阅读说明：本技术 一种用于脱除焦炉煤气中硫化氢的系统 (System for removing hydrogen sulfide in coke oven gas ) 是由 陈佳 郭华 姜茂贵 何水 于 2019-01-31 设计创作，主要内容包括：一种用于脱除焦炉煤气中硫化氢的系统,包括旋流雾幕吸收塔,转轴穿过所述旋流雾幕吸收塔,通过传动机构与变频电机同步转动,转轴上固定有若干层甩液桶单元,每层甩液桶单元设有多个甩液桶,进液管穿过所述旋流雾幕吸收塔内壁延伸至甩液桶和环形筛网盘上方；富液槽与所述旋流雾幕吸收塔的排液口相连通,贫液槽与所述进液管连通,初冷器与所述旋流雾幕吸收塔的进气口连通,除雾器连通所述旋流雾幕吸收塔的排气口,甩液桶使贫液形成均相雾幕与焦炉煤气接触传质,吸收H<Sub>2</Sub>S。本发明的脱除硫化氢的系统结构简单,脱硫效率高,脱硫塔体积小,处理量大。(A system for removing hydrogen sulfide in coke oven gas comprises a rotational flow fog curtain absorption tower, a rotating shaft penetrates through the rotational flow fog curtain absorption tower and synchronously rotates with a variable frequency motor through a transmission mechanism, a plurality of layers of liquid throwing barrel units are fixed on the rotating shaft, each layer of liquid throwing barrel unit is provided with a plurality of liquid throwing barrels, and a liquid inlet pipe penetrates through the inner wall of the rotational flow fog curtain absorption tower and extends to the positions above the liquid throwing barrels and an annular screen disc; the rich liquor tank is communicated with a liquor outlet of the rotational flow fog curtain absorption tower, the lean liquor tank is communicated with the liquor inlet pipe, the primary cooler is communicated with a gas inlet of the rotational flow fog curtain absorption tower, the demister is communicated with a gas outlet of the rotational flow fog curtain absorption tower, and the lean liquor forms a homogeneous fog curtain to contact with coke oven gas for mass transfer by the liquid throwing barrel to absorb H 2 And S. The system for removing the hydrogen sulfide has the advantages of simple structure, high desulfurization efficiency, small size of the desulfurization tower and large treatment capacity.)

1. A system for removing hydrogen sulfide in coke oven gas is characterized by comprising a rotational flow fog curtain absorption tower, wherein a rotating shaft penetrates through the rotational flow fog curtain absorption tower and synchronously rotates with a variable frequency motor through a transmission mechanism, a plurality of layers of liquid throwing barrel units are fixed on the rotating shaft, each layer of liquid throwing barrel unit is provided with a plurality of liquid throwing barrels, the inner wall of the rotational flow fog curtain absorption tower corresponding to the liquid throwing barrel units is connected with an annular screen disc, the liquid throwing barrel units are far away, an annular channel is formed between the annular screen disc and the liquid throwing barrel units, and a liquid inlet pipe penetrates through the inner wall of the rotational flow fog curtain absorption tower and extends to the positions above the liquid throwing barrels and the annular screen disc; the rich liquor tank is communicated with a liquor discharge port of the cyclone fog curtain absorption tower, the lean liquor tank is communicated with the liquor inlet pipe, the primary cooler is communicated with an air inlet of the cyclone fog curtain absorption tower, the demister is communicated with an air outlet of the cyclone fog curtain absorption tower, and the rotating speed of a liquid throwing barrel in the cyclone fog curtain absorption tower is 600-3000 rpm.

2. The system for removing hydrogen sulfide in coke oven gas as claimed in claim 1, the cyclone fog curtain absorption tower is provided with two layers of liquid throwing barrel units, an annular screen disc corresponds to the lower portion of the outer side of each layer of liquid throwing barrel unit, the annular screen discs are connected with the inner wall of the cyclone fog curtain absorption tower through liquid collecting annular grooves, a plurality of liquid discharge pipes penetrate through the inner wall of the cyclone fog curtain absorption tower and are communicated to the lower portion of each layer of annular liquid collecting groove, one end of a cooler sequentially passes through a washing pump and a first liquid discharge pipe to be communicated with a first annular liquid collecting groove, the other end of the cooler conveys cooling barren liquid to the second liquid throwing barrel unit through a third liquid inlet pipe, the barren liquid groove conveys the barren liquid to the first liquid throwing barrel unit and the first annular screen disc through the first liquid inlet pipe, the residual ammonia water groove conveys residual ammonia water containing tar to the second annular screen disc through a fourth liquid inlet pipe, and the rich liquid groove is communicated with the second.

3. The system for removing the hydrogen sulfide in the coke oven gas as claimed in any one of claims 1 or 2, wherein a barren liquid pump is arranged on a liquid inlet pipe between the barren liquid pump and the cyclone fog curtain absorption tower.

4. The system for removing hydrogen sulfide in coke oven gas according to any one of claims 1 or 2, wherein the rich liquid tank is connected with the regeneration tank through a rich liquid pump, and an outlet pipeline of the regeneration tank is connected with the lean liquid tank.

5. The system for removing hydrogen sulfide in coke oven gas as claimed in any one of claims 1 or 2, wherein a plurality of the liquid throwing barrels are concentrically arranged and sequentially arranged in a step shape from top to bottom, the liquid throwing barrels are arranged at equal intervals on each layer, the diameters of the liquid throwing barrels are increased at equal intervals, the bottom plate of the liquid throwing barrel on the lower layer is connected with the lower side of the bottom plate of the liquid throwing barrel on the upper layer, triangular prism blocks are uniformly distributed on the upper side of the bottom plate of each liquid throwing barrel along the circumferential direction, eyelets are uniformly distributed on the barrel wall of each liquid throwing barrel close to the upper edge, the diameter of each eyelet is 0.5-1 mm, and the density is 39²。

6. The system for removing hydrogen sulfide in coke oven gas as claimed in any one of claims 1 or 2, wherein the annular screen plate is uniformly distributed with screen holes, the diameter of each screen hole is 1-1.5 mm, and the density is 39200-59200/m²And the inner edge of the annular screen disc is provided with a surrounding sheet.

7. The system for removing hydrogen sulfide in coke oven gas as claimed in claim 2, wherein the inner edge of the second annular screen disc is close to the second liquid throwing unit, and the second annular screen disc is inclined from outside to inside to the bottom of the swirling mist curtain absorption tower to form a slope.

8. The system for removing hydrogen sulfide in coke oven gas as claimed in any one of claims 1 or 2, wherein the third liquid inlet pipe is also communicated with a lean liquid tank.

Technical Field

The invention relates to the field of chemical equipment, in particular to a system for removing hydrogen sulfide in coke oven gas.

Background

Removing hydrogen sulfide component in industrial gasSulfur treatment, the current wet desulfurization which is widely applied, mainly adopts the traditional packed tower equipment to absorb hydrogen sulfide. The tower equipment of the technology has large volume, large investment of the device, large liquid circulation volume, high air resistance, inconvenient start and stop and high equipment operation cost, for example, the patent technology developed by German Steiner company, A-S method for short, liquid phase flows from top to bottom by a gravitational field, so the thickness, the liquid speed and the retention time of the liquid phase are low, and H is caused₂S and CO₂And at the same time, the alkali is absorbed, so that the utilization rate of the alkali is greatly reduced. So as to reach H₂The discharge standard of S requires that the turbulence of a liquid film is reduced, and tower equipment is increased.

The rotary packed bed developed by the Liu intelligent team utilizes the high-speed rotary packing to generate a supergravity environment, the height of the mass transfer unit can be reduced by 1-2 orders of magnitude, the mass transfer efficiency is enhanced, and the production intensity of unit equipment volume is improved by 1-2 orders of magnitude. But is still not suitable for desulfurizing the coke oven gas treated in the primary cooling section of the coke-oven plant, and the coke oven gas contains 20-50 mg/m of tar³30 to 40g/m of a benzene hydrocarbon³Naphthalene precipitates can be generated in the process of removing hydrogen sulfide to block the filler, and the mass transfer efficiency is reduced.

Disclosure of Invention

The invention aims to provide a rotary desulfurizing tower with an optimized structure, which improves the efficiency of removing hydrogen sulfide in coke oven gas treated in the primary cooling section of a coke-oven plant, reduces resistance, reduces the space of the tower and reduces investment.

The technical scheme adopted by the invention is that the system for removing hydrogen sulfide in coke oven gas comprises a rotational flow fog curtain absorption tower, a rotating shaft penetrates through the rotational flow fog curtain absorption tower and synchronously rotates with a variable frequency motor through a transmission mechanism, a plurality of layers of liquid throwing barrel units are fixed on the rotating shaft, each layer of liquid throwing barrel unit is provided with a plurality of liquid throwing barrels, the inner wall of the rotational flow fog curtain absorption tower corresponding to the liquid throwing barrel units is connected with an annular screen disc, the inner wall of the rotational flow fog curtain absorption tower is far away from the liquid throwing barrel units, an annular channel is formed between the annular screen disc and the liquid throwing barrel units, and a liquid inlet pipe penetrates through the inner wall of the rotational flow fog curtain absorption tower and extends to the positions above the liquid throwing barrels and the annular screen disc; the rich liquor tank is communicated with a liquor discharge port of the cyclone fog curtain absorption tower, the lean liquor tank is communicated with the liquor inlet pipe, the primary cooler is communicated with an air inlet of the cyclone fog curtain absorption tower, the demister is communicated with an air outlet of the cyclone fog curtain absorption tower, and the rotating speed of a liquid throwing barrel in the cyclone fog curtain absorption tower is 600-3000 rpm.

Preferably, the cyclone fog curtain absorption tower is provided with two layers of liquid throwing barrel units, an annular screen disc corresponds to the lower portion of the outer side of each layer of liquid throwing barrel unit, the annular screen discs are connected with the inner wall of the cyclone fog curtain absorption tower through liquid collecting annular grooves, a plurality of liquid discharge pipes penetrate through the inner wall of the cyclone fog curtain absorption tower and are communicated to the lower portion of each layer of annular liquid collecting groove, one end of a cooler is communicated with a first annular liquid collecting groove through a washing pump and a first liquid discharge pipe in sequence, the other end of the cooler is used for conveying cooling barren liquid to the second liquid throwing barrel unit through a third liquid inlet pipe, the barren liquid groove is used for conveying barren liquid to the first liquid throwing barrel unit and the first annular screen disc through the first liquid inlet pipe, the residual ammonia water groove is used for conveying residual ammonia water containing tar to the second annular screen disc through a fourth liquid inlet pipe, and the rich liquid.

And further, a barren liquor pump is arranged on a liquor inlet pipe between the barren liquor pump and the swirling flow fog curtain absorption tower.

Furthermore, the rich liquid tank is connected with the regeneration tank through a rich liquid pump, and an outlet pipeline of the regeneration tank is connected with the lean liquid tank.

Preferably, a plurality of the liquid throwing barrels are concentrically arranged and are sequentially arranged in a ladder shape from top to bottom, the liquid throwing barrels are arranged at equal intervals at each layer, the diameters of the liquid throwing barrels are increased in an equal interval mode, the liquid throwing barrel bottom plate at the lower layer is connected with the lower side of the liquid throwing barrel bottom plate at the upper layer, triangular prism blocks are evenly distributed on the upper side of the bottom plate of each liquid throwing barrel along the circumferential direction, holes are evenly distributed on the wall of each liquid throwing barrel close to the upper edge, the diameter of each hole is 0.5-1 mm, and the density of each hole²。

Preferably, the annular screen plate is uniformly distributed with screen holes, the diameter of each screen hole is 1-1.5 mm, and the density is 39200-59200 pieces/m²And the inner edge of the annular screen disc is provided with a surrounding sheet.

Furthermore, the inner edge of the second annular screen disc is close to the second liquid throwing unit, and the second annular screen disc inclines from outside to inside towards the bottom of the cyclone fog curtain absorption tower to form a slope.

Further, the third liquid inlet pipe is also communicated with a lean liquid tank.

Compared with a rotary packed bed desulfurization tower, the desulfurization tower provided by the technical scheme provided by the invention has the following advantages: 1. the liquid inlet pipe of the desulfurization tower is different from the liquid inlet pipe of the desulfurization tower, but passes through the tower wall to directly convey barren solution to a liquid throwing barrel or an annular screen disc, and the liquid inlet structure is simple; 2. in the invention, the barren solution is thrown out by a liquid throwing barrel and atomized into a fog curtain, and the fog curtain is contacted with two phases of coke oven gas flowing upwards for mass transfer, the diameter of atomized liquid drops is 1-50 mu m, and the contact area of the mass transfer is larger than that of a liquid film formed in a rotating packed bed; 3. the lean solution fog curtain is in a homogeneous phase and is contacted with the coke oven gas for mass transfer, and the two phases are contacted uniformly; 4. absorption of H₂The liquid drops after S are thrown to the tower wall or an annular screen plate, and a liquid film formed on the annular screen plate is contacted with the coke oven gas passing through the screen holes for mass transfer; 5. the desulfurizing tower is not provided with a packing layer, and the coke oven gas and the fog curtain carry out mass transfer, so that the resistance is smaller, and the height and the volume of the desulfurizing tower are reduced; 6. the system is provided with two layers of liquid throwing barrel units, two layers of annular screen disks and an annular liquid collecting tank, wherein one strand of barren liquid is thrown into a fog curtain by the first liquid throwing barrel unit and then absorbs H₂S, the temperature rises, the lean solution is conveyed to a cooler through an annular liquid collecting groove and a first liquid discharging pipe on the wall of the collision tower to be cooled, and then the lean solution is conveyed to a second liquid throwing barrel unit again to form a fog curtain for mass transfer again, the other lean solution is distributed on a first annular screen disc through a second liquid inlet pipe to be mixed with high-temperature fog curtain liquid drops collected on the first annular screen disc, the temperature of the mixed solution is reduced, and H in the low-temperature lean solution is cooled₂S has a much lower saturated vapor and absorbs H₂The efficiency of S is higher, the mixed liquor after cooling is mixed with the barren liquor and sent into a second liquid throwing barrel unit, and H in the mixed liquor is reduced₂The concentration of S improves the mass transfer efficiency of the fog curtain thrown out by the second liquid throwing barrel unit and the coke oven gas, the second annular liquid collecting tank is used for collecting rich liquid, the residual ammonia water containing tar is distributed to the second annular screen disc to prevent naphthalene in the coke oven gas from generating precipitate and washing out the naphthalene, and the conical second annular screen disc can avoid the phenomenon that the naphthalene is washed outThe residual ammonia water is mixed with the rich solution.

Drawings

FIG. 1 is a schematic sectional view of a desulfurizing tower according to example 1 of the present invention;

FIG. 2 is a schematic top view of the structure of FIG. 1 according to the present invention;

FIG. 3 is a rear view of the structure of FIG. 1 according to the present invention;

FIG. 4 is a schematic view of a system according to embodiment 1 of the present invention;

FIG. 5 is a schematic sectional view showing a desulfurizing tower according to example 2 of the present invention;

FIG. 6 is a schematic top view of the structure of FIG. 2 according to the present invention;

FIG. 7 is a rear view of the structure of FIG. 2 according to the present invention;

FIG. 8 is a schematic view of a system according to embodiment 2 of the present invention;

FIG. 9 shows the process of purifying coke oven gas by using A-S packed desulfurizing tower₂S、CO₂Absorption versus time;

FIG. 10 shows the surface H of a 2% ammonia solution₂S saturated vapor pressure and H₂And (4) a relation graph of S content.

Detailed Description

The present invention is described in further detail with reference to the following examples, but the scope of the present invention is not limited thereto.