coke oven gas; it is worth noting that the heat medium and the refrigerant can be kept consistent, that is, when the heat medium is steam, the refrigerant can use cooling water accordingly; when the heat medium is hot air, the refrigerant can use cold air accordingly, so that when the heat medium is naturally cooled after being used by the heater, and / or, after being cooled by other industrial systems, it can be recycled as the refrigerant of the present application again, that is, when the heater 30 includes a first cold circuit and a first hot circuit, the heat medium flowing out of the outlet of the first hot circuit of the heater 30 is cooled and refluxed to the inlet of the second cold circuit of the cooler 50, thereby reducing energy consumption and saving costs.

[0035] It is worth noting that in the present application, dry desulfurization is adopted throughout the whole process, so as to avoid the generation of excess wastewater and waste gas, and the comprehensive desulfurization efficiency is relatively high. Specifically, the desulfurization unit 60 includes a desulfurization tower, and the desulfurization tower is filled with a desulfurizer. The desulfurizer includes activated iron oxide and activated carbon. The desulfurizer is used to adsorb and remove inorganic sulfur in the coke oven gas. The desulfurization tower desulfurizes the inorganic sulfur through the strong adsorption capacity of the activated iron oxide and the activated carbon, and the process is safe and reliable.

[0036] Please refer to Figure 1As shown, the coke oven gas dry fine desulfurization system described in the present application also includes a booster 13, which is arranged on the passage between the gas outlet of the coke oven gas holder and the gas inlet of the pretreatment tower. The booster 13 is used to make the coke oven gas flow unidirectionally from the coke oven gas holder 11 to the pretreatment tower 12. The coke oven gas holder 11 is used to store and provide the coke oven gas to the pretreatment tower 12. The gas outlet of the coke oven gas holder is usually arranged in the lower middle position, and the upper middle position is often in a sealed state, so as to better prevent the risk of leakage of the coke oven gas due to poor pipeline sealing. Therefore, the booster 13 needs to be arranged on the passage between the pretreatment tower 12 and the coke oven gas holder 11 to provide a pressure difference for the passage, so that the coke oven gas flows unidirectionally from the coke oven gas holder 11 to the pretreatment tower 12.

[0037] It is worth noting that the booster includes an air pump and a cylinder booster device, and the coke oven gas tank is a barrel-type cast iron gas storage tank, and can also be a fiberglass horizontal gas storage tank. The above are all prior arts, and this application does not make too many limitations and elaborations here.

[0038] In the present application, the coke oven gas dry fine desulfurization system is used at the front end of the industrial chain, that is, the coke oven gas can be fully finely desulfurized before it is transported to the downstream customers, so that the coke oven gas used by the downstream customers is already coke oven gas with sulfide content that meets the standards. In addition, the coke oven gas dry fine desulfurization system is arranged at the front end of the industrial chain, so that the coke oven gas is uniformly finely desulfurized at the front end, thereby avoiding the installation of too many additional coke oven gas desulfurization equipment at the downstream customers, which is more economical.

[0039] In summary, in the present invention, a coke oven gas dry fine desulfurization system is proposed, comprising a pretreatment unit 10, a heat exchange unit 20, a hydrolysis unit 40 and a desulfurization unit 60; the pretreatment unit 10 is used to remove pollutants such as tar and particulate matter in the coke oven gas; the heat exchange unit 20 is used to heat or cool the coke oven gas; the hydrolysis unit 40 is used to hydrolyze the organic sulfur in the coke oven gas into inorganic sulfur; the desulfurization unit 60 is used to remove the inorganic sulfur in the coke oven gas; the coke oven gas dry fine desulfurization system is used to perform fine desulfurization treatment on the coke oven gas at the front end, and then transport it to the back-end users for direct use after treatment. The sulfide content in the coke oven gas after use is lower than the pollutant emission standard, so it is no longer necessary to build multiple sets of desulfurization equipment at different back-end users, thereby reducing investment costs and floor space. In addition, in the present application, since the coke oven gas is finely desulfurized before use, the organic sulfur in the coke oven gas needs to be hydrolyzed into inorganic sulfur first. The present application realizes the recycling of energy through the difference in the working temperature of the hydrolysis unit 40 and the desulfurization unit 60, and the use of the heat exchange unit 20, the heater 30 and the cooler 50 in conjunction with the former, and adopts dry desulfurization throughout the process, without exhaust gas and wastewater discharge, which is more environmentally friendly and energy-saving.

[0040] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A coke oven gas dry fine desulfurization system, characterized by: include: Pretreatment unit, heat exchange unit, hydrolysis unit and desulfurization unit; The pretreatment unit comprises a coke oven gas holder and a pretreatment tower, wherein the pretreatment tower has an air inlet at the lower middle portion and a pretreatment tower outlet at the upper middle portion; the air inlet of the pretreatment tower is connected to the air outlet of the coke oven gas holder; The hydrolysis unit comprises a hydrolysis tower, wherein the hydrolysis tower has a hydrolysis tower air inlet and a hydrolysis tower air outlet; The desulfurization unit comprises a desulfurization tower, and the desulfurization tower has a desulfurization tower air inlet and a desulfurization tower air outlet; The heat exchange unit includes a heat exchanger, wherein the air inlet on the cold transfer side of the heat exchanger is connected to the air outlet of the pretreatment tower; the air outlet on the cold transfer side of the heat exchanger is connected to the air inlet of the hydrolysis tower; the air inlet on the heat transfer side of the heat exchanger is connected to the air outlet of the hydrolysis tower; and the air outlet on the heat transfer side of the heat exchanger is connected to the air inlet of the desulfurization tower.

2. A coke oven gas dry fine desulfurization system according to claim 1, characterized in that: The coke oven gas dry fine desulfurization system also includes a heater, which is arranged on the passage between the cold transfer side air outlet of the heat exchanger and the air inlet of the hydrolysis tower.

3. A coke oven gas dry fine desulfurization system according to claim 2, characterized in that: The heater comprises a first cold circuit and a first hot circuit for heat exchange; The first cold circuit air inlet is connected to the cold transfer side air outlet of the heat exchanger, and the first cold circuit air outlet is connected to the hydrolysis tower air inlet; The inlet of the first heat path is used for introducing heat medium, and the outlet of the first heat path is used for discharging heat medium, and the heat medium includes steam and / or hot air.

4. A coke oven gas dry fine desulfurization system according to claim 3, characterized in that: The coke oven gas dry fine desulfurization system also includes a cooler, which is arranged on the passage between the air outlet on the heat transfer side of the heat exchanger and the air inlet of the desulfurization tower.

5. A coke oven gas dry fine desulfurization system according to claim 4, characterized in that: The cooler comprises a second cold circuit and a second hot circuit for heat exchange; The air inlet of the second heat circuit is connected to the air outlet on the heat transfer side of the heat exchanger, and the air outlet of the second heat circuit is connected to the air inlet of the desulfurization tower; The inlet of the second cooling circuit is used for introducing a refrigerant, and the outlet of the second cooling circuit is used for discharging the refrigerant, wherein the refrigerant includes cooling water and / or cold air.

6. A coke oven gas dry fine desulfurization system according to claim 4, characterized in that: The air inlet of the hydrolysis tower is located at a lower middle position of the hydrolysis tower, and the air outlet of the hydrolysis tower is located at an upper middle position of the hydrolysis tower.

7. A coke oven gas dry fine desulfurization system according to claim 5, characterized in that: The air inlet of the desulfurization tower is located at a lower middle portion of the desulfurization tower, and the air outlet of the desulfurization tower is located at an upper middle portion of the desulfurization tower.

8. A coke oven gas dry fine desulfurization system according to claim 1, characterized in that: The desulfurization tower is filled with a desulfurizer, which includes activated iron oxide and activated carbon. The desulfurizer is used to adsorb and remove inorganic sulfur in the coke oven gas.

9. A coke oven gas dry fine desulfurization system according to claim 1, characterized in that: The coke oven gas dry fine desulfurization system also includes a supercharger, which is arranged on the passage between the gas outlet of the coke oven gas holder and the gas inlet of the pretreatment tower, and is used to make the coke oven gas flow unidirectionally from the coke oven gas holder to the pretreatment tower.

10. A coke oven gas dry fine desulfurization system according to claim 5, characterized in that: When the heater includes a first cold circuit and a first hot circuit, the heat medium flowing out of the outlet of the first hot circuit flows back to the inlet of the second cold circuit after being cooled.

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