Dry-process fine desulfurization integrated device for synthesis gas

Abstract

The utility model relates to the technical field of synthesis gas dry-process fine desulfurization, in particular to a synthesis gas dry-process fine desulfurization integrated device which comprises a desulfurization tower, an input end at the top of the desulfurization tower is connected with a sulfur-containing synthesis gas pipeline, an output end at the lower end of the desulfurization tower is connected with a desulfurizer fixed bed layer tower, and a screen mesh layer is arranged in the desulfurizer fixed bed layer tower. An Al2O3 particle bed layer is arranged above the screen mesh layer, an organic sulfur hydrolytic agent bed layer is arranged above the Al2O3 particle bed layer, a zinc oxide desulfurizer bed layer is arranged above the organic sulfur hydrolytic agent bed layer, the upper end of the desulfurizer fixed bed layer tower is connected with the input end of a slurry discharge pump, and a spray head communicated with the screen mesh layer is arranged below the screen mesh layer. A gas filter and a heat system are arranged on one side of the desulfurizing agent fixed bed tower, and the output ends of the gas filter and the heat system are connected with the nozzles. Through the integrated design of the tower and the tank, the process is simplified, the equipment structure is optimized, the device investment is reduced, and inorganic sulfur can be removed while organic sulfur in the synthesis gas is removed, so that the total sulfur content is less than 0.1 ppm.

Description

Technical Field

[0001] This utility model relates to the field of dry desulfurization technology of syngas, specifically to an integrated device for dry desulfurization of syngas. Background Technology

[0002] Coal gasification is an important way to achieve clean and efficient utilization of coal. However, sulfur impurities in coal inevitably generate gaseous sulfides during the gasification process, mainly inorganic hydrogen sulfide. H2S is a colorless, corrosive, highly toxic acidic gas with a rotten egg odor. It not only corrodes pipelines and equipment but also harms human health. Effective removal of H2S is a crucial step in coal gas desulfurization. Desulfurization methods generally include dry desulfurization and wet desulfurization. Wet desulfurization is generally used in the coarse desulfurization stage, handling gases with large volumes and high sulfur content. Dry desulfurization is generally used for fine desulfurization, requiring a desulfurization accuracy of less than 0.1 ppm. Wet desulfurization is a technology that uses specific liquid-phase desulfurizing agents to separate and wash away sulfides in coal gas. It is characterized by handling gases with large volumes and high sulfur content and is suitable for coal gas. Coarse desulfurization; there are many dry desulfurization methods, such as activated carbon method, molecular sieve method, metal oxidation method, etc., each with different characteristics; desulfurization adsorbents: mainly metal oxides (ZnO, Fe2O3), activated carbon, molecular sieves, etc.; fine desulfurization refers to the purification process of syngas. It involves first hydrolyzing the organic sulfur and unsaturated hydrocarbons in the syngas after low-temperature methanol washing into H2S and saturated hydrocarbons using an organic sulfur hydrolysant, and then treating them with iron oxide and zinc oxide catalysts to remove sulfides to below 0.1 ppm. In the fine desulfurization process, appropriate desulfurizing agents are required, including room-temperature zinc oxide (ZnO) desulfurizing agents and COS hydrolysants. In addition, the reaction temperature, pressure, and flow rate during the desulfurization reaction process must be controlled to achieve the best desulfurization effect.

[0003] The current desulfurization process for syngas suffers from problems such as incomplete desulfurization leading to reduced desulfurization efficiency and catalyst poisoning in methanol synthesis. This is detrimental to improving desulfurization efficiency and achieving comprehensive resource utilization and cost savings.

[0004] Based on this, we now provide an integrated dry desulfurization unit for syngas, which can eliminate the drawbacks of existing units. Utility Model Content

[0005] To address the aforementioned issues, an integrated dry desulfurization unit for syngas is provided. By adopting an integrated design, the process is simplified and the equipment structure is optimized, solving the problems of incomplete syngas desulfurization leading to reduced desulfurization efficiency and catalyst poisoning in methanol synthesis.

[0006] To address the problems of existing technologies, this utility model provides an integrated dry desulfurization device for syngas, comprising a desulfurization tower. The top input end of the desulfurization tower is connected to a sulfur-containing syngas pipeline, and the lower output end of the desulfurization tower is connected to a desulfurizing agent fixed bed tower. The desulfurizing agent fixed bed tower has a wire mesh layer inside, an Al2O3 particle bed above the wire mesh layer, an organic sulfur hydrolysate bed above the Al2O3 particle bed, and a zinc oxide desulfurizing agent bed above the organic sulfur hydrolysate bed. The upper end of the desulfurizing agent fixed bed tower is connected to the input end of a slurry discharge pump, and a nozzle connected to the wire mesh layer is located below the wire mesh layer. A gas filter and a thermal system are located on one side of the desulfurizing agent fixed bed tower, and the output end of the gas filter and thermal system is connected to the nozzle.

[0007] Preferably, the nozzles are installed in the desulfurizing agent fixed bed tower, and there are three layers of nozzles, each of which is equipped with a desulfurization circulation pump.

[0008] Preferably, the desulfurization tower inlet is equipped with a heat exchange device and a filter.

[0009] Preferably, the organic sulfur hydrolysate bed and the zinc oxide desulfurizer bed are equipped with temperature detection devices.

[0010] The advantages of this utility model compared to the prior art are:

[0011] This invention simplifies the process and optimizes the equipment structure through an integrated tower and trough design, reducing equipment investment. It removes inorganic sulfur while removing organic sulfur from syngas, resulting in a total sulfur content of less than 0.1 ppm. Furthermore, real-time monitoring allows for control of the water content and reaction temperature in the syngas, adjusting the desulfurization effect. It also achieves comprehensive resource utilization, with no by-products or secondary pollution. Apart from power consumption, there is no consumption or loss of raw materials, resulting in low overall investment and operating costs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a syngas dry desulfurization integrated unit.

[0013] The diagram is labeled as follows: 1. Sulfur-containing syngas pipeline; 2. Desulfurization tower; 3. Gas filter and thermal system; 4. Slurry discharge pump; 5. Nozzle; 6. Wire mesh layer; 7. Al2O3 particle bed; 8. Organic sulfur hydrolysate bed; 9. Zinc oxide desulfurizing agent bed; 10. Desulfurizing agent fixed bed tower. Detailed Implementation

[0014] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0015] Reference Figure 1 A dry desulfurization integrated device for syngas includes a desulfurization tower 2. The top input end of the desulfurization tower 2 is connected to a sulfur-containing syngas pipeline 1. The lower output end of the desulfurization tower 2 is connected to a desulfurizing agent fixed bed tower 10. The desulfurizing agent fixed bed tower 10 has a wire mesh layer 6 inside. Above the wire mesh layer 6 is an Al2O3 particle bed 7. Above the Al2O3 particle bed 7 is an organic sulfur hydrolysate bed 8. Above the organic sulfur hydrolysate bed 8 is a zinc oxide desulfurizing agent bed 9. The upper end of the desulfurizing agent fixed bed tower 10 is connected to the input end of a slurry discharge pump 4. Below the wire mesh layer 6 is a nozzle 5 connected to it. A gas filter and a thermal system 3 are provided on one side of the desulfurizing agent fixed bed tower 10. The output end of the gas filter and thermal system 3 is connected to the nozzle 5.

[0016] A wire mesh 6 and an Al2O3 particle bed 7 are installed in the desulfurization tower 2 to remove droplets and particulate matter larger than 0.01μm in the flue gas. This can improve the efficiency of demisting and dust removal. The demisting efficiency can be as high as 95% or more, and the efficiency of removing micro dust and aerosols is over 90%.

[0017] Reference Figure 1 The nozzle 5 is installed inside the desulfurizing agent fixed bed tower 10. There are three layers of nozzle 5, and each nozzle 5 is equipped with a desulfurization circulation pump.

[0018] The nozzles 5 are arranged to ensure uniform spatial distribution. Through the optimized design of the slurry distribution pipeline, the spray volume of nozzles 5 at different positions is made uniform, so that the flue gas and slurry can be evenly distributed and short-circuiting of flue gas can be avoided as much as possible, thus ensuring desulfurization efficiency. Each layer of nozzles 5 in the desulfurization tower 2 is equipped with a desulfurization circulation pump for easy adjustment, and each layer of nozzles 5 can be controlled independently. The nozzles 5 are made of nozzles with good atomization effect, large flow channels that are not easy to clog, and wear-resistant.

[0019] Reference Figure 1 The desulfurization tower 2 is equipped with a heat exchange device and a filter at its inlet.

[0020] The main function of the heat exchange device is to regulate the temperature of the flue gas entering the desulfurization tower 2. Since the desulfurization reaction has certain temperature requirements, excessively high or low temperatures may affect the desulfurization efficiency. Through the heat exchange device, the flue gas can be adjusted to a suitable reaction temperature, thereby improving the desulfurization efficiency. In addition, the heat exchange device also helps to recover the heat energy in the flue gas, realize energy reuse, and reduce production costs. Secondly, the filter is mainly used to remove impurities and particulate matter from the flue gas. These impurities and particulate matter may include dust, soot, oil mist, etc., which not only affect the desulfurization effect, but may also cause corrosion and blockage to the equipment and pipes inside the desulfurization tower 2. Through the filtration effect of the filter, these impurities and particulate matter can be effectively removed, ensuring the cleanliness and unobstructed flow inside the desulfurization tower 2, thereby extending the service life of the equipment.

[0021] Reference Figure 1 The organic sulfur hydrolysate bed 8 and the zinc oxide desulfurizer bed 9 are equipped with temperature detection devices.

[0022] An organic sulfur hydrolysate bed 8 and a zinc oxide desulfurizer bed 9 are set in the desulfurization tower 2 to remove organic and inorganic sulfur from the synthesis gas, so that the total sulfur content is less than 0.1 ppm. A temperature detection device is set up to control and monitor the tail gas desulfurization process in real time.

[0023] Working principle: Syngas sequentially enters the desulfurizing agent fixed bed tower 10 through sulfur-containing syngas pipeline 1 and desulfurization tower 2, and then passes through nozzles 5, wire mesh layer 6, Al2O3 granular bed 7, organic sulfur hydrolysate bed 8, and zinc oxide desulfurizing agent bed 9, finally being discharged through slurry discharge pump 4. The wire mesh layer 6 and Al2O3 granular bed 7 remove droplets and particulate matter larger than 0.01μm from the flue gas, thus improving the efficiency of demisting and dust removal. The demisting efficiency can reach over 95%, and the efficiency of removing micro-dust and aerosols is over 90%. The nozzles 5 are arranged to ensure uniform spatial distribution. Through optimized design of the slurry distribution pipeline, the spray volume of nozzles 5 at different positions is uniform, ensuring uniform distribution of flue gas and slurry and minimizing short-circuiting of flue gas, thus guaranteeing desulfurization efficiency. Each layer within the desulfurization tower 2... Each nozzle 5 is equipped with an individual desulfurization circulation pump for easy adjustment, and each layer of nozzles 5 can be individually controlled for spraying. The nozzles 5 use nozzles with good atomization effect, large flow channels that are not easy to clog, and wear resistance. The organic sulfur hydrolysate bed 8 and the zinc oxide desulfurizer bed 9 remove organic and inorganic sulfur from the syngas, making the total sulfur content less than 0.1 ppm. The temperature detection device is set up to control and monitor the tail gas desulfurization process in real time. Through the integrated tower and tank design, the process is simplified, the equipment structure is optimized, and the investment of the equipment is reduced. It can remove inorganic sulfur while removing organic sulfur from the syngas, making the total sulfur content less than 0.1 ppm. Moreover, through real-time monitoring, the water content in the syngas and the reaction temperature can be controlled to adjust the desulfurization effect, and at the same time, the comprehensive utilization of resources is realized.

[0024] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. An integrated dry desulfurization unit for syngas, characterized in that, The system includes a desulfurization tower (2), the top input end of which is connected to a sulfur-containing syngas pipeline (1), the lower output end of which is connected to a desulfurizing agent fixed bed tower (10), the desulfurizing agent fixed bed tower (10) is provided with a wire mesh layer (6) inside, an Al2O3 particle bed layer (7) is provided above the wire mesh layer (6), an organic sulfur hydrolysate bed layer (8) is provided above the Al2O3 particle bed layer (7), a zinc oxide desulfurizing agent bed layer (9) is provided above the organic sulfur hydrolysate bed layer (8), the upper end of the desulfurizing agent fixed bed tower (10) is connected to the input end of a slurry discharge pump (4), a nozzle (5) is provided below the wire mesh layer (6) and communicates with it, and a gas filter and a heat system (3) are provided on one side of the desulfurizing agent fixed bed tower (10), the output end of the gas filter and heat system (3) is connected to the nozzle (5).

2. The integrated dry desulfurization unit for syngas according to claim 1, characterized in that, The nozzle (5) is installed in the desulfurizing agent fixed bed tower (10). The nozzle (5) has three layers and each nozzle (5) is equipped with a desulfurization circulation pump.

3. The integrated dry desulfurization unit for syngas according to claim 1, characterized in that, The desulfurization tower (2) is equipped with a heat exchange device and a filter at its inlet.

4. The integrated dry desulfurization unit for syngas according to claim 1, characterized in that, The organic sulfur hydrolysate bed (8) and the zinc oxide desulfurizer bed (9) are equipped with temperature detection devices.

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