CN214810712U

CN214810712U - Catalyst activation device of fluidized bed reactor

Info

Publication number: CN214810712U
Application number: CN202022841943.0U
Authority: CN
Inventors: 李恩平; 施以军; 颜作标; 胡孝春
Original assignee: Anhui Jinhe Industrial Co Ltd
Current assignee: Anhui Jinhe Industrial Co Ltd
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2021-11-23
Anticipated expiration: 2030-12-02

Abstract

The utility model relates to a fluidized bed reactor catalyst activation device sets up a steam input pipe (3) respectively in the both sides of every feed nozzle (2) of original fluidized bed bottom, and the steam input pipe lets in steam and activates fluidized bed knot wall to eliminate knot wall and accessory substance, reduce adsorbate content in the catalysis simultaneously. The utility model has the advantages that: 1. the wall-bonding phenomenon of the fluidized bed reactor is effectively eliminated, the system operation period is prolonged, the overhaul times are reduced, and the overhaul cost is reduced; 2. the wall deposition is reduced, the fluidized bed effect in the reactor is ensured, the long-term use of the catalyst is ensured, the effective production time of the system is prolonged, the yield is ensured, and the unit consumption of bituminous coal, electricity, the catalyst and the like is reduced. After comparing with original use, the utility model discloses a catalyst consumption descends 25%, life cycle extension 100%, and the bituminous coal consumption descends 2~3% after the operation, and electricity consumption descends about 5%.

Description

Catalyst activation device of fluidized bed reactor

Technical Field

The utility model belongs to the technical field of chemical production, in particular to fluidized bed reactor catalyst activation device.

Background

The melamine production is a normal and low pressure method production process taking urea as a raw material, the raw material for producing the melamine is the urea, local caking can be formed at the lower part of a fluidized bed after long-time operation due to uneven distribution of air flow and incomplete reaction in the fluidized bed, the air flow distribution and the reaction effect are further influenced, the activity of a catalyst is gradually reduced, and the yield is also gradually reduced along with the operation time. Therefore, after the operation for a period of time, overhaul is needed, the catalyst is unloaded and cleaned to the fluidized bed, the overhaul time is long, the labor intensity is high, and more waste is generated.

By monitoring the activity and the temperature point of the catalyst in the bed, the catalyst is activated regularly in production, the activity of the catalyst is maintained, the wall forming rate in the bed is reduced, the operation period of a system can be effectively prolonged, the yield is improved, the consumption is reduced, and the generation of wastes is also reduced.

The utility model has the following contents:

the utility model aims at providing a fluidized bed reactor catalyst activation device for solving the defect that catalyst efficiency is reduced because the catalyst is easy to be adhered to the wall in the fluidized bed existing in the prior art.

The utility model aims at realizing through the following technical scheme:

a fluidized bed reactor catalyst activation device characterized by:

two sides of each feeding nozzle at the bottom of the original fluidized bed are respectively provided with a steam input pipe (3), and each steam input pipe is inserted into the fluidized bed by 10-20 cm.

Furthermore, the included angle between the central line of each steam input pipe (3) and the central line of the feed charging nozzle (2) is 15 degrees.

The utility model discloses in the use, the temperature that lets in steam is 150~300 ℃, utilizes high-temperature steam to give the system circulation activation that heaies up. The activation process adopts three stages, wherein the first stage is 290-300 ℃ for 1-1.5 h, the second stage is 150-180 ℃ for 0.5-1.0 h, and the third stage is 290-300 ℃ for 2-3 h.

According to the parameters of temperature at the feeding nozzle, temperature at each point of the fluidized bed, catalyst specific gravity and fluidized bed reactor resistance, the catalyst is activated irregularly, the wall formation and byproducts are eliminated by utilizing the principle that high-temperature steam reacts with the byproducts of urea and triamine, the content of adsorbate of the catalyst is reduced, and ammonia and carbon dioxide generated by the reaction are absorbed by ammonia water.

The utility model has the advantages that: 1. the wall-bonding phenomenon of the fluidized bed reactor is effectively eliminated, the system operation period is prolonged, the overhaul times are reduced, and the overhaul cost is reduced; 2. the wall deposition is reduced, the fluidized bed effect in the reactor is ensured, the long-term use of the catalyst is ensured, the effective production time of the system is prolonged, the yield is ensured, and the unit consumption of bituminous coal, electricity, the catalyst and the like is reduced. After comparing with original use, the utility model discloses a catalyst consumption descends 25%, life cycle extension 100%, and the bituminous coal consumption descends 2~3% after the operation, and electricity consumption descends about 5%.

Description of the drawings:

FIG. 1 is a schematic diagram of a fluidized bed reactor according to the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1.

The specific implementation mode is as follows:

example one:

as shown in figure 1 and figure 2, the utility model discloses a fluidized bed reactor, including the fluidized bed body 1, the equipartition sets up a set of 4 feed nozzle 2 on its circumference, and every feed nozzle's both sides set up a steam input pipe 3 respectively, and the contained angle between steam input pipe's central line and the feed nozzle central line is 15 degrees, and every steam input pipe inserts 10~20cm in the fluidized bed. And the temperature of the introduced steam is 150-300 ℃, and the high-temperature steam is utilized to heat the system for cyclic activation. The activation process adopts three stages, wherein the first stage is 290-300 ℃ for 1-1.5 h, the second stage is 150-180 ℃ for 0.5-1.0 h, and the third stage is 290-300 ℃ for 2-3 h.

As can be seen from FIG. 1, the upper part of the fluidized bed is a catalyst sulfidation state zone 4, and a bonding wall 5 is bonded to the inner wall of the upper fluidized bed body, and the thickness is about 50 cm-100 cm.

A fluidized bed reactor catalyst activation device, its process step as follows: heating the system by high-temperature steam at the temperature of 150-300 ℃ for cyclic activation; the activation process adopts three stages of high temperature, low temperature and high temperature, specifically, the first stage is 290-300 ℃ and lasts for 1-1.5 h, the second stage is 150-180 ℃ and lasts for 0.5-1.0 h, and the third stage is 290-300 ℃ and lasts for 2-3 h.

Heating up the system by high-temperature steam at the temperature of 150-300 ℃ for cyclic activation, wherein the high-temperature steam is mainly used for removing the wall junction and dissolving the wall junction by using high-temperature positive pressure; the activation process adopts three stages of high temperature, low temperature and high temperature, specifically, the first stage is 290 ℃ and lasts for 1 hour, the second stage is 150 ℃ and lasts for 0.5 hour, and the third stage is 290 ℃ and lasts for 2 hours, so that the wall-sticking phenomenon of the reactor is eliminated, and the content of adsorbed substances in the catalyst is reduced to 91%.

Example two:

heating the system by high-temperature steam at the temperature of 150-300 ℃ for cyclic activation; the activation process adopts three stages of high temperature, low temperature and high temperature, specifically, the first stage is 295 ℃ and lasts for 1.25h, the second stage is 165 ℃ and lasts for 0.75h, and the third stage is 295 ℃ and lasts for 2.5h, so that the wall-sticking phenomenon of the reactor is eliminated, and the content rate of adsorbed substances in the catalyst is reduced by 93%.

Example three:

heating the system by high-temperature steam at the temperature of 150-300 ℃ for cyclic activation; the activation process adopts three stages of high temperature, low temperature and high temperature, specifically, the first stage is 300 ℃ and lasts for 1.5h, the second stage is 180 ℃ and lasts for 1h, the third stage is 300 ℃ and lasts for 3h, the wall-bonding phenomenon of the reactor is eliminated, and the content of adsorbed substances in the catalyst is reduced by 95%.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; the invention is not limited to the embodiments described herein, but is capable of other embodiments according to the invention, and may be used in various other applications, including, but not limited to, industrial, or industrial. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments by the technical entity of the present invention all still belong to the protection scope of the technical solution of the present invention.

Claims

1. A fluidized bed reactor catalyst activation device characterized by:

two sides of each feeding nozzle (2) at the bottom of the fluidized bed (1) are respectively provided with a steam input pipe (3), and each steam input pipe is inserted into the fluidized bed by 10-20 cm.

2. A fluidized bed reactor catalyst activation apparatus as set forth in claim 1, wherein:

the included angle between the central line of each steam input pipe (3) and the central line of the charging nozzle (2) is 15 degrees.