CN109847546B - Environment-friendly zero-emission tail gas treatment process - Google Patents
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Abstract
The invention relates to a coal chemical industry tail gas treatment method, and provides an environment-friendly zero-emission tail gas treatment process, which at least comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process comprises the steps of collecting tail gas in a coking chemical system in a closed manner, pretreating and washing, conveying by a fan, pressurizing by a coke oven, then conveying into a waste gas tray and a regenerator, blowing a chute into a combustion chamber for burning, and desulfurizing and denitrifying.
Description
Technical Field
The invention relates to a coal chemical industry tail gas treatment method, in particular to an environment-friendly zero-emission tail gas treatment process.
Background
With the continuous improvement of the industrialization degree, the pollution of the VOCs tends to be further expanded. Volatile organic compounds include not only large amounts of methanol and dimethyl ether but also large amounts of olefins such as ethylene, propylene, butene, pentene, and the like, and in addition, aromatic hydrocarbons such as benzene, toluene, xylene, naphthalene, anthracene, quinone, and other monocyclic or polycyclic or fused aromatic hydrocarbons, and alkanes of C5 and below, and the like. With the recent stricter environmental protection policy, the emission control of organic pollutant waste gas is more important, inhalable particles and ozone are the most important pollutants affecting the air quality in many places, and VOCs are used as precursors of the inhalable particles and the ozone, so that the VOCs are imperative to the treatment of the pollutants. The existing method is basically applied to treatment by technologies such as absorption method, adsorption method, incineration method, catalytic oxidation method and the like. However, as is well known, for VOCs with higher emission concentration, the absorption method is difficult to directly reach the standard for emission, and is generally applied as a pretreatment technology; the adsorption method generates hazardous waste to cause secondary pollution, and the concentration of VOCs treated by the adsorption method is difficult to reach the standard and cannot be directly discharged. For tail gas in different production areas, corresponding methods and devices such as a condensation cooling method, an absorption method, an activated carbon adsorption method, a nitrogen sealing method and the like are adopted, so that the investment is large, and the field peculiar smell cannot be eliminated fundamentally. The combustion purification method has the disadvantages of low concentration of combustible substances in the tail gas, low heat value, uncontrollable air quantity or tail gas pressure, easy occurrence of flash explosion accidents and high danger. The combustion method is most thoroughly treated, the main products of combustion are water and carbon dioxide, the pollution degree to air is low, but the safety of the existing equipment is very low, and the popularization and the use of the combustion method are hindered. At present, most washing methods, namely acid washing, alkali washing, oil washing and the like, are selected for treating the VOCs in the chemical waste gas of the coking plant, and the method has the disadvantages of large construction investment and 304 or 316L requirement on most equipment materials; the power consumption and the cost of production raw materials are high; the waste liquid generated after washing is difficult to treat; the most important is that the concentration of the exhaust gas discharged from the discharge port reaches the currently executed emission standard of the pollutants in the coking chemical industry after the exhaust gas components are washed by a complex and single washing method, and the exhaust gas treatment technology is required to be technically innovated when the environmental protection standard is upgraded; so as to achieve complete standard or zero emission.
Disclosure of Invention
In order to solve the above technical problems, a first aspect of the present invention provides an environment-friendly zero-emission tail gas treatment process, which at least comprises the following steps: a negative pressure recovery process and a combustion process;
the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process comprises the steps of collecting tail gas in a coking chemical system in a closed manner, pretreating and washing, conveying by a fan, pressurizing by a coke oven, then conveying into a waste gas tray and a regenerator, blowing a chute into a combustion chamber for burning, and desulfurizing and denitrifying.
As a preferable technical scheme, the combustion process further comprises the steps of hermetically collecting tail gas in a coking chemical system, pretreating and washing the tail gas, feeding the tail gas into a boiler air distribution system for combustion, and performing desulfurization and denitrification treatment.
As a preferred technical scheme, when the oxygen content of tail gas in the coking chemical system is less than 1 v%, a negative pressure recovery process is adopted for tail gas treatment; and when the oxygen content of the tail gas in the coking chemical system is more than or equal to 1 v%, the tail gas is treated by adopting a combustion process.
As a preferable technical scheme, the negative pressure of the negative pressure recovery process is-2000 to-1000 Pa; the negative pressure recovery process is controlled by a DCS automatic control system; the negative pressure recovery process is protected by a nitrogen sealing system.
As a preferred embodiment, the pretreatment washing in the present invention includes at least one of acid washing, alkali washing, and water washing.
As a preferable technical scheme, the pickling is at least one of a sulfuric acid aqueous solution, a nitric acid aqueous solution and a hydrofluoric acid aqueous solution, and the pickling temperature is 30-50 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 30-50 ℃; the water washing temperature is 40-70 ℃.
As a preferable technical scheme, the concentration of the sulfuric acid aqueous solution is 3-10 wt%; the concentration of the sodium hydroxide aqueous solution is 10-20 wt%.
In a preferable technical scheme, the pressure for pressurizing the coke oven is 1.0-1.5 KPa.
As a preferred technical scheme, the concentration of VOCs after combustion in the combustion process is less than 30mg/Nm3。
As a preferred technical scheme, the air volume of the fan in the fan conveying process is 8000-15000 cubic meters per hour; the diameter of the inner wall of the pipeline is 300-500 mm.
The foregoing and other features, aspects, and advantages of the present application will become more readily apparent with reference to the following detailed description.
Detailed Description
Unless otherwise indicated, implied from the context, or customary in the art, all parts and percentages herein are by weight and the testing and characterization methods used are synchronized with the filing date of the present application. To the extent that a definition of a particular term disclosed in the prior art is inconsistent with any definitions provided herein, the definition of the term provided herein controls.
The technical features of the technical solutions provided by the present invention are further clearly and completely described below with reference to the specific embodiments, and the scope of protection is not limited thereto.
The words "preferred", "preferably", "more preferred", and the like, in the present invention, refer to embodiments of the invention that may provide certain benefits, under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention. The sources of components not mentioned in the present invention are all commercially available.
The invention provides an environment-friendly zero-emission tail gas treatment process, which at least comprises the following steps: a negative pressure recovery process and a combustion process;
the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process comprises the steps of collecting tail gas in a coking chemical system in a closed manner, pretreating and washing, conveying by a fan, pressurizing by a coke oven, then conveying into a waste gas tray and a regenerator, blowing a chute into a combustion chamber for burning, and desulfurizing and denitrifying.
The invention relates to an environment-friendly zero-emission tail gas treatment process.
In some embodiments, the step of the combustion process further comprises the steps of hermetically collecting tail gas in a coking chemical system, pretreating and washing the tail gas, feeding the tail gas into a boiler air distribution system for combustion, and performing desulfurization and denitrification treatment.
In some embodiments, the air volume in the boiler air distribution system is 6000-12000 cubic meters/hour; preferably, the air volume in the air distribution system of the boiler is 7000-11000 cubic meters per hour; more preferably, the air volume in the air distribution system of the boiler is 8000-10000 cubic meters/hour; most preferably, the air volume in the air distribution system of the boiler is 9000 cubic meters per hour.
In some embodiments, the tail gas treatment is performed by a negative pressure recovery process when the oxygen content of the tail gas in the coking chemical system is less than 1 v%; and when the oxygen content of the tail gas in the coking chemical system is more than or equal to 1 v%, the tail gas is treated by adopting a combustion process.
The v% refers to volume fraction.
According to the invention, a proper tail gas treatment process is selected according to the oxygen content of the tail gas in the coking chemical system, and if the oxygen content is higher, a combustion process can be selected to treat the tail gas, so that not only can the safety be improved, but also the combustibility can be improved, and the thorough combustion is promoted; if the oxygen content of the tail gas is lower, a negative pressure recovery process can be selected to treat the tail gas, so that the safety can be improved, the tail gas is prevented from being discharged disorderly, the operation cost is low, the process is simple, secondary pollution is avoided, the waste is changed into valuable materials by recovering benzene, ammonia and the like in the tail gas through negative pressure, the field environment is improved, and the total energy consumption of the system is correspondingly reduced.
In some embodiments, the negative pressure recovery process has a negative pressure magnitude of-2000 to-1000 Pa; preferably, the negative pressure of the negative pressure recovery process is-1500 to-1100 Pa; more preferably, the negative pressure of the negative pressure recovery process is-1200 Pa.
In some embodiments, the negative pressure recovery process is controlled by a DCS autonomous system.
The DCS automatic control system is used for automatically identifying the operation condition of each storage tank and opening or closing the tail gas main valve and the tail gas regulating valves of each tank so as to realize the pressure stability of the branch pipes and the main pipe of each tank. When the pressure in the tank is lower than or higher than the pressure of the tail gas main pipe, the DCS automatic control system automatically identifies the working condition of the tail gas system, and the nitrogen device is closed to balance the pressure by the tail gas main pipe regulating valve. Meanwhile, the pressure alarm limit value of each groove is set to exceed the normal control range, and the alarm prompts post personnel to find out the treatment problem in time.
In some embodiments, the negative pressure recovery process is protected by a nitrogen seal system.
The nitrogen sealing system is used for conveying nitrogen produced by the nitrogen making device to each storage tank of the negative pressure recovery system to perform safety protection and sealing on the storage tanks so as to reduce volatilization of products such as tar, benzene and the like and reduce product loss.
In some embodiments, a breather valve is provided in the negative pressure recovery process.
In some embodiments, the breather valve is disposed on each reservoir; the specific position of the breather valve on the reservoir is set according to a manner well known to those skilled in the art and is not particularly limited.
The breather valve is used for ensuring that the pressure of the storage tank is not too high or too low under the fault states of a power-off and DCS automatic control system, and ensuring the safety of the tank body.
In some embodiments, a flame arrestor is provided in the negative pressure recovery process.
In some embodiments, the flame arrestor is disposed on each storage tank; the specific location of the flame arrestor on the storage tank is provided in a manner well known to those skilled in the art and is not particularly limited.
The fire arrestor is for according to chemical industry safety standard, and dangerous chemical storage tank need set up the fire arrestor, meets under the naked light condition again, controls minimum safe risk.
In some embodiments, the VOC pipeline needs to be subjected to steam tracing in the negative pressure recovery process, so that it can be ensured that crystals generated in the VOC pipeline are reduced under the condition of too low room temperature, and normal circulation of gas and normal discharge of condensate are ensured.
The method of steam tracing VOC pipes is well known to those skilled in the art and is not particularly limited.
In some embodiments, the negative pressure recovery process requires periodic steam purging of the VOC lines; the VOC pipeline is periodically subjected to steam purging, so that purging is performed after long-time operation, and the effects of cleanness in the pipeline and normal resistance are achieved.
The method of providing a periodic steam purge to the VOC line is well known to those skilled in the art and is not particularly limited.
In some embodiments, the negative pressure recovery process is provided with an online oxygen analyzer; the online oxygen analyzer is used for monitoring the oxygen content in real time, so that the operation safety of the system is ensured, and high-limit alarm and interlocking are realized.
The specific position of the on-line oxygen analyzer is set according to a mode well known by the technical personnel in the field, and is not specially limited.
In some embodiments, the negative pressure recovery process includes two modes of operation; the two operating modes are monotonous and fuzzy control.
One of the operation modes of the negative pressure recovery process can be selected by the person skilled in the art according to the actual situation.
The invention provides an environment-friendly zero-emission tail gas treatment process, which mainly aims at carrying out post-treatment on waste gas and tail gas generated by a coking plant, adopts different treatment means according to the oxygen content in the tail gas, has wide application range for treating the tail gas, is simple, economic and reasonable, safe, reliable and easy to control, has good removal effect on volatile organic gas, can not release any harmful gas, can not generate any pollution to the air, finally realizes zero emission of the tail gas, and accords with the regulation of coking chemical industry pollutant emission standard GB 16171-2012. According to the invention, different tail gas treatment processes are selected according to the oxygen content in the closely collected tail gas, so that the safety of the whole process can be ensured, when the oxygen content is lower, the negative pressure recovery zero-emission system is adopted to recover the tail gas to recycle the coal gas, and the resource utilization of energy is realized.
In some embodiments, the pre-treatment wash comprises at least one of an acid wash, a base wash, a water wash; preferably, the pretreatment washing comprises acid washing, alkali washing and water washing; more preferably, the order of the acid washing, the alkali washing, and the water washing is maintained constant.
In some embodiments, the acid cleaning is at least one of a sulfuric acid aqueous solution, a nitric acid aqueous solution and a hydrofluoric acid aqueous solution, and the acid cleaning temperature is 30-50 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 30-50 ℃; the water washing temperature is 40-70 ℃.
In some preferred embodiments, the acid wash is at least one of an aqueous sulfuric acid solution, an aqueous nitric acid solution, and the acid wash temperature is 40 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 40 ℃; the washing temperature was 55 ℃.
In some more preferred embodiments, the acid wash is an aqueous sulfuric acid solution, the acid wash temperature is 40 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 40 ℃; the washing temperature was 55 ℃.
In some embodiments, the concentration of the aqueous sulfuric acid solution is 3 to 10 wt%; the concentration of the sodium hydroxide aqueous solution is 10-20 wt%; preferably, the concentration of the sulfuric acid aqueous solution is 5-8 wt%; the concentration of the sodium hydroxide aqueous solution is 13-18 wt%; more preferably, the concentration of the aqueous sulfuric acid solution is 6.5 wt%; the concentration of the aqueous sodium hydroxide solution was 16 wt%.
In some embodiments, the coke oven pressurization pressure is from 1.0 to 1.5 KPa; preferably, the pressure for pressurizing the coke oven is 1.2-1.4 KPa; more preferably, the coke oven pressurization pressure is 1.3 KPa.
In some embodiments, the concentration of VOCs after combustion in the combustion process is less than 30mg/Nm3(ii) a Preferably, the concentration of VOCs after combustion in the combustion process is less than 15mg/Nm3(ii) a More preferably, the concentration of VOCs after combustion in the combustion process is 10mg/Nm3。
The VOCs are volatile organic compounds and include not only a large amount of methanol and dimethyl ether, but also a large amount of olefins such as ethylene, propylene, butene, pentene, and the like, and in addition, aromatic hydrocarbons (such as benzene, toluene, xylene, naphthalene, anthracene, quinone, and other monocyclic or polycyclic or fused aromatic hydrocarbons) and alkanes of C5 and below, and the like.
The concentration of the VOCs is determined by gas chromatography-mass spectrometry.
In some embodiments, the air volume of the fan in the fan conveying process is 8000-; the diameter of the inner wall of the pipeline is 300-500 mm; preferably, the air volume of the fan in the fan conveying process is 9000-13000 cubic meters/hour; the diameter of the inner wall of the pipeline is 350-450 mm; more preferably, the air volume of the fan in the fan conveying process is 12000 cubic meters per hour; the diameter of the inner wall of the pipeline is 400 mm.
Hair brushThe environment-friendly zero-emission tail gas treatment process provided by the invention has the advantages that the tail gas is treated by adopting a combustion process when the oxygen content generated by some chemical processes is higher, the combustion process is combined with the steps of pretreatment washing and desulfurization and denitration processes, the risk of flash explosion caused by air quantity reduction can be controlled, the thorough combustion of waste gas can be realized, and the real zero emission of toxic and harmful gases is realized. The main possible reason is that the generated tail gas is directly and hermetically collected and is not released into the air, the collected tail gas adopts a specific pretreatment washing process, and acid washing, alkali washing and water washing with certain concentration are sequentially carried out at a specific temperature, so that naphthalene, ammonia gas, hydrogen sulfide and other substances in the tail gas can be effectively cleaned, the full combustion of the tail gas can be promoted, and the effect of reducing harmful tail gas is achieved. In addition, the pressure of the whole system can reach a relatively stable state by controlling certain air quantity and the mutual matching between the pipe channel and the coke oven pressure, and the combustion of the washed tail gas can reach an optimal state. In addition, the applicant unexpectedly finds that the small amount of volatile organic gas remained after the combustion treatment of the tail gas further affects the desulfurization and denitrification effects of the next step, SO as to affect the final SO2And NOxThe applicants have found that the concentration of VOCs after combustion is controlled to 30mg/Nm when the combustion process is operated3Within the range that substantially no SO will be detected after the final desulfurization and denitration2And NOx。
The present invention is described in detail by the following examples, which are provided for the purpose of further illustration only and are not to be construed as limitations of the present invention, and non-essential modifications and adaptations thereof by those skilled in the art according to the present invention will still fall within the scope of the present invention.
Example 1
An environment-friendly zero-emission tail gas treatment process comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process comprises the steps of collecting tail gas in a coking chemical system in a closed manner, pretreating and washing, conveying by a fan, pressurizing by a coke oven, then conveying into a waste gas tray and a regenerator, blowing a chute into a combustion chamber for burning, and performing desulfurization and denitration treatment;
the oxygen content of the tail gas in the coking chemical system is 1.55 v%, and a combustion process is selected for tail gas treatment;
the pretreatment washing comprises acid washing, alkali washing and water washing, and the sequence is kept constant, wherein the acid washing comprises sulfuric acid aqueous solution, and the acid washing temperature is 40 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 40 ℃; the washing temperature is 55 ℃; the concentration of the sulfuric acid aqueous solution is 6.5 wt%; the concentration of the sodium hydroxide aqueous solution is 16 wt%; the pressure for pressurizing the coke oven is 1.3 KPa; the concentration of VOCs after combustion in the combustion process is 10mg/Nm3(ii) a The air volume of the fan in the fan conveying process is 12000 cubic meters per hour; the diameter of the inner wall of the pipeline is 400 mm;
SO obtained after tail gas in the coking chemical system is subjected to the treatment2And NOxThe concentration is respectively 5mg/m3、14mg/m3。
Example 2
An environment-friendly zero-emission tail gas treatment process comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process comprises the steps of collecting tail gas in a coking chemical system in a closed manner, pretreating and washing, conveying by a fan, pressurizing by a coke oven, then conveying into a waste gas tray and a regenerator, blowing a chute into a combustion chamber for burning, and performing desulfurization and denitration treatment;
the oxygen content of the tail gas in the coking chemical system is 1.55 v%, and a combustion process is selected for tail gas treatment;
the pretreatment washing comprises acid washing, alkali washing and water washing, and the sequence is kept constant, wherein the acid washing comprises sulfuric acid aqueous solution, and the acid washing temperature is 30 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 30 ℃; the water washing temperature is 40 ℃; the concentration of the sulfuric acid aqueous solution is 3 wt%; the concentration of the sodium hydroxide aqueous solution is 10 wt%; the pressurizing pressure of the coke oven is 1.0 KPa; the fuelThe concentration of VOCs after combustion in the combustion process is 23mg/Nm3(ii) a The air volume of the fan in the fan conveying process is 8000 cubic meters per hour; the diameter of the inner wall of the pipeline is 300 mm;
SO obtained after tail gas in the coking chemical system is subjected to the treatment2And NOxThe concentration is 21mg/m respectively3、34mg/m3。
Example 3
An environment-friendly zero-emission tail gas treatment process comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process comprises the steps of collecting tail gas in a coking chemical system in a closed manner, pretreating and washing, conveying by a fan, pressurizing by a coke oven, then conveying into a waste gas tray and a regenerator, blowing a chute into a combustion chamber for burning, and performing desulfurization and denitration treatment;
the oxygen content of the tail gas in the coking chemical system is 1.55 v%, and a combustion process is selected for tail gas treatment;
the pretreatment washing comprises acid washing, alkali washing and water washing which are sequentially kept to be constant, wherein the acid washing comprises sulfuric acid aqueous solution, and the acid washing temperature is 50 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 50 ℃; the washing temperature is 70 ℃; the concentration of the sulfuric acid aqueous solution is 10 wt%; the concentration of VOCs after combustion in the combustion process is 30mg/Nm3(ii) a The concentration of the sodium hydroxide aqueous solution is 20 wt%; the pressure for pressurizing the coke oven is 1.5 KPa; the air volume of the fan in the fan conveying process is 15000 cubic meters per hour; the diameter of the inner wall of the pipeline is 500 mm;
SO obtained after tail gas in the coking chemical system is subjected to the treatment2And NOxThe concentration is 22mg/m respectively3、52mg/m3。
Example 4
An environment-friendly zero-emission tail gas treatment process comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process also comprises the steps of hermetically collecting tail gas in a coking chemical system, pretreating and washing the tail gas, feeding the tail gas into a boiler air distribution system for burning, and performing desulfurization and denitrification treatment;
the oxygen content of the tail gas in the coking chemical system is 1.55 v%, and a combustion process is selected for tail gas treatment;
the pretreatment washing comprises acid washing, alkali washing and water washing, which are sequentially kept to be constant, wherein the acid washing comprises nitric acid water solution, and the acid washing temperature is 40 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 40 ℃; the washing temperature is 55 ℃; the concentration of the sulfuric acid aqueous solution is 5 wt%; the concentration of the sodium hydroxide aqueous solution is 13 wt%; the pressure for pressurizing the coke oven is 1.2 KPa; the concentration of VOCs after combustion in the combustion process is 21mg/Nm3(ii) a The air volume in the boiler air distribution system is 7000 cubic meters per hour;
SO obtained after tail gas in the coking chemical system is subjected to the treatment2And NOxThe concentration is respectively 16mg/m3、29mg/m3。
Example 5
An environment-friendly zero-emission tail gas treatment process comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process also comprises the steps of hermetically collecting tail gas in a coking chemical system, pretreating and washing the tail gas, feeding the tail gas into a boiler air distribution system for burning, and performing desulfurization and denitrification treatment;
the oxygen content of the tail gas in the coking chemical system is 1.55 v%, and a combustion process is selected for tail gas treatment;
the pretreatment washing comprises acid washing, alkali washing and water washing, and the sequence is kept constant, wherein the acid washing comprises sulfuric acid aqueous solution, and the acid washing temperature is 40 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 40 ℃; the washing temperature is 55 ℃; the concentration of the sulfuric acid aqueous solution is 8 wt%; the concentration of the sodium hydroxide aqueous solution is 18 wt%; the pressure for pressurizing the coke oven is 1.4 KPa; the concentration of VOCs after combustion in the combustion process is 23mg/Nm3(ii) a The air volume in the boiler air distribution system is 10000 cubic meters per hour;
SO obtained after tail gas in the coking chemical system is subjected to the treatment2And NOxThe concentration is 23mg/m respectively3、39mg/m3。
Example 6
An environment-friendly zero-emission tail gas treatment process comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process comprises the steps of collecting tail gas in a coking chemical system in a closed manner, pretreating and washing, conveying by a fan, pressurizing by a coke oven, then conveying into a waste gas tray and a regenerator, blowing a chute into a combustion chamber for burning, and performing desulfurization and denitration treatment;
the oxygen content of the tail gas in the coking chemical system is 1.55 v%, and a combustion process is selected for tail gas treatment;
the pretreatment washing comprises acid washing, alkali washing and water washing, and the sequence is kept constant, wherein the acid washing comprises sulfuric acid aqueous solution, and the acid washing temperature is 20 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 20 ℃; the washing temperature is 55 ℃; the concentration of the sulfuric acid aqueous solution is 6.5 wt%; the concentration of the sodium hydroxide aqueous solution is 16 wt%; the pressure for pressurizing the coke oven is 1.3 KPa; the concentration of VOCs after combustion in the combustion process is 35mg/Nm3(ii) a The air volume of the fan in the fan conveying process is 12000 cubic meters per hour; the diameter of the inner wall of the pipeline is 400 mm;
SO obtained after tail gas in the coking chemical system is subjected to the treatment2And NOxThe concentration is respectively 26mg/m3、51mg/m3。
Example 7
An environment-friendly zero-emission tail gas treatment process comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process comprises the steps of collecting tail gas in a coking chemical system in a closed manner, pretreating and washing, conveying by a fan, pressurizing by a coke oven, then conveying into a waste gas tray and a regenerator, blowing a chute into a combustion chamber for burning, and performing desulfurization and denitration treatment;
the oxygen content of the tail gas in the coking chemical system is 1.55 v%, and a combustion process is selected for tail gas treatment;
the pretreatment washing comprises acid washing, alkali washing and water washing which are sequentially kept to be constant, wherein the acid washing comprises sulfuric acid aqueous solution, and the acid washing temperature is 60 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 60 ℃; the water washing temperature is 25 ℃; the concentration of the sulfuric acid aqueous solution is 6.5 wt%; the concentration of the sodium hydroxide aqueous solution is 16 wt%; the pressure for pressurizing the coke oven is 1.3 KPa; the concentration of VOCs after combustion in the combustion process is 32mg/Nm3(ii) a The air volume of the fan in the fan conveying process is 12000 cubic meters per hour; the diameter of the inner wall of the pipeline is 400 mm;
SO obtained after tail gas in the coking chemical system is subjected to the treatment2And NOxThe concentration is respectively 30mg/m3、62mg/m3。
Example 8
An environment-friendly zero-emission tail gas treatment process comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process comprises the steps of collecting tail gas in a coking chemical system in a closed manner, pretreating and washing, conveying by a fan, pressurizing by a coke oven, then conveying into a waste gas tray and a regenerator, blowing a chute into a combustion chamber for burning, and performing desulfurization and denitration treatment;
the oxygen content of the tail gas in the coking chemical system is 1.55 v%, and a combustion process is selected for tail gas treatment;
the pretreatment washing comprises alkali washing, acid washing and water washing, and the sequence is kept constant, wherein the acid washing comprises sulfuric acid aqueous solution, and the acid washing temperature is 40 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 40 ℃; the washing temperature is 55 ℃; the concentration of the sulfuric acid aqueous solution is 6.5 wt%; the concentration of the sodium hydroxide aqueous solution is 16 wt%; the pressure for pressurizing the coke oven is 1.3 KPa; the concentration of VOCs after combustion in the combustion process is 34mg/Nm3(ii) a The air volume of the fan in the fan conveying process is 12000 cubic meters per hour; the diameter of the inner wall of the pipeline is 400 mm;
said cokingSO after tail gas in chemical system is treated by the treatment2And NOxThe concentration is 28mg/m respectively3、59mg/m3。
Example 9
An environment-friendly zero-emission tail gas treatment process comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process comprises the steps of collecting tail gas in a coking chemical system in a closed manner, pretreating and washing, conveying by a fan, pressurizing by a coke oven, then conveying into a waste gas tray and a regenerator, blowing a chute into a combustion chamber for burning, and performing desulfurization and denitration treatment;
the oxygen content of the tail gas in the coking chemical system is 1.55 v%, and a combustion process is selected for tail gas treatment;
the pretreatment washing comprises alkali washing, water washing and acid washing, which are sequentially kept to be constant, wherein the acid washing comprises sulfuric acid aqueous solution, and the acid washing temperature is 40 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 40 ℃; the washing temperature is 55 ℃; the concentration of the sulfuric acid aqueous solution is 6.5 wt%; the concentration of the sodium hydroxide aqueous solution is 16 wt%; the pressure for pressurizing the coke oven is 1.3 KPa; the concentration of VOCs after combustion in the combustion process is 32mg/Nm3(ii) a The air volume of the fan in the fan conveying process is 12000 cubic meters per hour; the diameter of the inner wall of the pipeline is 400 mm;
SO obtained after tail gas in the coking chemical system is subjected to the treatment2And NOxThe concentration is 29mg/m respectively3、66mg/m3。
Example 10
An environment-friendly zero-emission tail gas treatment process comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process comprises the steps of collecting tail gas in a coking chemical system in a closed manner, pretreating and washing, conveying by a fan, pressurizing by a coke oven, then conveying into a waste gas tray and a regenerator, blowing a chute into a combustion chamber for burning, and performing desulfurization and denitration treatment;
the oxygen content of the tail gas in the coking chemical system is 1.55 v%, and a combustion process is selected for tail gas treatment;
the pretreatment washing comprises water washing, acid washing and alkali washing, and the sequence is kept constant, wherein the acid washing comprises sulfuric acid aqueous solution, and the acid washing temperature is 40 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 40 ℃; the washing temperature is 55 ℃; the concentration of the sulfuric acid aqueous solution is 6.5 wt%; the concentration of the sodium hydroxide aqueous solution is 16 wt%; the pressure for pressurizing the coke oven is 0.2 KPa; the concentration of VOCs after combustion in the combustion process is 31mg/Nm3(ii) a The air volume of the fan in the fan conveying process is 12000 cubic meters per hour; the diameter of the inner wall of the pipeline is 400 mm;
SO obtained after tail gas in the coking chemical system is subjected to the treatment2And NOxThe concentration is respectively 30mg/m3、76mg/m3。
Example 11
An environment-friendly zero-emission tail gas treatment process comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process comprises the steps of collecting tail gas in a coking chemical system in a closed manner, pretreating and washing, conveying by a fan, pressurizing by a coke oven, then conveying into a waste gas tray and a regenerator, blowing a chute into a combustion chamber for burning, and performing desulfurization and denitration treatment;
the oxygen content of the tail gas in the coking chemical system is 1.55 v%, and a combustion process is selected for tail gas treatment;
the pretreatment washing comprises acid washing, alkali washing and water washing, and the sequence is kept constant, wherein the acid washing comprises sulfuric acid aqueous solution, and the acid washing temperature is 40 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 40 ℃; the washing temperature is 55 ℃; the concentration of the sulfuric acid aqueous solution is 15 wt%; the concentration of the sodium hydroxide aqueous solution is 30 wt%; the pressure for pressurizing the coke oven is 1.3 KPa; the concentration of VOCs after combustion in the combustion process is 29mg/Nm3(ii) a The air volume of the fan in the fan conveying process is 12000 cubic meters per hour; the diameter of the inner wall of the pipeline is 400 mm;
the coking chemical systemSO of middle exhaust gas after the above treatment2And NOxThe concentration is respectively 25mg/m3、54mg/m3。
Example 12
An environment-friendly zero-emission tail gas treatment process comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process comprises the steps of collecting tail gas in a coking chemical system in a closed manner, pretreating and washing, conveying by a fan, pressurizing by a coke oven, then conveying into a waste gas tray and a regenerator, blowing a chute into a combustion chamber for burning, and performing desulfurization and denitration treatment;
the oxygen content of the tail gas in the coking chemical system is 1.55 v%, and a combustion process is selected for tail gas treatment;
the pretreatment washing comprises acid washing, alkali washing and water washing, and the sequence is kept constant, wherein the acid washing comprises sulfuric acid aqueous solution, and the acid washing temperature is 40 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 40 ℃; the washing temperature is 55 ℃; the concentration of the sulfuric acid aqueous solution is 1 wt%; the concentration of the sodium hydroxide aqueous solution is 5 wt%; the pressure for pressurizing the coke oven is 1.3 KPa; the concentration of VOCs after combustion in the combustion process is 27mg/Nm3(ii) a The air volume of the fan in the fan conveying process is 12000 cubic meters per hour; the diameter of the inner wall of the pipeline is 400 mm;
SO obtained after tail gas in the coking chemical system is subjected to the treatment2And NOxThe concentration is respectively 27mg/m3、59mg/m3。
Example 13
An environment-friendly zero-emission tail gas treatment process comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process comprises the steps of collecting tail gas in a coking chemical system in a closed manner, pretreating and washing, conveying by a fan, pressurizing by a coke oven, then conveying into a waste gas tray and a regenerator, blowing a chute into a combustion chamber for burning, and performing desulfurization and denitration treatment;
the oxygen content of the tail gas in the coking chemical system is 1.55 v%, and a combustion process is selected for tail gas treatment;
the pretreatment washing comprises acid washing, alkali washing and water washing, and the sequence is kept constant, wherein the acid washing comprises sulfuric acid aqueous solution, and the acid washing temperature is 40 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 40 ℃; the washing temperature is 55 ℃; the concentration of the sulfuric acid aqueous solution is 6.5 wt%; the concentration of the sodium hydroxide aqueous solution is 16 wt%; the pressure for pressurizing the coke oven is 0.8 KPa; the concentration of VOCs after combustion in the combustion process is 28mg/Nm3(ii) a The air volume of the fan in the fan conveying process is 12000 cubic meters per hour; the diameter of the inner wall of the pipeline is 400 mm;
SO obtained after tail gas in the coking chemical system is subjected to the treatment2And NOxThe concentration is respectively 25mg/m3、57mg/m3。
Example 14
An environment-friendly zero-emission tail gas treatment process comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process comprises the steps of collecting tail gas in a coking chemical system in a closed manner, pretreating and washing, conveying by a fan, pressurizing by a coke oven, then conveying into a waste gas tray and a regenerator, blowing a chute into a combustion chamber for burning, and performing desulfurization and denitration treatment;
the oxygen content of the tail gas in the coking chemical system is 1.55 v%, and a combustion process is selected for tail gas treatment;
the pretreatment washing comprises acid washing, alkali washing and water washing, and the sequence is kept constant, wherein the acid washing comprises sulfuric acid aqueous solution, and the acid washing temperature is 40 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 40 ℃; the washing temperature is 55 ℃; the concentration of the sulfuric acid aqueous solution is 6.5 wt%; the concentration of the sodium hydroxide aqueous solution is 16 wt%; the pressure for pressurizing the coke oven is 1.3 KPa; the concentration of VOCs after combustion in the combustion process is 24mg/Nm3(ii) a The air volume of the fan in the fan conveying process is 7000 cubic meters per hour; the diameter of the inner wall of the pipeline is 200 mm;
the tail gas in the coking chemical system is carried outSO after the above treatment2And NOxThe concentration is 23mg/m respectively3、51mg/m3。
Example 15
An environment-friendly zero-emission tail gas treatment process comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process comprises the steps of collecting tail gas in a coking chemical system in a closed manner, pretreating and washing, conveying by a fan, pressurizing by a coke oven, then conveying into a waste gas tray and a regenerator, blowing a chute into a combustion chamber for burning, and performing desulfurization and denitration treatment;
the oxygen content of the tail gas in the coking chemical system is 1.55 v%, and a combustion process is selected for tail gas treatment;
the pretreatment washing comprises acid washing, alkali washing and water washing, and the sequence is kept constant, wherein the acid washing comprises sulfuric acid aqueous solution, and the acid washing temperature is 40 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 40 ℃; the washing temperature is 55 ℃; the concentration of the sulfuric acid aqueous solution is 6.5 wt%; the concentration of the sodium hydroxide aqueous solution is 16 wt%; the pressure for pressurizing the coke oven is 1.3 KPa; the concentration of VOCs after combustion in the combustion process is 23mg/Nm3(ii) a The air volume of the fan in the fan conveying process is 20000 cubic meters per hour; the diameter of the inner wall of the pipeline is 600 mm;
SO obtained after tail gas in the coking chemical system is subjected to the treatment2And NOxThe concentration is 21mg/m respectively3、43mg/m3。
Example 16
An environment-friendly zero-emission tail gas treatment process comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process also comprises the steps of hermetically collecting tail gas in a coking chemical system, pretreating and washing the tail gas, feeding the tail gas into a boiler air distribution system for burning, and performing desulfurization and denitrification treatment;
the oxygen content of the tail gas in the coking chemical system is 0.56 v%, and a negative pressure recovery process is selected for tail gas treatment;
the negative pressure of the negative pressure recovery process is-1200 Pa; the negative pressure recovery process is controlled by a DCS automatic control system; the negative pressure recovery process is protected by a nitrogen sealing system.
Example 17
An environment-friendly zero-emission tail gas treatment process comprises the following process steps: a negative pressure recovery process and a combustion process; the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process also comprises the steps of hermetically collecting tail gas in a coking chemical system, pretreating and washing the tail gas, feeding the tail gas into a boiler air distribution system for burning, and performing desulfurization and denitrification treatment;
the oxygen content of the tail gas in the coking chemical system is 0.56 v%, and a negative pressure recovery process is selected for tail gas treatment;
the negative pressure of the negative pressure recovery process is-1000 Pa; the negative pressure recovery process is controlled by a DCS automatic control system; the negative pressure recovery process is protected by a nitrogen sealing system.
The foregoing examples are illustrative only, and serve to explain some of the features of the present disclosure. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. And that advances in science and technology will result in possible equivalents or sub-substitutes not currently contemplated for reasons of inaccuracy in language representation, and such changes should also be construed where possible to be covered by the appended claims.
Claims (8)
1. An environment-friendly zero-emission tail gas treatment process is characterized by at least comprising the following process steps: a negative pressure recovery process and a combustion process;
the negative pressure recovery process is to lead tail gas in a coking chemical system into a negative pressure area after the tail gas is sealed; the burning process comprises the steps of collecting tail gas in a coking chemical system in a closed manner, pretreating and washing, conveying by a fan, pressurizing by a coke oven, then conveying into a waste gas tray and a regenerator, blowing a chute into a combustion chamber for burning, and performing desulfurization and denitration treatment;
in the negative pressure recovery process, steam tracing is carried out on the VOC pipeline;
the burning process also comprises the steps of hermetically collecting tail gas in a coking chemical system, pretreating and washing the tail gas, feeding the tail gas into a boiler air distribution system for burning, and performing desulfurization and denitrification treatment;
when the oxygen content of the tail gas in the coking chemical system is less than 1 vol%, a negative pressure recovery process is adopted for tail gas treatment; and when the oxygen content of the tail gas in the coking chemical system is more than or equal to 1 vol%, the tail gas is treated by adopting a combustion process.
2. The environment-friendly zero-emission tail gas treatment process as claimed in claim 1, wherein the negative pressure of the negative pressure recovery process is-2000 to-1000 Pa; the negative pressure recovery process is controlled by a DCS automatic control system; the negative pressure recovery process is protected by a nitrogen sealing system.
3. The environmentally friendly zero-emission tail gas treatment process of claim 1, wherein the pre-treatment wash comprises at least one of acid wash, alkali wash, and water wash.
4. The environment-friendly zero-emission tail gas treatment process according to claim 3, wherein the acid washing is at least one of a sulfuric acid aqueous solution, a nitric acid aqueous solution and a hydrofluoric acid aqueous solution, and the acid washing temperature is 30-50 ℃; the alkaline washing is sodium hydroxide aqueous solution, and the alkaline washing temperature is 30-50 ℃; the water washing temperature is 40-70 ℃.
5. The environment-friendly zero-emission tail gas treatment process as claimed in claim 4, wherein the concentration of the sulfuric acid aqueous solution is 3-10 wt%; the concentration of the sodium hydroxide aqueous solution is 10-20 wt%.
6. The environment-friendly zero-emission tail gas treatment process of claim 1, wherein the pressure for pressurizing the coke oven is 1.0-1.5 KPa.
7. The environmentally friendly zero-emission tail gas treatment process of claim 1, wherein the concentration of VOCs after combustion in the combustion process is less than 30mg/Nm3。
8. The environment-friendly zero-emission tail gas treatment process as claimed in claim 1, wherein the air volume of the fan in the fan conveying process is 8000- > 15000 cubic meters per hour; the diameter of the inner wall of the pipeline is 300-500 mm.
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| CA2881218A1 (en) * | 2012-08-09 | 2014-02-13 | Thyssenkrupp Industrial Solutions Ag | Removing aromatic hydrocarbons from coke oven gas using biodiesel |
| CN108506735A (en) * | 2018-06-07 | 2018-09-07 | 上海梅山工业民用工程设计研究院有限公司 | A kind of coking waste gas recovery governing system |
| CN109307276A (en) * | 2018-10-30 | 2019-02-05 | 中冶焦耐(大连)工程技术有限公司 | It is a kind of with coal gas be sealing coking tail gas burning process |
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| CA2881218A1 (en) * | 2012-08-09 | 2014-02-13 | Thyssenkrupp Industrial Solutions Ag | Removing aromatic hydrocarbons from coke oven gas using biodiesel |
| CN108506735A (en) * | 2018-06-07 | 2018-09-07 | 上海梅山工业民用工程设计研究院有限公司 | A kind of coking waste gas recovery governing system |
| CN109307276A (en) * | 2018-10-30 | 2019-02-05 | 中冶焦耐(大连)工程技术有限公司 | It is a kind of with coal gas be sealing coking tail gas burning process |
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