Method and device for passivating, cooling, destructively distilling and pyrolyzing anthracite coal

An anthracite and pyrolysis technology, applied in the field of coal chemical industry, can solve the problems of poor sealing effect, high water content and temperature of anthracite, and reduce calorific value, so as to maintain effective calorific value, facilitate long-term storage, and improve reaction rate.

Active Publication Date: 2018-03-27
SHAANXI COAL & CHEM IND GRP SHENMU TIANYUAN CHEM IND +1
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Problems solved by technology

The main problems currently existing in the rotary reactor test equipment and industrial equipment used in the production of anthracite by dry distillation pyrolysis technology are: On the one hand, during the cooling process of anthracite, due to the poor sealing effect of the inlet and outlet of the rotary reactor, excessive Oxygen enters the rotary kiln and oxidizes the material, resulting in anthracite with high oxygen content and low water content, which is easy to spontaneously ignite; In the middle, the dry distillation pyrolysis anthracite will inevitably spontaneously ignite, which makes the dry distillation pyrolysis anthracite inconvenient for long-term storage and long-distance transportation.
[0004] However, the content of adsorbed combustible gas and highly active volatile matter in the anthracite after passivation and cooling by the above-mentioned technology is still relatively high, which makes it inevitable that there is still a natural possibility in the storage process of anthracite; in addition, the above-mentioned method has passed The water content and temperature of anthracite after cooling and hydration reaction are also relatively high (the water content is 6-12%, and the temperature is 40-60°C). As we all know, the water content of standard anthracite is generally controlled at 4-6%. If the water content of the anthracite is too high, it will accelerate the weathering, cracking, and even spontaneous combustion of anthracite coal, which will seriously affect the storage of anthracite coal; second, it will also affect the combustion stability and heat conduction of anthracite coal, and reduce the effective calorific value; cost
In addition, the coal pile limit temperature of anthracite is 60°C. If this limit temperature is reached, anthracite is prone to naturalization. Therefore, the anthracite obtained by the above-mentioned technology through passivation cooling inevitably has the possibility of naturalization.

Method used

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  • Method and device for passivating, cooling, destructively distilling and pyrolyzing anthracite coal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The method for the passivation cooling dry distillation pyrolysis of anthracite provided in this embodiment comprises the following steps:

[0037] (1) cooling the anthracite after pyrolysis at 550°C to 250°C to obtain pretreated anthracite;

[0038] (2) reacting the anthracite pretreated in step (1) with an inert gas to activate the anthracite with oxygen to form a medium-temperature passivated anthracite at 110°C; wherein, the inert gas is flue gas and air at 120°C Or a mixture of nitrogen, the volume fraction of oxygen in the inert gas is 8%;

[0039] Then passivate the medium-temperature passivated anthracite at 110° C. to obtain anthracite at 220° C., wherein the temperature rise rate during the passivation process is 5° C. / min;

[0040] (3) cooling and hydrating the 220° C. anthracite of the step (2) with cooling water at 0° C. to obtain a low-temperature passivated anthracite with a water content of 4 wt % and a temperature of 45° C.;

[0041] Wherein, the mass...

Embodiment 2

[0043] The method for the passivation cooling dry distillation pyrolysis of anthracite provided in this embodiment comprises the following steps:

[0044] (1) cooling the anthracite after pyrolysis at 600°C to 220°C to obtain pretreated anthracite;

[0045] (2) reacting the anthracite pretreated in step (1) with an inert gas to activate the anthracite with oxygen to form a medium-temperature passivated anthracite at 140° C.; wherein the inactive gas is flue gas and air at 80° C. or a mixture of nitrogen, the volume fraction of oxygen in the inert gas is 20%;

[0046] Then passivate the medium-temperature passivated anthracite at 140° C. to obtain anthracite at 170° C., wherein the temperature rise rate during the passivation process is 10° C. / min;

[0047] (3) cooling and hydrating the 170° C. anthracite of the step (2) with cooling water at 0° C. to obtain a low-temperature passivated anthracite with a water content of 5.5 wt % and a temperature of 25° C.;

[0048] Wherein,...

Embodiment 3

[0050] The method for the passivation cooling dry distillation pyrolysis of anthracite provided in this embodiment comprises the following steps:

[0051] (1) cooling the anthracite after pyrolysis at 580°C to 230°C to obtain pretreated anthracite;

[0052] (2) reacting the anthracite pretreated in step (1) with an inert gas to activate the anthracite with oxygen to form a medium-temperature passivated anthracite at 130° C.; wherein the inactive gas is flue gas and air at 100° C. Or a mixture of nitrogen, the volume fraction of oxygen in the inert gas is 12%;

[0053] Then passivate the medium-temperature passivated anthracite at 130° C. to obtain anthracite at 200° C., wherein the temperature rise rate during the passivation process is 8° C. / min;

[0054] (3) cooling and hydrating the 200° C. anthracite of the step (2) with cooling water at 10° C. to obtain a low-temperature passivated anthracite with a water content of 4.5 wt % and a temperature of 31° C.;

[0055] Wherein...

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Abstract

The invention provides a method and a device for passivating, cooling, destructively distilling and pyrolyzing anthracite coal. According to the method provided by the invention, medium-temperature passivated anthracite coal is initiatively subjected to temperature-raising passivation and the content of combustible gas and volatile matters in micro-pores of the anthracite coal can be reduced to the greatest extent; spontaneous combustion of the anthracite coal is avoided and the anthracite coal can be stored for a long period; moreover, the moisture content of the anthracite coal prepared by the method is maintained in a range of 4 weight percent to 5.5 weight percent and is less than 6 weight percent to 12 weight percent in the prior art, so that weathering, cracking and spontaneous combustion of the anthracite coal are avoided; an effective heating mount of the anthracite coal is kept and the transportation amount of the anthracite coal is alleviated; meanwhile, the temperature of the passivated and cooled anthracite coal can be kept in a range of 25 DEG C to 45 DEG C after the method provided by the invention is used, so that the extreme temperature 60 DEG C of a coal pile of the anthracite coal is avoided and the spontaneous combustion of the anthracite coal can be further avoided.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a method and a device for passivating, cooling, carbonizing and pyrolyzing anthracite. technical background [0002] Anthracite, commonly known as white coal or red coal, is the coal with the largest degree of coalification. Anthracite has high fixed carbon content, low yield of volatile components, high density, high hardness, high ignition point, no smoke when burned, and a calorific value of about 6000-6500 kcal / kg. The main problems currently existing in the rotary reactor test equipment and industrial equipment used in the production of anthracite by dry distillation pyrolysis technology are: On the one hand, during the cooling process of anthracite, due to the poor sealing effect of the inlet and outlet of the rotary reactor, excessive Oxygen enters the rotary kiln and oxidizes the material, resulting in anthracite with high oxygen content and lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/00
CPCC10L5/00
Inventor 刘新张鹏赵欣宇查旭峰江昊沛
Owner SHAANXI COAL & CHEM IND GRP SHENMU TIANYUAN CHEM IND
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