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A roasting process that effectively prevents leaking air from contacting roasted materials

A roasting process and roasting technology, applied in chemical/physical processes, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as affecting product quality and difficult control of production operations, reducing pressure fluctuations and ensuring roasted products. Quality, the effect of simplifying the roasting process

Active Publication Date: 2018-11-02
NANJING TIANHUA CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The roasting process of zeolite catalyst requires that the roasted material should not be in contact with the ambient air, otherwise the moisture in the air will seriously affect the product quality; the roasting process needs to be carbonized first and then oxidized, and the production operation is not easy to control

Method used

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  • A roasting process that effectively prevents leaking air from contacting roasted materials
  • A roasting process that effectively prevents leaking air from contacting roasted materials
  • A roasting process that effectively prevents leaking air from contacting roasted materials

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A single roasting furnace realizes carbonization and oxidation reactions, and the structure is as follows image 3 shown. The carbonization process gas (process nitrogen) is added from the feed end 15, and the oxidation process gas is added from the discharge end 12; the dynamic and static seals 4 and 11, the dynamic and static seal 4 is the joint between the feed box and the furnace cylinder, and the feed The box does not move, and the furnace drum rotates; the dynamic and static seal 11 is the joint between the discharge box and the furnace drum.

[0037] The amount of induced air in the furnace is adjusted according to the size of the incoming air, which is generally different; when a furnace realizes the carbonization and oxidation process, the induced air 5 at the feed end is generally the carbonization process gas (such as process nitrogen) from the feed end + the movement of the feed end Air leakage at the sealing part 4 + gas generated by the carbonization reac...

Embodiment 2

[0040] like figure 1 Shown, the zeolite catalyst roasting technique involved in the present invention is described as follows:

[0041] This example adopts single roasting furnace roasting (the single roasting of example one) zeolite catalyst, and concrete technological process is as follows:

[0042]The zeolite catalyst is fed by the feeder 2 from the feed box 3 of the roaster. When the material moves to the discharge box 13 in the roaster, the material first enters the carbonization zone for drying, carbonization and roasting of the material, and then enters the oxidation zone for oxidation of the material. Reaction, the roasted material is discharged from the discharge end, if the furnace temperature is controlled at 610°C to 670°C, the roasting temperature can be controlled at about 600°C to 650°C.

[0043] During the drying and carbonization process of the material, the roasting furnace is fed with process gas, and the process nitrogen enters the carbonization zone from ...

Embodiment 3

[0048] In this example, two roasting furnaces are used in series to complete the roasting of the zeolite catalyst, which are respectively a carbonization roasting furnace and an oxidation roasting furnace. The specific process is as follows:

[0049] like Figure 2a , the zeolite catalyst is fed into the carbonization roaster from the feeder, and the carbonization reaction is completed during the process of the material moving to the discharge end in the carbonization roaster, and the carbonized material goes downstream for oxidation treatment. If the furnace temperature of the carbonization roasting furnace is controlled at 650°C to 700°C, the roasting temperature can be controlled at about 630°C to 680°C.

[0050] The process gas of the carbonization reaction enters the carbonization zone from the central tube of the carbonization process gas at the discharge end of the carbonization roasting furnace, and contacts with the roasted material countercurrently. The ambient air ...

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Abstract

The invention provides a roasting technology for effectively preventing contact of leaked-in air with a roasting material. The technology can prevent and avoid contact of leaked-in air with the roasting material in dynamic and static sealing positions of a roasting furnace, and can realize oxygen-poor and oxygen-rich roasting reactions in the same device. The technology comprises the following steps: the material is sent to the roasting furnace by a feeder and undergoes a roasting reaction in the furnace, and the roasted material is discharged out of the furnace from a discharging end, and goes to a subsequent process; technologic gas added to the roasting furnace in the roasting process simultaneously respectively outward induce wind from the feeding end and the discharging end of the roasting furnace, and the technologic gas, gas released in the roasting process and leaked-in air in the dynamic and static positions of the feeding and discharging ends of the roasting furnace are induced out as tail gas to control the micro-negative pressure in the roasting furnace; and the tail gas induced out from the feeding and discharging ends of the roasting furnace and filtered air are mixed and are sent to a bag deduster, the dedusted tail gas is introduced to a tail gas treatment system, and the captured roasting material is recycled.

Description

technical field [0001] The invention relates to a new technology of material roasting, which can be applied to the industrial production process of preventing air from leaking into the roasting material under micro-negative pressure operating conditions; for the need for oxygen-poor and oxygen-enriched reactions, and the need for frequent replacement of roasting materials The operating conditions have unique advantages, and its typical application is the roasting of zeolite catalysts for the treatment of automobile exhaust. Background technique [0002] At present, the main carrier used in automobile exhaust catalytic converters is small spheres of activated alumina of 3 mm to 4 mm. The technology is mature and the cost is low, but its absorption and purification rate is low and its service life is short. Zeolite catalyst is a new type of catalyst used to purify automobile exhaust. It is used as the carrier of automobile exhaust gas purification device, which can overcome th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/08B01J37/14
CPCB01J37/084B01J37/14
Inventor 李仁金王朝丽褚维平常青杨登吴向伟
Owner NANJING TIANHUA CHEM ENG
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