CN112693829B

CN112693829B - Vibrating trough conveyor and method for treating catalyst particles and application thereof

Info

Publication number: CN112693829B
Application number: CN201911013877.3A
Authority: CN
Inventors: 马坚; 张競业; 万荣欢; 裘潜麟; 陈世华; 闫博文; 陈鑫宇
Original assignee: China Petroleum and Chemical Corp; Sinopec Catalyst Co; Sinopec Nanjing Catalyst Co Ltd
Current assignee: China Petroleum and Chemical Corp; Sinopec Catalyst Co; Sinopec Nanjing Catalyst Co Ltd
Priority date: 2019-10-23
Filing date: 2019-10-23
Publication date: 2022-11-29
Anticipated expiration: 2039-10-23
Also published as: CN112693829A

Abstract

The invention relates to the field of catalyst preparation, and discloses a vibrating trough conveyor, a treatment method of catalyst particles and application of the treatment method. The vibrating groove type conveyor comprises a conveying groove, a cover body arranged above the conveying groove and a polarization motor; a material inlet (1) and a material outlet (7) are respectively arranged at two ends of the conveying groove; more than one spray head (3) is arranged at the top in the cover body; the polarization motor is used for enabling the materials to form vortex perpendicular to the conveying direction in the conveying groove. The vibrating trough conveyor and the catalyst particle treatment method have the advantages of simplicity, easiness in implementation and low loss.

Description

Vibrating trough conveyor and method for treating catalyst particles and application thereof

Technical Field

The invention relates to the field of catalyst preparation, in particular to a vibration groove type conveyor, a treatment method of catalyst particles and application of the treatment method.

Background

The water content of the solid particles after high-temperature roasting is generally below 5 percent, and if the subsequent treatment process involving the aqueous solution is carried out, a pre-wetting measure is needed to be adopted, so that the solid particles firstly and gently absorb part of water, the water content is increased to be above 20 percent, and the particles can be prevented from directly entering water and being exploded due to over violent heat release.

The pre-wetting method adopted in the past is to uniformly put quantitative solid particles into circulating water, and the heat released by water absorption is taken away by the circulating water. However, this method is relatively complicated and requires control of the feeding speed; at the same time, a small part of the particles will burst and be lost. The other method is to stand still for moisture absorption, tray the solid particles and place in a closed and damp cabin for more than 20 hours. During the period, the moisture absorption is uniform, and manual material turning is needed. The method has high labor intensity, and has certain loss due to the problems of throwing and raising dust on site during tray loading and dumping. In addition, there are methods of placing solid particles in a rotating apparatus (e.g., a sugar-coating pan, a tumbler, etc.) while rotating and spraying water. Due to the continuous rotation, the solid particles and the wall of the container rub against each other, and about 15% of loss is caused.

CN208300916U discloses an aquatic products fodder granulation machine with humidification function, adopts extrusion mechanism, in transportation process, to the fodder granule water spray, carries out the humidification. This method causes some abrasion to the particles. CN109420535A discloses a grain humidifying device and a grain humidifying method, which still adopts a screw pushing mechanism to spray and humidify in the conveying process. The propeller blade can cause the abrasion of the materials due to the extrusion effect in the process of pushing the materials.

Disclosure of Invention

The invention aims to solve the problems of large material loss, complicated process, high labor intensity, poor operation environment and the like in the prior art, and provides a vibrating trough conveyor and a catalyst particle processing method.

In order to achieve the above object, an aspect of the present invention provides a vibrating trough conveyor, including a conveying trough, a cover disposed above the conveying trough, and a polarization motor; wherein, both ends of the conveying groove are respectively provided with a material inlet and a material outlet; more than one spray head is arranged at the top in the cover body; the polarization motor is used for enabling the materials to form eddy currents perpendicular to the conveying direction in the conveying groove.

Preferably, the vibrating trough conveyor further comprises support springs, and the conveyor trough is connected with the conveyor base through the support springs.

Preferably, the polarization motor is disposed below the conveying trough.

Preferably, the material outlet end of the conveying trough is provided with an adjustable weir plate.

Preferably, the spray head is a high pressure spray head and/or a two fluid spray head.

Preferably, the top of the cover body is provided with an exhaust hole, and the exhaust hole is used for exhausting water vapor inside the cover body.

In a second aspect, the present invention provides a method for treating catalyst particles, wherein the vibrating trough conveyor of the present invention is used to transport the catalyst particles, and the catalyst particles are pre-wetted or impregnated by using a spray head while being transported.

Preferably, the bed thickness of the catalyst particles is from 5 to 40cm, preferably from 20 to 35cm, more preferably from 25 to 32cm.

Preferably, the residence time of the catalyst particles is from 30 to 90min.

Preferably, the attrition rate of the treated catalyst particles is 0.3 wt% or less.

A third aspect of the present invention provides the use of the vibrating trough conveyor of the present invention as described above for pre-wetting of particulate material.

Through the technical scheme, the vibration groove type conveyor and the catalyst particle treatment method are simple and easy to operate, and the vibration eddy current is formed through the vibration groove type conveying equipment, so that the conveying and the pre-wetting of materials can be realized simultaneously; the treatment process is closed, the operation is automatic and continuous, the discharged water vapor is pumped away by the air suction cover, and the operation environment is clean and tidy. Because the vibration conveying adopts the micro-throwing principle, namely a certain exciting force is generated by the polarization motor (6), the material overcomes the self gravity and moves forward in a vortex state towards the preset direction. The conveying process is mild, no extrusion exists between materials, and the loss is extremely low. With the device of the invention, water or impregnating solution can be sprayed, so that the device can be used for pre-wetting or impregnating process of materials.

Drawings

Fig. 1 is a schematic view of the structure of the vibrating trough conveyor of the present invention.

Description of the reference numerals

1. Material inlet 2, exhaust hole

3. Spray nozzle 4, adjustable weir plate

5. Supporting spring 6 and polarization motor

7. Material outlet

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

In the present invention, the use of directional terms such as "upper, lower, left, right" generally means the corresponding directions in the drawings, unless otherwise specified.

The invention provides a vibration groove type conveyor, as shown in fig. 1, the vibration groove type conveyor comprises a conveying groove, a cover body arranged above the conveying groove, and a polarization motor 6; wherein, both ends of the conveying groove are respectively provided with a material inlet and a material outlet; more than one spray head is arranged at the top in the cover body; the polarizing motor 6 is used to form a vortex of the material in the trough perpendicular to the conveying direction.

In the invention, the spray head 3 is used for spraying spray liquid such as water, impregnation liquid and the like, so that the materials can be uniformly mixed with the spray liquid by utilizing the vibration of the materials in the process of conveying the materials by the vibrating trough conveyor, and the spraying and conveying processes can be simultaneously completed.

According to the invention, the vibrating trough conveyor preferably also comprises supporting springs 5, by means of which supporting springs 5 the conveyor trough is connected to the conveyor base.

In the present invention, the conveying chute of the vibrating chute conveyor, the polarization motor 6, and the support spring 5 may be provided according to a conventional vibrating chute conveyor, and are not particularly limited. The polarization motor 6 is used for providing power for conveying materials, and preferably, the polarization motor 6 is arranged below the conveying trough. For example, two polarizing motors 6 may be fixed to both sides below the conveying trough and symmetrically arranged with respect to the conveying direction of the conveying trough.

According to a preferred embodiment of the invention, the material outlet 7 end of the trough is provided with an adjustable weir plate 4. By arranging the adjustable weir plate 4, the thickness and the retention time of the material layer in the conveying trough can be controlled according to requirements.

According to the present invention, the spray head 3 is not particularly limited as long as it can uniformly atomize the spray liquid. The number of the spray heads 3 can be set according to the length of the conveying trough, and can be more than 2, for example, 3-8, 5-6, etc. In particular, the spray head 3 may be a high-pressure spray head, a two-fluid spray head or other type of spray head.

According to the invention, by arranging the cover body, the conveying groove is formed in a closed form, and the inner part of the conveying groove is a cavity, so that the cleaning is convenient. And, according to a preferred embodiment of the present invention, the top of the cover body is provided with a gas discharge hole 2, and the gas discharge hole 2 is used for discharging moisture generated inside the cover body due to spraying. The air vent 2 can be arranged at one end of the material outlet 7 and/or one end of the material inlet 1 on the cover body, and can be matched with an air pump to exhaust moisture.

The second aspect of the present invention provides a method for treating catalyst particles, which uses the above-described vibrating trough conveyor of the present invention to transport the catalyst particles while pre-wetting or impregnating the catalyst particles with the spray heads 3.

In the process of conveying by using the vibrating trough conveyor, the spray liquid such as water or impregnating liquid is sprayed by the spray head 3, so that the materials and the spray liquid can be uniformly mixed by using the material vibration generated in the conveying process of the vibrating trough conveyor, and the purposes of simultaneously conveying the materials and pre-wetting/impregnating the materials are achieved. As the impregnation liquid, an active component solution required in the impregnation of the catalyst, for example, an active component solution containing a metal, whose composition and concentration are set as required, may be used as required.

According to the invention, the initial water content of the catalyst particles is preferably from 1 to 8% by weight, preferably from 2 to 4% by weight. The spraying speed of the spraying liquid is preferably 100 to 200L/h, and more preferably 120 to 150L/h.

In order to improve the mixing effect of the material and the spray liquid, the thickness of the bed of the catalyst particles is preferably 5-40cm, preferably 20-35cm, more preferably 25-32cm, even more preferably 25-30cm, and even more preferably 28-30cm.

In order to further improve the mixing effect of the material and the spray liquid, the residence time of the catalyst particles is preferably 30-90min, and more preferably 45-60min.

The method for treating the catalyst particles can reduce the loss of the catalyst particles in the pre-wetting/impregnating process to the maximum extent, and particularly, the loss rate of the treated catalyst particles is less than 0.3 weight percent, preferably 0 to 0.2 weight percent; the treatment capacity can reach more than 440 kg/h; the water content after pre-wetting is up to 15 wt% or more, preferably 20-30 wt%. The method realizes automatic and continuous stable production, has small loss and normal product quality, and can meet the process requirements.

A third aspect of the present invention provides the use of a vibrating trough conveyor according to the invention as described above for the pre-wetting of particulate material. The vibrating groove type conveyor can be used for simultaneously pre-wetting and conveying granular materials, so that the vibrating groove type conveyor is convenient to be matched with other processes in the whole process flow and is convenient for integrated production.

The present invention will be described in detail below by way of examples. In the following examples, the catalyst particles were 4A molecular sieve beads, and the catalyst from Nanjing division of China petrochemical Co., ltd is a commercially available NWA.

Example 1

The impregnation of catalyst particles was carried out using the vibrating trough conveyor of the present invention, which, as shown in fig. 1, comprised a conveying trough, a cover disposed above the conveying trough, a polarization motor 6, a support spring 5, and a conveyor base; the two ends of the conveying groove are respectively provided with a material inlet 1 and a material outlet 7, and the material outlet 7 is provided with an adjustable weir plate 4; 3 two-fluid atomizing nozzles 3 for atomizing water are dispersedly arranged at the top in the cover body at equal intervals, one end of the top of the cover body, which is close to the material outlet 7, is provided with an exhaust hole 2, and water vapor generated by prewetting is exhausted by an air extractor; the polarization motors 6 are used for enabling materials to form eddy currents perpendicular to the conveying direction in the conveying groove, the two polarization motors 6 are fixed on two sides below the conveying groove and are symmetrically arranged relative to the conveying direction of the conveying groove, and the conveying groove is connected with the conveyor base through the supporting springs 5.

The initial water content of the catalyst particles was 3 wt%, the spraying speed was 150L/h, the bed thickness of the catalyst particles was controlled to 30cm by adjusting the adjustable weir plate 4, the residence time was 50min, the throughput was 440Kg/h, and the loss was 0.1 wt%.

Examples 2 to 7

Impregnation of the catalyst particles was carried out using the method in example 1, except that the bed thickness of the catalyst particles was as in table 1, and the attrition of the final catalyst particles is as shown in table 1.

In tables 1 to 3, the water content after the prewetting was rated as O and the water content after the prewetting was rated as X.

TABLE 1

Examples 8 to 11

Impregnation of the catalyst particles was carried out using the method of example 1 except that the spraying rate was carried out as in table 2 and the attrition of the final catalyst particles is shown in table 2.

TABLE 2

As shown in table 2, although the catalyst particle attrition could be controlled by selecting a lower spray rate, it may result in a moisture content after pre-wetting at the completion of the transfer that does not meet the pre-wetting requirement.

Examples 12 to 15

Impregnation of the catalyst particles was carried out using the method of example 1 except that the residence time was as in table 3 and the attrition of the final catalyst particles is as in table 3.

TABLE 3

The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including various technical features being combined in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.

Claims

1. A method for treating catalyst particles is characterized in that a vibration groove type conveyor is used for conveying the catalyst particles, the catalyst particles are pre-wetted or impregnated by a spray head (3) while being conveyed,

the vibrating groove type conveyor comprises a conveying groove, a cover body arranged above the conveying groove and a polarization motor (6);

the device comprises a conveying trough, a material inlet (1) and a material outlet (7) which are arranged at two ends of the conveying trough respectively, wherein an adjustable weir plate (4) is arranged at the end of the material outlet (7) of the conveying trough, and the adjustable weir plate (4) is used for adjusting the thickness of a material layer of catalyst particles;

more than one spray head (3) is arranged at the top in the cover body, an exhaust hole (2) is formed in the top of the cover body, and the exhaust hole (2) is used for exhausting water vapor in the cover body;

the polarization motor (6) is used for enabling the materials to form a vortex perpendicular to the conveying direction in the conveying groove;

the thickness of the material layer of the catalyst particles is 20-35cm, the retention time of the catalyst particles is 45-90min, and the spraying speed of the spray head (3) is 120-200L/h.

2. The method for the treatment of catalyst particles according to claim 1, wherein the vibrating trough conveyor further comprises support springs (5), and the conveyor trough is connected to the conveyor base by the support springs (5).

3. The method for treating catalyst particles according to claim 1, wherein the polarization motor (6) is disposed below the conveying trough.

4. A method for the treatment of catalyst particles according to any of claims 1-3, wherein the spray head (3) is a high pressure spray head and/or a two fluid spray head.

5. The method of treating catalyst particles according to claim 1, wherein the catalyst particles have a bed thickness of 25 to 32cm.

6. The method of claim 1, wherein the catalyst particles have a residence time of 50 to 90min.

7. The method of claim 6, wherein the residence time of the catalyst particles is 50-60min.

8. The method of treating catalyst particles according to claim 1, wherein the spray velocity of the spray head (3) is 120 to 170L/h.

9. The method of treating catalyst particles according to any one of claims 1 to 3, wherein the attrition rate of the catalyst particles after treatment is 0.3 wt% or less.

10. Use of a method of treating catalyst particles according to any one of claims 1 to 9 in the pre-wetting of particulate material.