A microcrystalline material adsorption device for cleaning coke oven gas

Abstract

The present application relates to the technical field of coke oven gas purification, and discloses a microcrystalline material adsorption equipment for coke oven gas purification, which comprises a feeder, a first rectifying tower, a second rectifying tower and a third rectifying tower connected in sequence; a pressurizing machine is used for pressurizing or cooling the coke oven gas during the adsorption process, which is beneficial to the adsorption of adsorbate on the adsorbent; a heater is used for heating the coke oven gas during the adsorption process, which is beneficial to the regeneration of the adsorbent and the process of adsorption separation cycle; the first rectifying tower is used for primary adsorption and fine removal, and active carbon spherical adsorbents are arranged in the first rectifying tower; the second rectifying tower is used for secondary adsorption and fine removal, and iron oxide adsorbents are arranged in the first rectifying tower; the third rectifying tower is used for tertiary adsorption and fine removal, and hydrophobic microcrystalline material adsorbents are arranged in the third rectifying tower. The present application has the advantages of adopting multiple adsorption components to cooperate with graded adsorption, and adopting heating adsorption and pressure swing adsorption to improve the adsorption and regeneration effect on coke oven gas.

Description

Technical Field

[0001] This invention relates to the field of coking coal gas purification technology, specifically to a microcrystalline material adsorption device for coking coal gas purification. Background Technology

[0002] Coke is a crucial raw material for the steel industry. In recent years, along with the continuous growth of steel production capacity, the coke production capacity has also been increasing. Currently, my country ranks first globally in both coke production capacity and output. Coke oven gas is a byproduct of the coking process, a mixture of gases such as H2, CH4, CO2, and CO. The yield and composition of coke oven gas depend on the quality of the coal used for coking and the operating conditions of the coking process. Coke oven gas is a high-calorific-value gas that can be used as fuel or as an important raw material for chemical products, such as synthetic ammonia and methanol. Whether used as fuel or as a production raw material, coke oven gas requires purification treatment before use to remove H2S and HCN, meeting environmental protection and production requirements.

[0003] The existing coke oven gas purification process uses a desulfurization tower and a naphthalene removal tower. The regeneration medium is designed to be high-temperature steam. The regeneration process is as follows: steam is heated to 400–500°C by an electric heater and then fed into the shut-down naphthalene removal tower at a pressure of 0.02 MPa. The regenerated gas is discharged from the bottom drain pipe of the tower and enters a phenolic water tank, then is released into the air through a vent pipe above the phenolic water tank. During the discharge process, the gas is cooled by water spray.

[0004] Some existing desulfurization towers use packing materials primarily composed of active iron oxide, clay, and sawdust for adsorption, resulting in relatively low strength. This makes them extremely prone to pulverization under friction with coke oven gas flow and long-term use. The pulverized packing powder, along with impurities in the coke oven gas such as tar, naphthalene, and mechanical water, is difficult to remove, leading to poor adsorption. During transport to the naphthalene removal tower via compressor, this powder easily forms a muddy mixture that deposits, causing wear on the compressor cylinder and piston, and adhesion of the intake and exhaust valve plates. This results in frequent compressor maintenance and reduced coke oven gas purification efficiency. Summary of the Invention

[0005] This invention provides a microcrystalline material adsorption device for coking gas purification. It features the beneficial effects of using multiple adsorption components in a staged adsorption process and employing heated adsorption and pressure swing adsorption methods to improve the adsorption and regeneration of coking gas. This solves the problem mentioned in the background art that some existing desulfurization towers use packing materials mainly composed of active iron oxide, clay, and sawdust for adsorption, resulting in low strength. These materials are extremely prone to pulverization under friction with coking gas flow and long-term use. The pulverized packing powder and impurities in the coking gas, such as tar, naphthalene, and mechanical water, are not easily removed, resulting in poor adsorption effect.

[0006] The present invention provides the following technical solution: a microcrystalline material adsorption device for purifying coking coal gas, comprising a feeder, a first distillation column, a second distillation column and a third distillation column connected in sequence;

[0007] The feeder is used to feed coke oven gas, and after rough desulfurization, the coke oven gas is pressurized and enters the first distillation tower.

[0008] The pressurizer and heater are connected to the first distillation column, the second distillation column and the third distillation column through pipelines. The pressurizer is used to pressurize or cool the coke gas during the adsorption process, which is beneficial to the adsorption force of the adsorbate on the adsorbent. The heater is used to heat the coke gas during the adsorption process, which is beneficial to the regeneration of the adsorbent, thus achieving the adsorption separation cycle.

[0009] The first distillation column is used for primary adsorption and desorption, and activated carbon sphere adsorbent is provided inside the first distillation column;

[0010] The second distillation column is used for two-stage adsorption and desorption, and the first distillation column is equipped with iron oxide adsorbent;

[0011] The third distillation column is used for three-stage adsorption and desorption, and a hydrophobic microcrystalline material adsorbent is provided in the third distillation column.

[0012] As an optional embodiment of the microcrystalline material adsorption device for coking coal gas purification described in this invention, it includes a naphthalene removal tower, a compressor, a heater, and a cooling tower.

[0013] The cooling tower is connected to the naphthalene removal tower via a pipeline. The cooling tower is used to regenerate its packing material. The regenerated gas is cooled by the cooling tower to remove more impurities. After being transported to the main coke oven gas network, the impurities condensed in the regenerated gas in the cooling tower are discharged from the bottom of the cooling tower to the phenol water pool.

[0014] The cooling tower is equipped with a spray device and a steam cleaning device.

[0015] As an optional embodiment of the microcrystalline material adsorption device for coking coal gas purification described in this invention, wherein: a first reflux purifier is installed at the outlet end of the first distillation column, and the outlet end of the first reflux purifier is connected to the inlet end of the second distillation column;

[0016] A second reflux purifier is installed at the outlet of the second distillation column, and the outlet of the second reflux purifier is connected to the inlet of the third distillation column.

[0017] The outlet of the third distillation column is equipped with a third reflux purifier, and the outlet of the third reflux purifier is connected to the inlet of the naphthalene removal column.

[0018] As an optional solution of the microcrystalline material adsorption device for coking coal gas purification described in this invention, the first distillation column is provided with three layers of activated carbon from top to bottom. The activated carbon layers are provided with activated carbon microspheres for adsorption, and their volumes are 30%, 50% and 10% of the total volume of the adsorbent, respectively.

[0019] The second distillation column is provided with an iron oxide adsorption layer, an alumina spiked ball layer and an activated carbon fiber layer from top to bottom, and their volumes are 30%, 50% and 20% of the total volume of the adsorbent, respectively.

[0020] The third distillation column is equipped with microcrystalline adsorption material for three-stage adsorption.

[0021] A process for a microcrystalline material adsorption device for purifying coking coal gas includes the following steps:

[0022] Step 1: After the coke oven gas undergoes preliminary desulfurization through the feeder, it is pressurized.

[0023] a) Pressurize the coke oven gas using a pressurizer;

[0024] b) The coke oven gas is heated to 120°C by a heater and then transported to the first distillation column for primary adsorption and descaling.

[0025] Step 2: After the first distillation column performs fine removal, the coke oven gas is transported to the second distillation column for secondary adsorption and fine removal.

[0026] Step 3: After the second distillation column performs fine removal, the coke oven gas is transported to the third distillation column for three-stage adsorption fine removal.

[0027] Step four: The coke oven gas after desulfurization in the third distillation tower is transported to the denaphthalene removal tower via a compressor for desulfurization and denaphthalene regeneration;

[0028] Step 5: After regeneration in the naphthalene removal tower, the gas is cooled in a cooling tower to remove impurities. The condensed impurities in the regenerated gas are discharged from the bottom of the cooling tower to the phenol water pool. The regenerated air is sent to the hot-rolled gas pipeline for recycling.

[0029] As an optional solution of the treatment process of the microcrystalline material adsorption equipment for coking coal gas purification described in this invention, the pressurizer adopts a Roots blower. In step one, after the coking coal gas is subjected to coking coal gas rough desulfurization through the feeder, it is pressurized. When the pressure is increased to 12kPa, it is heated to about 120-130°C by the heater (7) and then sent to the first distillation tower for adsorption regeneration.

[0030] As an optional solution to the processing technology of the microcrystalline material adsorption equipment for coking gas purification described in this invention, step four further includes a cold blowing process before the coking gas is transported to the naphthalene removal tower. The coking gas in the third distillation tower is cold-blown using purified coking gas, so that the outlet temperature of the adsorption bed drops to about 50°C, and the cold blowing ends.

[0031] As an optional solution to the treatment process of the microcrystalline material adsorption device for coking coal gas purification described in this invention, step five further includes a tail gas treatment step for the cooling tower:

[0032] c) Regeneration tail gas process: The regeneration tail gas is rich in hydrogen sulfide and maintains a certain temperature. This part of the tail gas enters the upper section of the gas pipeline of the horizontal tube primary cooler in the blast cooling process and re-enters the cooling tower for packing purification.

[0033] d) Treatment of regenerated tail gas: Due to the low temperature of the regenerated gas during the initial stage of heating and desorption and the final stage of cold blowing, generally below 50°C, while the gas inlet temperature of the horizontal tube primary cooler is 75-85°C, impurities enter the horizontal tube primary cooler with the regenerated gas. As the temperature decreases, the impurities accumulate and block the pipes, affecting the normal regeneration effect. Therefore, circulating oil is added at the point where the gas enters the horizontal tube primary cooler and sprayed through a spray device to avoid the accumulation of impurities.

[0034] e) Condensate treatment during the adsorption process: Some condensate will be generated during the regeneration cold blowing process. This part of the condensate will be collected into the water seal tank to avoid the accumulation of condensate in the pipeline and affect the adsorption effect.

[0035] As an optional solution to the treatment process of the microcrystalline material adsorption device for coking gas purification described in this invention, wherein: in steps one to three, before entering the naphthalene removal tower for regeneration in step four, the H2S in the coking gas is reduced from 896 mg / m³. 3 Reduced to 199 mg / m 3 The removal rate was 77.8%.

[0036] NH3 content from 299 mg / m 3 Reduced to 213 mg / m 3 The removal rate was 28.8%.

[0037] Tar concentration decreased from 1.5 mg / m3 to 0.7 mg / m3, with a removal rate of 53.3%.

[0038] As an optional solution to the treatment process of the microcrystalline material adsorption equipment for coking coal gas purification described in this invention, wherein: after the naphthalene removal tower is regenerated in step four, its H2S decreases from 2171 mg / m³. 3 and 2133mg / m 3 Reduced to 3 mg / m 3 and 9mg / m3 ;

[0039] The removal rates were 99.86% and 99.58%, respectively;

[0040] NH3 content from 252 mg / m³ 3 and 124mg / m 3 Reduced to 148 mg / m 3 and 73mg / m 3 The removal rates were 41.27% and 41.13%, respectively.

[0041] Tar from 1.4 mg / m³ 3 and 1.2 mg / m 3 Reduced to 0.2 mg / m³ 3 The removal rates were 85.71% and 83.33%, respectively.

[0042] The present invention has the following beneficial effects:

[0043] 1. This microcrystalline material adsorption equipment for coking coal gas purification uses three sets of distillation towers with different adsorbents to perform primary, secondary and tertiary adsorption treatment on coking coal gas. It employs selected adsorbent components and uses activated carbon layers, iron oxide adsorption layers, alumina barbed ball layers, activated carbon fiber layers and microcrystalline adsorption materials for adsorption. The adsorption process is further enhanced by heating and pressurizing the coking coal gas with a heater, which improves the adsorption effect of the adsorbent components.

[0044] 2. This microcrystalline material adsorption equipment for coking coal gas purification uses a reflux purifier installed between three distillation towers to reduce changes in coking coal gas concentration and prevent impurity deposition caused by the adsorbent in each distillation tower operating under high load for a long time.

[0045] 3. The treatment process of the microcrystalline material adsorption equipment for coking gas purification, through steps one to five, uses heated adsorption and pressure swing adsorption methods. Different adsorbents of different compositions are placed in the first, second, and third distillation columns to perform primary, secondary, and tertiary staged adsorption treatment of coking gas, thereby improving the adsorption efficiency of coking gas. After regeneration and purification of the coking gas through a naphthalene removal tower and a cooling tower, the tail gas treatment process is completed. This not only improves the flexibility and operability of the device but also reduces the phenomenon of coking gas quality exceeding standards during recovery and reduces secondary environmental pollution caused by emissions due to ineffective adsorption during regeneration. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structural connection process of the present invention.

[0047] Figure 2 This is a schematic diagram of the processing steps of the present invention.

[0048] In the diagram: 1. Feeder; 2. First distillation column; 3. Second distillation column; 4. Third distillation column; 5. Naphthalene removal column; 6. Compressor; 7. Heater; 8. Cooling tower. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] Example 1

[0051] Some existing desulfurization towers use packing materials primarily composed of active iron oxide, clay, and sawdust for adsorption, resulting in relatively low strength. This makes them extremely prone to pulverization under friction with coke oven gas flow and long-term use. The pulverized packing powder, along with impurities in the coke oven gas such as tar, naphthalene, and mechanical water, is difficult to remove, leading to poor adsorption. During transport to the naphthalene removal tower via compressor, this powder easily forms a muddy mixture that deposits, causing wear on the compressor cylinder and piston, and adhesion of the intake and exhaust valve plates. This results in frequent compressor maintenance and reduced coke oven gas purification efficiency.

[0052] The present invention provides the following technical solution: a microcrystalline material adsorption device for purifying coking coal gas, comprising a feeder 1, a first distillation column 2, a second distillation column 3 and a third distillation column 4 connected in sequence;

[0053] Feeder 1 is used to feed coke oven gas and pressurizes the coke oven gas after rough desulfurization before it enters the first distillation column 2;

[0054] The pressurizer 6 and heater 7 are connected to the first distillation column 2, the second distillation column 3 and the third distillation column 4 through pipelines. The pressurizer 6 is used to pressurize or cool the coke gas during the adsorption process, which is beneficial to the adsorption force of the adsorbate on the adsorbent. The heater 7 is used to heat the coke gas during the adsorption process, which is beneficial to the regeneration of the adsorbent, thus achieving the adsorption separation cycle.

[0055] At the same temperature, the amount of adsorbate adsorbed on the adsorbent increases with increasing partial pressure (concentration) of the adsorbate; at the same partial pressure (concentration) of the adsorbate, the amount of adsorbate adsorbed on the adsorbent decreases with increasing adsorption temperature. In other words, increasing pressure or decreasing temperature favors adsorbate adsorption, while decreasing pressure or increasing temperature favors desorption of the adsorbate or regeneration of the adsorbent. Based on the adsorbent regeneration method, adsorption separation cycles are generally classified into two categories: temperature swing adsorption and pressure swing adsorption.

[0056] The first distillation column 2 is used for primary adsorption and descaling, and activated carbon ball adsorbent is installed inside the first distillation column 2.

[0057] The second distillation column 3 is used for secondary adsorption and descaling, and the first distillation column 2 is equipped with iron oxide adsorbent.

[0058] The third distillation column 4 is used for three-stage adsorption and desorption, and is equipped with a hydrophobic microcrystalline material adsorbent.

[0059] In this embodiment, coke oven gas is subjected to primary, secondary, and tertiary staged adsorption treatment by setting adsorbents of different compositions in the first distillation column 2, the second distillation column 3, and the third distillation column 4. The adsorption effect of the adsorbent components is improved by heating and pressurizing the coke oven gas through the heater 7.

[0060] Example 2

[0061] This embodiment is an explanation based on Embodiment 1. For details, please refer to [link / reference]. Figure 1 The components include: 5 naphthalene removal tower, 6 pressurizer, 7 heater, and 8 cooling tower;

[0062] Cooling tower 8 is connected to naphthalene removal tower 5 through a pipeline. Cooling tower 8 is used to regenerate its packing. The regenerated gas is cooled by cooling tower 8 to remove more impurities. After being transported to the main coke oven gas network, the impurities condensed in the regenerated gas in cooling tower 8 are discharged from the bottom of cooling tower 8 to the phenol water pool.

[0063] Cooling tower 8 is equipped with a spray system and a steam cleaning system.

[0064] The existing coke oven gas purification process uses desulfurization towers and naphthalene removal towers. The regeneration medium is designed to be high-temperature steam. Since steam is used as the medium, the steam needs to be cleaned in a cooling tower to remove impurities mixed in the steam and coke oven gas.

[0065] In this embodiment, the packing material is regenerated by the naphthalene removal tower, and then the spray device and steam cleaning device in the cooling tower 8 are used to clean and cool the compounds in the steam and coke oven gas, thereby further improving the adsorption, regeneration and purification effect.

[0066] Example 3

[0067] This embodiment is an explanation based on embodiment 1. Specifically, the outlet end of the first distillation column 2 is equipped with a first reflux purifier, and the outlet end of the first reflux purifier is connected to the inlet end of the second distillation column 3.

[0068] The outlet of the second distillation column 3 is equipped with a second reflux purifier, and the outlet of the second reflux purifier is connected to the inlet of the third distillation column 4.

[0069] The outlet of the third distillation column 4 is equipped with a third reflux purifier, and the outlet of the third reflux purifier is connected to the inlet of the naphthalene removal column 5.

[0070] The reflux purifier is installed on the reflux pipeline between distillation columns. Its function is to capture contaminants generated or introduced into the system before they return to the oil tank. This reduces the concentration of coke oven gas and prevents the concentration from increasing due to reflux.

[0071] In this embodiment, a reflux purifier is installed between the three distillation columns to reduce changes in coke oven gas concentration and prevent impurity deposition caused by the adsorbent in each distillation column operating under high load for a long time.

[0072] Example 4

[0073] This embodiment is an explanation based on Embodiment 1. For details, please refer to [link / reference]. Figure 1 The first distillation column 2 has three layers of activated carbon arranged from top to bottom. The activated carbon layers are made of activated carbon microspheres for adsorption, and their volumes are 30%, 50% and 10% of the total volume of the adsorbent, respectively.

[0074] The second distillation column 3 is provided with an iron oxide adsorption layer, an alumina spiked ball layer and an activated carbon fiber layer from top to bottom, and their volumes are 30%, 50% and 20% of the total volume of the adsorbent, respectively.

[0075] The second distillation column 3 is equipped with microcrystalline adsorption material for tertiary adsorption.

[0076] In this embodiment, the adsorbent components and volumes in the first distillation column 2, the second distillation column 3, and the third distillation column 4 are refined. The degree of adsorbent regeneration determines the product purity and also affects the adsorption capacity of the adsorbent; the regeneration time determines the length of the adsorption cycle and the amount of adsorbent used. Therefore, selecting suitable adsorbent components and employing a regeneration method using activated carbon layers, iron oxide adsorption layers, alumina spiked ball layers, activated carbon fiber layers, and microcrystalline adsorbent materials solves the secondary pollution generated during the regeneration process, significantly extending the service life of the adsorbent and providing substantial economic and environmental benefits.

[0077] Example 5

[0078] This embodiment is an explanation based on Embodiment 1. For details, please refer to [link / reference]. Figure 1-2 A process for a microcrystalline material adsorption device for purifying coking coal gas includes the following steps:

[0079] Step 1: After the coke oven gas undergoes preliminary desulfurization through feeder 1, it is pressurized.

[0080] a. The coke oven gas is pressurized by the pressurizer 6;

[0081] B. The coke oven gas is heated to 120°C by heater 7 and then transported to the first distillation column 2 for primary adsorption and descaling.

[0082] Step 2: After the coke oven gas is purified in the first distillation column 2, it is transported to the second distillation column 3 for secondary adsorption purification.

[0083] Step 3: After the second distillation column 3 performs fine removal, the coke oven gas is transported to the third distillation column 4 for three-stage adsorption fine removal.

[0084] Step 4: The coke oven gas after desulfurization in the third distillation column 4 is transported to the naphthalene removal column 5 via a compressor for desulfurization and naphthalene removal regeneration;

[0085] Step 5: After regeneration, the naphthalene removal tower 5 is cooled by cooling tower 8 to remove impurities. The condensed impurities in the regenerated gas are discharged from the bottom of cooling tower 8 to the phenol water pool. The regenerated air is sent to the hot-rolled gas pipeline for recycling.

[0086] As an optional solution of the treatment process of the microcrystalline material adsorption equipment for coking coal gas purification of the present invention, the pressurizer 6 adopts a Roots blower. In step one, after the coking coal gas is subjected to coking coal gas rough desulfurization through the feeder 1, it is pressurized. When the pressure is increased to 12kPa, it is heated to about 120-130°C by the heater 7 and then sent to the first distillation column 2 for adsorption regeneration.

[0087] Step four also includes a cold blowing process before the coke oven gas is transported to the denaphthalene removal tower 5. The coke oven gas in the third distillation tower 4 is cold-blown using purified coke oven gas, so that the outlet temperature of the adsorption bed drops to about 50°C, and the cold blowing ends.

[0088] Step five also includes the exhaust gas treatment step for cooling tower 8.

[0089] C) Regeneration tail gas process: The regeneration tail gas is rich in hydrogen sulfide and maintains a certain temperature. This part of the tail gas enters the upper section of the gas pipeline of the horizontal tube primary cooler in the blast cooling process and re-enters the cooling tower 8 for packing purification.

[0090] D) Treatment of regenerated tail gas: Due to the low temperature of the regenerated gas during the initial stage of heating and desorption and the final stage of cold blowing, generally below 50°C, while the gas inlet temperature of the horizontal tube primary cooler is 75-85°C, impurities enter the horizontal tube primary cooler with the regenerated gas. As the temperature decreases, the impurities accumulate and block the pipes, affecting the normal regeneration effect. Therefore, circulating oil is added at the point where the gas enters the horizontal tube primary cooler and sprayed through a spray device to avoid the accumulation of impurities.

[0091] e) Condensate treatment during the adsorption process: Some condensate will be generated during the regeneration cold blowing process. This part of the condensate will be collected into the water seal tank to avoid the accumulation of condensate in the pipeline and affect the adsorption effect.

[0092] In this embodiment: the process steps are explained. In steps one to five, the coke oven gas is subjected to primary, secondary and tertiary staged adsorption treatment by using heated adsorption and pressure swing adsorption methods, and by setting adsorbents of different compositions in the first distillation column 2, the second distillation column 3 and the third distillation column 4. This improves the adsorption efficiency of the coke oven gas.

[0093] The process of regenerating and purifying coking gas through denaphthalene removal tower 5 and cooling tower 8, followed by tail gas treatment, not only improves the flexibility and operability of the unit, but also reduces the phenomenon of excessive coking gas quality recovery, and reduces secondary environmental pollution caused by the ineffective adsorption of regenerated gas.

[0094] Example 6

[0095] This embodiment is an explanation based on Embodiment 1. For details, please refer to [link / reference]. Figure 1-2 In steps one through three, before entering the naphthalene removal tower 5 for regeneration in step four, the H2S in the coking gas is reduced from 896 m³ / s. 3 Reduced to 199 mg / m 3 The removal rate was 77.8%.

[0096] NH3 content from 299 mg / m 3 Reduced to 213 mg / m 3 The removal rate was 28.8%.

[0097] Tar concentration decreased from 1.5 mg / m3 to 0.7 mg / m3, with a removal rate of 53.3%.

[0098] As an optional solution to the treatment process of the microcrystalline material adsorption device for coking coal gas purification of the present invention, wherein: after the regeneration of the naphthalene removal tower 5 in step four, its H2S decreases from 2171 mg / m³ 3 and 2133mg / m 3 Reduced to 3 mg / m 3 and 9mg / m 3 ;

[0099] The removal rates were 99.86% and 99.58%, respectively;

[0100] NH3 content from 252 mg / m³ 3 and 124mg / m 3 Reduced to 148 mg / m 3 and 73mg / m 3The removal rates were 41.27% and 41.13%, respectively.

[0101] Tar from 1.4 mg / m³ 3 and 1.2 mg / m 3 Reduced to 0.2 mg / m³ 3 The removal rates were 85.71% and 83.33%, respectively.

[0102] In this embodiment, the content of coking coal gas in the experimental process was tested. Compared with the data before regeneration, the removal rate and adsorption rate were significantly improved, solving the problem of poor adsorption effect before regeneration.

[0103] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0104] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A microcrystalline material adsorption device for purifying coking coal gas, characterized in that: It includes a feeder (1), a first distillation column (2), a second distillation column (3) and a third distillation column (4) connected in sequence; The feeder (1) is used to feed coke oven gas and pressurizes the coke oven gas after rough desulfurization before it enters the first distillation tower (2). It also includes a pressurizer (6), and the pressurizer (6) and heater (7) are connected to the first distillation column (2), the second distillation column (3) and the third distillation column (4) through pipelines. The pressurizer (6) is used to pressurize or cool the coke gas during the adsorption process, which is beneficial to the adsorption force of the adsorbate on the adsorbent. The heater (7) is used to heat the coke gas during the adsorption process, which is beneficial to the regeneration of the adsorbent, thus achieving the adsorption separation cycle process. The first distillation column (2) is used for primary adsorption and desorption, and activated carbon sphere adsorbent is provided inside the first distillation column (2); The second distillation column (3) is used for secondary adsorption and desorption, and the first distillation column (2) is equipped with iron oxide adsorbent; The third distillation column (4) is used for three-stage adsorption and desorption, and the third distillation column (4) is equipped with a hydrophobic microcrystalline material adsorbent. The first distillation column (2) is equipped with a first reflux purifier at its outlet end, and the outlet end of the first reflux purifier is connected to the inlet end of the second distillation column (3). The outlet end of the second distillation column (3) is equipped with a second reflux purifier, and the outlet end of the second reflux purifier is connected to the inlet end of the third distillation column (4); The outlet end of the third distillation column (4) is equipped with a third reflux purifier, and the outlet end of the third reflux purifier is connected to the inlet end of the naphthalene removal column (5). The first distillation column (2) is provided with three layers of activated carbon from top to bottom. The activated carbon layers are made of activated carbon microspheres for adsorption, and their volumes are 30%, 50% and 10% of the total volume of the adsorbent, respectively. The second distillation column (3) is provided with an iron oxide adsorption layer, an alumina spiked ball layer and an activated carbon fiber layer from top to bottom, and their volumes are 30%, 50% and 20% of the total volume of the adsorbent, respectively. The third distillation column (4) is equipped with microcrystalline adsorption material for three-stage adsorption; The processing technology of the microcrystalline material adsorption equipment for coking coal gas purification includes the following steps: Step 1: After the coke oven gas is subjected to coarse desulfurization by the feeder (1), it is pressurized; a) The coke oven gas is pressurized by a pressurizer (6); B), the coke oven gas is heated by heater (7) to a temperature of 120°C, and then transported to the first distillation column (2) for primary adsorption and descaling; Step 2: After the first distillation column (2) performs fine removal, the coke oven gas is transported to the second distillation column (3) for secondary adsorption fine removal; Step 3: After the second distillation column (3) performs fine removal, the coke oven gas is transported to the third distillation column (4) for three-stage adsorption fine removal; Step 4: The coke oven gas after desulfurization in the third distillation column (4) is transported to the denaphthalene removal column (5) by a compressor for desulfurization and denaphthalene regeneration; Step 5: After the naphthalene removal tower (5) is regenerated, it is cooled by the cooling tower (8) to remove impurities. The impurities after the regenerated gas are condensed and discharged from the bottom of the cooling tower (8) to the phenol water pool. The regenerated air is sent into the hot-rolled gas pipeline for recycling. In steps one through three, before entering the naphthalene removal tower (5) for regeneration in step four, the H2S in the coke gas is reduced from 896 m³ / s. 3 Reduced to 199 mg / m 3 The removal rate was 77.8%; NH3 content from 299 mg / m 3 Reduced to 213 mg / m³ 3 The removal rate was 28.8%; Tar concentration decreased from 1.5 mg / m³ to 0.7 mg / m³, with a removal rate of 53.3%. In step four, after the naphthalene removal tower (5) is regenerated, its H2S decreases from 2171 mg / m³. 3 and 2133mg / m 3 Reduced to 3 mg / m 3 and 9mg / m 3 ; The removal rates were 99.86% and 99.58%, respectively; NH3 content from 252 mg / m³ 3 and 124mg / m 3 Reduced to 148 mg / m 3 and 73mg / m 3 The removal rates were 41.27% and 41.13%, respectively. Tar from 1.4 mg / m³ 3 and 1.2 mg / m 3 Reduced to 0.2 mg / m³ 3 The removal rates were 85.71% and 83.33%, respectively.

2. The microcrystalline material adsorption device for coking coal gas purification according to claim 1, characterized in that: It also includes a naphthalene removal tower (5), a heater (7), and a cooling tower (8); The cooling tower (8) is connected to the naphthalene removal tower (5) through a pipeline. The cooling tower (8) is used to regenerate its packing. The regenerated gas is cooled by the cooling tower (8) to remove more impurities. After being transported to the main coke oven gas pipeline, the impurities condensed in the regenerated gas in the cooling tower (8) are discharged from the bottom of the cooling tower (8) to the phenol water pool. The cooling tower (8) is equipped with a spray device and a steam cleaning device.

3. The microcrystalline material adsorption device for coking coal gas purification according to claim 1, characterized in that: The pressurizer (6) uses a Roots blower. In step one, the coke oven gas is subjected to coke oven gas rough desulfurization through the feeder (1) and then pressurized. When the pressure is increased to 12 kPa, it is heated to 120-130°C by the heater (7) and then transported to the first distillation column (2) for adsorption and regeneration.

4. The microcrystalline material adsorption device for coking coal gas purification according to claim 1, characterized in that: Step four also includes a cold blowing process before the coke oven gas is transported to the denaphthalene tower (5). The coke oven gas in the third distillation tower (4) is cold blown by the purified coke oven gas, so that the outlet temperature of the adsorption bed drops to 50°C and the cold blowing ends.

5. The microcrystalline material adsorption device for coking coal gas purification according to claim 1, characterized in that: Step five also includes a tail gas treatment step for the cooling tower (8): c), the regenerated tail gas process, the regenerated tail gas is rich in hydrogen sulfide and maintains a certain temperature. This part of the tail gas enters the upper section of the gas pipeline of the horizontal tube primary cooler of the blast cooling process and re-enters the cooling tower (8) for packing purification. d) Regeneration tail gas treatment: During the initial stage of heating and desorption and the final stage of cold blowing, the regeneration gas temperature is below 50°C, while the gas inlet temperature of the horizontal tube primary cooler is 75~85°C. Impurities enter the horizontal tube primary cooler with the regeneration gas. As the temperature decreases, impurities accumulate and block the pipes, affecting the normal regeneration effect. Therefore, circulating oil is added at the point where the gas enters the horizontal tube primary cooler and sprayed through a spray device to avoid the accumulation of impurities. e) Condensate treatment during the adsorption process: Some condensate will be generated during the regeneration cold blowing process. This part of the condensate will be collected into the water seal tank to avoid the accumulation of condensate in the pipeline and affect the adsorption effect.

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