阅读说明：本技术 一种脱硫催化剂再生方法及系统 (Desulfurization catalyst regeneration method and system ) 是由 谢建 刘国华 肖嘉玉 于 2021-08-23 设计创作，主要内容包括：本发明属于脱硫催化剂再生技术领域,涉及一种脱硫催化剂再生方法及系统,系统包括通过管道串接形成回路的再生塔、列管式换热器、缓冲喷淋塔、加压风机、冷却罐、过热器。再生补气与再生尾气混合后进入列管式换热器,升温后进入过热器进一步提升温度,之后通入再生塔对脱硫催化剂实现高温热再生。高温再生尾气进入列管式换热器实现尾气余热利用,同时液态单质硫在此被捕集,之后再生尾气依次经由缓冲喷淋塔、加压风机、气体总硫检测仪、冷却罐后再次进入列管式换热器进行循环利用。本发明具有能耗低、系统热效率高、催化剂破损小、无复杂的尾气处理系统、硫便于回收利用等特点。(The invention belongs to the technical field of desulfurization catalyst regeneration, and relates to a desulfurization catalyst regeneration method and a system. And mixing the regenerated gas supply and the regenerated tail gas, then feeding the mixture into a tubular heat exchanger, heating the mixture, then feeding the mixture into a superheater for further increasing the temperature, and then feeding the mixture into a regeneration tower for realizing high-temperature thermal regeneration of the desulfurization catalyst. The high-temperature regenerated tail gas enters the tubular heat exchanger to realize tail gas waste heat utilization, meanwhile, liquid elemental sulfur is trapped at the tubular heat exchanger, and then the regenerated tail gas sequentially passes through the buffer spray tower, the booster fan, the gas total sulfur detector and the cooling tank and then enters the tubular heat exchanger again for cyclic utilization. The invention has the characteristics of low energy consumption, high system thermal efficiency, small catalyst damage, no complex tail gas treatment system, convenient sulfur recycling and the like.)

1. A desulfurization catalyst regeneration system characterized by: comprises a regeneration tower, a tubular heat exchanger, a cooling tank, a superheater, a buffer spray tower and a pressurizing fan; the regeneration tower, the shell pass of the tube type heat exchanger, the buffer spray tower, the booster fan, the cooling tank, the tube pass of the tube type heat exchanger and the superheater are sequentially connected in series through pipelines to form a loop;

the tube pass inlet of the tube type heat exchanger is also connected with a regeneration air supply pipeline; a funnel-shaped liquid elemental sulfur outlet is also formed in the shell of the shell-and-tube heat exchanger; the buffer spray tower is also provided with a nozzle and a residual liquid discharge port;

the regeneration tower is provided with a charging opening for inputting the desulfurization catalyst to be regenerated and a discharging opening for discharging the regenerated desulfurization catalyst; the discharge opening is communicated with the cooling tank; and a regenerated desulfurization catalyst outlet is formed in the cooling tank.

2. The desulfurization catalyst regeneration system according to claim 1, characterized in that: and a gas total sulfur detector is arranged on a connecting pipeline between the buffer spray tower and the pressurizing fan.

3. A method for regenerating a desulfurization catalyst, comprising: the desulfurization catalyst regeneration system of any one of claims 1-2 is adopted, a desulfurization catalyst to be regenerated is input into a regeneration tower, regeneration gas is input into a regeneration gas supplementing pipeline, the regeneration gas supplementing is mixed with regeneration tail gas generated by a cooling tank to form low-temperature regeneration gas, the low-temperature regeneration gas is heated by a tubular heat exchanger and a superheater in sequence to form high-temperature regeneration gas, the high-temperature regeneration gas is input into the regeneration tower for thermal regeneration treatment, and elemental sulfur adsorbed in pores of the desulfurization catalyst is dissolved and evaporated at high temperature to form high-temperature regeneration tail gas;

carrying out heat exchange on the high-temperature regeneration tail gas and the low-temperature regeneration gas through a tubular heat exchanger, cooling and condensing gaseous elemental sulfur in the high-temperature regeneration tail gas in the tubular heat exchanger to form liquid elemental sulfur, and discharging the liquid elemental sulfur through a liquid elemental sulfur outlet;

sending the high-temperature regeneration tail gas cooled by the tube type heat exchanger into a buffer spray tower, settling dust or incompletely evaporated liquid in the regeneration tail gas in the buffer spray tower, and discharging the dust or incompletely evaporated liquid through a residual liquid discharge port;

conveying the high-temperature regenerated desulfurization catalyst generated by the regeneration tower to a cooling tank, pressurizing the regenerated tail gas from the buffer spray tower by a pressurizing fan, inputting the pressurized tail gas into the cooling tank, cooling the regenerated desulfurization catalyst, simultaneously increasing the temperature of the regenerated tail gas, and outputting the cooled regenerated desulfurization catalyst from an outlet of the regenerated desulfurization catalyst;

and mixing the regenerated tail gas heated by the cooling tank with the regenerated gas to form low-temperature regenerated gas, and then, allowing the low-temperature regenerated gas to enter the tubular heat exchanger for cyclic utilization.

4. The desulfurization catalyst regeneration method according to claim 3, characterized in that: and when the temperature of the gas entering the buffer spray tower exceeds a set value or the total sulfur content of the regeneration tail gas monitored by a gas total sulfur analyzer exceeds a set value, starting the nozzle to cool and absorb the regeneration tail gas.

5. The desulfurization catalyst regeneration method according to claim 4, characterized in that: the spray liquid used by the nozzle is water or alkaline solution.

6. The desulfurization catalyst regeneration method according to claim 3, characterized in that: the desulfurization catalyst is one or a mixture of more of active carbon, ferric oxide, molecular sieve and zinc oxide.

7. The desulfurization catalyst regeneration method according to claim 3, characterized in that: the regeneration air supplement is one or more mixed gas of saturated steam, superheated steam, nitrogen, water and air, and the temperature is not lower than 100 ℃.

8. The desulfurization catalyst regeneration method according to claim 3, characterized in that: the temperature of the high-temperature regeneration gas input into the regeneration tower is controlled to be 500-600 ℃.

9. The desulfurization catalyst regeneration method according to claim 3, characterized in that: the superheater is heated by fuel combustion or electric heating.

Technical Field

The invention belongs to the technical field of desulfurization catalyst regeneration, and particularly relates to a method and a system for regenerating a saturated desulfurization catalyst, which are particularly suitable for occasions related to blast furnace gas desulfurization, coke oven gas desulfurization, natural gas desulfurization and the like.

Background

Common fuel gas such as blast furnace gas, natural gas, coke oven gas and the like contains a large amount of sulfide, which not only causes corrosion of equipment and pipelines, but also is mostly converted into SO in the combustion process of the fuel gas₂The emission to the atmosphere brings environmental pollution. Desulfurization of fuel gas can not only solve the above problems but also convert harmful sulfides into useful sulfur, sulfuric acid, and other chemicals having high added values. The currently common desulfurization method is dry desulfurization combined with thermal regeneration.

The dry desulfurization process has the advantages of no wastewater discharge, high working sulfur capacity, high desulfurization precision and the like, and is widely applied to the desulfurization of fuel gas. The desulfurization catalyst is used as the core of the dry desulfurization process and must maintain certain desulfurization activity. Common desulfurization catalysts, such as activated carbon, can convert hydrogen sulfide into elemental sulfur to be stored in pores during the process of removing hydrogen sulfide, and the hydrogen sulfide must be regenerated after saturated adsorption.

The thermal regeneration method has the advantages of high regeneration efficiency, short regeneration time, no waste liquid generation and the like, and is widely applied to the field of desulfurization catalyst regeneration. However, the conventional thermal regeneration process also has the disadvantages of large catalyst mass loss, more damage, high energy consumption and the like, and particularly has low utilization rate of the waste heat of the regenerated tail gas and needs a complex tail gas purification system.

Disclosure of Invention

In view of the above, the present invention provides a method and a system for regenerating a desulfurization catalyst, which solves the above technical problems.

In order to achieve the purpose, the invention provides the following technical scheme:

a desulfurization catalyst regeneration system comprises a regeneration tower, a tubular heat exchanger, a cooling tank, a superheater, a pressurizing fan and a buffer spray tower; the regeneration tower, the shell pass of the tube type heat exchanger, the buffer spray tower, the booster fan, the cooling tank, the tube pass of the tube type heat exchanger and the superheater are sequentially connected in series through pipelines to form a loop;

the tube pass inlet of the tube type heat exchanger is also connected with a regeneration air supply pipeline; a funnel-shaped liquid elemental sulfur outlet is also formed in the shell of the shell-and-tube heat exchanger; the buffer spray tower is also provided with a nozzle and a residual liquid discharge port;

the regeneration tower is provided with a charging opening for inputting the desulfurization catalyst to be regenerated and a discharging opening for discharging the regenerated desulfurization catalyst; the discharge opening is communicated with the cooling tank; and a regenerated desulfurization catalyst outlet is formed in the cooling tank.

Further, a gas total sulfur detector is arranged on a connecting pipeline between the buffer spray tower and the pressurizing fan.

A desulfurization catalyst regeneration method adopts the desulfurization catalyst regeneration system, a desulfurization catalyst to be regenerated is input into a regeneration tower, regeneration gas is input into a regeneration gas supply pipeline, the regeneration gas supply is mixed with regeneration tail gas generated by a cooling tank to form low-temperature regeneration gas, the low-temperature regeneration gas is heated by a tubular heat exchanger and a superheater in sequence to form high-temperature regeneration gas, the high-temperature regeneration gas is input into the regeneration tower for thermal regeneration treatment, and elemental sulfur adsorbed in pores of the desulfurization catalyst is dissolved and evaporated at high temperature to form high-temperature regeneration tail gas;

carrying out heat exchange on the high-temperature regeneration tail gas and the low-temperature regeneration gas through a tubular heat exchanger, cooling and condensing gaseous elemental sulfur in the high-temperature regeneration tail gas in the tubular heat exchanger to form liquid elemental sulfur, and discharging the liquid elemental sulfur through a liquid elemental sulfur outlet;

sending the high-temperature regeneration tail gas cooled by the tube type heat exchanger into a buffer spray tower, settling dust or incompletely evaporated liquid in the regeneration tail gas in the buffer spray tower, and discharging the dust or incompletely evaporated liquid through a residual liquid discharge port;

conveying the high-temperature regenerated desulfurization catalyst generated by the regeneration tower to a cooling tank, pressurizing the regenerated tail gas from the buffer spray tower by a pressurizing fan, inputting the pressurized tail gas into the cooling tank, cooling the regenerated desulfurization catalyst, simultaneously increasing the temperature of the regenerated tail gas, and outputting the cooled regenerated desulfurization catalyst from a regenerated desulfurization catalyst outlet;

and mixing the regenerated tail gas heated by the cooling tank with the regenerated gas to form low-temperature regenerated gas, and then, allowing the low-temperature regenerated gas to enter the tubular heat exchanger for cyclic utilization.

Further, when the temperature of the gas entering the buffer spray tower exceeds a set value or the total sulfur content of the regeneration tail gas monitored by a gas total sulfur analyzer exceeds a set value, the nozzle is started to cool and absorb sulfur in the regeneration tail gas.

Further, the spray liquid used by the nozzle is water or alkaline solution; such as NaOH solution, Na₂CO₃Solutions, alkaline organic solutions, and the like.

Further, the desulfurization catalyst is one or a mixture of more of activated carbon, iron oxide, molecular sieve and zinc oxide.

Further, the regeneration air supplement is one or more mixed gas of saturated steam, superheated steam, nitrogen, water and air, and the temperature is not lower than 100 ℃.

Further, the temperature of the high-temperature regeneration gas input into the regeneration tower is controlled to be 500-600 ℃.

Further, the superheater is heated by fuel combustion or electric heating.

The invention has the beneficial effects that:

1) the invention fully utilizes the waste heat of the regenerated tail gas, and has high system heat efficiency and low energy consumption.

2) The regeneration tower can adopt a fixed bed or moving bed process, no moving equipment is arranged in the tower, and the damage of the desulfurization catalyst is small.

3) The invention realizes the recycling of the regenerated tail gas without a complex tail gas purification treatment system.

4) The product formed after regeneration in the invention not only regenerates the desulfurization catalyst, but also has liquid or solid elemental sulfur, and has considerable economic value.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of a desulfurization catalyst regeneration system in accordance with the present invention;

FIG. 2 is a schematic structural view of a shell and tube heat exchanger according to the present invention.

Reference numerals: 1-a regeneration column; 2-cooling the tank; 3-a shell and tube heat exchanger; 4-a superheater; 5-a booster fan; 6-buffer spray tower; 7-a nozzle; 8-gas total sulfur detector; a-a desulfurization catalyst to be regenerated; b-a regenerated desulfurization catalyst; c-regeneration and air supplement; d-liquid elemental sulfur; e-spraying liquid; f-residual liquid.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

Referring to fig. 1-2, a desulfurization catalyst regeneration system includes a regeneration tower 1, a tubular heat exchanger 3, a cooling tank 2, a superheater 4, a booster fan 5, and a buffer spray tower 6; wherein the regeneration tower 1, the shell pass of the tubular heat exchanger 3, the buffer spray tower 6, the booster fan 5, the cooling tank 2, the tube pass of the tubular heat exchanger 3 and the superheater 4 are connected in series through pipelines to form a loop;

wherein, the tube side inlet of the shell and tube heat exchanger 3 is also provided with a regeneration air supply pipeline; the bottom of the shell of the tubular heat exchanger 3 is provided with a funnel-shaped liquid elemental sulfur outlet; the buffer spray tower 6 is also provided with a nozzle 7, and the bottom of the buffer spray tower 6 is provided with a residual liquid discharge port;

the regeneration tower 1 is provided with a charging opening for inputting the desulfurization catalyst A to be regenerated and a discharging opening for discharging the regenerated desulfurization catalyst B; the discharge opening is communicated with the cooling tank 2; a regenerated desulfurization catalyst outlet is arranged on the cooling tank 2, and a gas total sulfur detector 8 is arranged on a connecting pipeline between the buffer spray tower 6 and the booster fan 5.

By adopting the desulfurization catalyst regeneration method of the desulfurization catalyst regeneration system in the embodiment, the desulfurization catalyst A to be regenerated is input into the regeneration tower 1, the regeneration gas supplement C is input into the regeneration gas supplement pipeline, the regeneration gas supplement C is mixed with the regeneration tail gas generated by the cooling tank 2 to form low-temperature regeneration gas, the low-temperature regeneration gas is heated by the superheater 4 to form high-temperature regeneration gas at 500-600 ℃, the high-temperature regeneration gas is input into the regeneration tower 1 for thermal regeneration treatment, and the elemental sulfur adsorbed in the pores of the desulfurization catalyst is dissolved and evaporated at high temperature to form high-temperature regeneration tail gas at 450-550 ℃;

carrying out heat exchange on the high-temperature regeneration tail gas and the low-temperature regeneration gas through a tubular heat exchanger 3, heating the low-temperature regeneration gas to 300-400 ℃, cooling the high-temperature regeneration tail gas to 150-250 ℃, cooling and condensing gaseous elemental sulfur in the high-temperature regeneration tail gas in the shell pass of the tubular heat exchanger 3 to form liquid elemental sulfur D, and discharging the liquid elemental sulfur D through a liquid elemental sulfur outlet;

sending the high-temperature regeneration tail gas cooled by the tubular heat exchanger 3 into a buffer spray tower 6, settling dust or incompletely evaporated liquid in the regeneration tail gas in the buffer spray tower 6 to form a raffinate F, and discharging the raffinate F through a raffinate discharge port;

conveying the high-temperature regenerated desulfurization catalyst generated by the regeneration tower 1 to a cooling tank 2, pressurizing the regenerated tail gas from a buffer spray tower 6 by a pressurizing fan 5, inputting the pressurized tail gas into the cooling tank 2, cooling the regenerated desulfurization catalyst B, simultaneously increasing the temperature of the regenerated tail gas, and outputting the cooled regenerated desulfurization catalyst B from a regenerated desulfurization catalyst outlet;

and mixing the regenerated tail gas heated by the cooling tank 2 with the regenerated gas supply C to form low-temperature regenerated gas, and then, feeding the low-temperature regenerated gas into the tube pass of the tube type heat exchanger 3 for cyclic utilization.

When the temperature of the gas entering the buffer spray tower 6 exceeds a set value or the total sulfur content of the regeneration tail gas monitored by the gas total sulfur detector 8 exceeds a set value, the nozzle 7 is started to cool and absorb the regeneration tail gas.

In this embodiment, the spray liquid E used for the nozzles 7 is water or an alkaline solution.

In this embodiment, the desulfurization catalyst is one or a mixture of more of activated carbon, iron oxide, molecular sieve, and zinc oxide.

In this embodiment, the regeneration make-up gas C is one or more of saturated steam, superheated steam, nitrogen, water, and air, and the temperature is not lower than 100 ℃.

In the present embodiment, the superheater 4 can be heated by fuel combustion or electrically heated.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.