Shape-selective molecular sieve levigating and grading storage device

Abstract

The utility model relates to a shape-selective molecular sieve levigating, grading and storing device, and belongs to the field of shape-selective molecular sieve preparation. The combined process of crushing by the jet mill, dedusting by the bag-type dust collector, grading by the swinging vibrating screen and storing the finished product tank is adopted, the process is simple, the operation is convenient, safe and reliable, and the continuous production operation and the automatic production operation are realized. According to the utility model, unqualified molecular sieves can be repeatedly levigated, and the unqualified molecular sieves can be conveyed by an unqualified recovery line without power, so that the production requirements of energy conservation and consumption reduction are met. The utility model has high yield, and meets the requirements of no dust pollution and environmental protection.

Description

Technical Field

[0001] The utility model relates to a shape-selective molecular sieve grinding and grading storage device, belonging to the field of shape-selective molecular sieve preparation. Background Art

[0002] The finished product of shape-selective molecular sieve requires a maximum particle diameter of 60μm, a minimum particle diameter of 2μm, and an average particle diameter of 5-9μm. However, in the actual production process, it must undergo flash granulation and roasting production processes, and the particle diameter exceeds the range of the finished product. On the one hand, during the flash granulation stage, due to factors such as pressure fluctuations and granulation aperture wear, the droplets collide with each other and adhere during the granulation process. On the other hand, during the roasting process, the molecular sieve undergoes deamination, dealuminization, dehydroxylation, silicon migration structure rearrangement reactions under the action of high-temperature water vapor-containing air in the roasting drum, which causes the single cell to shrink, causing the particle diameter to change. The semi-finished product after roasting must be ground and screened to achieve the quality indicators of the product. Summary of the invention

[0003] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0004] A shape-selective molecular sieve grinding and grading storage device comprises an airflow pulverizer, a bag dust collector, a swing vibrating screen, an induced draft fan and a finished product tank; the raw material feed line is connected to the airflow pulverizer, and the airflow pulverizer is connected to the bag dust collector through an ascending airflow conveying pipe; the top of the bag dust collector is connected to the induced draft fan, and the induced draft fan is connected to the tail gas treatment unit; the bottom of the bag dust collector is provided with a discharge valve, the bottom of the discharge valve is connected to the swing vibrating screen, and the bottom of the swing vibrating screen is connected to the finished product tank; the bottom of the airflow pulverizer is provided with a compressed air inlet pipeline, and the swing vibrating screen is provided with an unqualified recovery line, one end of the unqualified recovery line is connected to the swing vibrating screen, and the other end is connected to the raw material feed line; the bottom surface of the swing vibrating screen is higher than the airflow pulverizer; the top of the finished product tank is provided with a dust removal line connected to the induced draft fan inlet pipeline. Through the centrifugal force of the swing vibrating screen and the height difference with the airflow pulverizer, the unqualified shape-selective molecular sieve enters the raw material feed line for secondary grinding.

[0005] Preferably, a one-way valve is provided at the inlet of the induced draft fan, and the direction of the one-way valve is from the bag filter to the induced draft fan.

[0006] Preferably, a rapper is provided on the outside of the bag filter.

[0007] Preferably, the discharge valve is a star-shaped discharge valve.

[0008] The calcined molecular sieve material enters the air flow mill. The compressed air is accelerated into supersonic airflow through the Laval nozzle and then injected into the crushing area to fluidize the material. The airflow expands into a fluidized bed, suspends and boils, and collides with each other, so that each particle has the same motion state. In the crushing area, the accelerated particles collide and crush each other at the intersection of each nozzle.

[0009] The crushed material, under the action of the induced draft fan, passes through the ascending air flow conveying pipe for dilute phase cooling and temperature reduction, and then enters the bag dust collector for gas-solid separation. The collected selective molecular sieve material enters the swing vibrating screen for graded separation through the star-shaped discharge valve, and the fine dust tail gas after dust removal by the bag dust collector enters the tail gas treatment unit through the induced draft fan.

[0010] After the molecular sieve from the star-shaped discharge valve enters the swing vibrating screen, the material with lighter specific gravity moves close to the screen surface under the action of low speed, and then the material moves involutely on the screen by adjusting the longitudinal angle and tangential angle. The material travels a relatively long distance in a smaller area, which improves the screening accuracy. The fine powder that meets the particle size requirement is screened out through the vibrating screen classification and enters the finished product tank for storage from the bottom of the vibrating screen. The coarse powder that does not meet the particle size requirement returns to the air flow mill from the top of the vibrating screen for further crushing.

[0011] The beneficial effects of the utility model are:

[0012] 1. The utility model adopts the combined process of air flow mill pulverizing, bag dust collector dust removal, swing vibration screen grading and finished product tank storage. The process is simple, the operation is convenient, safe and reliable, and the continuous production operation and automated production operation are realized.

[0013] 2. The utility model can repeatedly grind unqualified molecular sieves, and the unqualified recovery line can complete the shape-selective molecular sieve transportation without power, meeting the production needs of energy saving and consumption reduction.

[0014] 3. The utility model has a high yield rate, is dust-free and meets environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the utility model.

[0016] In the figure: 1 is an air flow mill; 2 is a bag filter; 3 is a vibrator; 4 is a discharge valve; 5 is a swing vibrating screen; 6 is an induced draft fan; 7 is a finished product tank; 11 is a raw material feed line; 12 is an ascending air flow conveying pipe; 13 is a compressed air inlet pipeline; 51 is an unqualified recovery line; 61 is a one-way valve; 71 is a dust removal line. DETAILED DESCRIPTION

[0017] Example 1

[0018] A shape-selective molecular sieve grinding and grading storage device comprises an airflow pulverizer 1, a bag dust collector 2, a swing vibrating screen 5, an induced draft fan 6 and a finished product tank 7; the raw material feed line 11 is connected to the airflow pulverizer 1, and the airflow pulverizer 1 is connected to the bag dust collector 2 through an ascending airflow conveying pipe 12; the top of the bag dust collector 2 is connected to the induced draft fan 6, and the induced draft fan 6 is connected to an exhaust gas treatment unit; a discharge valve 4 is provided at the bottom of the bag dust collector 2, and a swing vibrating screen 5 is connected below the discharge valve 4, and a finished product tank 7 is connected below the swing vibrating screen 5; a compressed air inlet pipeline 13 is provided at the bottom of the airflow pulverizer 1, and an unqualified recovery line 51 is provided on the swing vibrating screen 5, and one end of the unqualified recovery line 51 is connected to the swing vibrating screen 5 and the other end is connected to the raw material feed line 11; the bottom surface of the swing vibrating screen 5 is arranged higher than the airflow pulverizer 1; a dust removal line 71 connected to the inlet pipeline of the induced draft fan 6 is provided on the top of the finished product tank 7.

[0019] A one-way valve 61 is provided at the inlet of the induced draft fan 6 , and the direction of the one-way valve 61 is from the bag filter 2 to the induced draft fan 6 .

[0020] A rapper 3 is disposed outside the bag filter 2 .

[0021] The discharge valve 4 is a star-shaped discharge valve.

[0022] The utility model adopts a combined process of air flow mill 1 for pulverizing, bag filter 2 for dust removal, swing vibration screen 5 for grading, and finished product tank 7 for storage. The process is simple, the operation is convenient, safe and reliable, and the continuous production operation and the automatic production operation are realized. The unqualified molecular sieve can be repeatedly ground, and the unqualified recovery line 71 can complete the shape-selective molecular sieve transportation without power, meeting the production needs of energy saving and consumption reduction. The finished product rate is high, and there is no dust pollution, which meets the environmental protection requirements.

Claims

1. A shape-selective molecular sieve grinding and grading storage device, characterized in that: The invention comprises an air flow pulverizer (1), a bag dust collector (2), a swing vibrating screen (5), an induced draft fan (6) and a finished product tank (7); a raw material feeding line (11) is connected to the air flow pulverizer (1), and the air flow pulverizer (1) is connected to the bag dust collector (2) through an ascending air flow conveying pipe (12); the top of the bag dust collector (2) is connected to the induced draft fan (6), and the induced draft fan (6) is connected to an exhaust gas treatment unit; a discharge valve (4) is provided at the bottom of the bag dust collector (2), and the lower part of the discharge valve (4) is connected to the swing vibrating screen (5), the lower part of the swing vibrating screen (5) is connected to the finished product tank (7); the bottom of the air flow pulverizer (1) is provided with a compressed air inlet pipeline (13), the swing vibrating screen (5) is provided with an unqualified recovery line (51), one end of the unqualified recovery line (51) is connected to the swing vibrating screen (5), and the other end is connected to the raw material feeding line (11); the bottom surface of the swing vibrating screen (5) is higher than the air flow pulverizer (1); the top of the finished product tank (7) is provided with a dust removal line (71) connected to the inlet pipeline of the induced draft fan (6).

2. A shape-selective molecular sieve grinding, grading and storage device according to claim 1, characterized in that: A one-way valve (61) is provided at the inlet of the induced draft fan (6), and the direction of the one-way valve (61) is from the bag filter (2) to the induced draft fan (6).

3. A shape-selective molecular sieve grinding, grading and storage device according to claim 1, characterized in that: A rapper (3) is provided on the outside of the bag filter (2).

4. A shape-selective molecular sieve grinding, grading and storage device according to claim 1, characterized in that: The discharge valve (4) is a star-shaped discharge valve.

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