CN113384984A - VOCs waste gas treatment system and waste gas treatment method in railway tank wagon cleaning process - Google Patents
VOCs waste gas treatment system and waste gas treatment method in railway tank wagon cleaning process Download PDFInfo
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- CN113384984A CN113384984A CN202110690376.XA CN202110690376A CN113384984A CN 113384984 A CN113384984 A CN 113384984A CN 202110690376 A CN202110690376 A CN 202110690376A CN 113384984 A CN113384984 A CN 113384984A
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Abstract
The invention provides a VOCs waste gas treatment system and a waste gas treatment method in the cleaning process of a railway tank wagon, wherein the system comprises a high-concentration waste gas pretreatment device and a high-temperature oxidation treatment device, and the output end of the high-concentration waste gas pretreatment device is communicated with the input end of the high-temperature oxidation treatment device; the high-concentration waste gas pretreatment device is used for performing sedimentation alkali washing pretreatment on high-concentration waste gas generated by cooking and displacement, the input end of the high-temperature oxidation treatment device is also communicated with the low-concentration waste gas exhaust end generated by washing and drying, and the high-temperature oxidation treatment device is used for performing high-temperature oxidation treatment on the mixed high-concentration waste gas and the mixed low-concentration waste gas. The invention can ensure high treatment efficiency and stable standard of emission concentration, thereby achieving the purposes of environmental protection, emission reduction and improvement of working environment of workers and air quality of surrounding environment.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to a VOCs waste gas treatment system and a waste gas treatment method in a railway tank wagon cleaning process.
Background
The railway tank car is an important tool for transporting liquid materials, and is widely applied to the transportation of substances such as petroleum, chemical engineering, edible oil and the like. The cleaning of the railway tank car is an important link in the transportation process of liquid logistics because the tank car needs to be cleaned internally before reloading materials or overhauling. The cleaning process of the tank car generally comprises the steps of removing residual oil, cleaning, drying by blowing, post-treatment and quality inspection, wherein the cleaning process is a key process for ensuring the quality and speed of tank washing and is also a process which has the greatest labor intensity and the most serious harm to workers in the traditional manual tank car cleaning method. Moreover, the manual cleaning and cleaning efficiency is low, the cost is high, and the generated waste gas is difficult to collect in a centralized manner. Manual cleaning is currently being gradually replaced by mechanical cleaning.
The tank car cleaning process of steaming tank, high-pressure water cleaning and drying is one of the best solutions aiming at the cleaning effect of the railway tank car at present, and the cleaning process is as follows: (1) after residual liquid in the oil tank truck is removed as clean as possible, high-temperature steam is firstly introduced into the tank body, the high-temperature steam cleaning is a physical cleaning process, the high-temperature steam is introduced into the tank by utilizing the characteristic of low viscosity of oil dirt at high temperature, and the oil dirt is converted into a liquid or gas state; (2) after reaching the suitable time of the steaming tank, introducing nitrogen into the tank body to displace the steam waste gas so as to ensure the safety of subsequent operation; (3) the high-pressure water cleaning process is carried out in a nitrogen environment, a high-pressure water cleaning system comprises a high-pressure water pump, a three-dimensional nozzle, a feeding mechanism, a traction device, a control operation system and the like, and the high-pressure water jet generated by a high-pressure cleaning machine is used for scouring the inner wall of the oil tank to achieve the purpose of cleaning; (4) finally, dry air is introduced into the tank for drying the inner wall.
Wash a jar operation in-process, the inside residual oil of jar can be along with steam, the outside loss of drying gas, produces a large amount of VOCs waste gas, and serious polluted environment influences ambient air quality and personnel health, if the concentration is higher when reaching explosion limit concentration even, can cause the explosion to cause the accident, has the potential safety hazard.
The treatment method of VOCs waste gas mainly includes the following steps: (1) adsorption method. The method is suitable for purifying low-concentration high-air-volume organic waste gas, but is not suitable for treating high-concentration organic waste gas due to limited adsorption capacity. (2) Absorption method. The harmful components in the waste gas are absorbed by the absorbent by utilizing the solubility or the chemical reaction characteristic difference of the components in the waste gas in the absorbent, thereby achieving the purpose of purifying the waste gas. (3) Condensation method. The method is suitable for the conditions of high concentration of waste gas and high recovery value. (4) A membrane separation method. Is suitable for treating high-concentration organic waste gas with recovery value. (5) Thermal destruction. The method is a widely applied organic waste gas treatment method, and the treatment process equipment is mature, and specifically comprises a direct combustion method, a catalytic combustion method, a regenerative thermal combustion method (RTO) and the like. The method is suitable for the occasions with small air quantity, high concentration and continuous discharge.
VOCs waste gas of the current railway tank wagon cleaning industry is mostly discharged in an unorganized form, or collection efficiency of a collection pipeline is low, so that the concentration of waste gas to be treated is low, and most pollutants are still discharged into the atmosphere. Even some enterprises are equipped with terminal treatment devices, most of the enterprises are still in the low-efficiency treatment processes such as spraying, low-temperature plasma, photocatalysis or single activated carbon adsorption, and the phenomenon undoubtedly can cause adverse effects on the environment. The mechanical tank washing is beneficial to centralized collection and treatment of pollutants, and in the process of gradually replacing manual cleaning by mechanical cleaning, the equipment for treating the tail end of the VOCs with high efficiency and stable standard is necessary for the mechanical tank washing process.
Disclosure of Invention
The invention aims to provide a VOCs waste gas treatment system and a waste gas treatment method in the cleaning process of a railway tank wagon, which can ensure high treatment efficiency and stable standard discharge concentration so as to achieve the purposes of environmental protection, emission reduction and improvement of the working environment of workers and the air quality of the surrounding environment.
In order to achieve the purpose, the invention provides the following technical scheme:
a VOCs waste gas treatment system in the cleaning process of a railway tank wagon comprises a high-concentration waste gas pretreatment device and a high-temperature oxidation treatment device, wherein the output end of the high-concentration waste gas pretreatment device is communicated with the input end of the high-temperature oxidation treatment device; the high-concentration waste gas pretreatment device is used for performing sedimentation alkali washing pretreatment on high-concentration waste gas generated by cooking and displacement, the input end of the high-temperature oxidation treatment device is also communicated with the low-concentration waste gas exhaust end generated by washing and drying, and the high-temperature oxidation treatment device is used for performing high-temperature oxidation treatment on the mixed high-concentration waste gas and the mixed low-concentration waste gas.
Further, still include the air mixing box, the air mixing box sets up between the intercommunication pipeline of high concentration waste gas preprocessing device and high temperature oxidation processing apparatus, and the air inlet of air mixing box still inserts low concentration waste gas, be used for with high concentration waste gas with low concentration waste gas mixes.
Further, high concentration waste gas preprocessing device includes the alkaline washing tower, the alkaline washing tower includes tower body and alkaline washing case, the tower body bottom sets up the waste liquid case, and the waste gas entry is seted up to the tower body lateral wall, and the waste gas export is seted up at the tower body top, the liquid outlet of alkaline washing case sets up the alkali wash pipeline, the play liquid end setting of alkali wash pipeline is in the waste gas entry top of tower body, just the play liquid end of alkali wash pipeline sets up a plurality of nozzles.
Further, the high-concentration waste gas pretreatment device also comprises a baffle plate, and the baffle plate is arranged between the exhaust end of the high-concentration waste gas and the waste gas inlet of the alkaline tower.
Further, a waste gas outlet of the alkaline tower is communicated with a gas inlet of the air mixing box, and a first fan is arranged on the communicating pipeline.
Further, the tower body of the alkaline tower also comprises a demister, and the demister is arranged at the waste gas outlet of the tower body.
Further, the high-temperature oxidation treatment device comprises a combustion furnace, and a second fan is arranged at the inlet of the combustion furnace.
Furthermore, the combustion furnace is a three-tower RTO combustion furnace, each tower chamber is provided with an air inlet channel, a purging channel and an exhaust channel, and the air inlet channel, the purging channel and the exhaust channel are provided with switching valves.
The invention also provides a VOCs waste gas treatment method in the railway tank wagon cleaning process, which comprises the following steps:
step one, pretreatment:
(1) removing oil mist: removing oil mist in the waste gas by passing the high-concentration waste gas generated by the high-temperature steam steaming tank and the nitrogen replacement process through a baffle plate to obtain a first treatment gas;
(2) alkali washing: washing and demisting the first treatment gas by alkali liquor, and removing sulfides in the gas to obtain a second treatment gas;
step two, gas mixing: mixing the low-concentration waste gas generated by the high-pressure water jet washing and filling and blowing drying process with the second treatment gas to obtain mixed waste gas;
step three, high-temperature oxidation: and carrying out high-temperature oxidation treatment on the mixed waste gas to remove VOCs components in the gas.
Further, in the third step, the temperature in the high-temperature oxidation treatment process is above 700 ℃.
The VOCs waste gas treatment system and the waste gas treatment method in the railway tank wagon cleaning process have the beneficial effects that:
(1) VOCs pollutants discharged inorganically in the tank car cleaning process are reduced;
(2) the tank washing mode and the characteristics of waste gas are comprehensively considered, and the two parts of waste gas are mixed, so that the problems of complex flow, difficulty in stably reaching the standard, high investment cost and operation cost and the like in the respective treatment of high-concentration waste gas and low-concentration waste gas are solved;
(3) the alkaline washing pretreatment can effectively remove sulfides possibly existing in the waste gas so as to prolong the service life of a heat accumulator in the RTO;
(4) the oil tank contains variable materials, the components of the tank washing waste gas are complex, the RTO has high tolerance to uncertain components, and can decompose small molecular hydrocarbons, so that the treatment efficiency is high;
(5) the method for treating the waste gas generated in the tank washing can ensure that the high treatment efficiency and the emission concentration stably reach the standard, so as to achieve the purposes of protecting the environment, reducing the emission and improving the working environment of workers and the air quality of the surrounding environment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the VOCs exhaust treatment system of the present invention;
FIG. 2 is a schematic flow diagram of the VOCs effluent treatment process of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, a system and a method for treating VOCs waste gas in a railway tank wagon cleaning process are described, wherein the system comprises a high-concentration waste gas pretreatment device and a high-temperature oxidation treatment device, and an output end of the high-concentration waste gas pretreatment device is communicated with an input end of the high-temperature oxidation treatment device; the high-concentration waste gas pretreatment device is used for performing sedimentation alkali washing pretreatment on high-concentration waste gas generated by cooking and displacement, the input end of the high-temperature oxidation treatment device is also communicated with the low-concentration waste gas exhaust end generated by washing and drying, and the high-temperature oxidation treatment device is used for performing high-temperature oxidation treatment on the mixed high-concentration waste gas and the mixed low-concentration waste gas.
As shown in fig. 1, according to a preferred embodiment of the present invention, the high-concentration exhaust gas pretreatment apparatus further comprises a wind mixing box 12, the wind mixing box 12 is disposed between the communication pipes of the high-concentration exhaust gas pretreatment apparatus and the high-temperature oxidation treatment apparatus, and the low-concentration exhaust gas is also introduced into the wind mixing box 12 at the gas inlet thereof for mixing the high-concentration exhaust gas and the low-concentration exhaust gas.
The high-concentration waste gas pretreatment device comprises a baffle plate 1 and an alkaline tower 2, wherein the baffle plate 1 is arranged between the exhaust end of the high-concentration waste gas and an alkaline tower waste gas inlet 3. The alkaline washing tower 2 comprises a tower body and an alkaline washing tank 4, a waste liquid tank 7 is arranged at the bottom of the tower body, an alkaline washing tower waste gas inlet 3 is formed in the side wall of the tower body, an alkaline washing tower waste gas outlet 9 is formed in the top of the tower body, an alkaline washing pipeline is arranged at a liquid outlet of the alkaline washing tank 4, a liquid outlet end of the alkaline washing pipeline is arranged above the waste gas inlet of the tower body, and a plurality of nozzles 6 are arranged at a liquid outlet end of the alkaline washing pipeline. The tower body of the alkaline tower 2 further comprises a demister 8, and the demister 8 is arranged at an alkaline tower waste gas outlet 9.
The waste gas outlet 9 of the alkaline washing tower is communicated with the gas inlet of the air mixing box 12, and the first fan 10 is arranged on the communicating pipeline. The high-temperature oxidation treatment device comprises a combustion furnace 14, and a second fan 13 is arranged at the inlet of the combustion furnace 14.
According to a preferred embodiment, the combustion furnace 14 is a three-tower RTO combustion furnace, each tower chamber is provided with an intake passage 16, a purge passage 17 and an exhaust passage 18, and the intake passage 16, the purge passage 17 and the exhaust passage 18 are provided with switching valves.
As shown in fig. 2, the automatic cleaning process of the railway tank wagon comprises the following steps: high-temperature steam steaming tank, nitrogen displacement, high-pressure water jet tank washing and blowing drying. The high-temperature steam steaming tank process can produce cooking waste gas, the nitrogen replacement process can produce replacement waste gas, the two parts of waste gas (hereinafter referred to as high-concentration waste gas) have the characteristics of small air quantity and high concentration, and the part of waste gas is judged to possibly contain sulfide according to the type of materials contained in the tank car. Adsorption and biological methods are not suitable for high concentration waste gas, membrane separation is not suitable for the limited recovery value, and thermal destruction is not suitable for the direct application because of the safety problem associated with too high concentration. Compared with the prior art, the air quantity of the washing waste gas generated in the high-pressure water jet tank washing process and the concentration of the drying waste gas (hereinafter referred to as low-concentration waste gas) generated in the blowing and drying process are large and low, and the combined process of adsorption, concentration and oxidation combustion is commonly applied to the waste gas with the characteristics.
Therefore, in the above embodiment:
(1) the boiling waste gas generated in the high-temperature steam retort process and the replacement waste gas generated in the nitrogen replacement process (hereinafter referred to as high-concentration waste gas) are subjected to sedimentation alkali washing pretreatment through a baffle plate 1 and an alkali washing tower 2, then mixed with the water washing waste gas generated in the high-pressure water jet retort washing process and the drying waste gas generated in the blowing drying process (hereinafter referred to as low-concentration waste gas) in a wind mixing box 12, and then enter a three-tower RTO combustion furnace for high-temperature oxidation treatment, and the clean waste gas is discharged into the atmosphere through an exhaust funnel 22.
(2) High concentration waste gas gets into exhaust treatment device through fan (above-mentioned first fan 10) air extraction effect, because the fan postposition makes front end waste gas collect and pipeline is in negative pressure state, can effectively avoid waste gas to leak.
(3) The high-concentration waste gas firstly passes through the baffle plate 1, and oil mist in the waste gas is removed through sedimentation and condensation. The inclination angle of the baffle plate is similar to the flow settlement angle of the settleable substances in the waste gas, partial particulate matters and viscous substances in the waste gas are removed through the effects of settlement and impact, and the treatment load of the subsequent process is reduced. The baffle plate has the advantages of simple structure, convenience in cleaning, small resistance and the like.
(4) Sulfides in the exhaust gas can cause plugging of the subsequent RTO regenerator, thereby reducing regenerator life, and thus require targeted pretreatment of the sulfides. When the oil tank contains materials containing sulfur, namely sulfide is contained in high-concentration waste gas, the waste gas at the outlet of the baffle plate 1 enters an alkaline washing tower 2; otherwise, the waste gas surpasses the alkaline tower 2 and directly enters a subsequent treatment device through a surpassing pipe 11.
(5) The sulfur-containing high-concentration waste gas enters the alkaline tower 2 from the lower part through the alkaline tower waste gas inlet 3, and is discharged through the alkaline tower waste gas outlet 9 after being sprayed and demisted. The alkali absorption liquid in the alkali liquid box 4 is conveyed to the nozzle 6 through the alkali liquid pump 5, the nozzle 6 sprays the alkali liquid into a plurality of fine liquid drops so as to increase the gas-liquid contact area and complete the mass transfer process of absorbing sulfide by the alkali liquid. The alkali absorption liquid in the alkali liquid box 4 needs to be supplemented periodically; the formed waste liquid falls to a waste liquid tank 7 at the bottom from top to bottom and is discharged out periodically; the sulfide in the waste gas is removed after the waste gas is sprayed by alkali, and the waste gas is discharged out of the alkali washing tower 2 after water mist is further removed by a demister 8 from bottom to top.
(6) After being pretreated, the high-concentration waste gas and the low-concentration waste gas enter the air mixing box 12 together to play a role in balancing temperature and concentration.
(7) The mixed waste gas with high and low concentration enters a three-tower RTO combustion furnace through an RTO fan (the second fan 13), and VOCs components in the waste gas are decomposed into CO under the high-temperature condition in the furnace2And H2O, clean gas exhaust RTO is exhausted to atmosphere through exhaust stack 22. The oxidation temperature of RTO combustion chamber sets up above 700 ℃, utilizes combustor 21 to provide the heat source, and the vast majority VOCs will be decomposed under this temperature, and the heat that the oxidative decomposition produced is absorbed by RTO bottom heat accumulator 15, switches over the waste gas through the diverter valve and walks the back for the intensification of RTO entry waste gas.
(8) The three-tower RTO combustion furnace is divided into three identical chamber bodies A, B, C, each chamber body is divided into three passages, namely an air inlet passage 16, a purging passage 17 and an air exhaust passage 18, which are respectively connected with corresponding exhaust gas pipelines, and the three chamber bodies are alternately used as air inlet, purging and air exhaust chamber bodies through the opening and closing of a switching valve. When waste gas enters the RTO through the chamber body A, the switching valve of the air inlet channel of the chamber body A is in an open state 20, and the switching valves of the other two channels are in a closed state 19; the waste gas passes through the corresponding heat accumulator 15 through the gas inlet channel 16, the heat left in the heat accumulator by the last cycle exhaust is used for heating the waste gas to be treated in the cycle, then the waste gas enters the upper part of the RTO, and the aim of decomposing VOCs at high temperature is fulfilled under the action of the burner 21; most of the clean high-temperature waste gas is discharged out of the RTO through the exhaust passage 18 of the chamber C, and the heat is retained on the heat accumulator 15 through the heat accumulator 15 in the discharging process to heat the next waste gas to be treated which circularly passes through the chamber C and enters the RTO; a small part of gas in the clean high-temperature waste gas is used for purging the heat accumulator of the chamber B to remove untreated waste gas remained in the heat accumulator 15 in the previous cycle process, so that the exhaust gas of the next cycle is prevented from exceeding the standard, the RTO is discharged through the purging channel 17 of the chamber B and is mixed with the waste gas to be treated again, and then the RTO enters the RTO along with the waste gas through the chamber C in the next cycle.
Ensuring that the VOCs treatment efficiency and the emission concentration stably reach the standard is the basic requirement for the waste gas treatment device. On the other hand, the liquid materials contained in the tank truck comprise gasoline, diesel oil, crude oil, asphalt and the like, which means that the components of the waste gas generated during cleaning are complicated and changeable, so that the tail end treatment device is required to be capable of adapting to the characteristic that the components of the waste gas are complicated and changeable. The working mode and the high-concentration and low-concentration waste gas characteristics of the automatic cleaning system of the oil tank truck are comprehensively considered, and a waste gas treatment process route of 'sedimentation alkali washing pretreatment + heat accumulation combustion' shown in figure 1 is considered. High-concentration waste gas is firstly subjected to sedimentation and condensation and alkali liquor spraying pretreatment through a baffle plate and an alkaline washing tower, then mixed with low-concentration waste gas in a mixing air box and then enters a three-tower RTO combustion furnace for high-temperature oxidation treatment, and clean waste gas is discharged into the atmosphere through an exhaust funnel.
In one embodiment, the mode of operation of the automatic cleaning system for a railway tank wagon may be considered as follows: three stations are arranged on the same tank washing line, and in the same time, a high-temperature steam steaming tank and a nitrogen replacement process are carried out on the station 1, a high-pressure water jet tank washing process is carried out on the station 2, and a blowing and drying process is carried out on the station 3. The exhaust gas flow and concentration are given in table 1 below:
table 1: exhaust gas flow and concentration
Depending on the high efficiency of RTO, the VOCs treatment efficiency of the whole set of waste gas treatment device can reach 98 percent, and the maximum allowable emission concentration of 120mg/m specified in the integrated emission Standard of atmospheric pollutants (GB16297-1996) is completely met. The exhaust gas treatment device generates operation cost in the actual operation process, and the part of the operation cost is as follows: the electricity consumption cost of the two fans and the lye pump, the natural gas cost used as the RTO temperature rise supplementary energy, the medicament and material consumption cost and the like.
The method for treating the VOCs waste gas in the automatic cleaning process of the railway tank wagon can effectively reduce the VOCs pollutants discharged inorganically in the cleaning process of the tank wagon, solves the problems of complex flow, difficulty in stably reaching the standard, high investment cost and operation cost and the like of respectively treating high-concentration waste gas and low-concentration waste gas, has high treatment efficiency on the waste gas containing complex sulfur components, can ensure that the discharged concentration stably reaches the standard, and finally achieves the purposes of protecting the environment, reducing emission and improving the working environment of workers and the air quality of the surrounding environment.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a VOCs exhaust-gas treatment system in railway tank wagon cleaning process which characterized in that: the device comprises a high-concentration waste gas pretreatment device and a high-temperature oxidation treatment device, wherein the output end of the high-concentration waste gas pretreatment device is communicated with the input end of the high-temperature oxidation treatment device; the high-concentration waste gas pretreatment device is used for performing sedimentation alkali washing pretreatment on high-concentration waste gas generated by cooking and displacement, the input end of the high-temperature oxidation treatment device is also communicated with the low-concentration waste gas exhaust end generated by washing and drying, and the high-temperature oxidation treatment device is used for performing high-temperature oxidation treatment on the mixed high-concentration waste gas and the mixed low-concentration waste gas.
2. The system for treating VOCs waste gas in the cleaning process of the railway tank wagon of claim 1, wherein: still include the air mixing box, the air mixing box sets up between the intercommunication pipeline of high concentration waste gas preprocessing device and high temperature oxidation processing apparatus, and the air inlet of air mixing box still inserts low concentration waste gas, be used for with high concentration waste gas with the low concentration waste gas mixes.
3. The system for treating VOCs waste gas in the cleaning process of the railway tank wagon of claim 2, wherein: high concentration waste gas preprocessing device includes the alkaline washing tower, the alkaline washing tower includes tower body and alkaline washing case, the tower body bottom sets up the waste liquid case, and the waste gas entry is seted up to the tower body lateral wall, and the waste gas export is seted up at the tower body top, the liquid outlet of alkaline washing case sets up the alkali wash pipeline, the play liquid end setting of alkali wash pipeline is in the waste gas entry top of tower body, just the play liquid end of alkali wash pipeline sets up a plurality of nozzles.
4. The system for treating VOCs waste gas in the cleaning process of the railway tank wagon of claim 3, wherein: the high-concentration waste gas pretreatment device further comprises a baffle plate, and the baffle plate is arranged between the exhaust end of the high-concentration waste gas and the waste gas inlet of the alkaline tower.
5. A VOCs waste gas treatment system in a railway tank wagon cleaning process according to claim 3 or 4, wherein: and a waste gas outlet of the alkaline tower is communicated with an air inlet of the air mixing box, and a first fan is arranged on the communicating pipeline.
6. The system for treating VOCs waste gas in the cleaning process of the railway tank wagon of claim 5, wherein: the tower body of the alkaline tower further comprises a demister, and the demister is arranged at a waste gas outlet of the tower body.
7. A VOCs waste gas treatment system in a railway tanker cleaning process according to any of the claims 1 to 4, characterized in that: the high-temperature oxidation treatment device comprises a combustion furnace, and a second fan is arranged at an inlet of the combustion furnace.
8. The system for treating VOCs waste gas in the cleaning process of the railway tank wagon of claim 7, wherein: the combustion furnace is a three-tower RTO combustion furnace, each tower chamber is provided with an air inlet channel, a purging channel and an exhaust channel, and the air inlet channel, the purging channel and the exhaust channel are provided with switching valves.
9. A VOCs waste gas treatment method in a railway tank wagon cleaning process is characterized by comprising the following steps: the method comprises the following steps:
step one, pretreatment:
(1) removing oil mist: removing oil mist in the waste gas by passing the high-concentration waste gas generated by the high-temperature steam steaming tank and the nitrogen replacement process through a baffle plate to obtain a first treatment gas;
(2) alkali washing: washing and demisting the first treatment gas by alkali liquor, and removing sulfides in the gas to obtain a second treatment gas;
step two, gas mixing: mixing the low-concentration waste gas generated by the high-pressure water jet washing and filling and blowing drying process with the second treatment gas to obtain mixed waste gas;
step three, high-temperature oxidation: and carrying out high-temperature oxidation treatment on the mixed waste gas to remove VOCs components in the gas.
10. The method for treating VOCs waste gas in the cleaning process of the railway tank wagon of claim 9, wherein the method comprises the following steps: in the third step, the temperature of the high-temperature oxidation treatment process is more than 700 ℃.
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Application publication date: 20210914 |