Coal gas desulfurization hydrolysis pretreatment system and reaction tower

Abstract

The utility model discloses a coal gas desulfurization hydrolysis pretreatment system and reaction tower, including tower body, in the tower body is provided with pretreatment section and hydrolysis section from bottom to top, pretreatment section includes fixed bed and gas inlet, the fixed bed is filled with filler, hydrolysis section includes hydrolysis module and gas outlet, the hydrolysis module comprises a plurality of hydrolysis units arranged from top to bottom, and the hydrolysis units are of honeycomb structures. The hydrolysis unit is designed into a honeycomb structure, so that the efficiency of converting organic sulfur COS into inorganic sulfur H2S is greatly improved, the use amount of the hydrolysis agent is greatly reduced, the service life of the hydrolysis agent is prolonged, and the fine desulfurization cost of the coal gas is reduced.

Description

Technical Field

[0001] This utility model relates to the field of coal gas desulfurization technology, and more specifically, to a coal gas desulfurization hydrolysis pretreatment system and reaction tower. Background Technology

[0002] Dry hydrolysis and desulfurization after TRT is currently a widely used, reliable, and stable desulfurization process for blast furnace gas. Since the sulfides in blast furnace gas are mainly organic sulfur compounds such as COS, which are difficult to remove, they need to be converted into inorganic sulfur (H2S) through catalytic hydrolysis before they can be effectively absorbed and removed. Traditional dry COS hydrolysis processes mostly use small spherical hydrolysis catalysts, but these catalysts have a relatively low space velocity (800-1000 h⁻¹). -1 This results in a large amount of hydrolysing agent being used, low flow rate in the hydrolysis reactor, large equipment size, large footprint, high project investment, and high system operating resistance, which is not conducive to gas transportation applications. In addition, small spherical hydrolysing agents are prone to pulverization, deactivation, and short service life, resulting in frequent replacement of hydrolysing agents in fine desulfurization projects, leading to extremely high operating costs. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a coal gas desulfurization and hydrolysis pretreatment system with low operating resistance.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a reaction tower, comprising a tower body, wherein a pretreatment section and a hydrolysis section are arranged from bottom to top within the tower body, the pretreatment section comprising a fixed bed and an air inlet, the fixed bed being filled with packing material, the hydrolysis section comprising a hydrolysis module and an air outlet, the hydrolysis module comprising a plurality of hydrolysis units arranged from top to bottom, the hydrolysis unit having a honeycomb structure.

[0005] Furthermore, the hydrolysis unit is composed of multiple hydrolysants, each with a length of 600-900 mm.

[0006] Furthermore, the packing width of the packing is 600-900mm.

[0007] Furthermore, the top of the reaction tower is provided with a hoisting port corresponding to the location of the hydrolysis section.

[0008] Furthermore, a discharge port is provided at the bottom of the pretreatment section.

[0009] Furthermore, a flow guide grille is provided on the side of the hydrolysis module.

[0010] Furthermore, the fixed bed is provided with a flow guide grille on its side.

[0011] This embodiment also provides a coal gas desulfurization and hydrolysis pretreatment system, including a reaction tower, the gas inlet of which is connected to a coal gas heater, the coal gas heater is connected to a blind valve, the blind valve is connected to a butterfly valve, and the butterfly valve is connected to an expansion valve.

[0012] In summary, this utility model has the following beneficial effects:

[0013] 1. This utility model has a simple structure, small amount of hydrolysant, significant treatment effect, small footprint, low amount of hydrolysant, long service life, convenient replacement, and low operation and maintenance cost.

[0014] 2. The organic sulfur COS hydrolysis tower and the pretreatment tower are combined into one tower, and the hydrolysis and pretreatment are integrated, thereby saving the amount of steel structure and reducing the construction cost of the fine desulfurization project.

[0015] 3. The hydrolysate can be quickly installed or replaced using the hoisting equipment at the top of the reaction tower, reducing the time and workload of hydrolysate replacement and minimizing downtime required for hydrolysate replacement, thus demonstrating high economic efficiency and practicality.

[0016] 4. The hydrolysis unit is designed with a honeycomb structure, which greatly improves the efficiency of converting organic sulfur (COS) into inorganic sulfur (H2S). This significantly reduces the amount of hydrolysing agent used, extends the service life of the hydrolysing agent, and lowers the cost of coal gas desulfurization. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a coal gas desulfurization and hydrolysis pretreatment system;

[0018] Figure 2 This is a schematic diagram of the reaction tower structure;

[0019] Figure 3 This is a schematic diagram of the structure at the top of the reaction tower;

[0020] Figure 4 This is a cross-sectional view of the air inlet of the reaction tower;

[0021] Figure 5 This is a schematic diagram of the structure at the connection between the pretreatment section and the hydrolysis section;

[0022] Figure 6 This is a schematic diagram of the hydrolysis unit.

[0023] Figure 7 This is a schematic diagram of the structure of the hydrolysate;

[0024] Reference numerals: reaction tower 100, tower body 110, hoisting port 111, hydrolysis section 120, gas outlet 121, hydrolysis unit 122, support frame 123, hydrolyzing agent 124, micropores 125, pretreatment section 130, gas inlet 131, discharge port 132, flow guide grid 140, wire mesh 141, packing 142, feed pipe 143, gas heater 200, blind valve 300, butterfly valve 400, expansion valve 500. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] See Figures 1 to 7 This embodiment discloses a reaction tower 100, including a tower body 110. The tower body 110 has a pretreatment section 130 and a hydrolysis section 120 arranged from bottom to top. The pretreatment section 130 includes a fixed bed and an inlet 131. The fixed bed is filled with packing material. The hydrolysis section 120 includes a hydrolysis module and an outlet 121. The hydrolysis module includes multiple hydrolysis units 122 arranged from top to bottom, and the hydrolysis units 122 have a honeycomb structure. This method can effectively convert organic sulfur (COS) to inorganic sulfur (H2S), while significantly increasing the space velocity of the hydrolysate, thereby significantly reducing the amount of hydrolysate used.

[0027] Capable of handling 200,000 Nm 3 In the design of the reaction tower 100 for producing sulfur-containing coal gas per hour, the dimensions of the reaction tower 100 are as follows: The hydrolysis section 120 is 10m high, and the hydrolysis modules are designed in groups of 8. The top of the reaction tower 100 has 8 rectangular lifting holes to allow the hydrolysis modules to be installed into the reaction tower 100 via the top lifting device. When replacing the hydrolysis modules, they can also be easily lifted out through the lifting holes at the top of the tower. Each group of hydrolysis modules consists of 4 hydrolysis units 122 stacked vertically. Each hydrolysis unit 122 includes a support frame 123, within which 96 rod-shaped hydrolysate 124 are arranged in a 6*16 pattern. Each hydrolysate 124 has multiple micropores 125, thus forming a honeycomb structure. The hydrolysate 124 is made of alumina, and the design dimensions of a single hydrolysate 124 are 150mm*150mm*900mm. The design space velocity of the hydrolysate 124 is 4000 h⁻¹. -1 Total usage approximately 50m 3The hydrolysis module is equipped with flow guide grilles 140 on both sides to ensure uniform gas flow into and out of the hydrolysis module. The designed gas flow rate for the hydrolysate 124 is about 1 m / s. The COS hydrolysis conversion rate is over 95%, and the gas pressure difference on both sides of the hydrolysate is less than 300 Pa.

[0028] The honeycomb structure makes the pore size of the airflow channels within the hydrolysis module much larger than the gaps between the original small spherical hydrolysants. This prevents dust and water accumulation within the channels, and the thin channel walls allow the hydrolysant to contact the sulfur-containing gas with a large specific surface area. Thus, under conditions of high space velocity and flow rate, a small amount of hydrolysant can achieve efficient conversion of organic sulfur. Because each hydrolysis module has a high-strength steel outer frame, the hydrolysant within the reaction tower 100 will not experience compression or breakage throughout its entire life cycle, thereby avoiding situations where the reaction tower resistance increases dramatically due to hydrolysant breakage, forcing the replacement of the hydrolysant.

[0029] To protect the hydrolysis section 120, a pretreatment section 130 corresponding to each hydrolysis module is designed at the lower part of the reaction tower 100. The pretreatment section includes guide grilles 140 on both sides, with wire mesh 141 between the blades of the guide grilles 140, and a funnel-shaped structure at the bottom of the guide grilles 140. The funnel-shaped structure and wire mesh 141 form a fixed bed. A feed pipe 143 for conveying packing material 142 is provided above the fixed bed. The fixed bed is filled with packing material 142, the main component of which is calcium hydroxide. Gas enters from both sides of the pretreatment section 130 at the lower part of the reaction tower 100, passes through the fixed bed, ascends to the middle channel of the tower, and then enters the hydrolysis section 120. The guide grilles 140 ensure uniform airflow into and out of the fixed bed, allowing for full contact with the packing material. The fixed beds are filled with packing material, with a packing width of approximately 900 mm. The two fixed beds together contain approximately 200 tons of packing material. The designed gas flow rate in the pretreatment section 130 is approximately 0.5 m / s. The chlorine removal rate in the pretreatment section 130 is over 90%, and the gas pressure difference in the pretreatment section 130 is less than 1000 Pa. The overall resistance of the reaction tower 100 is less than 1500 Pa.

[0030] The funnel-shaped structure has a discharge port 132 at its bottom, which can be opened to empty the packing in the fixed bed when needed. Considering the special nature of the gas, the discharge port 132 is designed inside the tower to ensure that the gas does not leak out; a manhole is also designed at the bottom of the tower to facilitate the entry and exit of personnel or materials.

[0031] This embodiment also provides a coal gas desulfurization and hydrolysis pretreatment system, including a reaction tower 100, a coal gas heater 200 connected to the gas inlet 131 of the reaction tower 100, a blind valve 300 connected to the coal gas heater 200, a butterfly valve 400 connected to the blind valve 300, and an expansion valve 500 connected to the butterfly valve 400.

[0032] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A reaction tower, characterized in that, The system includes a tower body (110), which has a pretreatment section (130) and a hydrolysis section (120) arranged from bottom to top. The pretreatment section (130) includes a fixed bed and an air inlet (131). The fixed bed is filled with packing material. The hydrolysis section (120) includes a hydrolysis module and an air outlet (121). The hydrolysis module includes multiple hydrolysis units (122) arranged from top to bottom. The hydrolysis unit (122) has a honeycomb structure.

2. The reaction tower according to claim 1, characterized in that, The hydrolysis unit (122) is composed of multiple hydrolysants (124), each hydrolysant (124) having a length of 600-900 mm.

3. A reaction tower according to claim 1, characterized in that, The packing width of the packing material is 600-900mm.

4. A reaction tower according to claim 1, characterized in that, The top of the reaction tower (100) is provided with a lifting port (111) corresponding to the position of the hydrolysis section (120).

5. A reaction tower according to claim 1, characterized in that, The pretreatment section (130) is provided with an outlet (132) at its bottom.

6. A reaction tower according to claim 1, characterized in that, The hydrolysis module is provided with a flow guide grille (140) on its side.

7. A reaction tower according to claim 1, characterized in that, The fixed bed is provided with a flow guide grille (140) on its side.

8. A coal gas desulfurization hydrolysis pretreatment system, characterized in that, Includes the reaction tower (100) as described in any one of claims 1-7.

9. A coal gas desulfurization hydrolysis pretreatment system according to claim 8, characterized in that, The gas inlet (131) of the reaction tower (100) is connected to a gas heater (200), the gas heater (200) is connected to a blind valve (300), the blind valve (300) is connected to a butterfly valve (400), and the butterfly valve (400) is connected to an expansion valve (500).

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