CN111909710A - Carbon black tail gas treatment method - Google Patents

Carbon black tail gas treatment method Download PDF

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Publication number
CN111909710A
CN111909710A CN202010782546.2A CN202010782546A CN111909710A CN 111909710 A CN111909710 A CN 111909710A CN 202010782546 A CN202010782546 A CN 202010782546A CN 111909710 A CN111909710 A CN 111909710A
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carbon black
tail gas
black tail
treatment
tower
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Inventor
崔庆渊
汤燕波
施月婷
严志
吴齐荣
范菊娥
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Yunnan Yunwei Feihu Chemical Co ltd
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Yunnan Yunwei Feihu Chemical Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B21/00—Heating of coke ovens with combustible gases
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/002—Removal of contaminants
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors

Abstract

The invention discloses a carbon black tail gas treatment method, which comprises the following steps: (1) carrying out shunting treatment on the carbon black tail gas to obtain carbon black tail gas I and carbon black tail gas II after shunting; (2) sending the carbon black tail gas I into an absorption tower for desulfurization treatment to obtain desulfurized carbon black tail gas; (3) mixing the desulfurized carbon black tail gas and the carbon black tail gas II in parallel to obtain mixed carbon black tail gas, pressurizing, and then conveying to a dehydration tower for dehydration treatment to obtain dehydrated carbon black tail gas; (4) the obtained dehydrated carbon black tail gas is pressurized and then sent to a coke oven device to be used as coke oven fuel. The carbon black tail gas treatment method can slow down or eliminate the corrosion problem of equipment and pipelines in the carbon black tail gas treatment process while improving the heat value of the carbon black tail gas, reduce the safety risk in the carbon black tail gas treatment process and reduce the carbon black tail gas treatment cost.

Description

Carbon black tail gas treatment method
Technical Field
The invention relates to the technical field of carbon black tail gas treatment, in particular to a carbon black tail gas treatment method.
Background
The carbon black tail gas is low-heating value harmful gas containing combustible components and discharged in the carbon black production process. One ton of carbon black can be produced to generate about 3000-4000 Nm3 carbon black tail gas. The carbon black tail gas comprises CO and H2、CH4、CO2、H2S and SO2And the like. The carbon black is used as a high energy consumption industry, the energy cost in the production cost accounts for more than 90%, wherein the chemical heat contained in the carbon black tail gas accounts for 51.1% of the total input energy of the carbon black production. Therefore, the comprehensive utilization of the carbon black tail gas is very important for reducing the production cost, improving the benefit and protecting the environment.
At present, the following two approaches are mainly used for treating carbon black tail gas in China. (1) The waste gas is directly discharged from high altitude through the incinerator after incineration, and the method basically meets the environmental protection requirement, but does not effectively utilize a heat source, and has poor economy. (2) Through boiler combustion, the produced steam is used for production and life or drives a steam turbine generator set to generate electricity, the economy is better, but the water content of the high-humidity carbon black tail gas is about 38% -41%, the combustion temperature is low, the tail gas is not completely combusted, the heat utilization efficiency is low, and the corrosion of equipment and pipelines is serious.
In order to solve the problems, the invention patent of China, entitled publication No. CN103007696B, discloses a method for treating carbon black tail gas, which comprises the steps of dehydrating the carbon black tail gas, increasing the heat value of the carbon black tail gas, replacing the return gas of a coke oven with the dehydrated carbon black tail gas, and returning the replaced high heat value to the outside of the oven gas for supplying to cities, thereby achieving the effective and cyclic utilization of resources.
However, in this treatment method, the carbon black tail gas itself contains CO and H2、CH4H is contained in addition to the combustible gas2S、SO2And toxic and harmful components such as HCN. Directly dehydrating the carbon black tail gas containing the components, and then replacing the treatment mode of the return gas of the coke oven,on the one hand H in the tail gas2S、SO2The presence of isosulfides and HCN causes corrosion problems in the equipment and pipelines, while H2S、SO2And due to the existence of toxic and harmful components such as HCN (hydrogen cyanide) and the like, the whole carbon black tail gas treatment process has great potential safety hazard and great safety risk.
In the prior art, in order to solve the problem of corrosion of equipment and pipelines and eliminate potential safety hazards, carbon black tail gas is usually subjected to desulfurization treatment. However, the operation mode has the disadvantages of large load of the desulfurization process, large consumption of the desulfurizer and high operation cost, and greatly increases the treatment cost of enterprises, so the practicability is poor.
Therefore, how to design a carbon black tail gas treatment method, the heat value of the carbon black tail gas treatment method is improved, the corrosion problem of equipment and pipelines in the carbon black tail gas treatment process can be relieved or eliminated, the safety risk in the carbon black tail gas treatment process is reduced, the carbon black tail gas treatment cost is reduced, and the method has very important practical significance.
Disclosure of Invention
The invention aims to provide a carbon black tail gas treatment method, which can slow down or eliminate the corrosion problem of equipment and pipelines in the carbon black tail gas treatment process while improving the heat value of the carbon black tail gas, reduce the safety risk in the carbon black tail gas treatment process and reduce the carbon black tail gas treatment cost.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a carbon black tail gas treatment method comprises the following steps:
(1) carrying out shunting treatment on the carbon black tail gas to obtain carbon black tail gas I and carbon black tail gas II after shunting;
(2) sending the carbon black tail gas I into an absorption tower for desulfurization treatment to obtain desulfurized carbon black tail gas;
(3) mixing the desulfurized carbon black tail gas and the carbon black tail gas II in parallel to obtain mixed carbon black tail gas, pressurizing, and then conveying to a dehydration tower for dehydration treatment to obtain dehydrated carbon black tail gas;
(4) the obtained dehydrated carbon black tail gas is pressurized and then sent to a coke oven device to be used as coke oven fuel.
Preferably, the carbon black tail gas in the step (1) is subjected to split-flow treatment through a tee joint.
Preferably, the carbon black tail gas I in the step (2) is further subjected to a washing step of a washing tower before being sent to an absorption tower for desulfurization treatment.
Preferably, the volume ratio of the carbon black tail gas I to the carbon black tail gas II in the step (1) is 2-5: 1.
The invention has the beneficial effects that:
(1) the carbon black tail gas is subjected to shunting treatment to respectively obtain the carbon black tail gas I and the carbon black tail gas II, and the design aims to perform desulfurization treatment on only the part I of the carbon black tail gas obtained after shunting without performing desulfurization treatment on all the carbon black tail gas, so that the load of a desulfurization treatment process can be reduced, and the cost of the desulfurization treatment process is reduced.
(2) Carrying out parallel mixing on the desulfurized carbon black tail gas obtained after desulfurization treatment and the carbon black tail gas II obtained by shunting to obtain mixed carbon black tail gas, wherein the mixed carbon black tail gas contains H and the carbon black tail gas before shunting2S、SO2And the HCN component concentration is reduced, so that the corrosion problem to equipment and pipelines can be reduced or eliminated in the dehydration treatment process of the dehydration tower.
(3) The desulfurization procedure is to remove most of H in the carbon black tail gas I2S、SO2HCN is absorbed and purified, and H is reduced by mixing the desulfurized carbon black tail gas with the carbon black tail gas II in parallel2S、SO2And the concentration of the HCN component, thereby reducing the safety risk of the toxic components in the carbon black tail gas treatment process.
(4) On the basis of the equipment foundation and the mature process foundation of the traditional carbon black production and processing enterprise, excessive infrastructure and production procedures do not need to be additionally added, the dehydration process technology and the desulfurization process technology utilize the prior art, and the invention only needs to add a shunting device (a three-way joint) and carry out a pipe-in-pipe mixing procedure on the desulfurization carbon black tail gas and the carbon black tail gas II obtained by shunting, thereby greatly reducing the production procedure transformation cost of the existing carbon black production and processing enterprise.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The following examples further illustrate embodiments of the present invention. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
A carbon black tail gas treatment method comprises the following steps:
(1) carbon black tail gas from a carbon black production line is collected to a carbon black tail gas main pipe through a merging pipe, and the tail end of the carbon black tail gas main pipe is connected with a three-way joint, so that the carbon black tail gas is subjected to shunting treatment through the three-way joint, and carbon black tail gas I and carbon black tail gas II are obtained after shunting; in the carbon black tail gas shunting process, the shunting flow is controlled by a flow control valve, so that the volume ratio of the carbon black tail gas I to the carbon black tail gas II is 1: 1;
(2) sending the carbon black tail gas I into an absorption tower for desulfurization treatment, specifically, the absorption desulfurization treatment process of the carbon black tail gas I in the absorption tower is as follows: the carbon black tail gas I enters from the lower part of the absorption tower and is in countercurrent contact with absorption liquid sprayed on the top of the absorption tower, and the carbon black tail gas after purification treatment is discharged from the upper end of the absorption tower to obtain desulfurized carbon black tail gas; specifically, the flow ratio of the absorption liquid to the carbon black tail gas I is 12L/m3, and the operating temperature in the absorption tower is 52 ℃; specifically, the absorption liquid in this example is a sodium carbonate or potassium carbonate aqueous solution, and the pH of the absorption liquid is adjusted by NaOH, and the pH thereof is 8.5.
(3) Mixing the desulfurized carbon black tail gas and the carbon black tail gas II in parallel to obtain mixed carbon black tail gas, pressurizing, and then conveying to a dehydration tower for dehydration treatment to obtain dehydrated carbon black tail gas; specifically, when the mixed carbon black tail gas is subjected to dehydration treatment in a dehydration tower, the mixed carbon black tail gas enters from the lower part of the dehydration tower and is in countercurrent contact with circulating cooling water at the top of a water tower to carry out mass and heat transfer
(4) The obtained dehydrated carbon black tail gas is pressurized and then directly sent to a coke oven device to be used as coke oven fuel.
Carbon black tail gas I in this example: h2The S concentration was 310mg/Nm3、SO2The concentration is 1600mg/Nm3HCN concentration of 340mg/Nm3(ii) a After desulfurization treatment in the absorption tower, the obtained desulfurization carbon black tail gas is as follows: h2The S concentration was 5.5mg/Nm3、SO2The concentration is 20mg/Nm3HCN concentration of 16mg/Nm3(ii) a And (3) carrying out parallel-tube mixing on the desulfurization carbon black tail gas and the carbon black tail gas II, and dehydrating the obtained mixed carbon black tail gas to obtain dehydrated carbon black tail gas: h2The S concentration was 154.5mg/Nm3、SO2The concentration is 798mg/Nm3HCN concentration of 182mg/Nm3。
From the above data, it can be seen that H contained in the dehydrated carbon black tail gas2S、SO2Compared with the original carbon black tail gas removal rate, the removal rate of the HCN is respectively 50.16%, 50.13% and 46.47%.
Example 2
A carbon black tail gas treatment method comprises the following steps:
(1) carbon black tail gas from a carbon black production line is collected to a carbon black tail gas main pipe through a merging pipe, the carbon black tail gas main pipe is respectively connected with a carbon black tail gas I pipe and a carbon black tail gas II pipe, and the carbon black tail gas I pipe and the carbon black tail gas II pipe are respectively provided with a flow control valve; shunting the carbon black tail gas through a carbon black tail gas I pipe, a carbon black tail gas II pipe and a flow control valve to obtain carbon black tail gas I and carbon black tail gas II; the volume ratio of the carbon black tail gas I to the carbon black tail gas II is 3: 1;
(2) send carbon black tail gas I to the absorption tower in after washing by the scrubbing tower and carry out desulfurization treatment, specifically, the absorption desulfurization treatment process of carbon black tail gas I in the absorption tower is: the carbon black tail gas I enters from the lower part of the absorption tower, is in countercurrent contact with absorption liquid sprayed from the top of the absorption tower, and is purifiedDischarging the carbon black tail gas through the upper end of the absorption tower to obtain desulfurized carbon black tail gas; specifically, the ratio of the flow rate of the absorption liquid to the flow rate of the carbon black tail gas I is 16L/m3The operating temperature in the absorption tower is 55 ℃; specifically, the absorption liquid is prepared by dissolving ferric salt and disodium ethylene diamine tetraacetate in water, and Fe in the absorption liquid3+The mol ratio of the Fe to the ethylene diamine tetraacetic acid is 1:1, and the Fe in the absorption liquid3+The concentration is 0.028mol/L, and the absorption liquid passes through Na2CO3And NaOH to adjust the pH, which was 8.0.
(3) Mixing the desulfurized carbon black tail gas and the carbon black tail gas II in parallel to obtain mixed carbon black tail gas, pressurizing, and then conveying to a dehydration tower for dehydration treatment to obtain dehydrated carbon black tail gas; specifically, when the mixed carbon black tail gas is subjected to dehydration treatment in a dehydration tower, the mixed carbon black tail gas enters from the lower part of the dehydration tower and is in countercurrent contact with circulating cooling water at the top of a water tower to carry out mass and heat transfer
(4) The obtained dehydrated carbon black tail gas is pressurized and then directly sent to a coke oven device to be used as coke oven fuel.
Carbon black tail gas I in this example: h2The S concentration is 280mg/Nm3、SO2The concentration was 1796mg/Nm3HCN concentration of 360mg/Nm3(ii) a After desulfurization treatment in the absorption tower, the obtained desulfurization carbon black tail gas is as follows: h2The S concentration was 3.4mg/Nm3、SO2The concentration is 22mg/Nm3HCN concentration of 10mg/Nm3(ii) a And (3) carrying out tube-in-tube mixing on the desulfurization carbon black tail gas and the carbon black tail gas II, and dehydrating the carbon black tail gas after dehydration treatment of the obtained mixed carbon black tail gas: h2The S concentration was 72.05mg/Nm3、SO2The concentration was 465.58mg/Nm3HCN concentration of 97.5mg/Nm3。
From the above data, it can be seen that H contained in the dehydrated carbon black tail gas2S、SO2Compared with the original carbon black tail gas removal rate, the removal rate of the HCN is 74.27%, 74.08% and 72.92%.
Example 3
A carbon black tail gas treatment method comprises the following steps:
(1) shunting the carbon black tail gas through a three-way joint to obtain carbon black tail gas I and carbon black tail gas II; the volume ratio of the carbon black tail gas I to the carbon black tail gas II is 4: 1;
(2) send carbon black tail gas I to the absorption tower in after washing by the scrubbing tower and carry out desulfurization treatment, specifically, the absorption desulfurization treatment process of carbon black tail gas I in the absorption tower is: the carbon black tail gas I enters from the lower part of the absorption tower and is in countercurrent contact with absorption liquid sprayed on the top of the absorption tower, and the carbon black tail gas after purification treatment is discharged from the upper end of the absorption tower to obtain desulfurized carbon black tail gas; specifically, the ratio of the flow rate of the absorption liquid to the flow rate of the carbon black tail gas I is 12L/m3The operating temperature in the absorption tower is 55 ℃; specifically, the absorption liquid is prepared by dissolving ferric salt and disodium ethylene diamine tetraacetate in water, and Fe in the absorption liquid3+The mol ratio of the Fe to the ethylene diamine tetraacetic acid is 1:1, and the Fe in the absorption liquid3+The concentration is 0.028mol/L, and the absorption liquid passes through Na2CO3And NaOH to adjust the pH, which was 8.0.
(3) Mixing the desulfurized carbon black tail gas and the carbon black tail gas II in parallel to obtain mixed carbon black tail gas, pressurizing, and then conveying to a dehydration tower for dehydration treatment to obtain dehydrated carbon black tail gas; specifically, when the mixed carbon black tail gas is subjected to dehydration treatment in a dehydration tower, the mixed carbon black tail gas enters from the lower part of the dehydration tower and is in countercurrent contact with circulating cooling water at the top of a water tower to carry out mass and heat transfer
(4) The obtained dehydrated carbon black tail gas is pressurized and then directly sent to a coke oven device to be used as coke oven fuel.
Carbon black tail gas I in this example: h2The S concentration was 330mg/Nm3、SO2The concentration was 1225mg/Nm3HCN concentration of 310mg/Nm3(ii) a After desulfurization treatment in the absorption tower, the obtained desulfurization carbon black tail gas is as follows: h2The S concentration was 4.6mg/Nm3、SO2The concentration is 8mg/Nm3HCN concentration of 7.6mg/Nm3(ii) a And (3) carrying out parallel-tube mixing on the desulfurization carbon black tail gas and the carbon black tail gas II, and dehydrating the obtained mixed carbon black tail gas to obtain dehydrated carbon black tail gas: h2The S concentration was 70.11mg/Nm3、SO2Has a concentration of 248.36mgNm3HCN concentration of 65.35mg/Nm3。
From the above data, it can be seen that H contained in the dehydrated carbon black tail gas2S、SO2And compared with the original carbon black tail gas removal rate, the removal rate of the HCN is respectively 78.75%, 79.73% and 78.92%.
Example 4
A carbon black tail gas treatment method comprises the following steps:
(1) shunting the carbon black tail gas through a three-way joint to obtain carbon black tail gas I and carbon black tail gas II; the volume ratio of the carbon black tail gas I to the carbon black tail gas II is 5: 1;
(2) send carbon black tail gas I to the absorption tower in after washing by the scrubbing tower and carry out desulfurization treatment, specifically, the absorption desulfurization treatment process of carbon black tail gas I in the absorption tower is: the carbon black tail gas I enters from the lower part of the absorption tower and is in countercurrent contact with absorption liquid sprayed on the top of the absorption tower, and the carbon black tail gas after purification treatment is discharged from the upper end of the absorption tower to obtain desulfurized carbon black tail gas; specifically, the ratio of the flow rate of the absorption liquid to the flow rate of the carbon black tail gas I is 15L/m3The operating temperature in the absorption tower is 50 ℃; specifically, the absorption liquid is prepared by dissolving ferric salt and disodium ethylene diamine tetraacetate in water, and Fe in the absorption liquid3+The mol ratio of the Fe to the ethylene diamine tetraacetic acid is 1:1, and the Fe in the absorption liquid3+The concentration is 0.028mol/L, and the absorption liquid passes through Na2CO3And NaOH to adjust the pH, which was 7.5.
(3) Mixing the desulfurized carbon black tail gas and the carbon black tail gas II in parallel to obtain mixed carbon black tail gas, pressurizing, and then conveying to a dehydration tower for dehydration treatment to obtain dehydrated carbon black tail gas; specifically, when the mixed carbon black tail gas is subjected to dehydration treatment in a dehydration tower, the mixed carbon black tail gas enters from the lower part of the dehydration tower and is in countercurrent contact with circulating cooling water at the top of a water tower to carry out mass and heat transfer
(4) The obtained dehydrated carbon black tail gas is pressurized and then directly sent to a coke oven device to be used as coke oven fuel.
Carbon black tail gas I in this example: h2The S concentration is 288mg/Nm3、SO2The concentration is 1460mg/Nm3HCN concentration of 326mg/Nm3(ii) a After desulfurization treatment in the absorption tower, the obtained desulfurization carbon black tail gas is as follows: h2The S concentration was 3.8mg/Nm3、SO2The concentration was 6.5mg/Nm3HCN concentration of 4.3mg/Nm3(ii) a And (3) carrying out parallel-tube mixing on the desulfurization carbon black tail gas and the carbon black tail gas II, and dehydrating the obtained mixed carbon black tail gas to obtain dehydrated carbon black tail gas: h2The S concentration was 51.05mg/Nm3、SO2The concentration was 248.37mg/Nm3HCN concentration of 56.28mg/Nm3。
From the above data, it can be seen that H contained in the dehydrated carbon black tail gas2S、SO2Compared with the original carbon black tail gas removal rate, the removal rate of the HCN is 82.27%, 82.99% and 82.74%.
The embodiments of the present invention have been described in detail with reference to the examples, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.

Claims (4)

1. A carbon black tail gas treatment method is characterized by comprising the following steps:
(1) carrying out shunting treatment on the carbon black tail gas to obtain carbon black tail gas I and carbon black tail gas II after shunting;
(2) sending the carbon black tail gas I into an absorption tower for desulfurization treatment to obtain desulfurized carbon black tail gas;
(3) mixing the desulfurized carbon black tail gas and the carbon black tail gas II in parallel to obtain mixed carbon black tail gas, pressurizing, and then conveying to a dehydration tower for dehydration treatment to obtain dehydrated carbon black tail gas;
(4) the obtained dehydrated carbon black tail gas is pressurized and then sent to a coke oven device to be used as coke oven fuel.
2. The carbon black tail gas treatment method according to claim 1, wherein the carbon black tail gas in the step (1) is subjected to split-flow treatment through a tee joint.
3. The method for treating carbon black tail gas as claimed in claim 1 or 2, wherein the carbon black tail gas I in the step (2) is further subjected to a washing step of a washing tower before being sent to an absorption tower for desulfurization treatment.
4. The carbon black tail gas treatment method according to claim 3, wherein the volume ratio of the carbon black tail gas I to the carbon black tail gas II in the step (1) is 2-5: 1.
CN202010782546.2A 2020-08-06 2020-08-06 Carbon black tail gas treatment method Pending CN111909710A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202270473U (en) * 2011-10-10 2012-06-13 杭州三和环保技术工程有限公司 Carbon black tail gas desulfurization device
CN102836621A (en) * 2012-09-28 2012-12-26 浙江商达环保有限公司 Flue gas desulfurizing agent and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202270473U (en) * 2011-10-10 2012-06-13 杭州三和环保技术工程有限公司 Carbon black tail gas desulfurization device
CN102836621A (en) * 2012-09-28 2012-12-26 浙江商达环保有限公司 Flue gas desulfurizing agent and preparation method thereof

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Application publication date: 20201110