CN111056680A - System and method for on-site purification and cyclic utilization of industrial flare water-sealed tank sewage - Google Patents
System and method for on-site purification and cyclic utilization of industrial flare water-sealed tank sewage Download PDFInfo
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- CN111056680A CN111056680A CN201911282469.8A CN201911282469A CN111056680A CN 111056680 A CN111056680 A CN 111056680A CN 201911282469 A CN201911282469 A CN 201911282469A CN 111056680 A CN111056680 A CN 111056680A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B1/00—Methods or layout of installations for water supply
- E03B1/04—Methods or layout of installations for water supply for domestic or like local supply
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/08—Thin film evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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Abstract
The invention discloses an on-site purification and cyclic utilization system and method for industrial flare water sealed tank sewage, which mainly comprise a pretreatment unit, a thermal oxidation unit and a gas-liquid separation unit, wherein the pretreatment unit, the thermal oxidation unit and the gas-liquid separation unit are sequentially connected; the pretreatment unit is arranged behind the water-sealed tank and mainly comprises a solid settling unit and/or a filtering unit, and the thermal oxidation unit is provided with a preheater and low-temperature catalytic oxidation equipment; the preheater is provided with a cold process inlet, a cold process outlet, a hot process inlet and a hot process outlet, and the hot process inlet of the preheater is connected with the high-temperature purified gas outlet of the low-temperature catalytic oxidation equipment through a pipeline; the cold process outlet is connected with the fluid inlet of the low-temperature catalytic oxidation heat equipment through a pipeline; and an inlet of the gas-liquid separation unit is communicated with a thermal path outlet of the heat exchanger, a liquid phase water outlet of the gas-liquid separation unit is communicated with a water seal tank pipeline and a post-treatment pipeline, and a gas outlet of the gas-liquid separation unit discharges ultra-clean exhaust gas.
Description
Technical Field
The invention belongs to the field of industrial sewage treatment, and particularly relates to an on-site purification and recycling system and method for industrial flare water sealed tank sewage.
Background
The torch system is an important facility for ensuring normal production and accident emergency treatment in the fields of petrochemical industry and the like, and combustible gas which cannot be utilized and is continuously or discontinuously discharged comprises toxic and harmful combustible gas, can be combusted and treated by the torch system, and is purified into nontoxic and harmless gas to be discharged. Therefore, safe operation of the flare system is very important in chemical production.
The water seal tank is important key equipment for preventing backfire in the flare system, and simultaneously, recoverable flare gas can be discharged to the flare gas recovery system through the pressure of the water seal liquid level. In recent years, the scale of petrochemical production is getting larger, the development of petrochemical equipment tends to be in an integrated form, the maximum discharge amount of flare gas is increased year by year, and the volume of a corresponding water-sealed tank is also increased remarkably. The discharge of flare gas will raise the COD value of the water in the water-sealed tank and may form an oil layer. The sewage treatment of the flare system generally comprises the steps that the sewage of each water-sealed tank is pumped to the sewage treatment system through a collecting pump, when the flare gas is discharged frequently or equipment is started and stopped, the discharge amount of the flare gas is increased, the COD (chemical oxygen demand) value and the oil content of the sewage of the water-sealed tank exceed control indexes, the load of the sewage treatment system is increased, and the treatment difficulty is greatly increased. In northwest arid water-deficient areas, chemical production puts a great pressure on the consumption of local water resources, so a set of equipment for recycling the sewage of a torch system is developed to relieve the pressure of industrial water and be beneficial to protecting the local natural environment.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an on-site purification and recycling system and method for industrial flare water sealed tank sewage; the system can realize zero discharge of sewage in the torch unit, and furthest recovers the system drainage on site and returns the system drainage to the water-sealed tank for use; the system can thermally oxidize organic matters in the sewage into clean gas and water, and adopts a low-temperature catalytic thermal oxidation technology, so that open fire is avoided in the low-temperature oxidation process of the organic matters, and the problem of fire prevention distance in a new torch boundary area is avoided; the ultra-clean exhaust gas of the system is carbon dioxide, water, nitrogen and oxygen, and NOx and smoke dust are not generated; the technical scheme of the invention has wide adaptability to the COD value of the water-sealed tank sewage, can adapt to the organic matter concentration of sewage in different periods of the same water-sealed tank, can also process different water-sealed tank sewage in the same torch unit and the water-sealed tank sewage of different torch units in a compact prying block mode, and has high flexibility and wide application range.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an industrial flare water-sealed tank sewage on-site purification and recycling system mainly comprises a pretreatment unit, a thermal oxidation unit and a gas-liquid separation unit, wherein the pretreatment unit, the thermal oxidation unit and the gas-liquid separation unit are sequentially connected;
the pretreatment unit is arranged behind the water-sealed tank and mainly comprises a solid settling unit and/or a filtering unit, and solid pollutants are removed by settling and/or filtering the water-sealed tank sewage; the pretreatment unit is connected with the thermal oxidation unit through a sewage pump;
the thermal oxidation unit is provided with a preheater and low-temperature catalytic oxidation equipment, and the low-temperature catalytic oxidation equipment is arranged on one side of the preheater; the preheater is provided with a cold process inlet, a cold process outlet, a hot process inlet and a hot process outlet, and the hot process inlet of the preheater is connected with the high-temperature purified gas outlet of the low-temperature catalytic oxidation equipment through a pipeline; the cold process outlet is connected with the fluid inlet of the low-temperature catalytic oxidation heat equipment through a pipeline;
the fluid is air and sewage, the air and the sewage from which solid pollutants are removed are heated by a preheater and then are conveyed to low-temperature catalytic oxidation equipment; the low-temperature catalytic oxidation equipment is used for carrying out low-temperature oxidation after receiving the air and the sewage which are heated and transmitted by the preheater, and then supplying high-temperature purified gas to the preheater to exchange heat with the air and the sewage;
the hot path outlet of the heat exchanger of the gas-liquid separation unit is communicated with the inlet of the gas-liquid separation unit, the liquid phase water outlet of the gas-liquid separation unit is communicated with the water seal tank pipeline and the post-treatment pipeline, and the gas outlet of the gas-liquid separation unit discharges ultra-clean exhaust gas.
And discharging the high-temperature purified gas from the high-temperature purified gas outlet of the preheater to a gas-liquid separation unit, wherein the gas part is directly discharged from a gas discharge port, and the liquid-phase water is returned to a water seal tank from a liquid-phase water outlet through a pipeline or is further collected and processed.
Wherein, the preheater is a corrugated pipe, a threaded pipe or a channel pipe high-efficiency preheater.
As a preferred technical scheme of the application, an electric heater is further arranged between the preheater and the low-temperature catalytic oxidation equipment, and when the thermal oxidation starting temperature is not reached, the electric heater is assisted with electric heating to heat the fluid and then convey the fluid to the low-temperature catalytic oxidation equipment.
As a preferred technical solution of the present application, the solid settling unit is a settling tank.
As a preferred technical solution of the present application, the filtering unit is a filter; preferably, the filter is a gravity filter, a vacuum filter and a pressure filter.
As a preferred technical scheme of the application, the preheater is an air preheater or a sewage preheater;
the cold process inlet of the sewage preheater is connected with a sewage pump, the cold process outlet is connected to the fluid inlet of the low-temperature catalytic oxidation equipment, the cold process inlet of the air preheater is connected with clean air, and the cold process outlet is connected to the fluid inlet of the low-temperature catalytic oxidation equipment;
the hot process inlets of the air preheater and the sewage preheater are connected in parallel to the high-temperature purified gas outlet of the low-temperature catalytic oxidation equipment; the hot process outlet is connected in parallel with the inlet of the gas-liquid separation unit, and high-temperature purified gas after heat exchange of air and sewage in the air preheater and the sewage preheater enters the gas-liquid separation unit through the inlet of the gas-liquid separation unit.
As a preferred technical scheme of the application, a falling film evaporator is connected between the preheater and the gas-liquid separation equipment;
the heat path inlet of the preheater is connected with the high-temperature purified gas outlet of the low-temperature catalytic oxidation equipment through a pipeline, the heat path outlet of the preheater is connected to the high-temperature purified gas inlet of the falling film evaporator, and the high-temperature purified gas outlet of the falling film evaporator is connected with the inlet of the gas-liquid separation unit; the falling film evaporator is also provided with a sewage feed inlet and a sewage discharge outlet; the sewage inlet of the falling-film evaporator is connected to the water outlet pipeline of the sewage pump, and the sewage outlet of the falling-film evaporator is connected with the water seal tank and the post-treatment pipeline through pipelines; an air inlet is arranged on the side wall of the sewage discharge hole of the falling film evaporator, and an air outlet is arranged opposite to the air inlet; the air pipeline is respectively connected with an air inlet of a sewage discharge port of the falling film evaporator and a cold stroke inlet of the preheater; and an air outlet of the falling film evaporator is connected to a cold stroke inlet of the preheater.
Wherein, the falling-film evaporator is an internal-corrugated external-thread pipe, a high-flux pit pipe or a channel pipe falling-film evaporator.
As a preferred technical scheme of the present application, the sewage pump is also directly connected with a fluid inlet of the low-temperature catalytic oxidation equipment; and a part of sewage enters the low-temperature catalytic oxidation equipment after being preheated by the preheater, and a part of sewage directly enters the low-temperature catalytic oxidation equipment.
As a preferred technical scheme of this application, be equipped with the sewage pump between water-sealed tank and the preprocessing unit.
As a preferred embodiment of the present application, the gas-liquid separation unit is a gas-liquid separator.
A treatment method of an industrial flare water sealed tank sewage on-site purification and recycling system comprises the following steps:
(1) the sewage from the water-sealed tank is settled and/or filtered by a pretreatment unit to remove solid pollutants, and then enters a preheater by using a sewage pump;
(2) air and the sewage from step (1) for removing solid pollutants enter a preheater cold process, the temperature of the sewage is raised by the preheater, and then the sewage is conveyed to low-temperature catalytic oxidation equipment; the low-temperature catalytic oxidation equipment is used for purifying air and sewage which are heated and transmitted by the preheater, and then supplying oxidized high-temperature purified gas to the preheater to exchange heat with cold-process air and sewage;
(3) the high-temperature purified gas from the hot-path outlet of the preheater is discharged into a gas-liquid separation unit, the gas part is directly discharged from a gas discharge port after being separated by the gas-liquid separation unit, and the liquid-phase water is sent back to a water seal tank from a liquid-phase water outlet through a pipeline or is further collected and processed through a pipeline.
Advantageous effects
Compared with the prior art, the system and the method for on-site purification and cyclic utilization of the industrial flare water sealed tank sewage have the following beneficial effects:
(1) the system can realize zero discharge of sewage in the torch unit, and furthest recovers the system drainage on site and returns the system drainage to the water-sealed tank for use;
(2) the system can thermally oxidize organic matters in the sewage into clean gas and water, and adopts a low-temperature catalytic thermal oxidation technology, so that open fire is avoided in the low-temperature oxidation process of the organic matters, and the problem of fire prevention distance in a new torch boundary area is avoided;
(3) the ultra-clean exhaust gas of the system is carbon dioxide, water, nitrogen and oxygen, and NOx and smoke dust are not generated;
(4) the technical scheme of the invention has wide adaptability to the COD value of the water-sealed tank sewage, can adapt to the organic matter concentration of sewage in different periods of the same water-sealed tank, can also process different water-sealed tank sewage in the same torch unit and the water-sealed tank sewage of different torch units in a compact prying block mode, and has high flexibility and wide application range.
Drawings
FIG. 1 is a schematic structural view of embodiment 1 of the present invention;
FIG. 2 is a schematic structural view of embodiment 2 of the present invention;
wherein 1, water sealing the tank; 2-a first sewage pump; 3-a pretreatment unit; 4-a second sewage pump; 5-low temperature catalytic oxidation equipment; 6-air preheater; 71-a sewage preheater; 72-falling film evaporator; 8-gas-liquid separator.
Detailed Description
In order that the present invention may be more clearly understood, the following detailed description is given in conjunction with the examples. The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
Example 1
Fig. 1 shows an embodiment of the present invention, wherein fig. 1 is a schematic structural diagram of the present invention. Referring to fig. 1, the on-site purification and recycling system for industrial flare water sealed tank sewage mainly comprises a pretreatment unit 3, a thermal oxidation unit and a gas-liquid separator 8, wherein the pretreatment unit 3, the thermal oxidation unit and the gas-liquid separator 8 are sequentially connected;
the pretreatment unit 3 is connected with the water-sealed tank through a first sewage pump 2 and is connected through the first sewage pump 2, the pretreatment unit 3 is provided with a settling tank and a filter, and solid pollutants are removed by settling and filtering sewage in the water-sealed tank 1; the pretreatment unit 3 is connected with the thermal oxidation unit through a second sewage pump 4;
the thermal oxidation unit is provided with an air preheater 6, a sewage preheater 71 and a low-temperature catalytic oxidation device 5, wherein a cold-process inlet of the sewage preheater 71 is connected with the second sewage pump 4, a cold-process outlet is connected to a fluid inlet of the low-temperature catalytic oxidation device 5, a cold-process inlet of the air preheater 6 is connected to clean air, and a cold-process outlet is connected to a fluid inlet of the low-temperature catalytic oxidation device 5; the hot-path inlets of the air preheater 6 and the sewage preheater 71 are connected in parallel with the high-temperature purified gas outlet of the low-temperature catalytic oxidation equipment 5; the hot process outlet is connected in parallel with the inlet of the gas-liquid separator 8, and the high-temperature purified gas after heat exchange of air and sewage in the air preheater 6 and the sewage preheater 71 enters the gas-liquid separation unit through the inlet of the gas-liquid separator 8;
the fluid is air and sewage, the air and the sewage from which solid pollutants are removed are heated by a preheater and then are conveyed to low-temperature catalytic oxidation equipment; the low-temperature catalytic oxidation equipment is used for carrying out low-temperature oxidation after receiving the air and the sewage which are heated and transmitted by the preheater, and then supplying high-temperature purified gas to the preheater to exchange heat with the air and the sewage;
the hot-process outlets of the air preheater 6 and the sewage preheater 71 are connected into the inlet of a gas-liquid separator 8 in parallel, the liquid-phase water outlet of the gas-liquid separator 8 is communicated with the pipeline of the water-sealed tank 1 and the post-treatment pipeline, and the gas outlet of the gas-liquid separator 8 discharges ultra-clean exhaust gas; the high-temperature purified gas from the high-temperature purified gas outlets of the air preheater 6 and the sewage preheater 71 is discharged to the gas-liquid separator 8, wherein the gas portion is directly discharged from the gas discharge port, and the liquid-phase water is returned from the liquid-phase water outlet to the water-sealed tank 1 through a pipeline or subjected to further collection processing.
Wherein, an electric heater (not shown in the figure) is also arranged between the preheater and the low-temperature catalytic oxidation equipment, and when the thermal oxidation starting temperature is not reached, the electric heater is assisted to heat the fluid and then convey the fluid to the low-temperature catalytic oxidation equipment; the second sewage pump is also directly connected with a fluid inlet of the low-temperature catalytic oxidation equipment; and a part of sewage enters the low-temperature catalytic oxidation equipment after being preheated by the preheater, and a part of sewage directly enters the low-temperature catalytic oxidation equipment.
The treatment method of the industrial flare water sealed tank sewage on-site purification and recycling system comprises the following steps: the first sewage pump 2 pumps the sewage containing organic matters in the water-sealed tank 1 to the pretreatment unit 3 to remove solid impurities in the sewage, and the sewage from which the solid impurities are removed is pumped to a sewage preheater 71 by a second sewage pump 4 and then sent to the low-temperature catalytic oxidation equipment 5; or directly pumped to the low-temperature catalytic oxidation equipment 5 by the water pump 4; the low-temperature catalytic oxidation equipment 5 realizes low-temperature oxidation at 250-600 ℃, and open fire does not exist in the thermal oxidation unit.
And a proper amount of fresh air is fed into the air preheater 6, and the fresh air is preheated and then completely gasifies and mixes the sewage pumped by the second sewage pump 4 to reach the thermal oxidation starting temperature (the temperature is not enough and can be assisted by electric heating) required by the low-temperature catalytic oxidation equipment 5. The air supply quantity meets the safety requirement that the mixed gas is lower than 25 percent LEL, and the temperature of the discharged gas at the outlet of the low-temperature catalytic oxidation device 5 is lower than the allowable temperature. If the concentration of organic matters in the sewage is high and the air supply amount is small, the temperature in the low-temperature catalytic oxidation apparatus 5 is raised too high, thereby damaging the catalyst and other components, and possibly exceeding the allowable temperature of the air preheater 6 and the sewage preheater 71.
The discharged gas from the outlet of the low-temperature catalytic oxidation equipment 5 enters a gas-liquid separator 8 after being subjected to heat exchange and temperature reduction through an air preheater 6 and a sewage preheater 71, and the separated liquid-phase water is sent back to the water seal tank 1 or is further collected and processed. The ultra-clean exhaust gas is carbon dioxide, water, nitrogen and oxygen.
Wherein, according to needs, the high-efficient preheater of bellows, screwed pipe or channel pipe can be selected to the preheater.
Example 2
Fig. 2 shows an embodiment of the present invention, wherein fig. 2 is a schematic structural diagram of the present invention. Referring to fig. 2, the on-site purification and recycling system for industrial flare water sealed tank sewage mainly comprises a pretreatment unit 3, a thermal oxidation unit and a gas-liquid separator 8, wherein the pretreatment unit 3, the thermal oxidation unit and the gas-liquid separator 8 are connected in sequence;
the pretreatment unit 3 is arranged behind the water-sealed tank 1, comprises a solid settling tank and a filter, and removes solid pollutants by settling and filtering the sewage in the water-sealed tank 1; the pretreatment unit 3 is connected with the thermal oxidation unit through a second sewage pump 4;
the thermal oxidation unit is provided with an air preheater 6, a falling-film evaporator 72 and a low-temperature catalytic oxidation device 5, a heat path inlet of the air preheater 6 is connected with a high-temperature purified gas outlet of the low-temperature catalytic oxidation device 5 through a pipeline, and a heat path outlet of the air preheater 6 is connected with a high-temperature purified gas inlet of the falling-film evaporator 72; the falling film evaporator 72 is also provided with a sewage inlet and a sewage outlet; the sewage inlet of the falling-film evaporator 72 is connected to the water outlet pipeline of the sewage pump, and the sewage outlet of the falling-film evaporator 72 is connected with the water seal tank 1 and the post-treatment pipeline through pipelines; the side wall of the sewage discharge hole of the falling film evaporator 72 is provided with an air inlet, and the opposite side is provided with an air outlet; the air pipeline is respectively connected with an air inlet of a sewage discharge port of the falling film evaporator 72 and a cold stroke inlet of the air preheater 6; the air outlet of the falling film evaporator 72 is connected to the cold side inlet of the air preheater.
The outlet of the gas-liquid separator 8 and the high-temperature purified gas outlet of the falling film evaporator 72 are connected with the inlet of the gas-liquid separator 8; and a liquid phase water outlet of the gas-liquid separator 8 is communicated with the water seal tank 1 pipeline and the post-treatment pipeline, and an ultra-clean exhaust gas is discharged from a gas outlet of the gas-liquid separator 8.
An electric heater is arranged between the air preheater 6 and the low-temperature catalytic oxidation equipment 5, and when the thermal oxidation starting temperature is not reached, the electric heater is assisted to heat fluid and then convey the fluid to the low-temperature catalytic oxidation equipment 5; the second sewage pump 4 is also directly connected with a fluid inlet of the low-temperature catalytic oxidation equipment 5; and a part of sewage enters the low-temperature catalytic oxidation equipment after being preheated by the preheater, and a part of sewage directly enters the low-temperature catalytic oxidation equipment.
Wherein, according to the requirement, the falling film evaporator can be selected from an internal corrugated external threaded pipe, a high-flux pit pipe or a channel pipe falling film evaporator.
The treatment method of the industrial flare water sealed tank sewage on-site purification and recycling system comprises the following steps: the first sewage pump 2 pumps the sewage containing organic matters in the water-sealed tank 1 to a solid settling tank and a filter to remove solid impurities in the sewage, and the sewage from which the solid impurities are removed is pumped to a falling film evaporator 72 by a second sewage pump 4 and then sent to a low-temperature catalytic oxidation device 5; or the water can be directly pumped to the low-temperature catalytic oxidation equipment 5 by the water pump 4, the low-temperature catalytic oxidation equipment 5 realizes low-temperature oxidation at 250-600 ℃, and open fire does not exist in a thermal oxidation unit.
A proper amount of fresh air is mixed with the water vapor containing the organic matters from the falling film evaporator 72 before being sent to the air preheater 6; or sending a proper amount of fresh air to the bottom of the falling-film evaporator 72, recovering part of heat of the heated sewage at the bottom, mixing with the water vapor of the organic waste gas, and then entering the air preheater 6. After the mixed gas of air and organic waste gas steam is heated to the thermal oxidation starting temperature required by the low-temperature catalytic oxidation device 5 (the temperature is not enough and can be assisted by electric heating), the mixed gas enters the low-temperature catalytic oxidation device 5 to carry out thermal oxidation on organic matters. The air supply quantity meets the safety requirement that the mixed gas is lower than 25 percent LEL, and the temperature of the discharged gas at the outlet of the low-temperature catalytic oxidation device 5 is lower than the allowable temperature, for example, the sewage has higher organic matter concentration and the air supply quantity is smaller, so that the temperature in the low-temperature catalytic oxidation device 5 is increased, the catalyst and other components are damaged, and the allowable temperature of the air preheater 6 and the falling film evaporator 72 can be exceeded.
The gas discharged from the outlet of the thermal oxidation unit 5 is subjected to heat exchange and temperature reduction by the air preheater 6 and the falling film evaporator 72 in sequence and then enters the gas-liquid separator 8, and the liquid phase water separated by the separator 8 and the liquid phase water output by the falling film evaporator 72 can be sent back to the water seal tank 1 or further collected and processed. The ultra-clean exhaust gas is carbon dioxide, water, nitrogen and oxygen.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" as used herein is intended to include both the individual components or both.
The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components via other components.
The protection of the present invention is not limited to the above embodiments. Variations and advantages that may occur to those skilled in the art may be incorporated into the invention without departing from the spirit and scope of the inventive concept and the scope of the appended claims is intended to be protected.
Claims (8)
1. An industrial flare water-sealed tank sewage on-site purification and recycling system is characterized by mainly comprising a pretreatment unit, a thermal oxidation unit and a gas-liquid separation unit, wherein the pretreatment unit, the thermal oxidation unit and the gas-liquid separation unit are sequentially connected;
the pretreatment unit is arranged behind the water-sealed tank and mainly comprises a solid settling unit and/or a filtering unit, and solid pollutants are removed by settling and/or filtering the water-sealed tank sewage; the pretreatment unit is connected with the thermal oxidation unit through a sewage pump;
the thermal oxidation unit is provided with a preheater and low-temperature catalytic oxidation equipment, and the low-temperature catalytic oxidation equipment is arranged on one side of the preheater; the preheater is provided with a cold process inlet, a cold process outlet, a hot process inlet and a hot process outlet, and the hot process inlet of the preheater is connected with the high-temperature purified gas outlet of the low-temperature catalytic oxidation equipment through a pipeline; the cold process outlet is connected with the fluid inlet of the low-temperature catalytic oxidation heat equipment through a pipeline;
the fluid is air and sewage, the air and the sewage from which solid pollutants are removed are heated by a preheater and then are conveyed to low-temperature catalytic oxidation equipment; the low-temperature catalytic oxidation equipment is used for carrying out low-temperature oxidation after receiving the air and the sewage which are heated and transmitted by the preheater, and then supplying high-temperature purified gas to the preheater to exchange heat with the air and the sewage;
the hot path outlet of the heat exchanger of the gas-liquid separation unit is communicated with the inlet of the gas-liquid separation unit, the liquid phase water outlet of the gas-liquid separation unit is communicated with the water seal tank pipeline and the post-treatment pipeline, and the gas outlet of the gas-liquid separation unit discharges ultra-clean exhaust gas;
and discharging the high-temperature purified gas from the high-temperature purified gas outlet of the preheater to a gas-liquid separation unit, wherein the gas part is directly discharged from a gas discharge port, and the liquid-phase water is returned to a water seal tank from a liquid-phase water outlet through a pipeline or is further collected and processed.
2. The system for on-site purification and recycling of sewage generated by water-sealed tanks of industrial torches of claim 1, wherein an electric heater is further disposed between the preheater and the low-temperature catalytic oxidation device, and when the thermal oxidation starting temperature is not reached, the electric heater is assisted by electric heating to heat the fluid and then convey the fluid to the low-temperature catalytic oxidation device.
3. The industrial flare water-sealed tank sewage on-site purification and recycling system of claim 1, wherein the preheater is both an air preheater and a sewage preheater;
the cold process inlet of the sewage preheater is connected with a sewage pump, the cold process outlet is connected to the fluid inlet of the low-temperature catalytic oxidation equipment, the cold process inlet of the air preheater is connected with clean air, and the cold process outlet is connected to the fluid inlet of the low-temperature catalytic oxidation equipment;
the hot process inlets of the air preheater and the sewage preheater are connected in parallel to the high-temperature purified gas outlet of the low-temperature catalytic oxidation equipment; the hot process outlet is connected in parallel with the inlet of the gas-liquid separation unit, and high-temperature purified gas after heat exchange of air and sewage in the air preheater and the sewage preheater enters the gas-liquid separation unit through the inlet of the gas-liquid separation unit.
4. The in-situ purification and recycling system for industrial flare water-sealed tank sewage as recited in claim 1, wherein a falling film evaporator is further connected between the preheater and the gas-liquid separation equipment;
the heat path inlet of the preheater is connected with the high-temperature purified gas outlet of the low-temperature catalytic oxidation equipment through a pipeline, the heat path outlet of the preheater is connected to the high-temperature purified gas inlet of the falling film evaporator, and the high-temperature purified gas outlet of the falling film evaporator is connected with the inlet of the gas-liquid separation unit; the falling film evaporator is also provided with a sewage feed inlet and a sewage discharge outlet; the sewage inlet of the falling-film evaporator is connected to the water outlet pipeline of the sewage pump, and the sewage outlet of the falling-film evaporator is connected with the water seal tank and the post-treatment pipeline through pipelines; an air inlet is arranged on the side wall of the sewage discharge hole of the falling film evaporator, and an air outlet is arranged opposite to the air inlet; the air pipeline is respectively connected with an air inlet of a sewage discharge port of the falling film evaporator and a cold stroke inlet of the preheater; and an air outlet of the falling film evaporator is connected to a cold stroke inlet of the preheater.
5. The industrial flare water-sealed tank sewage in-situ purification and recycling system of claim 4, wherein the falling film evaporator is an internal-corrugated external-threaded pipe, a high-flux pit pipe or a grooved pipe falling film evaporator.
6. The industrial flare water-sealed tank sewage in-situ purification and recycling system of claim 1, wherein the preheater is a corrugated, threaded or grooved tube high efficiency preheater.
7. The industrial flare water-sealed tank sewage in-situ purification and recycling system of claim 1, wherein the sewage pump is further directly connected with a fluid inlet of a low temperature catalytic oxidation device; and a part of sewage enters the low-temperature catalytic oxidation equipment after being preheated by the preheater, and a part of sewage directly enters the low-temperature catalytic oxidation equipment.
8. The method for treating the industrial flare water sealed tank sewage on-site purification and recycling system as claimed in claim 1, which is characterized by comprising the following steps:
(1) the sewage from the water-sealed tank is settled and/or filtered by a pretreatment unit to remove solid pollutants, and then enters a preheater by using a sewage pump;
(2) air and the sewage from step (1) for removing solid pollutants enter a preheater cold process, the temperature of the sewage is raised by the preheater, and then the sewage is conveyed to low-temperature catalytic oxidation equipment; the low-temperature catalytic oxidation equipment is used for purifying air and sewage which are heated and transmitted by the preheater, and then supplying oxidized high-temperature purified gas to the preheater to exchange heat with cold-process air and sewage;
(3) the high-temperature purified gas from the hot-path outlet of the preheater is discharged into a gas-liquid separation unit, the gas part is directly discharged from a gas discharge port after being separated by the gas-liquid separation unit, and the liquid-phase water is sent back to a water seal tank from a liquid-phase water outlet through a pipeline or is further collected and processed through a pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911282469.8A CN111056680A (en) | 2019-12-13 | 2019-12-13 | System and method for on-site purification and cyclic utilization of industrial flare water-sealed tank sewage |
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| CN201911282469.8A CN111056680A (en) | 2019-12-13 | 2019-12-13 | System and method for on-site purification and cyclic utilization of industrial flare water-sealed tank sewage |
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| CN114477346A (en) * | 2022-02-22 | 2022-05-13 | 张东清 | Treatment system and treatment method for sewage containing organic pollutants |
| CN114517846A (en) * | 2020-11-20 | 2022-05-20 | 中国石油化工股份有限公司 | Water seal system for acid gas and flare combustion system |
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| CN114477346A (en) * | 2022-02-22 | 2022-05-13 | 张东清 | Treatment system and treatment method for sewage containing organic pollutants |
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