Tail gas treatment and utilization device for carbon black production

Abstract

The utility model discloses a tail gas treatment and utilization device for carbon black production, and relates to the technical field of carbon black production, an outlet of a tail gas tank is communicated to an inlet of an inner jacket of a preheating tank, an outlet of the inner jacket is communicated to a pressure swing adsorber, and an outlet of the pressure swing adsorber is communicated with a nitrogen tank; and an outlet of the nitrogen tank is communicated to a lower discharge pipeline of the reaction furnace. Tail gas generated by a reaction furnace enters a tail gas tank to be collected, then heat carried in the tail gas enters an inner jacket of a preheating tank to preliminarily heat raw oil in the preheating tank, the tail gas subjected to heat exchange enters a pressure swing adsorber, other gas is adsorbed, nitrogen is relatively weak in adsorbability, is left in a gas phase and enters a nitrogen tank, and the tail gas enters the preheating tank. And the collected nitrogen can dilute a high-concentration carbon black product produced in the reaction furnace, so that the concentration of carbon black in airflow is reduced, subsequent treatment procedures such as collection, separation and cooling are easier to carry out, and the conditions of agglomeration, equipment blockage and the like caused by over-high carbon black concentration are prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to carbon black production technical field, concretely relates to a tail gas treatment and utilization device for carbon black production. BACKGROUND

[0002] A large amount of tail gas is produced in carbon black production, which contains carbon monoxide, hydrogen, carbon dioxide, nitrogen and other components, among which the content of nitrogen is relatively high, about 37.82%, at present, the tail gas is often introduced into a special incinerator, and the combustible gas such as carbon monoxide and hydrogen is fully combusted under sufficient oxygen, and the released heat is used for preheating raw oil, drying carbon black products or heating production workshop. For example, many carbon black plants use tail gas as the heat source of the dryer, replace the traditional coal-fired or gas heating mode, realize the internal recycling of energy, and reduce the production cost, but the nitrogen is not recycled, which causes waste, direct emission is not friendly to the environment, and the utilization rate of tail gas is low. SUMMARY

[0003] The utility model solves the technical problem that: in view of the deficiency of prior art, provide a tail gas treatment and utilization device for carbon black production, the utilization rate of tail gas is high, reduces the waste, and is friendly to the environment.

[0004] To solve the above technical problems, the technical scheme of the utility model is:

[0005] A tail gas treatment and utilization device for carbon black production, including the reaction furnace, the upper inlet of the reaction furnace is connected with the preheating tank through the pipeline, the inlet of the preheating tank is connected with the raw oil tank through the pipeline, the upper outlet of the reaction furnace is connected with the tail gas tank through the pipeline, the outlet of the tail gas tank is connected to the inner jacket inlet of the preheating tank through the pipeline, the outlet of the inner jacket is connected to the pressure swing adsorber through the pipeline, the outlet of the pressure swing adsorber is connected with the nitrogen tank through the pipeline, and the outlet of the nitrogen tank is connected to the lower discharge pipeline of the reaction furnace.

[0006] As an improved technical scheme, the lower discharge pipeline of the reaction furnace is provided with a static mixer, the outlet of the nitrogen tank is connected to the inlet of the static mixer through the pipeline, and the outlet of the static mixer is connected with the carbon black product tank through the pipeline.

[0007] As an improved technical scheme, the upper outlet of the pressure swing adsorber is connected with the burner through the pipeline, the outlet of the burner is connected with the first dryer through the pipeline, and the outlet of the first dryer is connected to the upper inlet of the outer jacket of the preheating tank through the pipeline.

[0008] As an improved technical scheme, the lower outlet of the outer jacket is connected with the second dryer through the pipeline, and the outlet of the second dryer is connected with the carbon dioxide tank through the pipeline.

[0009] As an improved technical solution, the outlet of the carbon dioxide tank is communicated to the reaction furnace through a pipeline.

[0010] As an improved technical solution, the outlet of the carbon dioxide tank is communicated to the reaction furnace through a pipeline.

[0011] Due to the adoption of the above technical scheme, the present application has the following beneficial effects:

[0012] The utility model discloses a tail gas treatment utilization device for carbon black production, including the reaction furnace, the upper inlet of reaction furnace is communicated with preheating tank through the pipeline, the inlet of preheating tank is communicated with raw oil tank through the pipeline, the upper outlet of reaction furnace is communicated with tail gas tank through the pipeline, the outlet of tail gas tank is communicated to the inner jacket inlet of preheating tank through the pipeline, the outlet of inner jacket is communicated to pressure swing adsorber through the pipeline, the outlet of pressure swing adsorber is communicated with nitrogen tank through the pipeline, the outlet of nitrogen tank is communicated to the lower outlet pipeline of reaction furnace. The tail gas generated by the reaction furnace enters the tail gas tank to collect, and then the heat carried in the tail gas enters the inner jacket of the preheating tank, the raw oil in the preheating tank is preliminarily heated, the tail gas after heat exchange enters the pressure swing adsorber, other gases are adsorbed, nitrogen has weak adsorption, remains in the gas phase and enters the nitrogen tank, and the collected nitrogen can dilute the high-concentration carbon black product produced in the reaction furnace, reduce the carbon black concentration in the gas flow, make the subsequent collection, separation, cooling and other treatment processes easier to carry out, and prevent agglomeration, equipment blockage and other conditions caused by too high carbon black concentration.

[0013] The lower outlet pipeline of the reaction furnace is provided with a static mixer, the outlet of the nitrogen tank is communicated to the inlet of the static mixer through a pipeline, and the outlet of the static mixer is communicated with a carbon black product tank. The static mixer can mix the carbon black and nitrogen more uniformly. As an inert gas, nitrogen can quickly fill the gaps between carbon black particles, isolate air, avoid contact between carbon black and oxygen, create an oxygen-free storage and transportation environment for carbon black, maintain the original performance of the product to the greatest extent, and the nitrogen molecules can be adsorbed on the surface of the carbon black particles, play a role similar to "lubricant", reduce the adhesion between particles, make the carbon black flow more easily in the subsequent conveying, packaging and use process, reduce pipeline blockage and poor discharging, and facilitate automatic production operation.

[0014] The upper outlet of the pressure swing adsorber is communicated with a combustor through a pipeline, the outlet of the combustor is communicated with a first dryer through a pipeline, and the outlet of the first dryer is communicated with the upper inlet of the outer jacket of the preheating tank through a pipeline. Impurity gas adsorbed by the pressure swing adsorber can be desorbed by reducing pressure, after nitrogen in the carbon black tail gas is removed, residual carbon monoxide and hydrogen can be combusted in the combustor to generate carbon dioxide and water, the preheating tank is heated after drying by the first dryer, and the inner jacket is matched, so that rapid heating of materials in the preheating tank can be realized, and the preheating period is shortened.

[0015] The lower outlet of the outer jacket is communicated with a second dryer through a pipeline, and the outlet of the second dryer is communicated with a carbon dioxide tank through a pipeline. The gas after heat exchange enters the second dryer again to remove water, and finally high-purity carbon dioxide gas is collected.

[0016] The outlet of the carbon dioxide tank is communicated with the reaction furnace through a pipeline, carbon dioxide is introduced into the reaction furnace, the gas composition in the furnace can be adjusted, local overheating or excessive reaction is avoided, the reaction process is stabilized, and the carbon black generation reaction is uniformly and stably carried out. Because carbon dioxide has a certain heat capacity, it can absorb and buffer excess heat, prevent temperature from rising sharply, and cause product quality fluctuations, such as uneven particle size distribution.

[0017] The outlet of the raw oil tank is communicated with the lower inlet of the outer jacket through a pipeline, and the upper outlet of the outer jacket is communicated with the inlet of the preheating tank through a pipeline. When the temperature of the raw oil in the preheating tank is high, the temperature of the materials in the preheating tank can be lowered by introducing raw oil with lower temperature into the outer jacket, and the raw oil after heat exchange enters the raw oil tank, so that the temperature of the materials in the raw oil tank is improved, the preheating time of the raw oil entering the preheating tank is shortened, and in addition, after the raw oil contacts with carbon dioxide, the weakly oxidizing carbon dioxide can mildly oxidize part of impurities that are easy to be oxidized, and convert them into substances with stronger polarity and easier separation. Subsequently, impurities can be removed by means of simple separation methods such as distillation and extraction, and the purity of the raw oil is improved, which lays a foundation for producing high-quality carbon black. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model will be further explained in connection with the drawings and embodiments.

[0019] Figure 1 It is a structure schematic view of the utility model embodiment.

[0020] Figure 2 It is Figure 1 It is a sectional view of the preheating tank in the embodiment.

[0021] Wherein: 1, reaction furnace; 2, preheating tank; 3, raw oil tank; 4, tail gas tank; 5, inner jacket; 6, pressure swing adsorber; 7, nitrogen tank; 8, static mixer; 9, carbon black product tank; 10, burner; 11, first dryer; 12, outer jacket; 13, second dryer; 14, carbon dioxide tank. DETAILED DESCRIPTION

[0022] The utility model is further illustrated below in combination with the drawings and examples.

[0023] As Figures 1-2 shown, a tail gas treatment and utilization device for carbon black production, comprising a reaction furnace 1, the upper inlet of the reaction furnace 1 is communicated with a preheating tank 2 through a pipeline, the inlet of the preheating tank 2 is communicated with a raw oil tank 3 through a pipeline, the upper outlet of the reaction furnace 1 is communicated with a tail gas tank 4 through a pipeline, the outlet of the tail gas tank 4 is communicated to the inlet of the inner jacket 5 of the preheating tank 2 through a pipeline, the outlet of the inner jacket 5 is communicated to a pressure swing adsorber 6 through a pipeline, the outlet of the pressure swing adsorber 6 is communicated with a nitrogen tank 7 through a pipeline, and the outlet of the nitrogen tank 7 is communicated to the lower discharge pipeline of the reaction furnace 1. The tail gas generated by the reaction furnace 1 enters the tail gas tank 4 for collection, and then the heat carried by the tail gas enters the inner jacket 5 of the preheating tank 2 to preliminarily heat the raw oil in the preheating tank 2. After heat exchange, the tail gas enters the pressure swing adsorber 6, other gases are adsorbed, nitrogen has weak adsorption and remains in the gas phase and enters the nitrogen tank 7, and the collected nitrogen can dilute the high-concentration carbon black product produced in the reaction furnace 1, reduce the carbon black concentration in the gas flow, and make the subsequent collection, separation, cooling and other processing procedures easier to carry out, preventing agglomeration, equipment blockage and other conditions caused by too high carbon black concentration.

[0024] A static mixer 8 is arranged on the lower discharge pipeline of the reaction furnace 1, the outlet of the nitrogen tank 7 is communicated to the inlet of the static mixer 8 through a pipeline, and the outlet of the static mixer 8 is communicated with a carbon black product tank 9 through a pipeline. Carbon black has strong adsorption, is easy to adsorb oxygen when exposed to air, and causes slow oxidation, resulting in a decrease in the quality of carbon black, such as changing the surface chemical activity and affecting the stability of particle size distribution. The use of the static mixer 8 can mix carbon black and nitrogen more uniformly. As an inert gas, nitrogen can quickly fill the gaps between carbon black particles, isolate air, avoid contact between carbon black and oxygen, create an oxygen-free storage and transportation environment for carbon black, and maintain the original performance of the product to the greatest extent. In addition, nitrogen molecules can be adsorbed on the surface of carbon black particles, playing a role similar to a "lubricant", reducing the adhesion between particles, making carbon black flow more easily in the subsequent conveying, packaging and use processes, reducing pipeline blockage, poor discharge and other problems, and facilitating automated production operations.

[0025] The upper outlet of the pressure swing adsorber 6 is communicated with a combustor 10 through a pipeline, the outlet of the combustor 10 is communicated with a first dryer 11 through a pipeline, and the outlet of the first dryer 11 is communicated with the upper inlet of the outer jacket 12 of the preheating tank 2 through a pipeline. The impurity gas adsorbed by the pressure swing adsorber 6 can be desorbed by reducing the pressure, and after the carbon black tail gas is removed of nitrogen, the remaining carbon monoxide and hydrogen can be combusted in the combustor 10 to produce carbon dioxide and water, which is dried by the first dryer 11 and then used to heat the preheating tank 2, so that the material in the preheating tank 2 can be rapidly heated and the preheating period is shortened.

[0026] The lower outlet of the outer jacket 12 is communicated with a second dryer 13 through a pipeline, and the outlet of the second dryer 13 is communicated with a carbon dioxide tank 14 through a pipeline. The gas after heat exchange is again introduced into the second dryer 13 for water removal, and finally high-purity carbon dioxide gas is collected.

[0027] The outlet of the carbon dioxide tank 14 is communicated with the reaction furnace 1 through a pipeline, and the carbon dioxide introduced into the reaction furnace 1 can adjust the gas composition in the furnace to avoid local overheating or excessively violent reaction, which is helpful to stabilize the reaction process and make the carbon black generation reaction proceed uniformly and stably. Because carbon dioxide has a certain heat capacity, it can absorb and buffer excess heat to prevent temperature from rising sharply and causing product quality fluctuations such as uneven particle size distribution.

[0028] The outlet of the raw oil tank 3 is communicated with the lower inlet of the outer jacket 12 through a pipeline, and the upper outlet of the outer jacket 12 is communicated with the inlet of the preheating tank 2 through a pipeline. When the temperature of the raw oil in the preheating tank 2 is high, the temperature of the material in the preheating tank 2 can be lowered by introducing raw oil with lower temperature into the outer jacket 12, and the raw oil after heat exchange is introduced into the raw oil tank 3 to raise the temperature of the material in the raw oil tank 3, shorten the preheating time of the raw oil entering the preheating tank 2, and additionally, the weakly oxidizing carbon dioxide after the raw oil and the carbon dioxide are contacted can mildly oxidize some impurities that are easy to be oxidized, and convert them into substances with stronger polarity and easier to be separated, and then the impurities can be removed by simple separation means such as distillation and extraction, so as to improve the purity of the raw oil and lay a foundation for producing high-quality carbon black.

[0029] It should be understood that the embodiments are only used for illustrating the present application and not for limiting the scope of the present application. In addition, it should be understood that after reading the content taught by the present application, those skilled in the art can make various modifications or modifications to the present application, and these equivalent forms also fall within the scope defined by the claims of the present application.

Claims

1. A tail gas treatment and utilization apparatus for carbon black production, comprising a reaction furnace, characterized by: The upper inlet of the reaction furnace is communicated with a preheating tank through a pipeline, the inlet of the preheating tank is communicated with a raw oil tank through a pipeline, the upper outlet of the reaction furnace is communicated with a tail gas tank through a pipeline, the outlet of the tail gas tank is communicated to the inner jacket inlet of the preheating tank through a pipeline, the outlet of the inner jacket is communicated to a pressure swing adsorber through a pipeline, the outlet of the pressure swing adsorber is communicated with a nitrogen tank, and the outlet of the nitrogen tank is communicated to the lower discharge pipeline of the reaction furnace.

2. The apparatus according to claim 1, wherein: the carbon black production exhaust gas treatment and utilization apparatus is characterized by comprising: a carbon black production exhaust gas treatment and utilization apparatus according to any one of claims 1 to 2. A static mixer is arranged on the lower discharge pipeline of the reaction furnace, the outlet of the nitrogen tank is communicated to the inlet of the static mixer through a pipeline, and the outlet of the static mixer is communicated with a carbon black product tank through a pipeline.

3. The apparatus according to claim 1, wherein: the carbon black production exhaust gas treatment and utilization apparatus is characterized by comprising: a carbon black production exhaust gas treatment and utilization apparatus according to any one of claims 1 to 2. The upper outlet of the pressure swing adsorber is communicated with a burner through a pipeline, the outlet of the burner is communicated with a first dryer through a pipeline, and the outlet of the first dryer is communicated to the upper inlet of the outer jacket of the preheating tank through a pipeline.

4. The tail gas treatment and utilization device for carbon black production as described in claim 3, characterized in that: The lower outlet of the outer jacket is communicated with a second dryer through a pipeline, and the outlet of the second dryer is communicated with a carbon dioxide tank through a pipeline.

5. The tail gas treatment and utilization device for carbon black production as described in claim 4, characterized in that: The outlet of the carbon dioxide tank is communicated to the reaction furnace through a pipeline.

6. The apparatus according to claim 3, wherein: the carbon black production exhaust gas treatment and utilization apparatus is characterized by comprising: a carbon black production exhaust gas treatment and utilization apparatus according to any one of claims 1 to 5. The outlet of the raw oil tank is communicated to the lower inlet of the outer jacket through a pipeline, and the upper outlet of the outer jacket is communicated to the inlet of the preheating tank through a pipeline.

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