CN114288825A - VOCS peculiar smell odor treatment system - Google Patents
VOCS peculiar smell odor treatment system Download PDFInfo
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- CN114288825A CN114288825A CN202111582415.0A CN202111582415A CN114288825A CN 114288825 A CN114288825 A CN 114288825A CN 202111582415 A CN202111582415 A CN 202111582415A CN 114288825 A CN114288825 A CN 114288825A
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Abstract
The invention discloses a VOCS (volatile organic compounds) odor treatment system, which comprises a VOCS odor generation source, a gas collection and collection cover device, a gas collection and collection piping system, a pretreatment spray purification tower, a pretreatment circulating fan, an exhaust gas distribution piping system, a spray purification adsorption tower, a spray circulating pump set, a secondary treatment circulating booster fan, an exhaust chimney, a sewage treatment field biochemical treatment system and the like. The VOCS odor treatment system is provided with an automatic cut-off valve, a gas reflux valve and a matched piping system through an exhaust chimney. When monitoring data of VOCs gas, acid gas and alkaline gas on a purified gas discharge pipe system arranged on the spraying and purifying adsorption tower exceeds the standard, the automatic cut-off valve is automatically closed, the exhaust reflux valve is opened, circulating spraying and adsorption treatment is carried out, and the normal operation flow is returned until the detection data meet the indexes.
Description
Technical Field
The invention belongs to the field of industrial waste gas treatment, and particularly relates to a VOCS (volatile organic Compounds) odor treatment system and process in petroleum refining, petrochemical industry, coal chemical industry and other industries.
Background
According to the requirements of various industry standards such as national mandatory standards GB31570-2015 emission standard of petroleum refining industrial pollutants, GB31571-2015 emission standard of petrochemical industrial pollutants, GB31572-2015 emission standard of synthetic resin industrial pollutants and the like, the emission control of the atmospheric pollutants of newly-built enterprises from 7/1 of 2015 and the emission control of the atmospheric pollutants of the existing enterprises from 7/1 of 2017 does not execute the relevant regulations in the comprehensive emission standard of the atmospheric pollutants (GB16297-1996) and the emission standard of the atmospheric pollutants of industrial furnaces (GB9078-1996), and the emission limit, monitoring and supervision and management requirements of the atmospheric pollutants regulated in the standards are strictly executed. The national and social aspects pay more and more attention to the atmospheric environment protection, and governments of all parts also specify a plurality of assessment standards strictly meeting the national emission standard values and the emission index assessment requirements according to the requirements of the local environment protection and the economic and technical conditions.
The VOCS odor emitted by industries such as petroleum refining, petrochemical industry, coal chemical industry and the like has complex components, and the main components are petroleum hydrocarbons, hydrogen sulfide, sulfur dioxide, ammonia nitrogen and other volatile organic compounds. Although much work is done in the aspect of treating VOCS odor pollutants in the industry at present, the VOCs treatment technologies which are practical at present are numerous and mainly comprise adsorption, combustion (high-temperature incineration and catalytic combustion), absorption, condensation, biological treatment and combination technologies thereof. However, in general, the development and popularization of the technology still belong to the starting stage, and the following problems exist in different technical characteristics and the application of the technology in engineering.
1. The adsorption technology comprises the following steps: the method has the advantages of low cost, low energy requirement and high efficiency of removing various pollutants and odors, but has the defects of low adsorption efficiency when the humidity of the waste gas is high, unsuitability for the waste gas containing particles, high requirement on waste gas pretreatment, limited adsorption of certain compounds (such as ketones and styrene) and fire hazard during hot air regeneration.
2. Absorption technology: the technology has the advantages of simple process, low equipment cost, good treatment effect on water-soluble organic waste gas, no influence of high boiling point substances, no material consumption treatment problem and the like, but the problems of pollution transfer caused by discharging a large amount of waste water, easy blockage of a filler absorption tower, equipment corrosion and the like limit the improvement of the purification efficiency and wide application.
3. The combustion technology comprises the following steps: wide application range to pollutants, high treatment efficiency (up to more than 95%) and simple equipment are outstanding advantages of the technology. However, the operating temperature of the process equipment is high, and the fuel cost is high and the operating cost is high when the low-concentration VOCs are treated; NOx in the flue gas can exceed the standard when nitrogen-containing compounds are treated; the catalyst is easy to deactivate (sintering, poisoning and coking), and is not suitable for the treatment of compounds containing sulfur, halogen and the like; the price of the common noble metal catalyst is high; the application of the technology and equipment is also limited by a series of problems such as waste catalyst treatment.
4. Biological treatment systems (biofilters, biotrickettes, biological scrubbers, etc.): the equipment and operation cost is low, and the operation is simple; no secondary pollution is generated except for replacing the filler; the removal rate of low-concentration stink and peculiar smell is high. The disadvantage is that it is not suitable for treating high concentration exhaust gas; the universality is poor, and the strains are not suitable for selection or domestication when the mixed waste gas is treated; the requirement on pH value control is high; large occupied area, long detention time and low processing load.
5. Condensation technology: is generally used for recovering most valuable organic matters in the waste gas and is suitable for high-concentration gas treatment. But the single condensation needs to reach the standard and needs very low temperature, and the energy consumption is high; the purification degree is limited by the condensation temperature, and the operation cost is high; the additional refrigeration equipment is needed, and the important consideration is high investment, high energy consumption and high operating cost.
Because each technology has a certain application range, and has different requirements on waste gas components and factors such as concentration, temperature, humidity, air volume and the like, the technology is applied by adopting a combined process of different technologies. The best combination of aspects of technical feasibility and economy is always the target and the two choices faced by many enterprises in selecting treatment technical schemes.
Disclosure of Invention
In order to solve the problems, the invention discloses a VOCS odor treatment system, the used purified water impacts and adsorbs and purifies the barren solution/alkali liquor liquid film, and the system is nontoxic and harmless, and has clean and environment-friendly use process and safe and reliable operation environment. The waste adsorption liquid generated after adsorption can be recycled and reused, and no secondary pollution is generated.
A VOCS odor treatment system comprises a VOCS odor generation source, a gas collection device, a gas collection piping system, a pretreatment spray purification tower, a pretreatment circulating fan, an exhaust gas distribution piping system, a spray purification adsorption tower, a spray circulating pump set, a secondary treatment circulating booster fan, an exhaust chimney and a sewage treatment field biochemical treatment system.
The invention further improves that: the gas collection device is composed of a gas collection cover plate or a gas collection cover plate cover and is made of corrosion-resistant, wear-resistant and aging-resistant non-metallic materials or corrosion-resistant metal materials; the service life is longer than 15 years, and the continuous operation period is long; the gas collection and collection device has the maintenance bearing capacity, the uniformly distributed load value of the gas collection and collection device is not less than 20KN/m, and operation and maintenance personnel can conveniently perform maintenance, replacement and daily maintenance on equipment and materials. The gas collection collecting cover device is closed, certain balanced negative pressure can be kept when the system works, and the diffusion of volatile VOCS (volatile organic Compounds) odor can be prevented. The gas collection and collection devices are provided with overhaul observation ports and are provided with sealing doors which are convenient and quick to open and close; is convenient for observation and maintenance.
The invention further improves that: the gas collection and collection piping is made of corrosion-resistant, wear-resistant and aging-resistant non-metallic materials or corrosion-resistant metal materials, the service life is longer than 15 years, and the continuous operation period is long. The gas collection and collection piping is connected with the gas collection and collection device by adopting a quick hose joint; a filter screen which can be manually or automatically cleaned is arranged at the quick hose joint, and the front and the rear of the quick hose joint are respectively provided with a stop valve for stopping large-particle solid-phase mycelium in gas and liquid phase in a gas-liquid mixture generated by aeration; by operating the cut-off valve, VOCS odor generation sources of all branches can be cut out quickly; the exhaust inlets matched with the gas collection pipe system are uniformly arranged at the highest point in the middle of the gas collection device; the transverse gas collecting sections of the gas collecting and collecting pipe systems are provided with condensate discharging pipe systems; the condensate generated in the pipe system can be discharged periodically, so that the accumulation and the formation of air resistance are prevented, and the normal operation of the system is influenced.
The invention further improves that:
the pretreatment spray purification tower is sequentially provided with a first-stage spray liquid storage cavity, a first air inlet impact adsorption cavity, a first-stage water curtain sprayer, a first second-stage spray liquid storage cavity, a first second-stage water curtain sprayer, a first third-stage spray liquid storage cavity, a first third-stage water curtain sprayer, a first single-channel gas-liquid separator and a first purified gas discharge piping from bottom to top; the pretreatment spray purification tower is made of a corrosion-resistant, wear-resistant and aging-resistant non-metallic material or a corrosion-resistant metal material; the first primary spray liquid storage cavity, the first secondary spray liquid storage cavity and the first tertiary spray liquid storage cavity are all provided with a site and remote liquid level monitoring and measuring device I, a PH meter I and an automatic liquid supplementing valve I, so that automatic liquid level monitoring and automatic liquid supplementing can be realized; the air inlet pipe part of the first air inlet impact adsorption cavity is arranged in a submerged diffusion circumferential surface mode, so that the purpose of fully impacting and adsorbing the spray absorption liquid during air inlet can be achieved; the first primary water curtain sprayer, the first secondary water curtain sprayer and the first tertiary water curtain sprayer are all in a tower tray type; the first purified gas discharge piping system is provided with a VOCs gas monitoring probe, an acid gas monitoring probe and an alkaline gas monitoring probe; the purified gas is monitored in real time, so that the spraying amount of the first-level, second-level and third-level liquid spraying devices and the working parameters of the rectification system are adjusted according to the follow-up requirements, and the treatment effect of the system is optimal.
The invention further improves that: a partition plate is arranged in the shell of the single-channel gas-liquid separator, an air inlet is formed in the bottom of the shell, an exhaust opening is formed in the top of the shell, and a wire mesh defoaming assembly is arranged at the exhaust opening; a plurality of air inlet holes are uniformly formed in the circumferential surface of the partition plate; a gas through pipe is designed at the top of the gas inlet hole; the top of the gas through pipe is provided with a connecting rib plate; a stop cap is arranged at the top of the connecting rib plate; the top of the blocking cap is provided with a blocking plate; the purified gas with liquid enters the gas through-pipe through the gas inlet on the clapboard, collides with the blocking cap and the baffle plate violently, and is deflected for a plurality of times, so that the gas-liquid pre-separation is realized; the separated liquid enters the spray purification tower through an opening formed in the shell of the single-channel gas-liquid separator; the separated gas enters the wire mesh defoaming assembly again, is subjected to further gas-liquid separation and is discharged through the exhaust opening; the single-channel gas-liquid separator has the advantages of small volume, light weight, simple structure, high gas-liquid separation efficiency, small pressure drop, convenience in installation, operation and maintenance and the like, and the collection efficiency of the single-channel gas-liquid separator is more than 98% for mist with the particle size of more than or equal to 3-5 mu m. .
The invention further improves that: the pretreatment circulating fan and the secondary treatment circulating fan are both drainage type variable frequency fans, fan shells and impellers on the pretreatment circulating fan and the secondary treatment circulating fan are made of glass fiber reinforced plastics or corrosion-resistant metal materials, and inlets and outlets of the pretreatment circulating fan and the secondary treatment circulating fan are respectively provided with a flexible connection and air distribution valve and a sewage discharge hole; is convenient for daily pollution discharge and cleaning work. .
The invention further improves that: the exhaust gas distribution pipe system is provided with a plurality of branch gas distribution pipe systems, and each branch gas distribution pipe system is provided with a flow meter, an automatic regulating valve and an electric control system; the exhaust gas distribution pipe system is made of corrosion-resistant, wear-resistant and aging-resistant non-metallic materials or corrosion-resistant metal materials, the service life of the exhaust gas distribution pipe system is longer than 15 years, and the continuous operation period is long.
The invention further improves that: the spray purification adsorption tower is sequentially provided with a first-stage spray liquid storage cavity II, an air inlet impact adsorption cavity II, a first-stage water curtain sprayer II, a second-stage spray liquid storage cavity II, a second-stage water curtain sprayer II, an inorganic industrial filter material cavity, a thermal desorption device, a third-stage spray liquid storage cavity II, a third-stage water curtain sprayer II, a single-channel gas-liquid separator II and a purified gas discharge piping system II from bottom to top; the pretreatment spray purification tower is made of a corrosion-resistant, wear-resistant and aging-resistant non-metallic material or a corrosion-resistant metal material; the spray purification adsorption tower is provided with a primary spray liquid storage cavity II, an air inlet impact adsorption cavity II, a primary water curtain sprayer II, a secondary spray liquid storage cavity II, a secondary water curtain sprayer II, a tertiary spray liquid storage cavity II, a tertiary water curtain sprayer II, a single-channel gas-liquid separator II and a purified gas discharge piping system II from bottom to top in sequence, and the structural characteristics of the spray purification adsorption tower are required to be consistent with those of related parts of the pretreatment spray purification tower; permanent inorganic industrial filler is filled in the inorganic industrial filter material cavity; the thermal desorption device comprises a desorption fan, a heat exchanger and a connecting pipe system.
The invention further improves that: the spraying circulating pump group comprises a spraying pump, a liquid inlet pipe system, a one-way valve, a liquid outlet pipe system, a flowmeter, a pressure gauge assembly and an automatic control adjusting valve component; the spray pump is a chemical industry pump; the liquid inlet pipe system and the liquid outlet pipe system are made of stainless steel with excellent corrosion resistance;
the liquid inlet pipe system is connected with the spray pump; wherein the spray pump is connected with the liquid outlet pipe system through a one-way valve; the liquid outlet pipe system is sequentially provided with a pressure gauge assembly, a self-control regulating valve and a flowmeter; the spray pump is a chemical industry pump; the liquid inlet pipe system and the liquid outlet pipe system are made of stainless steel with excellent corrosion resistance.
The automatic control regulating valve can automatically regulate the opening according to the monitoring data of VOCs gas, acid gas and alkaline gas on the purified gas discharge pipe system arranged on the pretreatment spray purification tower and the spray purification adsorption tower, thereby forming PID feedback control.
The invention further improves that: the exhaust chimney is provided with an automatic cut-off valve, a gas reflux valve and a matched pipe system; when the monitoring data of the VOCs gas, the acid gas and the alkaline gas on the purified gas discharge pipe system arranged on the spray purification adsorption tower 7 exceeds the standard, the automatic cut-off valve is automatically closed, the exhaust gas reflux valve is opened, the circulating spray adsorption treatment is carried out, and the normal operation process is returned until the detection data meet the indexes.
The working principle of the invention is as follows:
all toxic and harmful gases such as high-concentration VOCs (volatile organic chemicals), peculiar smell, hydrogen sulfide and the like generated by a VOCS (volatile organic chemicals) peculiar smell and odor generation source (an oil removal process section of a sewage treatment plant) are sent into a pretreatment spray purification tower from a gas collection cover device through a gas collection piping system by a pretreatment circulating fan, and first-stage industrial water is adopted for cooling and absorbing heavy hydrocarbon, odor and peculiar smell; the second stage adopts alkali liquor to carry out neutralization reaction and absorption; and the third stage adopts purified water for spraying and washing to prevent the alkali liquor from corroding subsequent equipment facilities. The absorbed and adsorbed pretreated tail gas is input into an aeration aerobic tank of a biochemical system of a sewage treatment field through a pretreatment circulating fan to be subjected to biodegradation circulating treatment; simultaneously, waste gas such as VOCs, peculiar smell, odor and the like volatilized by an aeration aerobic pool of a biochemical system of a sewage treatment plant is sucked by a secondary treatment circulating booster fan, and is sprayed, washed and alkali-washed by a spraying purification adsorption tower, and then is input into the aeration aerobic pool of the biochemical system of the sewage treatment plant for circulating treatment and degradation digestion (volatile organic compounds of VOCs generated by petrochemical industry, more than eighty percent of volatile organic compounds are sulfurized organic compounds and alkane oil gas, the substances are good carbon sources of the biochemical system for sewage treatment, and the nutrients are organically utilized), so that the standard emission can be completely realized. The residual waste liquid generated in the spray purification adsorption tower can be directly sent into a sewage treatment field oil removal pretreatment system for treatment through a spray circulating pump group and a check valve, so that the harm of VOCs, peculiar smell and odor can be thoroughly eliminated, and the secondary pollution can not be caused.
Most of water-soluble odor substances (ammonia, amines and other water-soluble substances) in toxic and harmful gases and odor in the gas enter a water washing and alkali washing spraying filler area of the spraying purification adsorption tower to be effectively removed. If necessary, the permanent inorganic engineering filtering material tower in the technological system may be used to adsorb and treat to reach the high altitude exhaust level, and the adsorption tower has complete automatic desorption operation, complete facility and operation means. A circulating fan is matched with the biochemical process section of the sewage treatment field and is matched with the aeration fan of the biochemical process section for use, so that VOCs and odor volatilized by an anoxic or anaerobic process section and gas desorbed by a permanent inorganic engineering filter material tower can be collected and conveyed to an air inlet pipeline of the sewage treatment field, and closed circulation is realized.
The process has the following technical advantages:
(1) the VOCS peculiar smell and odor treatment system and the process have the characteristics of high waste gas treatment efficiency, high speed and the like.
(2) The VOCS peculiar smell and odor collection and treatment precision is high; the concentration of VOCS and odor at the outlet can meet the standard emission standard of national emission Standard of malodorous pollutants (GB14554-1993), and meets the index requirements of local related emission.
(3) The process is simple, and the atomizing spray adsorption resistance is small; adopt high-efficient tower disk atomizing to spray liquid film adsorption component and series flow absorption flow, atomizing sprays the adsorption resistance and is less than present widely used packed tower, whirl tower etc. greatly, can guarantee that waste gas gets into VOCs, foul smell peculiar smell smoothly and collects biochemical treatment system.
(4) The VOCS peculiar smell and odor collection and treatment process is safe and environment-friendly; the used purified water impact adsorption and adsorption purification barren solution/alkali liquor film is nontoxic and harmless, the use process is clean and environment-friendly, and the operation environment is safe and reliable. The waste adsorption liquid generated after adsorption can be recycled and reused, and no secondary pollution is generated.
(5) The pipeline has the advantages of small occupied area, flexible arrangement, reasonable and attractive appearance, full utilization of the field and original facilities and pipe networks, pipeline length reduction, pressure drop reduction and investment reduction.
Drawings
FIG. 1 is a schematic view of a VOCS odor treatment system and process of the present invention;
in the figure: the method comprises the following steps of 1-VOCS odor generation source, 2-gas collection cover plate (cover), 3-gas collection piping system, 4-pretreatment spray purification tower, 5-pretreatment circulating fan, 6-exhaust gas distribution piping system, 7-spray purification adsorption tower, 8-spray circulating pump set, 9-secondary treatment circulating fan, 10-exhaust chimney and 11-sewage treatment field biochemical treatment system.
FIG. 2 is a schematic diagram of the structure principle of the gas collection device (wherein, a is a schematic diagram of a gas collection cover plate, b is a schematic diagram of a gas collection cover, and the structure of the gas collection cover is shown as follows):
in the figure: 2-1-maintenance observation port and 2-2-sealing door.
FIG. 3 is a schematic diagram of the structure of the gas collection and collection piping system:
in the figure: 3-1-quick hose coupling; 3-2-a filter screen; 3-3-a cut-off valve; 3-4-air suction opening; 3-5-a transverse gas collection section; 3-6 rows of condensate pipelines.
FIG. 4 is a schematic diagram of the structural principle of the pretreatment spray purification tower:
in the figure: 4-1-first-stage spray liquid storage cavity I, 4-2-air inlet impact adsorption cavity I, 4-3-first-stage water curtain sprayer I, 4-4-second-stage spray liquid storage cavity I, 4-5-second-stage water curtain sprayer I, 4-6-third-stage spray liquid storage cavity I, 4-7-third-stage water curtain sprayer I, 4-8-single-channel gas-liquid separator I, 4-9-purified gas discharge pipe system I, 4-1-1-remote liquid level monitoring and measuring device, 4-1-2-PH meter, 4-1-3-automatic liquid supplementing valve and 4-2-1-air inlet pipe component;
FIG. 5 is a schematic structural view of a first single-channel gas-liquid separator;
in the figure: 4-8-1-baffle, 4-8-2-air inlet, 4-8-3-exhaust opening, 4-8-4-wire screen defoaming component, 4-8-1-1-air inlet, 4-8-5-gas through pipe, 4-8-6-connecting rib plate, 4-8-7-retaining cap, 4-8-8-8-baffle plate,
4-8-9-opening, 4-9-1-VOCs gas monitoring probe, 4-9-2-acid gas monitoring probe, 4-9-3-alkaline gas monitoring probe.
FIG. 6 is a schematic view of the structural principles of the pre-treatment circulating fan and the secondary treatment circulating fan:
in the figure: 5-1-a fan shell, 5-2-an impeller, 5-3-a flexible connection, 5-4-an air distribution valve and 5-5-a sewage discharge hole.
FIG. 7 is a schematic view of the structure of the vent gas distribution piping system:
in the figure: 6-1-branch air pipe system, 6-2-flowmeter, 6-3-automatic regulating valve and 6-4-electric control system.
FIG. 8 is a schematic diagram of the structural principle of a spray purification adsorption tower:
in the figure: 7-1-first-stage spray liquid storage cavity II, 7-2-air inlet impact adsorption cavity II, 7-3-first-stage water curtain sprayer II, 7-4-second-stage spray liquid storage cavity II, 7-5-second-stage water curtain sprayer II, 7-6-inorganic industrial filter material cavity, 7-7) thermal desorption device, 7-8-third-stage spray liquid storage cavity II, 7-9-third-stage water curtain sprayer II, 7-10-single-channel gas-liquid separator II, 7-11-purified gas discharge piping, 7-6-1-permanent inorganic industrial filler, 7-7-1-desorption fan, 7-7-2-heat exchanger and 7-7-3-connecting piping.
FIG. 9 is a schematic view of the exhaust stack structure:
in the figure: 10-1-an automatic cut-off valve, 10-2-a gas reflux valve and 10-3-a matching pipe system;
fig. 10 is a schematic structural view of a spray circulating pump group.
In the figure: 8-a spray circulating pump group; 8-1-spray pump, 8-2-liquid inlet pipe system, 8-3-one-way valve, 8-4-liquid outlet pipe system, 8-5-flowmeter, 8-6-pressure gauge assembly and 8-7-automatic control regulating valve.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1-10, the VOCS odor treatment system of the present embodiment includes a VOCS odor generation source 1, a gas collection device 2, a gas collection piping system 3, a pretreatment spray purification tower 4, a pretreatment circulating fan 5, an exhaust gas distribution piping system 6, a spray purification adsorption tower 7, a spray circulating pump set 8, a secondary treatment circulating fan 9, an exhaust chimney 10, and a sewage treatment plant biochemical treatment system 11.
As shown in fig. 2: the gas collection device 2 is composed of a gas collection cover plate or a gas collection cover plate cover and is made of corrosion-resistant, wear-resistant and aging-resistant non-metallic materials or corrosion-resistant metal materials; the gas collection device 2 is provided with an inspection and observation port 2-1 and is provided with sealing doors 2-2 which are convenient to open and close rapidly.
The gas collection and collection piping system 3 is made of corrosion-resistant, wear-resistant and aging-resistant non-metallic materials or corrosion-resistant metal materials, and the gas collection and collection piping system 3 is connected with the gas collection and collection device 2 by adopting a quick hose joint 3-1; a filter screen 3-2 which can be manually or automatically cleaned is arranged at the quick hose connector 3-1, and the front and the rear of the quick hose connector 3-1 are respectively provided with a cut-off valve 3-3; the exhaust inlets 3-4 matched with the gas collection piping system 3 are uniformly arranged at the highest point in the middle of the gas collection device 2; and the transverse gas collecting sections 3-5 of the gas collecting and collecting pipe system 3 are provided with condensate discharging pipe systems 3-6.
The pretreatment spray purification tower 4 is sequentially provided with a first-stage spray liquid storage cavity I4-1, a gas inlet impact adsorption cavity I4-2, a first-stage water curtain sprayer I4-3, a second-stage spray liquid storage cavity I4-4, a second-stage water curtain sprayer I4-5, a third-stage spray liquid storage cavity I4-6, a third-stage water curtain sprayer I4-7, a single-channel gas-liquid separator I4-8 and a purified gas discharge piping I4-9 from bottom to top; the pretreatment spray purification tower 4 is made of a corrosion-resistant, wear-resistant and aging-resistant non-metallic material or a corrosion-resistant metal material; the first-stage spraying liquid storage cavity I4-1, the second-stage spraying liquid storage cavity I4-4 and the third-stage spraying liquid storage cavity I4-6 are all provided with a field and remote liquid level monitoring and measuring device 4-1-1, a PH meter 4-1-2 and an automatic liquid supplementing valve 4-1-3, so that automatic liquid level monitoring and automatic liquid supplementing can be realized; the air inlet pipe part 4-2-1 of the air inlet impact adsorption cavity 4-2 is arranged in a submerged diffusion circumferential surface mode, so that the purpose of full impact adsorption with spray absorption liquid can be achieved during air inlet; the first-stage water curtain sprayer 4-3, the first-stage water curtain sprayer 4-5 and the first-stage water curtain sprayer 4-7 are all tower-tray type; and a VOCs gas monitoring probe 4-9-1, an acid gas monitoring probe 4-9-2 and an alkaline gas monitoring probe 4-9-3 are arranged on the purified gas discharge piping system I4-9.
A partition plate 4-8-1 is arranged in the shell of the single-channel gas-liquid separator 4-8, an air inlet 4-8-2 is arranged at the bottom, an exhaust opening 4-8-3 is arranged at the top, and a wire mesh defoaming component 4-8-4 is arranged at the exhaust opening; a plurality of air inlet holes 4-8-1-1 are uniformly formed on the circumferential surface of the partition plate 4-8-1; the top of the air inlet 4-8-1-1 is provided with an air through pipe 4-8-5; the top of the gas through pipe 4-8-5 is provided with a connecting rib plate 4-8-6; the top of the connecting rib plate 4-8-6 is provided with a stop cap 4-8-7; the top of the blocking cap 4-8-7 is provided with a blocking plate 4-8-8; the purified gas with liquid enters a gas through pipe 4-8-5 through a gas inlet 4-8-1-1 on a clapboard 4-8-1, collides with a baffle cap 4-8-7 and a baffle 4-8-8 violently, and is baffled for a plurality of times, so that the gas-liquid pre-separation is realized; the separated liquid enters a spray purification tower through an opening 4-8-9 arranged on the shell of the single-channel gas-liquid separator 4-8; the separated gas enters the wire mesh defoaming component 4-8-4 again, is further subjected to gas-liquid separation and is discharged through an exhaust opening;
the pretreatment circulating fan 5 and the secondary treatment circulating fan 9 are both drainage type variable frequency fans, fan shells 5-1 and impellers 5-2 on the pretreatment circulating fan 5 and the secondary treatment circulating fan 9 are made of glass fiber reinforced plastics or corrosion-resistant metal materials, and inlets and outlets of the pretreatment circulating fan 5 and the secondary treatment circulating fan 9 are respectively provided with a flexible connection 5-3 and an air distribution valve 5-4 and are provided with a sewage discharge hole 5-5.
The exhaust gas distribution pipe system 6 is provided with a plurality of branch gas management pipe systems 6-1, and each branch gas management pipe system 6-1 is provided with a flow meter 6-2, an automatic regulating valve 6-3 and an electric control system 6-4; the exhaust gas distribution pipe system 6 is made of a corrosion-resistant, wear-resistant and aging-resistant non-metallic material or a corrosion-resistant metal material.
The spray purification adsorption tower 7 is sequentially provided with a primary spray liquid storage cavity II 7-1, an air inlet impact adsorption cavity II 7-2, a primary water curtain sprayer II 7-3, a secondary spray liquid storage cavity II 7-4, a secondary water curtain sprayer II 7-5, an inorganic industrial filter material cavity 7-6, a thermal desorption device 7-7, a tertiary spray liquid storage cavity II 7-8, a tertiary water curtain sprayer II 7-9, a single-channel gas-liquid separator II 7-10 and a purified gas discharge piping system II 7-11 from bottom to top; the pretreatment spray purification tower 7 is made of a corrosion-resistant, wear-resistant and aging-resistant non-metallic material or a corrosion-resistant metal material; the spray purification adsorption tower 7 is provided with a primary spray liquid storage cavity II 7-1, an air inlet impact adsorption cavity II 7-2, a primary water curtain sprayer II 7-3, a secondary spray liquid storage cavity II 7-4, a secondary water curtain sprayer II 7-5, a tertiary spray liquid storage cavity II 7-8, a tertiary water curtain sprayer II 7-9, a single-channel gas-liquid separator II 7-10 and a purified gas exhaust pipe system II 7-11 from bottom to top in sequence, and the structural characteristics of the spray purification adsorption tower 7 are required to be consistent with those of related parts of the pretreatment spray purification tower 4; permanent inorganic industrial filler 7-6-1 is filled in the inorganic industrial filter material cavity 7-6; the thermal desorption device 7-7 comprises a desorption fan 7-7-1, a heat exchanger 7-7-2 and a connecting pipe system 7-7-3.
The spraying circulating pump group 8 comprises a spraying pump 8-1, a liquid inlet pipe system 8-2, a one-way valve 8-3, a liquid outlet pipe system 8-4, a flowmeter 8-5, a pressure gauge assembly 8-6 and an automatic control regulating valve 8-7; the spray pump 8-1 is a chemical industry pump; the liquid inlet pipe system 8-2 and the liquid outlet pipe system 8-4 are made of stainless steel with excellent corrosion resistance.
The liquid inlet pipe system 8-2 is connected with the spray pump 8-1; wherein the spray pump 8-1 is connected with the liquid outlet pipe system 8-4 through the one-way valve 8-3; the liquid outlet pipe system 8-4 is sequentially provided with a pressure gauge assembly 8-6, a self-control regulating valve 8-7 and a flowmeter 8-5; the spray pump 8-1 is a chemical industry pump; the liquid inlet pipe system 8-2 and the liquid outlet pipe system 8-4 are made of stainless steel with excellent corrosion resistance.
The exhaust chimney 10 is provided with an automatic cut-off valve 10-1, a gas reflux valve 10-2 and a matching pipe system 10-3.
In the embodiment, all toxic and harmful gases such as high-concentration VOCs (volatile organic chemicals), odor and hydrogen sulfide and the like generated by a VOCS (volatile organic chemicals) odor generation source (oil removal process section of a sewage treatment plant) are sent into a pretreatment spraying purification tower 4 from a gas collection and collection cover device 2 through a gas collection and collection piping system 3 by a pretreatment circulating fan, and first-stage industrial water is adopted for cooling and absorbing heavy hydrocarbon, odor and odor; the second stage adopts alkali liquor to carry out neutralization reaction and absorption; and the third stage adopts purified water for spraying and washing to prevent the alkali liquor from corroding subsequent equipment facilities. The absorbed and adsorbed pretreated tail gas is input into an aeration aerobic tank of a biochemical system of a sewage treatment field through a pretreatment circulating fan to be subjected to biodegradation circulating treatment; simultaneously, waste gas such as VOCs, peculiar smell, odor and the like volatilized by an aeration aerobic pool of a biochemical system of a sewage treatment plant is sucked by a secondary treatment circulating booster fan, and is sprayed, washed and alkali-washed by a spraying purification adsorption tower, and then is input into the aeration aerobic pool of the biochemical system of the sewage treatment plant for circulating treatment and degradation digestion (volatile organic compounds of VOCs generated by petrochemical industry, more than eighty percent of volatile organic compounds are sulfurized organic compounds and alkane oil gas, the substances are good carbon sources of the biochemical system for sewage treatment, and the nutrients are organically utilized), so that the standard emission can be completely realized. The residual waste liquid generated in the spray purification adsorption tower 7 can be directly sent into a sewage treatment field oil removal pretreatment system for treatment through a spray circulating pump group and a check valve, so that the harm of VOCs, peculiar smell and odor can be thoroughly eliminated, and the secondary pollution can not be caused.
Most of water-soluble odor substances (ammonia, amines and other water-soluble substances) in toxic and harmful gases and odor in the gas enter a water washing and alkali washing spraying filler area of the spraying purification adsorption tower to be effectively removed. If necessary, the permanent inorganic engineering filtering material tower in the technological system may be used to adsorb and treat to reach the high altitude exhaust level, and the adsorption tower has complete automatic desorption operation, complete facility and operation means. A circulating fan is matched with the biochemical process section of the sewage treatment field and is matched with the aeration fan of the biochemical process section for use, so that VOCs and odor volatilized by an anoxic or anaerobic process section and gas desorbed by a permanent inorganic engineering filter material tower can be collected and conveyed to an air inlet pipeline of the sewage treatment field, and closed circulation is realized.
Experimental comparison data
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.
Claims (10)
1. A VOCS peculiar smell odor treatment system is characterized in that: the device comprises a VOCS odor generation source (1), a gas collection device (2), a gas collection pipe system (3), a pretreatment spray purification tower (4), a pretreatment circulating fan (5), an exhaust gas distribution pipe system (6), a spray purification adsorption tower (7), a spray circulating pump set (8), a secondary treatment circulating fan (9), an exhaust chimney (10) and a sewage treatment field biochemical treatment system (11).
2. A VOCS off-flavor odor treatment system as claimed in claim 1, wherein: the gas collection device (2) is composed of a gas collection cover plate or a gas collection cover plate cover and is made of corrosion-resistant, wear-resistant and aging-resistant non-metallic materials or corrosion-resistant metal materials; the gas collection and collection device (2) is provided with an overhaul observation port (2-1) and is provided with sealing doors (2-2) which are convenient to open and close rapidly.
3. A VOCS off-flavor odor treatment system as claimed in claim 1, wherein: the gas collection and collection piping system (3) is made of corrosion-resistant, wear-resistant and aging-resistant non-metallic materials or corrosion-resistant metal materials, and the gas collection and collection piping system (3) is connected with the gas collection and collection device (2) by adopting a quick hose joint (3-1); a filter screen (3-2) capable of being manually or automatically cleaned is arranged at the quick hose connector (3-1), and the front and the rear of the quick hose connector (3-1) are respectively provided with a cut-off valve (3-3); the exhaust inlets (3-4) matched with the gas collection and collection piping system (3) are uniformly arranged at the highest point of the middle part of the gas collection and collection device (2); and the transverse gas collecting sections (3-5) of the gas collecting and collecting pipe system 3 are provided with condensate discharging pipe systems (3-6).
4. A VOCS off-flavor odor treatment system as claimed in claim 1, wherein: the pretreatment spray purification tower (4) is sequentially provided with a first-stage spray liquid storage cavity I (4-1), a first air inlet impact adsorption cavity I (4-2), a first-stage water curtain sprayer I (4-3), a second-stage spray liquid storage cavity I (4-4), a second-stage water curtain sprayer I (4-5), a third-stage spray liquid storage cavity I (4-6), a third-stage water curtain sprayer I (4-7), a single-channel gas-liquid separator I (4-8) and a purified gas discharge piping I (4-9) from bottom to top; the pretreatment spray purification tower (4) is made of a corrosion-resistant, wear-resistant and aging-resistant non-metallic material or a corrosion-resistant metal material; the first-stage spraying liquid storage cavity I (4-1), the second-stage spraying liquid storage cavity I (4-4) and the third-stage spraying liquid storage cavity I (4-6) are respectively provided with a field and remote liquid level monitoring and measuring device (4-1-1), a PH meter (4-1-2) and an automatic liquid supplementing valve (4-1-3), so that automatic liquid level monitoring and automatic liquid supplementing can be realized; the air inlet pipe part (4-2-1) of the air inlet impact adsorption cavity I (4-2) is arranged in a submerged diffusion circumferential surface mode, so that the purpose of fully impacting and adsorbing the spray absorption liquid during air inlet can be achieved; the first primary water curtain sprayer (4-3), the first secondary water curtain sprayer (4-5) and the first tertiary water curtain sprayer (4-7) are all in a tower tray type; and a VOCs gas monitoring probe (4-9-1), an acid gas monitoring probe (4-9-2) and an alkaline gas monitoring probe (4-9-3) are arranged on the purified gas discharge piping system I (4-9).
5. A VOCS off-flavor odor treatment system and process according to claim 4, wherein: a partition plate (4-8-1) is arranged in the shell of the single-channel gas-liquid separator I (4-8), an air inlet (4-8-2) is arranged at the bottom of the shell, an exhaust opening (4-8-3) is arranged at the top of the shell, and a wire mesh defoaming assembly (4-8-4) is arranged at the exhaust opening; a plurality of air inlet holes (4-8-1-1) are uniformly formed in the circumferential surface of the partition plate (4-8-1); the top of the air inlet (4-8-1-1) is provided with an air through pipe (4-8-5); the top of the gas through pipe (4-8-5) is provided with a connecting rib plate (4-8-6); the top of the connecting rib plate (4-8-6) is provided with a stop cap (4-8-7); the top of the blocking cap (4-8-7) is provided with a baffle (4-8-8); the purified gas with liquid enters a gas through pipe (4-8-5) through a gas inlet (4-8-1-1) on a clapboard (4-8-1), collides with a blocking cap (4-8-7) and a baffle (4-8-8) violently, and is baffled for many times, so that gas-liquid pre-separation is realized; the separated liquid enters a spray purification tower through an opening (4-8-9) arranged on the shell of a single-channel gas-liquid separator I (4-8); the separated gas enters the wire mesh defoaming component (4-8-4) again, is further subjected to gas-liquid separation, and is discharged through the exhaust opening.
6. A VOCS off-flavor odor treatment system as claimed in claim 1, wherein: the pretreatment circulating fan (5) and the secondary treatment circulating fan (9) are drainage type variable frequency fans, fan shells (5-1) and impellers (5-2) on the pretreatment circulating fan (5) and the secondary treatment circulating fan (9) are made of glass fiber reinforced plastics or corrosion-resistant metal materials, and inlets and outlets of the pretreatment circulating fan (5) and the secondary treatment circulating fan (9) are respectively provided with a flexible connection (5-3) and an air distribution valve (5-4) and are provided with a sewage discharge hole (5-5).
7. A VOCS off-flavor odor treatment system as claimed in claim 1, wherein: the exhaust gas distribution pipe system (6) is provided with a plurality of branch air distribution pipe systems (6-1), and each branch air distribution pipe system (6-1) is provided with a flow meter (6-2), an automatic regulating valve (6-3) and an electric control system (6-4); the exhaust gas distribution pipe system 6 is made of a corrosion-resistant, wear-resistant and aging-resistant non-metallic material or a corrosion-resistant metal material.
8. A VOCS off-flavor odor treatment system as claimed in claim 1, wherein: the spray purification adsorption tower (7) is sequentially provided with a first-stage spray liquid storage cavity II (7-1), an air inlet impact adsorption cavity II (7-2), a first-stage water curtain sprayer II (7-3), a second-stage spray liquid storage cavity II (7-4), a second-stage water curtain sprayer II (7-5), an inorganic industrial filter material cavity (7-6), a thermal desorption device (7-7), a third-stage spray liquid storage cavity II (7-8), a third-stage water curtain sprayer II (7-9), a single-channel gas-liquid separator II (7-10) and a purified gas discharge piping system II (7-11) from bottom to top; the pretreatment spray purification tower (7) is made of a corrosion-resistant, wear-resistant and aging-resistant non-metallic material or a corrosion-resistant metal material; the spray purification adsorption tower (7) is provided with a first-stage spray liquid storage cavity II (7-1), an air inlet impact adsorption cavity II (7-2), a first-stage water curtain sprayer II (7-3), a second-stage spray liquid storage cavity II (7-4), a second-stage water curtain sprayer II (7-5), a third-stage spray liquid storage cavity II (7-8), a third-stage water curtain sprayer II (7-9), a single-channel gas-liquid separator II (7-10) and a purified gas discharge piping system II (7-11) from bottom to top in sequence, and the structural characteristics of the spray purification adsorption tower II (7) are required to be consistent with those of related parts of the pretreatment spray purification tower (4); permanent inorganic industrial filler (7-6-1) is filled in the inorganic industrial filter material cavity (7-6); the thermal desorption device (7-7) comprises a desorption fan (7-7-1), a heat exchanger (7-7-2) and a connecting pipe system (7-7-3).
9. A VOCS off-flavor odor treatment system as claimed in claim 1, wherein: the spraying circulating pump group (8) comprises a spraying pump (8-1), a liquid inlet pipe system (8-2), a one-way valve (8-3), a liquid outlet pipe system (8-4), a flowmeter (8-5), a pressure gauge assembly (8-6) and an automatic control regulating valve (8-7); the liquid inlet pipe system (8-2) is connected with the spray pump (8-1); wherein the spray pump (8-1) is connected with the liquid outlet pipe system (8-4) through a one-way valve (8-3); the liquid outlet pipe system (8-4) is sequentially provided with a pressure gauge assembly (8-6), a self-control regulating valve (8-7) and a flowmeter (8-5); the spray pump (8-1) is a chemical industrial pump; the liquid inlet pipe system (8-2) and the liquid outlet pipe system (8-4) are made of stainless steel with excellent corrosion resistance.
10. A VOCS off-flavor odor treatment system and process as claimed in claim 1, wherein: the exhaust chimney (10) is provided with an automatic cut-off valve (10-1), a gas reflux valve (10-2) and a matched pipe system (10-3).
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| CN115814575A (en) * | 2022-12-23 | 2023-03-21 | 浙江东油能源科技有限公司 | Efficient and sufficient methanol steam recycling equipment |
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