CN211771111U - Ascending pipe device for removing organic sulfur in raw coke oven gas - Google Patents
Ascending pipe device for removing organic sulfur in raw coke oven gas Download PDFInfo
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- CN211771111U CN211771111U CN201922264775.0U CN201922264775U CN211771111U CN 211771111 U CN211771111 U CN 211771111U CN 201922264775 U CN201922264775 U CN 201922264775U CN 211771111 U CN211771111 U CN 211771111U
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Abstract
The utility model discloses a desorption coke oven raw gas organic sulfur's tedge device belongs to coking technical field, through setting up gaseous premixing section and hydrodesulfurization section in the tedge, disturb the action to be used in premixing the cavity formation torrent via the whirl of revolving the spray tube, make hydrogen-rich gas and raw gas mix section intensive mixing in gaseous premixing, then through the hydrogenation catalyst bed that the hydrodesulfurization section set up, make organic sulfur hydrogenation form inorganic sulphur, realize the desorption of organic sulphur. The equipment and the method have low production and investment costs, can efficiently and deeply remove organic sulfur in the coke oven gas from the source, greatly reduce the organic sulfur content of the coking benzene product, improve the quality of the benzene product, and reduce the load and difficulty of subsequent fine desulfurization.
Description
Technical Field
The utility model belongs to the technical field of the coking, concretely relates to tedge device of desorption coke oven crude gas organic sulfur.
Background
With the rapid development of the steel industry in China, high-quality coking coal resources are increasingly in short supply. In the coking coal resources, the sulfur content of coking coal with more than 1.5 percent exceeds 25 percent, the sulfur content of domestic coking coal is the lowest of young low-metamorphic gas coal and 1/3 coking coal, and the sulfur content of old gas coal, fat coal and coking coal with higher metamorphism is relatively higher. In order to expand the coking coal resources and reduce the coking cost, more and more coking enterprises have to adopt the coking coal with higher sulfur content, and the consequences are as follows: (1) the increase of the sulfur content in the gas leads to the over-standard sulfur content in the outgoing gas and coking byproducts such as benzene, increases the load of fine desulfurization and environmental protection treatment of the gas, increases the cost, and also influences the price and the sale of the benzene products. (2) The sulfur content in the coke is high, the coke quality is reduced, the iron-making cost is increased, and the environmental protection treatment load is increased.
The coke oven crude gas is a gas product generated in the high-temperature dry distillation process of coal and contains H2S、COS、CS2Most of inorganic sulfur and a very small part of organic sulfur contained in coke oven gas can be removed in coking wet desulphurization, and most of organic sulfur can be removed only by adopting a dry fine desulphurization process.
At present, in the field of novel coal chemical industry, the process flow of fine desulfurization of coke oven gas generally comprises the following steps: pre-addingHydrogen, first-stage hydrogenation, first-stage fine desulfurization, second-stage hydrogenation and second-stage fine desulfurization, wherein the first-stage hydrogenation and the second-stage hydrogenation are used for carrying out hydrogenation reaction on organic sulfur such as mercaptan, thioether and thiophene in raw materials under the action of hydrogenation catalyst to generate inorganic sulfide H2S, is absorbed and removed in a secondary fine desulfurization device. The existing process needs more reaction equipment, has long flow path and occupies larger space due to equipment material quantity. In addition, the existing fine desulfurization method is after the gas purification process, so that most of organic sulfur is still contained in the gas before the benzene washing tower, which is the root cause of over-standard sulfur in the coking benzene product.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: in order to overcome the defects of the prior art, the utility model provides a desorption coke oven raw gas organic sulfur's tedge device, the device can follow the organic sulfur in the high-efficient degree of depth desorption coke oven gas in the source, reduces the organic sulfur content of coking benzene product, improves benzene product quality to alleviate the load and the degree of difficulty of follow-up fine desulphurization.
The technical scheme is as follows: an ascending pipe device for removing organic sulfur in raw coke oven gas comprises a base, a gas premixing section, a hydrodesulfurization section and a bridge pipe which are sequentially communicated from bottom to top; the gas premixing section comprises a premixing chamber and a rotary spraying pipe arranged on the outer wall of the premixing chamber, the rotary spraying pipe comprises a rotary spraying inlet and a gas cyclone channel, the rotary spraying inlet is spiral, the gas cyclone channel extends downwards from the rotary spraying inlet in an inclined mode, and the lower end of the gas cyclone channel is communicated with the premixing chamber; the hydrodesulfurization section comprises a hydrodesulfurization chamber and a hydrogenation reaction catalyst bed layer arranged in the hydrodesulfurization chamber, and a hydrogenation reaction catalyst is arranged in the hydrogenation reaction catalyst bed layer.
Specifically, still be provided with gas distribution board, gas adsorption redistribution bed and gas filtration bed in the hydrodesulfurization chamber, gas distribution board, gas adsorption redistribution bed, hydrogenation catalyst bed and gas filtration bed arrange from bottom to top in proper order.
The gas adsorption redistribution bed layer is formed by filling coke particles, and the particle size of the coke particles is gradually reduced from bottom to top.
The hydrogenation reaction catalyst is a Pt-Ni-Mo-Fe-Zn based composite selective catalyst. Greatly improves the conversion rate of organic sulfur in the coal gas and makes the deep desulfurization of the coal gas more feasible.
The rotary spraying pipe is also provided with an axial inlet, the axial inlet is axially connected to the upper end of the gas cyclone channel, and the rotary spraying inlet is wound on the periphery of the axial inlet.
The two rotary spraying pipes are respectively arranged on two sides of the premixing cavity and are symmetrical relative to a symmetrical plane, and the center line of the gas outlet of the bridge pipe is positioned on the symmetrical plane of the two rotary spraying pipes.
The projections of the two rotary spray pipes on the horizontal plane are consistent with the included angle of the symmetrical plane and are both 60-90 degrees.
The gas premixing section also comprises a temperature measuring device and a hydrogen measuring device. The mixing proportion of the hydrogen-rich gas is adjusted and optimized in time through online temperature measurement and hydrogen measurement.
The bridge pipe is provided with a water seal cover and a coal gas weight, the water seal cover covers the top end of the bridge pipe, and the coal gas weight is arranged inside the bridge pipe; and a pressure adjusting system is also arranged in the bridge pipe, and the opening of the gas weight is adjusted by the pressure adjusting system according to the pressure of the carbonization chamber and the gas flow of the rotary spray pipe. In the coking period, a pressure regulating system of a single chamber of the coking chamber is adopted, so that the pressure change caused by the change of the flow rate of the premixed gas can be adapted.
Has the advantages that: desorption coke oven crude gas organic sulfur's tedge device, through setting up gaseous pre-mixing section and hydrodesulfurization section in the tedge, the whirl through revolving the spray tube disturbs the action and is used in mixing the cavity in advance and form the torrent, makes hydrogen-rich gas and crude gas mix section intensive mixing in advance at gas, then through the hydrogenation catalyst bed that the hydrodesulfurization section set up, makes organic sulfur hydrogenation form inorganic sulphur, realizes the desorption of organic sulphur.
The device utilizes hydrogen-rich gas produced by coking as a hydrogen source, and adjusts the injection amount of the hydrogen-rich gas according to the change of the hydrogen content in the coke oven crude gas along with the time, thereby meeting the hydrogenation requirement of the crude gas in the coking period. And the mixing upper-limit and lower-limit proportion is controlled by online temperature measurement and hydrogen measurement, so that the hydrogen concentration can be ensured, and the phenomenon that the temperature of the mixed raw coke oven gas is lower than 500 ℃ due to the mixing of excessive hydrogen-rich gas is avoided, thereby causing tar condensation. In addition, the low-temperature hydrogen-rich gas is mixed, so that the effect of cooling the raw coke oven gas can be achieved. On one hand, the spraying amount of the subsequent circulating ammonia water is reduced, on the other hand, the temperature can be properly reduced, and the catalyst is ensured to have better reaction conditions.
The hydrogen-rich gas is sprayed in by adopting a rotary spraying structure, so that the hydrogen-rich gas and the raw coke oven gas are fully and uniformly mixed. The rotary spraying structure also enhances the turbulence degree of the gas in the premixing cavity, and is beneficial to the subsequent hydrogenation reaction of the diffusion of the hydrogen and the organic sulfur.
The premixed raw gas mixture sequentially passes through a gas distribution plate, a gas adsorption redistribution bed layer, a hydrogenation reaction catalyst bed layer and a gas filtration bed layer. The gas adsorption redistribution bed layer not only realizes the uniform distribution of gas, but also effectively filters the coal dust and possible a small amount of tar carried in the coal gas. The gas filter bed can effectively filter the entrained catalyst. By adopting the process, the effect of the catalyst is ensured, and the service life of the catalyst is prolonged.
The equipment and the method have low production and investment costs, can efficiently and deeply remove organic sulfur in the coke oven gas from the source, greatly reduce the organic sulfur content of the coking benzene product, improve the quality of the benzene product, and reduce the load and difficulty of subsequent fine desulfurization.
Drawings
FIG. 1 is a schematic view of the overall structure of the riser apparatus of the present invention;
FIG. 2 is a schematic structural view of a base and a gas premixing section of the riser apparatus of the present invention;
FIG. 3 is a schematic view of the hydrodesulfurization section of the riser apparatus of the present invention;
fig. 4 is a schematic top view of the riser pipe assembly of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
For JN 60-6 type 6m top-loading coke ovens, a set of ascending pipe device for removing organic sulfur in raw gas of the coke ovens is arranged at the lateral part of the top of each carbonization chamber, and the raw gas generated in the carbonization chambers at 650-850 ℃ is collected to the gas collecting pipe 5 through the ascending pipe device.
As shown in figure 1, the ascending pipe device for removing organic sulfur in raw coke oven gas comprises a base 1, a gas premixing section 2, a hydrodesulfurization section 3 and a bridge pipe 4 which are sequentially communicated from bottom to top. The base 1 is arranged on the top surface of the carbonization chamber, and the gas premixing section 2 is arranged on the upper part of the base 1.
Referring to fig. 2 and 4, the gas premixing section 2 includes a premixing chamber 21 and two swirl tubes 22 (not shown in fig. 1) mounted on the outer wall of the premixing chamber 21, and a temperature and hydrogen measuring device 24. The swirl tube 22 has a swirl inlet 23, an axial inlet 25, and a gas swirl passage, and the swirl inlet 23 extends downward in a spiral shape and is wound around the outer periphery of the axial inlet 25. The gas swirling flow passage extends obliquely downward from the rear ends of the swirling flow inlet 23 and the axial inlet 25, and the upper end of the gas swirling flow passage communicates with the swirling flow inlet 23 and the axial inlet 25, and the lower end communicates with the premixing chamber 21. The premixing chamber 21 is cylindrical, and the two swirling nozzles 22 are respectively disposed at two sides of the premixing chamber 21 and are symmetrical with respect to a symmetry plane, which is also a symmetry plane of the premixing chamber 21. The gas outlet center line of the bridge pipe 4 is positioned on the symmetrical plane of the two rotary spraying pipes 22. The included angles between the projections of the two rotary nozzles 22 on the horizontal plane and the symmetry plane are both 60 degrees to 90 degrees, in this embodiment, the included angle is 80 degrees, and the two rotary nozzles 22 are both arranged on the other side of the premixing chamber 21 far away from the gas outlet of the bridge pipe 4.
As shown in fig. 3, the hydrodesulfurization section 3 includes a hydrodesulfurization chamber 31, and a gas distribution plate 33, a gas adsorption redistribution bed 34, a hydrogenation catalyst bed 32, and a gas filter bed 35, which are disposed in the hydrodesulfurization chamber 31 and arranged from bottom to top in sequence.
The gas distribution plate 33 is a porous plate-like structure, and holes are densely distributed therein. The gas adsorption redistribution bed layer 34 is formed by filling coke particles, and the particle size of the coke particles is gradually reduced from bottom to top. A hydrogenation reaction catalyst is arranged in the hydrogenation reaction catalyst bed layer 32, and specifically, the hydrogenation reaction catalyst is a Pt-Ni-Mo-Fe-Zn based composite selective catalyst. The gas filtering bed layer 35 is formed by filling ceramic balls.
Referring to fig. 1 again, the bridge pipe 4 is provided with a water seal cover 41 and a gas weight 42, the water seal cover 41 covers the top end of the bridge pipe 4, and the gas weight 42 is installed inside the bridge pipe 4. And a pressure regulating system is also arranged in the bridge pipe 4 and used for regulating the opening degree of the gas weight 42 according to the pressure of the carbonization chamber and the gas flow of the rotary jet pipe 22. On one hand, the device is used for realizing the opening and closing of the bridge pipe 4, on the other hand, the device can realize the online single-chamber pressure regulation, and meets the requirements of the pressure of a carbonization chamber, the pressure control of a riser and smokeless coal charging. The gas outlet of the bridge pipe 4 is connected with a gas collecting pipe 5.
The embodiment also discloses a method for removing organic sulfur in the raw coke oven gas by adopting the ascending pipe device, and particularly relates to the method for removing the organic sulfur in the raw coke oven gas by using the return gas and the H2Respectively, through two inlets of a rotary lance 22 into a premixing chamber 21, wherein the return gas is introduced through a rotary lance inlet 23, H2The gas is introduced through an axial inlet, is initially mixed by a gas swirl passage and enters the premixing chamber 21 at a high velocity. Through the jet disturbance of the airflow, turbulence and better flow field distribution are generated in the premixing chamber 22, so that the hydrogen-rich gas and the raw coke oven gas are fully mixed to form H2The mass percent of the mixed gas is not less than 40 percent, specifically, the mixing amount of the hydrogen-rich gas can be controlled by adopting a gas generation amount mathematical model, the content of the hydrogen in the mixed gas is not less than 40 percent, and the mixing proportion is timely adjusted and optimized by an online temperature measuring and hydrogen measuring device 24, so that the temperature of the mixed gas is not less than 500 ℃. The mixed gas rises and enters a hydrodesulfurization chamber 31, and is uniformly distributed by a gas distribution plate 33, filtered once by a gas adsorption redistribution bed layer 34, hydrogenated by a hydrogenation reaction catalyst bed layer 32 and filtered again by a gas filter bed layer 35, so that the hydrogenation of organic sulfur is converted into inorganic sulfur H2S, finishing the removal of organic sulfur. The hydrogenated mixed raw gas is sprayed with circulating ammonia water to cool the mixed raw gas to about 80 ℃ and then enters a gas collecting pipe.
After the embodiment adopts the utility model discloses a riser device, organic sulfur in the raw coke oven gas can be got rid of more than 90%, and the sulphur content in the coking benzene product can be controlled below 500 mg/kg. The quality of the coking benzene product is improved by one step, and the economic benefit is correspondingly improved. In addition, the raw gas can be primarily cooled, and additional synergy is brought to the subsequent cooling and treatment of the raw gas. And the load and difficulty of subsequent fine desulfurization are reduced, the fine desulfurization process flow is shortened, and the production and investment costs are low.
Claims (9)
1. An ascending pipe device for removing organic sulfur in raw coke oven gas is characterized by comprising a base (1), a gas premixing section (2), a hydrodesulfurization section (3) and a bridge pipe (4) which are sequentially communicated from bottom to top; the gas premixing section (2) comprises a premixing chamber (21) and a cyclone tube (22) arranged on the outer wall of the premixing chamber (21), wherein the cyclone tube (22) comprises a cyclone inlet (23) and a gas cyclone channel, the cyclone inlet (23) is in a spiral shape, the gas cyclone channel extends obliquely downwards from the cyclone inlet (23), and the lower end of the gas cyclone channel is communicated with the premixing chamber (21); the hydrodesulfurization section (3) comprises a hydrodesulfurization chamber (31) and a hydrogenation reaction catalyst bed layer (32) arranged in the hydrodesulfurization chamber (31), and a hydrogenation reaction catalyst is arranged in the hydrogenation reaction catalyst bed layer (32).
2. The ascending pipe device for removing organic sulfur in coke oven crude gas according to claim 1, wherein a gas distribution plate (33), a gas adsorption redistribution bed (34) and a gas filtration bed (35) are further disposed in the hydrodesulfurization chamber (31), and the gas distribution plate (33), the gas adsorption redistribution bed (34), the hydrogenation reaction catalyst bed (32) and the gas filtration bed (35) are sequentially arranged from bottom to top.
3. The ascending pipe device for removing organic sulfur in coke oven crude gas according to claim 2, wherein the gas adsorption redistribution bed layer (34) is formed by filling coke particles, and the particle size of the coke particles is gradually reduced from bottom to top.
4. The ascending pipe device for removing organic sulfur in coke oven crude gas according to claim 1, wherein the hydrogenation catalyst is a Pt-Ni-Mo-Fe-Zn based composite selective catalyst.
5. The ascending pipe device for removing organic sulfur in coke oven crude gas according to claim 1, wherein the cyclone pipe (22) further has an axial inlet (25), the axial inlet (25) is axially connected to the upper end of the gas cyclone channel, and the cyclone inlet (23) is wound around the outer periphery of the axial inlet (25).
6. The uprising pipe device for removing organic sulfur in coke oven crude gas as claimed in claim 5, wherein there are two swirling nozzles (22), two swirling nozzles (22) are respectively disposed at both sides of the premixing chamber (21) and are symmetrical about a symmetry plane, and the gas outlet center line of the bridge pipe (4) is located on the symmetry plane of the two swirling nozzles (22).
7. The ascending pipe device for removing organic sulfur in coke oven crude gas according to claim 6, wherein the projection of the two spiral nozzles (22) on the horizontal plane is consistent with the included angle of the symmetry plane, and the included angles are both 60-90 °.
8. The riser device for removing organic sulfur in coke oven crude gas as claimed in claim 1, wherein said gas premixing section (2) further comprises a temperature measuring and hydrogen measuring device (24).
9. The ascending pipe device for removing organic sulfur in coke oven crude gas according to claim 1, wherein the bridge pipe (4) is provided with a water seal cover (41) and a gas lead (42), the water seal cover (41) covers the top end of the bridge pipe (4), and the gas lead (42) is installed inside the bridge pipe (4); and a pressure adjusting system is also arranged in the bridge pipe (4), and the pressure adjusting system adjusts the opening degree of the gas weight (42) according to the pressure of the carbonization chamber and the gas flow of the rotary spray pipe (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922264775.0U CN211771111U (en) | 2019-12-16 | 2019-12-16 | Ascending pipe device for removing organic sulfur in raw coke oven gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922264775.0U CN211771111U (en) | 2019-12-16 | 2019-12-16 | Ascending pipe device for removing organic sulfur in raw coke oven gas |
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| CN211771111U true CN211771111U (en) | 2020-10-27 |
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| CN201922264775.0U Active CN211771111U (en) | 2019-12-16 | 2019-12-16 | Ascending pipe device for removing organic sulfur in raw coke oven gas |
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