CN211570578U

CN211570578U - Deep desulfurization system for coupling of coke oven crude gas and coke

Info

Publication number: CN211570578U
Application number: CN201922049185.6U
Authority: CN
Inventors: 徐兴福; 徐建文; 孙宝东; 李梦岩; 陈旺生; 王世杰; 韩军; 秦林波
Original assignee: Nanjing Iron and Steel Co Ltd
Current assignee: Nanjing Iron and Steel Co Ltd
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-09-25
Anticipated expiration: 2029-11-25

Abstract

The utility model discloses a coke oven crude gasWith coke coupling degree of depth desulfurization system belongs to coking technical field, and this system need not in addition hydrogenation through setting up high temperature coke hydrogenation ware, utilizes the rich H of crude gas self₂The hydrogenation reaction of the coke can be completed, so that the sulfur in the coke is transferred into the coal gas; by arranging a catalytic hydrogenation reactor, the organic sulfur of the raw coke oven gas is nearly completely converted into H by adopting a catalyst₂S, deeply removing organic sulfur and inorganic sulfur in the coke oven gas from the source with high efficiency, thereby greatly reducing the sulfur content of coking benzene products and cokes, improving the quality of the benzene products and cokes, and reducing the load and difficulty of subsequent fine desulfurization.

Description

Deep desulfurization system for coupling of coke oven crude gas and coke

Technical Field

The utility model belongs to the technical field of the coking, concretely relates to coke oven raw gas and coke coupling degree of depth desulfurization system.

Background

With the rapid development of the steel industry in China, the high-quality coking coal resources are in more and more shortage. In the coking coal resources, the sulfur content of coking coal with the sulfur content of more than 1.5 percent exceeds 25 percent, the sulfur content of domestic coking coal is the lowest (less than 1 percent) of the sulfur content 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 metamorphic grade 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 sulfur content in the gas is increased, which causes the sulfur content in the coking benzene products of a plurality of enterprises to exceed the standard, and influences the price and the sale of the benzene products. Meanwhile, the loads of fine desulfurization and environmental protection treatment of the coal gas are increased, and the cost is increased. (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.

Most of inorganic sulfur and a very small part of organic sulfur contained in the coke oven gas can be removed in the wet desulphurization of a coking plant, and most of the organic sulfur can be removed only by adopting a dry method, so that the fine desulphurization process is long, the load is high and the difficulty is high. Four methods for removing organic sulfur by a dry method are an absorption method, a pyrolysis method, a hydrolysis method and a hydro-conversion method, wherein the hydrolysis method and the hydro-conversion method are mainly adopted at home and abroad at present. However, the current 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 coke oven crude gas and coke coupling degree of depth desulfurization system, this system can change over to the coal gas with the sulphur in the coke to organic sulphur and inorganic sulphur in the high-efficient degree of depth desorption coke oven gas of source.

The technical scheme is as follows: the utility model relates to a coke oven crude gas and coke coupling deep desulfurization system, which comprises a high-temperature coke hydrogenation reactor, a primary dust remover, a catalytic hydrogenation reactor, a secondary dust remover, a waste heat boiler, a circulating ammonia water spray tower, a gas-liquid separator, a gas horizontal pipe cooler and a wet desulfurization tower which are arranged in sequence along the crude gas moving path; the high-temperature coke hydrogenation reactor adopts a vertical continuous feeding and discharging reactor, and the catalytic hydrogenation reactor adopts a fixed bed reactor.

The device also comprises a gas storage tank which is arranged in front of the high-temperature coke hydrogenation reactor.

The high-temperature coke hydrogenation reactor comprises a pre-storing section, a desulfurization section and a gas uniform distribution section.

The waste heat boiler comprises a waste heat boiler, a steam pipe network and a steam pipe network, wherein the steam pipe network is connected to the waste heat boiler.

The device also comprises a tar ammonia water clarifying tank, wherein the tar ammonia water clarifying tank is connected to the circulating ammonia water spray tower.

The wet desulphurization tower comprises a wet desulphurization tower body, and is characterized by also comprising a coal gas induced draft fan, wherein the coal gas induced draft fan is connected to the wet desulphurization tower body.

Has the advantages that: the system is provided with the high-temperature coke hydrogenation reactor, additional hydrogenation is not needed, and H rich in raw coke gas is utilized₂The hydrogenation reaction of the coke can be completed, so that the sulfur in the coke is transferred into the coal gas; by arranging a catalytic hydrogenation reactor, the organic sulfur of the raw coke oven gas is nearly completely converted into H by adopting a catalyst₂S, deeply removing organic sulfur and inorganic sulfur in the coke oven gas from the source with high efficiency, thereby greatly reducing the sulfur content of coking benzene products and cokes, improving the quality of the benzene products and cokes, and reducing the load and difficulty of subsequent fine desulfurization. In the process of transferring the coke to the high-temperature coke hydrogenation reactor, the coke granularity is reduced, the granularity distribution is more uniform, and the gas-solid hydrogenation reaction is facilitated; the high-temperature coke hydrogenation reactor can also be used as a filter to filter a small amount of coal dust carried in the raw coke gas, so that the coal dust is further and completely pyrolyzed; meanwhile, the high-temperature coke plays roles of furnace closing and granule finishing in the hydrogenation reactor, and the raw coke gas is rich in CH₄And when the lower hydrocarbon is cracked, a small amount of carbon black is generated to be attached to the pores of the coke, so that the film coating effect is achieved, the reactivity of the coke can be reduced, and the strength of the coke after reaction is improved. In addition, the problem of limited bearing, space and safety of the coke oven can be solved by leading out the raw gas, so that the utilization of the waste heat of the raw gas of the original riser is easier to control, and the heat exchange efficiency is greatly improved.

Drawings

FIG. 1 is a gas flow chart of the deep desulfurization system for coupling raw coke oven gas and coke of the coke oven of the present invention.

Detailed Description

The present invention will be described in further detail with reference to fig. 1 and specific examples.

For a group of 2 x 55-hole JN 60-6 type 6m coke oven top-loading coke ovens, a coking chamber of one coke oven is converged to two gas collecting pipes through an ascending pipe, and then four gas collecting pipes of the two coke ovens are converged to a gas storage tank, so that the gas pressure, the gas quantity and the components are balanced. Then the mixture enters a high-temperature coke hydrogenation reactor which is a vertical continuous feeding and discharging device, and the whole furnace body is divided into a pre-storage section, a desulfurization section and a gas uniform distribution section.

Raw coke gas entering high-temperature coke hydrogenation reactor controls H thereof₂The content is more than 40 percent, and the inlet temperature is controlled to be650-900 ℃. And pushing out the coke after the coke is matured from the carbonization chamber, transferring the coke to a high-temperature coke hydrogenation reactor through a dry quenching coke tank, adding the coke from the upper part of the high-temperature coke hydrogenation reactor, and discharging the coke through a lower rotary discharge valve, wherein the temperature of a coke inlet is controlled to be 950-1050 ℃. The processing capacity of the high-temperature coke hydrogenation reactor is 140t/h, the high-temperature coke and the raw coke gas rich in hydrogen are subjected to hydrogenation reaction, the retention time is about 2h, and most of sulfide sulfur and organic sulfur in the coke can be removed. The desulfurized high-temperature coke is transferred to a dry quenching furnace to recover the high-temperature heat.

And (4) the raw coke gas out of the high-temperature coke hydrogenation reactor enters a primary cyclone dust collector to remove the entrained coke fine powder particles. Then the mixture enters a coal gas catalytic hydrogenation reactor which is a fixed bed type device, and the capacity of treating the coal gas is 6 ten thousand meters³Adopting a Pt-Ni-Mo-Fe-Zn based composite catalyst, controlling the inlet temperature of the raw gas to be 650-1000 ℃, and converting a large amount of organic sulfur in the raw gas into inorganic H through catalytic hydrogenation₂And S. Then the raw gas enters a secondary cyclone dust collector to remove the entrained fine-particle catalyst.

And then, the raw gas enters a waste heat boiler, part of high-temperature heat energy is converted into high-temperature and high-pressure water vapor, the water vapor can be used for production in a gas purification workshop, and the outlet temperature of the raw gas is controlled to be more than 500 ℃ so as to prevent tar from condensing and corroding the heat exchange tube.

And then, the raw gas enters an ammonia water spray tower, the high-temperature raw gas is cooled to about 80 ℃ by adopting the circulating ammonia water spray of a coking plant, the tar ammonia water is condensed, and the cooled raw gas enters a mechanical tar ammonia water clarifying tank. Then, the raw gas enters an HPF (high pressure fluidized bed) desulfurizing tower through a gas-liquid cyclone separator to remove inorganic H in the gas₂And S. And finally, introducing the gas into a gas purification system through a gas induced draft fan to remove ammonia and benzene.

Adopt the utility model discloses behind the technology, sulphur content in the coke can reduce 0.2 ~ 0.5%, and organic sulfur in the raw coke oven gas can get rid of more than 90%, and sulphur content in the coking benzene product can be controlled below 1000mg/kg, and coke quality and benzene product quality obtain effectively promoting. In addition, about 30% of waste heat of the raw gas can be recovered, and the sensible heat recovery of the raw gas brings extra benefits to the subsequent cooling and treatment of the raw gas.

Claims

1. The deep desulfurization system for coupling the raw coke oven gas and the coke is characterized by comprising a high-temperature coke hydrogenation reactor, a primary dust remover, a catalytic hydrogenation reactor, secondary dust removal, a waste heat boiler, a circulating ammonia water spray tower, a gas-liquid separator, a gas transverse pipe cooler and a wet desulfurization tower which are sequentially arranged along the movement path of the raw coke gas; the high-temperature coke hydrogenation reactor adopts a vertical continuous feeding and discharging reactor, and the catalytic hydrogenation reactor adopts a fixed bed reactor.

2. The coke oven raw gas and coke coupling deep desulfurization system of claim 1, further comprising a gas storage tank disposed before the high temperature coke hydrogenation reactor.

3. The coke oven raw gas and coke coupling deep desulfurization system of claim 1, wherein the high temperature coke hydrogenation reactor comprises a prestoring section, a desulfurization section and a gas equipartition section.

4. The coke oven crude gas and coke coupling deep desulfurization system of claim 1, further comprising a steam pipe network, wherein the steam pipe network is connected to the waste heat boiler.

5. The coke oven crude gas and coke coupling deep desulfurization system of claim 1, further comprising a tar ammonia water clarifying tank connected to the circulating ammonia water spray tower.

6. The coke oven crude gas and coke coupling deep desulfurization system of claim 1, further comprising a gas induced draft fan, wherein the gas induced draft fan is connected to the wet desulfurization tower.