阅读说明：本技术 一种精脱硫预加氢催化剂在线增加冷激管线的工艺 (Process for online adding cold shock pipeline for fine desulfurization pre-hydrogenation catalyst ) 是由 王乃国 李栋柱 刘金波 郭德杰 王广阔 于 2019-10-13 设计创作，主要内容包括：本发明公开了一种精脱硫预加氢催化剂在线增加冷激管线的工艺,包括依次设置的加热炉、加氢预转化器、一级加氢转化器、一级氧化锌脱硫器、二级加氢转化器和二级氧化锌脱硫器,以及用于运输冷激煤气的冷激总管,所述冷激总管上设置有多个支管,该支管的另一端分别引入到加氢预转化器、一级加氢转化器、二级加氢转化器的槽子入口处,用于控制床层的温度。本发明通过在加氢转化器的槽子入口处增加一条煤气冷激总管,在更换的新催化剂硫化或倒新槽子时,催化剂床层容易超温,当床层温度上升过快时,通过加入的冷激煤气对催化剂床层进行降温,避免了停车硫化的问题,实现在线硫化,不影响LNG的生产量,减小了生产损失。(The invention discloses a process for increasing a cold shock pipeline of a fine desulfurization pre-hydrogenation catalyst on line, which comprises a heating furnace, a hydrogenation pre-converter, a first-stage hydrogenation converter, a first-stage zinc oxide desulfurizer, a second-stage hydrogenation converter, a second-stage zinc oxide desulfurizer and a cold shock header pipe for transporting cold shock coal gas, wherein the heating furnace, the hydrogenation pre-converter, the first-stage hydrogenation converter, the first-stage zinc oxide desulfurizer, the second-stage zinc oxide desulfurizer and the cold shock header pipe are sequentially arranged, a plurality of branch pipes are arranged on the cold shock header pipe, and the other ends of the branch pipes are respectively introduced into groove inlets of the hydrogenation pre-converter, the first-. According to the invention, the gas quenching main pipe is additionally arranged at the entrance of the groove of the hydrogenation converter, so that the catalyst bed layer is easily over-heated when a new catalyst is replaced for vulcanization or the groove is replaced, and when the temperature of the bed layer rises too fast, the temperature of the catalyst bed layer is reduced by the added quenching gas, so that the problem of stop vulcanization is avoided, the on-line vulcanization is realized, the production of LNG is not influenced, and the production loss is reduced.)

1. A process for increasing a cold shock pipeline of a fine desulfurization pre-hydrogenation catalyst on line is characterized by comprising a heating furnace (2) for preheating coke oven gas, a hydrogenation pre-converter (3) for removing substances harmful to the catalyst, a first-stage hydrogenation converter (5), a first-stage zinc oxide desulfurizer (6), a second-stage hydrogenation converter (7), a second-stage zinc oxide desulfurizer (8) and a cold shock header pipe (11) for transporting the cold shock gas, wherein the heating furnace (2) is provided with an air inlet (1) for introducing the coke oven gas, the second-stage zinc oxide desulfurizer (8) is provided with an air outlet (9) for discharging LNG, the cold shock header pipe (11) is provided with a plurality of branch pipes (10), and the other ends of the branch pipes (10) are respectively introduced into groove inlets of the hydrogenation pre-converter (3), the first-stage hydrogenation converter (5) and the second-stage hydrogenation converter (7), the device is used for controlling the temperature of a bed layer and preventing the bed layer from overtemperature when the pre-hydrogenation catalyst is vulcanized on line or a groove is replaced, and the hydrogenation pre-converter (3), the primary hydrogenation converter (5) and the secondary hydrogenation converter (7) are respectively provided with a blow-down pipe (14).

2. The process for adding the cold shock pipeline to the fine desulfurization prehydrogenation catalyst in the online manner according to claim 1, wherein a heat exchanger (4) is arranged on a conducting pipe between the hydrogenation pre-converter (3) and the primary hydrogenation converter (5).

3. The process for adding a cold shock pipeline to a fine desulfurization prehydrogenation catalyst in line according to claim 2, wherein the iron-molybdenum catalyst is filled in the hydrogenation pre-converter (3) and the first-stage hydrogenation converter (5).

4. The process for adding a cold shock pipeline to a fine desulfurization prehydrogenation catalyst in-line according to claim 3, wherein the secondary hydroconversion unit (7) is loaded with a nickel-molybdenum catalyst.

5. The process for increasing the cold shock pipeline of the fine desulfurization prehydrogenation catalyst in the claim 4, characterized in that the branch pipe (10) is provided with a cold shock valve.

6. The process for adding the cold shock pipeline to the fine desulfurization prehydrogenation catalyst in the claim 5 is characterized in that the cold shock header pipe (11) is provided with a header valve (12).

7. The process for adding the cold shock pipeline to the fine desulfurization prehydrogenation catalyst in the claim 6, characterized in that the blow-down pipe (14) is provided with a blow-down valve (13).

Technical Field

The invention relates to a chemical technology, in particular to a process for adding a cold shock pipeline to a fine desulfurization prehydrogenation catalyst on line.

Background

Coke oven gas, also called coke oven gas, is a combustible gas produced while producing coke and tar products, and is a byproduct of the coking industry, and if the coke oven gas is directly discharged into the atmosphere, the coke oven gas wastes energy and causes great pollution to the environment. Because the components of the coke oven gas are complex, the sulfide content is very high, and the normal production operation of production is influenced, the coke oven gas needs to be subjected to fine desulfurization treatment before being utilized.

In the process of coke oven gas treatment, hydrogenation catalyst treatment and desulfurization treatment need to be carried out on the coke oven gas, and practice proves that when a primary pre-hydrogenation catalyst is combined with a tank, due to the fact that the standing time of a new catalyst after vulcanization is finished is too long, when the coke oven gas is introduced again, the temperature of a bed layer is easy to generate an overtemperature phenomenon, although the new tank can be slowly incorporated into a system when the gas is introduced at low temperature and low flow, the required time is too long, the emptying amount is large, and the influence on the yield of LNG is large. Meanwhile, when the new catalyst replaced in the existing design is vulcanized, the shutdown vulcanization is necessary, and the production is also influenced.

Disclosure of Invention

The invention aims to provide a process for adding a quenching pipeline on line for a fine desulfurization pre-hydrogenation catalyst, which solves the problems, and the process is characterized in that a coal gas quenching main pipe is added at the inlet of a groove of a converter to prevent the bed layer from being over-heated when the pre-hydrogenation catalyst is vulcanized on line or the groove is replaced, so that the function of vulcanizing on line is realized, and the production loss is reduced.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a process for online adding a quench pipeline to a fine desulfurization and pre-hydrogenation catalyst comprises a heating furnace for preheating coke oven gas, a hydrogenation pre-converter for removing substances harmful to the catalyst, a first-stage hydrogenation converter, a first-stage zinc oxide desulfurizer, a second-stage hydrogenation converter, a second-stage zinc oxide desulfurizer and a quench main pipe for transporting the quench gas, wherein the heating furnace is provided with an air inlet for introducing the coke oven gas, the second-stage zinc oxide desulfurizer is provided with an air outlet for discharging LNG, the quench main pipe is provided with a plurality of branch pipes, the other ends of the branch pipes are respectively introduced into groove inlets of the hydrogenation pre-converter, the first-stage hydrogenation converter and the second-stage hydrogenation converter and used for controlling the temperature of a bed layer and preventing the bed layer from being over-heated when the pre-hydrogenation catalyst is vulcanized on line or a groove is replaced, and the hydrogenation pre-converter, the first-stage hydrogenation converter, the second-stage hydrogenation, And the second-stage hydrogenation converter is respectively provided with a vent pipe.

The cold quenching gas in the cold quenching main pipe of the invention comes from a low-temperature process before the heating furnace.

Further, a heat exchanger is arranged on a conducting pipe between the hydrogenation pre-converter and the first-stage hydrogenation converter.

Furthermore, the hydrogenation pre-converter and the first-stage hydrogenation converter are filled with iron-molybdenum catalysts.

Further, the secondary hydrogenation converter is filled with a nickel-molybdenum catalyst.

Furthermore, a cold shock valve is arranged on the branch pipe.

Furthermore, a main valve is arranged on the cold shock main pipe.

Furthermore, a vent valve is arranged on the vent pipe.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, the gas quenching main pipe is additionally arranged at the entrance of the groove of the hydrogenation converter, so that the catalyst bed layer is easily over-heated when a new catalyst is replaced for vulcanization or the groove is replaced, and when the temperature of the bed layer rises too fast, the temperature of the catalyst bed layer is reduced by the added quenching gas, so that the problem of stop vulcanization is avoided, the on-line vulcanization is realized, the production of LNG is not influenced, and the production loss is reduced.

Drawings

FIG. 1 is a schematic flow diagram of a coke oven gas desulfurization process of the present invention.

FIG. 2 is a schematic flow diagram of the process for adding a quench line of the present invention.

Wherein, the names corresponding to the reference numbers are:

1-gas inlet, 2-heating furnace, 3-hydrogenation pre-converter, 4-heat exchanger, 5-first-stage hydrogenation converter, 6-first-stage zinc oxide desulfurizer, 7-second-stage hydrogenation converter, 8-second-stage zinc oxide desulfurizer, 9-gas outlet, 10-branch pipe, 11-cold shock header pipe, 12-main valve, 13-blow-off valve and 14-blow-off pipe.

Detailed Description

The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.