Coke oven gas fine desulfurization system

Abstract

The utility model provides a coke oven gas fine desulfurization system which comprises a coke oven gas inlet pipeline, a front inorganic sulfur adsorption tower, a gas heater, an organic sulfur hydrolysis tower, a gas cooler, a first inorganic sulfur adsorption tower and a coke oven clean gas outlet pipeline, a gas outlet pipeline of the front inorganic sulfur adsorption tower is connected with a gas inlet of the gas heater, a gas outlet pipeline of the gas heater is connected with a gas inlet of the organic sulfur hydrolysis tower, a gas outlet pipeline of the organic sulfur hydrolysis tower is connected with a gas inlet of the gas cooler, and a gas outlet pipeline of the gas cooler is connected with a gas inlet end of the first inorganic sulfur adsorption tower; and a gas outlet end pipeline of the first inorganic sulfur adsorption tower is connected with a gas inlet end of the coke oven clean gas outlet pipeline. The device can be used for further removing inorganic sulfur and organic sulfur in coke oven gas desulfurized by a wet method, so that the emission requirement of atmospheric pollutants is met.

Description

Technical Field

[0001] The utility model relates to the technical field of coke oven gas purification, in particular to the technical field of fine desulfurization of coke oven gas, and specifically refers to a fine desulfurization system for coke oven gas. Background Technique

[0002] Coking coal contains hundreds of components under complex geological conditions. Therefore, the composition of raw coke oven gas is very complex. The function of the gas purification device is to remove the main impurities in the raw gas according to the requirements of various users for gas quality and the requirements of national environmental protection standards.

[0003] The existing gas desulfurization often adopts the wet desulfurization process. Commonly used are the HPF desulfurization process, the PDS desulfurization process, and the enhanced ammonia-sulfur circulation method desulfurization process. After desulfurization by the former two, the hydrogen sulfide content in the gas is not more than 200 mg / m 3 , and the latter is the optimized AS desulfurization process. After treatment, the hydrogen sulfide content in the gas can meet the requirement of not more than 100 mg / m 3 . However, these methods only remove the inorganic sulfur in the gas and have basically no desulfurization effect on the organic sulfur in the gas.

[0004] Compared with the wet desulfurization, the dry desulfurization technology has a high desulfurization and purification degree (the hydrogen sulfide purification index is not more than 10 mg / m 3 ), and the operation is simple and reliable. However, limited by the sulfur capacity of the desulfurizer, for gas users with high requirements for hydrogen sulfide, the dry and wet desulfurization technologies can be used as complements. First, use the wet desulfurization technology to remove most of the hydrogen sulfide, and then use the dry desulfurization to finely desulfurize the inorganic sulfur and organic sulfur in the gas to reach the desulfurization accuracy of PPM level. With the improvement of national environmental protection requirements, it is necessary to further finely desulfurize the coke oven gas after wet desulfurization of existing enterprises to meet the emission requirements of air pollutants.

[0005] Therefore, it is desired to provide a fine desulfurization system for coke oven gas, which can further remove the inorganic sulfur and organic sulfur in the coke oven gas after wet desulfurization and meet the emission requirements of air pollutants. Content of the Utility Model

[0006] In order to overcome the above-mentioned shortcomings in the prior art, an object of the utility model is to provide a fine desulfurization system for coke oven gas, which can further remove the inorganic sulfur and organic sulfur in the coke oven gas after wet desulfurization, meet the emission requirements of air pollutants, and is suitable for large-scale popularization and application.

[0007] To achieve the above object, the utility model provides a fine desulfurization system for coke oven gas, which is characterized by including a coke oven gas inlet pipeline, a pre-inorganic sulfur adsorption tower, a gas heater, an organic sulfur hydrolysis tower, a gas cooler, a first inorganic sulfur adsorption tower, and a coke oven clean gas outlet pipeline, wherein:

[0008] The outlet pipeline of the coke oven gas inlet pipeline is connected to the inlet of the front inorganic sulfur adsorption tower. The outlet pipeline of the front inorganic sulfur adsorption tower is connected to the inlet of the gas heater. The outlet pipeline of the gas heater is connected to the inlet of the organic sulfur hydrolysis tower. The outlet pipeline of the organic sulfur hydrolysis tower is connected to the inlet of the gas cooler. The outlet pipeline of the gas cooler is connected to the inlet end of the first inorganic sulfur adsorption tower. The outlet pipeline of the first inorganic sulfur adsorption tower is connected to the inlet end of the coke oven clean gas outlet pipeline.

[0009] Preferably, the front inorganic sulfur adsorption tower is an activated carbon adsorption tower.

[0010] More preferably, activated carbon adsorbent is provided in the activated carbon adsorption tower.

[0011] Preferably, a hydrolysis agent is provided in the organic sulfur hydrolysis tower.

[0012] More preferably, the hydrolysis agent is alumina particles loaded with an alkali promoter.

[0013] Preferably, a first inorganic sulfur desulfurizer is provided in the first inorganic sulfur adsorption tower.

[0014] More preferably, the first inorganic sulfur desulfurizer is an iron oxide desulfurizer or a molecular sieve adsorbent.

[0015] Preferably, the coke oven gas fine desulfurization system further includes a second inorganic sulfur adsorption tower, a regenerated gas inlet pipeline, a regenerated gas driving device, a regenerated heater, a regenerated cooler, and a regenerated gas outlet pipeline, wherein:

[0016] The second inorganic sulfur adsorption tower and the first inorganic sulfur adsorption tower are arranged in parallel. The outlet of the gas cooler is also connected to the inlet end of the second inorganic sulfur adsorption tower by a pipeline. The outlet pipeline of the second inorganic sulfur adsorption tower is connected to the inlet end of the coke oven clean gas outlet pipeline. The position of the coke oven clean gas outlet pipeline between the inlet end and the outlet end of the coke oven clean gas outlet pipeline is connected to the inlet end of the regenerated gas inlet pipeline by a pipeline. The outlet pipeline of the regenerated gas inlet pipeline is connected to the inlet of the regenerated gas driving device. The outlet of the regenerated gas driving device is connected to the inlet of the regenerated heater. The outlet of the regenerated heater is respectively connected to the outlet end of the second inorganic sulfur adsorption tower and the outlet end of the first inorganic sulfur adsorption tower by pipelines. The inlet ends of the first inorganic sulfur adsorption tower and the second inorganic sulfur adsorption tower are both connected to the inlet of the regenerated cooler by pipelines. The outlet pipeline of the regenerated cooler is connected to the inlet end of the regenerated gas outlet pipeline.

[0017] Preferably, a second inorganic sulfur desulfurizer is provided inside the second inorganic sulfur adsorption tower.

[0018] Furthermore, the second inorganic sulfur desulfurizer is an iron oxide desulfurizer or a molecular sieve adsorbent.

[0019] The beneficial effects of the present utility model mainly lie in:

[0020] The fine desulfurization system for coke oven gas of the present utility model includes a coke oven gas inlet pipeline, a front inorganic sulfur adsorption tower, a gas heater, an organic sulfur hydrolysis tower, a gas cooler, a first inorganic sulfur adsorption tower, and a coke oven clean gas outlet pipeline. The outlet end of the coke oven gas inlet pipeline is connected to the inlet of the front inorganic sulfur adsorption tower through a pipeline. The outlet of the front inorganic sulfur adsorption tower is connected to the inlet of the gas heater through a pipeline. The outlet of the gas heater is connected to the inlet of the organic sulfur hydrolysis tower through a pipeline. The outlet of the organic sulfur hydrolysis tower is connected to the inlet of the gas cooler through a pipeline. The outlet of the gas cooler is connected to the inlet end of the first inorganic sulfur adsorption tower through a pipeline. The outlet end of the first inorganic sulfur adsorption tower is connected to the inlet end of the coke oven clean gas outlet pipeline through a pipeline. Therefore, it can further remove inorganic sulfur and organic sulfur in the coke oven gas after wet desulfurization, meet the emission requirements of air pollutants, and is suitable for large-scale popularization and application.

[0021] These and other objects, features, and advantages of the present utility model are fully embodied through the following detailed description and drawings, and can be realized by the means, devices, and their combinations specifically pointed out in the utility model content. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of a specific embodiment of the fine desulfurization system for coke oven gas of the present utility model.

[0023] (Symbol Explanation)

[0024] 1 Coke oven gas inlet pipeline; 2 Front inorganic sulfur adsorption tower; 3 Gas heater; 4 Organic sulfur hydrolysis tower; 5 Gas cooler; 6 First inorganic sulfur adsorption tower; 7 Coke oven clean gas outlet pipeline; 8 Second inorganic sulfur adsorption tower; 9 Regenerated gas inlet pipeline; 10 Regenerated gas driving device; 11 Regenerated heater; 12 Regenerated cooler; 13 Regenerated gas outlet pipeline. Detailed Embodiment

[0025] In order to be able to more clearly understand the technical content of the present utility model, the following embodiments are specifically cited for detailed description.

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0027] Please refer to Figure 1 As shown, in a specific embodiment of the present utility model, the fine desulfurization system for coke oven gas of the present utility model includes a coke oven gas inlet pipeline 1, a pre-inorganic sulfur adsorption tower 2, a gas heater 3, an organic sulfur hydrolysis tower 4, a gas cooler 5, a first inorganic sulfur adsorption tower 6, and a coke oven clean gas outlet pipeline 7, where:

[0028] The outlet end of the coke oven gas inlet pipeline 1 is connected to the inlet of the pre-inorganic sulfur adsorption tower 2 through a pipeline, the outlet of the pre-inorganic sulfur adsorption tower 2 is connected to the inlet of the gas heater 3 through a pipeline, the outlet of the gas heater 3 is connected to the inlet of the organic sulfur hydrolysis tower 4 through a pipeline, the outlet of the organic sulfur hydrolysis tower 4 is connected to the inlet of the gas cooler 5 through a pipeline, the outlet of the gas cooler 5 is connected to the inlet end of the first inorganic sulfur adsorption tower 6 through a pipeline, and the outlet end of the first inorganic sulfur adsorption tower 6 is connected to the inlet end of the coke oven clean gas outlet pipeline 7 through a pipeline.

[0029] The pre-inorganic sulfur adsorption tower 2 can be any suitable inorganic sulfur adsorption tower. In a specific embodiment of the present utility model, the pre-inorganic sulfur adsorption tower 2 is an activated carbon adsorption tower.

[0030] Activated carbon adsorbent can be provided inside the activated carbon adsorption tower, or it can be not provided first and then provided when installing or using the activated carbon adsorption tower. In a specific embodiment of the present utility model, activated carbon adsorbent is provided inside the activated carbon adsorption tower.

[0031] Hydrolyzing agent can be provided inside the organic sulfur hydrolysis tower 4, or it can be not provided first and then provided when installing or using the organic sulfur hydrolysis tower 4. In a specific embodiment of the present utility model, hydrolyzing agent is provided inside the organic sulfur hydrolysis tower 4.

[0032] The hydrolyzing agent can be any suitable hydrolyzing agent. Preferably, the hydrolyzing agent is alumina particles loaded with alkali auxiliaries. In a specific embodiment of the present utility model, the alumina particles loaded with alkali auxiliaries are alumina particles SCDS-02 (Shanghai ShengSheng Chemical Technology Co., Ltd.).

[0033] A first inorganic sulfur desulfurization agent may be provided in the first inorganic sulfur adsorption tower 6, or it may not be provided initially and instead be provided when installing or using the first inorganic sulfur adsorption tower 6. In a specific embodiment of the present invention, a first inorganic sulfur desulfurization agent is provided in the first inorganic sulfur adsorption tower 6.

[0034] The first inorganic sulfur desulfurization agent may be any suitable inorganic sulfur desulfurization agent. More preferably, the first inorganic sulfur desulfurization agent is an iron oxide desulfurization agent or a molecular sieve adsorbent. In a specific embodiment of the present invention, the first inorganic sulfur desulfurization agent is an iron oxide desulfurization agent.

[0035] The fine desulfurization system for coke oven gas may further include any other suitable components. Please refer to Figure 1 as shown. In a specific embodiment of the present invention, the fine desulfurization system for coke oven gas further includes a second inorganic sulfur adsorption tower 8, a regenerated gas inlet pipe 9, a regenerated gas driving device 10, a regenerated heater 11, a regenerated cooler 12, and a regenerated gas outlet pipe 13, where:

[0036] The second inorganic sulfur adsorption tower 8 and the first inorganic sulfur adsorption tower 6 are arranged in parallel. The outlet of the gas cooler 5 is also connected to the inlet end of the second inorganic sulfur adsorption tower 8 through a pipeline. The outlet end of the second inorganic sulfur adsorption tower 8 is connected to the inlet end of the coke oven clean gas outlet pipe 7 through a pipeline. A position between the inlet end and the outlet end of the coke oven clean gas outlet pipe 7 of the coke oven clean gas outlet pipe 7 is connected to the inlet end of the regenerated gas inlet pipe 9 through a pipeline. The outlet end of the regenerated gas inlet pipe 9 is connected to the inlet of the regenerated gas driving device 10 through a pipeline. The outlet of the regenerated gas driving device 10 is connected to the inlet of the regenerated heater 11 through a pipeline. The outlet of the regenerated heater 11 is respectively connected to the outlet end of the second inorganic sulfur adsorption tower 8 and the outlet end of the first inorganic sulfur adsorption tower 6 through pipelines. The inlet ends of the first inorganic sulfur adsorption tower 6 and the second inorganic sulfur adsorption tower 8 are both connected to the inlet of the regenerated cooler 12 through pipelines. The outlet of the regenerated cooler 12 is connected to the inlet end of the regenerated gas outlet pipe 13 through a pipeline.

[0037] A second inorganic sulfur desulfurization agent may be provided in the second inorganic sulfur adsorption tower 8, or it may not be provided initially and instead be provided when installing or using the second inorganic sulfur adsorption tower 8. In a specific embodiment of the present invention, a second inorganic sulfur desulfurization agent is provided in the second inorganic sulfur adsorption tower 8.

[0038] The second inorganic sulfur desulfurizer can be any suitable inorganic sulfur desulfurizer. Further, the second inorganic sulfur desulfurizer is an iron oxide desulfurizer or a molecular sieve adsorbent. In a specific embodiment of the present invention, the second inorganic sulfur desulfurizer is a molecular sieve adsorbent SXDS-03 (Shanghai Shengsheng Chemical Technology Co., Ltd.).

[0039] The regeneration gas driving device 10 can be any suitable gas driving device. In a specific embodiment of the present invention, the regeneration gas driving device 10 is a regeneration blower.

[0040] The following Figure 1 specifically describes the process steps of the fine desulfurization system for coke oven gas of the present invention:

[0041] The coke oven gas after wet desulfurization in the coking plant (i.e., the coke oven gas to be desulfurized) first enters the front inorganic sulfur adsorption tower 2 through the coke oven gas inlet pipe 1 to further remove inorganic sulfur and the like in the gas. The coke oven gas at the outlet of the front inorganic sulfur adsorption tower 2 contains no more than 20 mg / m of hydrogen sulfide 3 . After the initially desulfurized coke oven gas is sent to the gas heater 3 and heated to 120°C to 160°C, it enters the organic sulfur hydrolysis tower 4 for hydrolyzing and removing organic sulfur, and the organic sulfur removal rate is greater than 90%. The coke oven gas at the outlet of the organic sulfur hydrolysis tower 4 is at 120°C to 160°C and is cooled to 30°C to 50°C by the gas cooler 5 and then enters the first inorganic sulfur adsorption tower 6 for adsorption. In the first inorganic sulfur adsorption tower 6, inorganic sulfur and other impurities in the gas are removed, and the purified coke oven gas enters the coke oven clean gas outlet pipe 7.

[0042] The first inorganic sulfur adsorption tower 6 and the second inorganic sulfur adsorption tower 8 are arranged in parallel, one for adsorption and one for regeneration. After the first inorganic sulfur adsorption tower 6 is saturated with adsorption, the gas cooled to 30°C to 50°C by the gas cooler 5 enters the second inorganic sulfur adsorption tower 8 for adsorption. In the second inorganic sulfur adsorption tower 8, inorganic sulfur and other impurities in the gas are removed, and the purified coke oven gas enters the coke oven clean gas outlet pipe 7. And the purified coke oven gas is led out from the coke oven clean gas outlet pipe 7 and enters the regeneration gas inlet pipe 9, passes through the regeneration gas driving device 10, and enters the regeneration heater 11 for preheating, so that the temperature of the purified coke oven gas reaches above 200°C, which is used to regenerate the saturated first inorganic sulfur adsorption tower 6. The regenerated coke oven gas is sent to the regeneration gas outlet pipe 13 through the regeneration cooler 12.

[0043] Application Example 1

[0044] Adopt Figure 1 the specific embodiment shown and the foregoing working process to treat the coke oven gas after wet desulfurization in a certain coking plant. The treatment capacity is 100,000 Nm 3 / h, and its specific technical operation indexes and results are shown in Table 1.

[0045] Application Example 2

[0046] Adopt Figure 1 The specific embodiments shown and the foregoing work flow are used to treat the coke oven gas after wet desulfurization in a certain coking plant, and the treatment capacity is 50,000 Nm 3 / h, and the specific technical operation indexes and results are shown in Table 1.

[0047] Table 1

[0048]

[0049]

[0050] Note: The above organic sulfur contents are calculated based on H2S as the benchmark.

[0051] In the above two application examples, the hydrogen sulfide content in the desulfurized gas is less than 10 mg / Nm 3 , and the organic sulfur content is less than 10 mg / Nm 3 .

[0052] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0053] 1. By setting the front inorganic sulfur adsorption tower, the present utility model can further remove inorganic sulfur, naphthalene, tar, etc. in the coke oven gas after wet desulfurization, which is beneficial to extending the service life of the subsequent hydrolysis agent and adsorbent.

[0054] 2. By setting the organic sulfur hydrolysis tower, the removal rate of organic sulfur hydrolysis in the coke oven gas is greater than 90%.

[0055] 3. The present utility model converts the organic sulfur in the gas into inorganic sulfur through the organic sulfur hydrolysis tower, and then further removes the inorganic sulfur through the first inorganic sulfur adsorption tower or the second inorganic sulfur adsorption tower, so that the inorganic sulfur content at the outlet of the coke oven gas is not greater than 10 mg / m 3 , and the organic sulfur content is not greater than 10 mg / m 3 .

[0056] 4. The process of the present utility model is simple and convenient to operate, and can be used as supplementary fine desulfurization of the coke oven gas after wet desulfurization in existing enterprises to meet the requirements of the existing atmospheric pollutant discharge standards.

[0057] Therefore, by adopting the present utility model to carry out fine desulfurization on the coke oven gas after wet desulfurization, the inorganic sulfur content at the outlet of the coke oven gas is not greater than 10 mg / Nm 3 , and the organic sulfur content is not greater than 10 mg / Nm 3 , and after combustion, it can meet the enterprise's atmospheric pollutant sulfur dioxide discharge standard.

[0058] In summary, the fine desulfurization system for coke oven gas of the present utility model can further remove inorganic sulfur and organic sulfur in the coke oven gas after wet desulfurization, meet the emission requirements of air pollutants, and is suitable for large-scale popularization and application.

[0059] Thus, the object of the present utility model has been fully and effectively achieved. The functions and structural principles of the present utility model have been demonstrated and described in the embodiments. Without departing from the above principles, the implementation manners can be modified arbitrarily. Therefore, the present utility model includes all variant implementation manners based on the spirit and scope of the claims.

Claims

1. A coke oven gas fine desulfurization system, characterized in that: It includes the coke oven gas inlet pipeline, the front inorganic sulfur adsorption tower, the gas heater, the organic sulfur hydrolysis tower, the gas cooler, the first inorganic sulfur adsorption tower and the coke oven clean gas outlet pipeline, among which: The gas outlet pipeline of the coke oven gas inlet pipeline is connected to the air inlet of the front inorganic sulfur adsorption tower, the gas outlet pipeline of the front inorganic sulfur adsorption tower is connected to the air inlet of the gas heater, the gas outlet pipeline of the gas heater is connected to the air inlet of the organic sulfur hydrolysis tower, the gas outlet pipeline of the organic sulfur hydrolysis tower is connected to the air inlet of the gas cooler, the gas outlet pipeline of the gas cooler is connected to the air inlet end of the first inorganic sulfur adsorption tower, and the gas outlet pipeline of the first inorganic sulfur adsorption tower is connected to the air inlet end of the coke oven clean gas outlet pipeline.

2. The coke oven gas fine desulfurization system according to claim 1, characterized in that: The front inorganic sulfur adsorption tower is an activated carbon adsorption tower.

3. The coke oven gas fine desulfurization system according to claim 2, characterized in that: An activated carbon adsorbent is arranged in the activated carbon adsorption tower.

4. The coke oven gas fine desulfurization system according to claim 1, characterized in that: A hydrolyzing agent is arranged in the organic sulfur hydrolysis tower.

5. The coke oven gas fine desulfurization system according to claim 4, characterized in that: The hydrolyzing agent is alumina particles loaded with an alkali auxiliary agent.

6. The coke oven gas fine desulfurization system according to claim 1, characterized in that: The first inorganic sulfur adsorption tower is provided with a first inorganic sulfur desulfurizing agent.

7. The coke oven gas fine desulfurization system according to claim 6, characterized in that: The first inorganic sulfur desulfurizing agent is an iron oxide desulfurizing agent or a molecular sieve adsorbent.

8. The coke oven gas fine desulfurization system according to claim 1, characterized in that: The coke oven gas fine desulfurization system further includes a second inorganic sulfur adsorption tower, a regeneration gas inlet pipeline, a regeneration gas driving device, a regeneration heater, a regeneration cooler and a regeneration gas outlet pipeline, wherein: The second inorganic sulfur adsorption tower and the first inorganic sulfur adsorption tower are arranged in parallel, the gas outlet of the gas cooler is also connected to the gas inlet end of the second inorganic sulfur adsorption tower through a pipeline, the gas outlet end of the second inorganic sulfur adsorption tower is connected to the gas inlet end of the coke oven clean gas outlet pipeline through a pipeline, the position of the coke oven clean gas outlet pipeline located between the gas inlet end of the coke oven clean gas outlet pipeline and the gas outlet end of the coke oven clean gas outlet pipeline is connected to the gas inlet end of the regeneration gas inlet pipeline, and the gas outlet end of the regeneration gas inlet pipeline A pipeline is connected to the air inlet of the regeneration gas driving device, and the air outlet pipeline of the regeneration gas driving device is connected to the air inlet of the regeneration heater. The air outlet of the regeneration heater is respectively connected to the air outlet end of the second inorganic sulfur adsorption tower and the air outlet end of the first inorganic sulfur adsorption tower by pipelines. The air inlet end of the first inorganic sulfur adsorption tower and the air inlet end of the second inorganic sulfur adsorption tower are both connected to the air inlet of the regeneration cooler by pipelines, and the air outlet pipeline of the regeneration cooler is connected to the air inlet end of the regeneration coal gas outlet pipeline.

9. The coke oven gas fine desulfurization system according to claim 8, characterized in that: A second inorganic sulfur desulfurizing agent is arranged in the second inorganic sulfur adsorption tower.

10. The coke oven gas fine desulfurization system according to claim 9, characterized in that: The second inorganic sulfur desulfurizing agent is an iron oxide desulfurizing agent or a molecular sieve adsorbent.

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