CN112755716B - Tail gas purification method and device for online analysis - Google Patents
Tail gas purification method and device for online analysis Download PDFInfo
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- CN112755716B CN112755716B CN202011381097.7A CN202011381097A CN112755716B CN 112755716 B CN112755716 B CN 112755716B CN 202011381097 A CN202011381097 A CN 202011381097A CN 112755716 B CN112755716 B CN 112755716B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0003—Condensation of vapours; Recovering volatile solvents by condensation by using heat-exchange surfaces for indirect contact between gases or vapours and the cooling medium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0033—Other features
- B01D5/0036—Multiple-effect condensation; Fractional condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0033—Other features
- B01D5/0054—General arrangements, e.g. flow sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
- B01D5/0072—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with filtration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/0087—Recirculating of the cooling medium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/009—Collecting, removing and/or treatment of the condensate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a tail gas purification method and a device for on-line analysis, wherein tail gas is extracted from a tail gas source to a tail gas loop, the tail gas is condensed by a heat exchanger and is subjected to gas-liquid separation by a filter, the separated tail gas flows into a refrigerant inlet of the heat exchanger and is used as a refrigerant to condense the tail gas which initially enters the tail gas loop, and finally flows out from a refrigerant outlet of the heat exchanger and flows back to the tail gas source, the separated liquid phase flows into an oil collecting tank through a pipeline, and oil gas volatilized by the oil collecting tank flows back to an outlet of the tail gas source through the pipeline; the cold energy of tail gas liquefaction is provided by a refrigerant loop, the refrigerant in the liquid storage device flows in from the refrigerant inlet of the heat exchanger to condense the tail gas, and the refrigerant flowing out from the refrigerant outlet of the heat exchanger flows into the liquid storage device after separation and condensation treatment to form a circulation loop. The invention realizes internal circulation of tail gas condensation and recovery, has no emission of the device, can perform emission protection of VOCS, NMHC and other gases, reduces pollution to the environment and increases economic benefit.
Description
Technical Field
The invention belongs to the technical field of tail gas analysis treatment, and particularly relates to a tail gas purification method and device for on-line analysis.
Background
With the continuous development and improvement of the economic level of China, the production safety problem of dangerous chemicals is more and more emphasized. At present, online analytical instruments are widely applied to sampling, detecting and analyzing gas in high-pollution industries such as petroleum, chemical engineering, metallurgy, medicine and the like, and control or safety protection is carried out according to analysis results. However, few tail gas recovery devices and products for online analysis are available in the market at present, and most of tail gas is finally discharged into the atmosphere, so that environmental pollution is caused.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the tail gas purification method and the tail gas purification device for on-line analysis are provided, which can effectively solve the problem of emission pollution of the existing sampled tail gas and increase economic benefits.
The technical scheme of the invention is realized as follows: a tail gas purification method for on-line analysis is characterized by comprising the following steps: extracting tail gas from a tail gas source to a tail gas loop, condensing the tail gas through a heat exchanger and carrying out gas-liquid separation through a filter, allowing the separated tail gas to flow into a refrigerant inlet of the heat exchanger as a refrigerant to condense the tail gas which initially flows into the tail gas loop, and finally flowing out of a refrigerant outlet of the heat exchanger and flowing back to the tail gas source, allowing a separated liquid phase to flow into an oil collecting tank through a pipeline, and allowing oil gas volatilized by the oil collecting tank to flow back to an outlet of the tail gas source through the pipeline;
the cold energy of tail gas liquefaction is provided by a refrigerant loop, the refrigerant in the liquid receiver flows in from the refrigerant inlet of the heat exchanger to condense the tail gas, and the refrigerant flowing out from the refrigerant outlet of the heat exchanger flows into the liquid receiver for storing and regulating liquid refrigerant in each part of the refrigerating system after separation and condensation treatment, so as to form a circulating loop.
The invention relates to a tail gas purification method for on-line analysis, which comprises the steps that firstly, tail gas flows through an inner pipe of a first-stage heat exchanger to carry out primary condensation, gas-liquid two-phase tail gas discharged from an outlet of the inner pipe of the first-stage heat exchanger is subjected to gas-liquid separation through a first-stage filter, the separated tail gas flows out from a gas outlet of the first-stage filter and then flows into an inner pipe of a second-stage heat exchanger through a pipeline, the tail gas is subjected to secondary condensation in the second-stage heat exchanger, the condensed gas-liquid two-phase tail gas flows into a second-stage filter to carry out gas-liquid separation after coming out from an outlet of the inner pipe of the second-stage heat exchanger, and the separated tail gas flows into a refrigerant inlet of the first-stage heat exchanger to be used as a refrigerant to carry out primary condensation on the tail gas initially entering a tail gas loop.
The invention relates to a tail gas purification method for on-line analysis, which is characterized in that a refrigerant from a refrigerant loop flows in from a refrigerant inlet of a second-stage heat exchanger, oil gas is secondarily condensed in the second-stage heat exchanger, and the condensed refrigerant flows out from a refrigerant outlet of the second-stage heat exchanger, and flows into a liquid reservoir after gas-liquid separation, oil separation and air cooling treatment.
In the tail gas purification method for on-line analysis, in a tail gas loop, tail gas of a tail gas source is pumped into a first-stage heat exchanger through an explosion-proof vacuum pump, and oil gas volatilized by an oil collecting tank returns to the inlet of the explosion-proof vacuum pump through a pipeline.
In the tail gas purification method for on-line analysis, in a refrigerant loop, refrigerant after gas-liquid separation is compressed and pressurized by an explosion-proof compressor and then flows into an oil separator, the refrigerant after oil separation flows into an air-cooled condenser for condensation, and the condensed refrigerant flows into a liquid receiver.
In the tail gas purification method for on-line analysis, in a refrigerant loop, refrigerant flowing out of a liquid receiver sequentially passes through a drying filter and a thermal expansion valve for treatment, and then flows into a refrigerant inlet of a second-stage heat exchanger.
The utility model provides a tail gas cleanup unit for on-line analysis which characterized in that: comprises a tail gas loop unit and a refrigerant loop unit;
the tail gas loop unit comprises an explosion-proof vacuum pump connected with the outlet end of the tail gas source and a heat exchange condensation assembly consisting of a heat exchanger and a filter, wherein a refrigerant inlet of the heat exchanger is connected with a refrigerant loop unit and is used for condensing the tail gas, the filter is used for carrying out gas-liquid separation on the tail gas, a gas outlet of the filter is connected with the inlet end of the tail gas source through the heat exchanger, a liquid outlet of the filter is connected with an oil collecting tank through a pipeline, and a top exhaust port of the oil collecting tank is connected with the inlet end of the explosion-proof vacuum pump through a pipeline;
the refrigerant loop unit comprises an explosion-proof compressor connected with a refrigerant outlet of a heat exchanger in the tail gas loop unit and a liquid storage device used for storing refrigerant, wherein an outlet end of the explosion-proof compressor is connected with an air-cooled condenser, the air-cooled condenser is connected with the liquid storage device through a pipeline, and the liquid storage device is connected with a refrigerant inlet of the heat exchanger through a pipeline.
The tail gas purification device for on-line analysis comprises a heat exchange condensation component, a first-stage heat exchanger, a first-stage filter, a second-stage heat exchanger and a second-stage filter, wherein the heat exchange condensation component comprises the first-stage heat exchanger, the first-stage filter, the second-stage heat exchanger and the second-stage filter which are sequentially connected, the outlet end of an explosion-proof vacuum pump is connected with the first-stage heat exchanger, the gas outlet of the second-stage filter is connected with the refrigerant inlet of the first-stage heat exchanger through a pipeline, the refrigerant outlet of the first-stage heat exchanger is connected with a tail gas source through a pipeline, and the liquid phase outlets at the bottoms of the first-stage filter and the second-stage filter are respectively connected with an oil collecting tank through pipelines.
According to the tail gas purification device for on-line analysis, the lower end liquid outlets of the first-stage filter and the second-stage filter are connected to the oil collecting tank through pipelines, and the oil collecting tank is fixedly arranged on the weighing sensor through the connecting piece.
The tail gas purification device for on-line analysis is characterized in that a gas-liquid separator is arranged at the upstream of an explosion-proof compressor, the gas-liquid separator is connected with a refrigerant outlet of a second-stage heat exchanger, an oil separator is arranged at the downstream of the explosion-proof compressor, the downstream of the oil separator is communicated with an air-cooled condenser, and a liquid reservoir is connected with a refrigerant inlet of the second-stage heat exchanger through a pipeline which is sequentially provided with a drying filter and a thermal expansion valve.
The invention mainly aims at the tail gas for on-line analysis, realizes internal circulation of tail gas condensation and recovery by forming a closed-loop tail gas loop and a refrigerant loop in the device, has no emission, can perform emission protection of VOCS, NMHC and other gases, reduces the pollution to the environment, increases the economic benefit, and can be widely applied to industries of petroleum, chemical industry, chemical fertilizer, electric power, metallurgy and the like.
Drawings
FIG. 1 is a process flow diagram of the method for on-line analysis of tail gas purification according to the present invention.
Fig. 2 is a schematic structural view of an on-line analysis exhaust gas purification apparatus according to the present invention.
The labels in the figure are: the system comprises an exhaust gas loop unit 1, a refrigerant loop unit 2, an exhaust gas source 4, an explosion-proof vacuum pump 101, a first-stage heat exchanger 102, a first-stage filter 103, a second-stage heat exchanger 104, a second-stage filter 105, a weighing sensor 106, an oil collecting tank 107, an explosion-proof compressor 201, an oil separator 202, an air-cooled condenser 203, a liquid reservoir 204, a drying filter 205, a thermal expansion valve 206, a gas-liquid separator 207, a mounting plate 301, a vacuum pump bracket 302, a compressor bracket 303, an oil separator bracket 304, a liquid reservoir bracket 305, a gas-liquid separator bracket 306, a heat exchanger bracket 307, a weighing sensor bracket 308, an air-cooled condenser bracket 309 and a wire bundling plate 310.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the indication of the orientation or the positional relationship is based on the orientation or the positional relationship shown in the drawings, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, or the orientation or the positional relationship which is usually understood by those skilled in the art, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, cannot be understood as limiting the present invention. Furthermore, the terms "first" and "second" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be further noted that the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood as specific cases to those of ordinary skill in the art; the drawings in the embodiments are used for clearly and completely describing the technical scheme in the embodiments of the invention, and obviously, the described embodiments are a part of the embodiments of the invention, but not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
As shown in fig. 1, a method for purifying tail gas for on-line analysis includes pumping tail gas from a tail gas source 4 to a tail gas loop, condensing the tail gas through a heat exchanger and performing gas-liquid separation through a filter, specifically, pumping the tail gas from the tail gas source 4 into a first-stage heat exchanger 102 through an explosion-proof vacuum pump 101, primarily condensing the tail gas through an inner tube of the first-stage heat exchanger 102, performing gas-liquid separation on the gas-liquid two-phase tail gas from an outlet of the inner tube of the first-stage heat exchanger 102 through a first-stage filter 103, flowing the separated tail gas out of a gas outlet of the first-stage filter 103 and then into an inner tube of a second-stage heat exchanger 104 through a pipeline, secondarily condensing the tail gas in the second-stage heat exchanger 104, flowing the condensed gas-liquid two-phase tail gas into a second-stage filter 105 for gas-liquid separation, flowing the separated tail gas into a refrigerant inlet of the first-stage heat exchanger 102 as a refrigerant, primarily condensing the tail gas flowing out of the first-stage heat exchanger 102 through a refrigerant outlet of the first-stage heat exchanger 102 and flowing back to an oil-gas collecting tank 107 through an oil-gas collecting tank 101 where the oil-evaporating tank.
Specifically, heat exchanger adopts coaxial double-pipe heat exchanger in this scheme, compares plate heat exchanger or shell and tube heat exchanger that use among the prior art, and its heat transfer procedure is long, and the heat transfer effect is better, in addition, adopts the filter to carry out gas-liquid separation in this scheme, and it is compared and is advanced higher than the container and carry out gas-liquid separation in the low of using among the present sample gas analytical equipment, can make gas-liquid separation more thorough.
The cold energy of the tail gas liquefaction is provided by a refrigerant loop, the refrigerant in the liquid reservoir 204 from the refrigerant loop flows in from the refrigerant inlet of the second-stage heat exchanger 104, the oil gas is secondarily condensed in the second-stage heat exchanger 104, the condensed refrigerant flows out from the refrigerant outlet of the second-stage heat exchanger 104, and flows into the liquid reservoirs 204 for storing and regulating liquid refrigerants of all parts in the refrigerating system after gas-liquid separation, oil separation and air cooling treatment in sequence, so as to form a circulating loop. Specifically, the refrigerant subjected to gas-liquid separation is compressed and pressurized by the explosion-proof compressor 201, and then flows into the oil separator 202, the refrigerant subjected to oil separation enters the air-cooled condenser 203 to be condensed, the condensed refrigerant flows into the liquid receiver 204, and the refrigerant flowing out of the liquid receiver 204 passes through the drying filter 205 and the thermal expansion valve 206 in this order and then flows into the refrigerant inlet of the second-stage heat exchanger 104.
As shown in fig. 2, a tail gas purification device for online analysis includes a tail gas loop unit 1 and a refrigerant loop unit 2, where the tail gas loop unit is mainly used to extract gas from a tail gas source, condense, liquefy and filter toxic and harmful gas in tail gas twice, separate and liquefy the toxic and harmful gas, and collect the separated and liquefied toxic and harmful gas, and part of the non-liquefied gas is discharged back to the tail gas source again; the refrigerant loop unit mainly has the function of providing the cold energy for liquefying the tail gas.
Specifically, the tail gas loop unit 1 comprises an explosion-proof vacuum pump 101 connected with an outlet end of the tail gas source 4 and a heat exchange condensation assembly composed of a heat exchanger and a filter, wherein a refrigerant inlet of the heat exchanger is connected with the refrigerant loop unit 2 and used for carrying out condensation treatment on tail gas, the filter is used for carrying out gas-liquid separation on the tail gas, a gas outlet of the filter is connected with an inlet end of the tail gas source 4 through the heat exchanger, a liquid outlet of the filter is connected with an oil collecting tank 107 through a pipeline, and a top exhaust port of the oil collecting tank 107 is connected with the inlet end of the explosion-proof vacuum pump 101 through a pipeline.
In this embodiment, the heat exchange condensation component includes a first-stage heat exchanger 102, a first-stage filter 103, a second-stage heat exchanger 104 and a second-stage filter 105 which are connected in sequence, the outlet end of the explosion-proof vacuum pump 101 is connected with the first-stage heat exchanger 102, the gas outlet of the second-stage filter 105 is connected with the refrigerant inlet of the first-stage heat exchanger 102 through a pipeline, the refrigerant outlet of the first-stage heat exchanger 102 is connected with the tail gas source 4 through a pipeline, the bottom liquid phase outlets of the first-stage filter 103 and the second-stage filter 105 are respectively connected with an oil collecting tank 107 through pipelines, a weighing sensor 106 is installed at the upper end of the oil collecting tank 107, and the process requirement for replacing the oil collecting tank can be accurately judged through the weighing sensor, so that the problem that whether the oil collecting tank needs to be replaced or not by adopting a liquid level meter in the prior art is effectively solved, but the problem that the liquid level sensor is inaccurate in the oil collecting tank due to reasons of liquid level fluctuation, gas-liquid phase and the like.
Specifically, the refrigerant circuit unit 2 includes an explosion-proof compressor 201 connected to a refrigerant outlet of the heat exchanger in the tail gas circuit unit 1, and a liquid reservoir 204 for storing refrigerant, a gas-liquid separator 207 is disposed upstream of the explosion-proof compressor 201, the gas-liquid separator 207 is connected to a refrigerant outlet of the second-stage heat exchanger 104, an oil separator 202 is disposed downstream of the explosion-proof compressor 201, a wind-cooled condenser 203 is communicated downstream of the oil separator 202, the wind-cooled condenser 203 is connected to the liquid reservoir 204 through a pipeline, and the liquid reservoir 204 is connected to a refrigerant inlet of the second-stage heat exchanger 104 through a pipeline in which a dry filter 205 and a thermal expansion valve 206 are sequentially disposed.
Each part of the tail gas loop unit 1 and the refrigerant loop unit 2 is arranged on a bracket assembly, and the bracket assembly comprises a mounting plate 301, a vacuum pump bracket 302, a compressor bracket 303, an oil separator bracket 304, a liquid reservoir bracket 305, a gas-liquid separator bracket 306, a heat exchanger bracket 307, a weighing sensor bracket 308, an air-cooled condenser bracket 309 and a wire bundling plate 310; the mounting plate is mounted on the wall surface; the wiring board is arranged at the leftmost side of the mounting plate; the vacuum pump bracket and the compressor bracket are arranged at the bottom of the mounting plate; the oil separator bracket, the liquid reservoir bracket and the gas-liquid separator bracket are arranged on the mounting plate side by side and are positioned above the compressor bracket; the air-cooled condenser bracket is arranged at the uppermost part of the mounting plate; the heat exchanger bracket is arranged on the mounting plate and is positioned on the right side below the air-cooled condenser bracket; the weighing sensor support is arranged in the middle of the mounting plate and is close to the wiring board. Through the modular design, the best configuration of condensing, purifying and recycling toxic and harmful gases is realized by fully utilizing the limited space, and the device has continuous and stable performance; meanwhile, the device has the advantages of compact structure, small occupied space, simplicity in installation, convenience in maintenance and the like, and can be installed in places with narrow space.
The tool flow of this embodiment specifically includes:
after starting the equipment, the explosion-proof vacuum pump 101 starts to work, and tail gas is extracted from a tail gas source to a tail gas loop; the tail gas firstly flows through an inner pipe of the first-stage heat exchanger 102 to be primarily condensed, gas-liquid two-phase tail gas from an outlet of the inner pipe of the first-stage heat exchanger 102 is separated after passing through the first-stage filter 103, and the tail gas flows out from a gas outlet of the first-stage filter 103; then flows into the inner pipe of the second-stage heat exchanger 104 through a pipeline, most of the tail gas is liquefied into liquid after the tail gas is subjected to secondary condensation in the second-stage heat exchanger 104, and the gas-liquid two-phase tail gas flows into a second-stage filter 105 for gas-liquid separation after coming out from the outlet of the inner pipe of the second-stage heat exchanger 104; the separated tail gas continuously flows into a refrigerant inlet of the first-stage heat exchanger 102 from a gas outlet of the second-stage filter 105 through a pipeline, is used as a refrigerant to carry out primary condensation on the tail gas which enters the primary tail gas loop, finally flows out from a refrigerant outlet of the first-stage heat exchanger 102, and finally flows back to a tail gas source.
The liquefied tail gas separated by the first-stage filter 103 and the second-stage filter 105 is temporarily stored in a storage cup of the filter, and automatically flows out from a liquid outlet below the filter after being stored to a certain amount, and flows into an oil collecting tank 107 through a pipeline; the liquefied tail gas in the oil collecting tank 107 is volatilized a little, and the volatilized oil gas returns to the inlet of the explosion-proof vacuum pump 101 through a pipeline.
When the explosion-proof vacuum pump 101 works, the explosion-proof compressor 201 also starts to work, and the explosion-proof compressor 201 extracts a refrigerant from an inlet pipeline, and the refrigerant flows out from an outlet after being compressed and pressurized and flows into the oil separator 202; the oil separator 202 separates oil in the refrigerant to ensure that the refrigerant can flow into the air-cooled condenser 203 in a pure manner, and the separated oil is sent back to the explosion-proof compressor 201; in the internal pipeline of the air-cooled condenser 203, the refrigerant exchanges heat with air, and the heat in the refrigerant is taken away by the air; the condensed refrigerant flows out of the outlet of the air-cooled condenser 203 and flows into a liquid receiver 204 for storing and regulating liquid refrigerant of each part in the refrigerating system through pipelines; then, after sequentially flowing through the dry filter 205 and the thermostatic expansion valve 206, the refrigerant flows in from the refrigerant inlet of the second-stage heat exchanger 104, and the purpose of the refrigerant is to control the flow rate of the refrigerant and prevent the refrigerant pipeline from containing moisture; in the second-stage heat exchanger 104, after the refrigerant condenses the oil gas for the second time, the refrigerant flows out from a refrigerant outlet of the second-stage heat exchanger 104 and flows into the gas-liquid separator 207 through a pipeline to perform gas-liquid separation; finally, the refrigerant flows into the explosion-proof compressor 201 again to form a cycle.
The weighing sensor 106 displays the mass of the condensed liquid tail gas in the oil collecting tank 107, and whether the empty oil collecting tank 107 needs to be replaced by the full oil collecting tank 107 can be judged according to the data displayed by the weighing sensor 106.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A method for purifying tail gas for on-line analysis is characterized in that: extracting tail gas from a tail gas source to a tail gas loop, wherein the tail gas flows through an inner tube of a first-stage heat exchanger for primary condensation, gas-liquid two-phase tail gas from an outlet of the inner tube of the first-stage heat exchanger is subjected to gas-liquid separation through a first-stage filter, the separated tail gas flows out from a gas outlet of the first-stage filter and then flows into an inner tube of a second-stage heat exchanger through a pipeline, the tail gas is subjected to secondary condensation in the second-stage heat exchanger, the condensed gas-liquid two-phase tail gas flows out from an outlet of the inner tube of the second-stage heat exchanger and then flows into the second-stage filter for gas-liquid separation, the separated tail gas flows into a refrigerant inlet of the first-stage heat exchanger as a refrigerant to carry out primary condensation on the tail gas which initially enters the tail gas loop, and finally flows out from a refrigerant outlet of the first-stage heat exchanger and directly flows back to a tail gas source, a liquid phase separated by the first-stage filter and the second-stage filter flows into an oil collecting tank through a pipeline, and oil gas volatilized by the pipeline flows back to the outlet of the tail gas source;
the cold energy of the tail gas liquefaction is provided by a refrigerant loop, the refrigerant in the liquid reservoir flows in from the refrigerant inlet of the second-stage heat exchanger, the oil gas is secondarily condensed in the second-stage heat exchanger, and the refrigerant flowing out from the refrigerant outlet of the second-stage heat exchanger sequentially undergoes gas-liquid separation, oil separation and air cooling treatment and then flows into the liquid reservoirs for storing and regulating the liquid refrigerants of all parts in the refrigerating system to form a circulating loop;
in the tail gas loop, tail gas of a tail gas source is pumped into the first-stage heat exchanger through the explosion-proof vacuum pump, and oil gas volatilized by the oil collecting tank returns to the inlet of the explosion-proof vacuum pump through a pipeline.
2. The method for purifying exhaust gas for on-line analysis according to claim 1, characterized in that: in the refrigerant circuit, the refrigerant after gas-liquid separation is compressed and pressurized by the explosion-proof compressor and flows into the oil separator, the refrigerant after oil separation flows into the air-cooled condenser for condensation, and the condensed refrigerant flows into the liquid receiver.
3. The method for purifying exhaust gas for on-line analysis according to claim 2, characterized in that: in the refrigerant circuit, the refrigerant flowing out of the receiver is sequentially processed by the filter drier and the thermostatic expansion valve, and then flows into the second-stage heat exchanger through the refrigerant inlet.
4. The utility model provides an exhaust gas purification device for on-line analysis which characterized in that: comprises a tail gas loop unit (1) and a refrigerant loop unit (2);
the tail gas loop unit (1) comprises an explosion-proof vacuum pump (101) connected with the outlet end of the tail gas source (4) and a heat exchange condensation assembly consisting of a heat exchanger and a filter;
the heat exchange condensation component comprises a first-stage heat exchanger (102), a first-stage filter (103), a second-stage heat exchanger (104) and a second-stage filter (105), the refrigerant inlet of the second-stage heat exchanger (104) is connected with a refrigerant loop unit (2) and is used for condensing tail gas, the first-stage filter (103) and the second-stage filter (105) are used for carrying out gas-liquid separation on the tail gas, the outlet end of the explosion-proof vacuum pump (101) is connected with the first-stage heat exchanger (102), the gas outlet of the second-stage filter (105) is connected with the refrigerant inlet of the first-stage heat exchanger (102) through a pipeline, the refrigerant outlet of the first-stage heat exchanger (102) is connected with a tail gas source (4) through a pipeline, the bottom liquid phase outlets of the first-stage filter (103) and the second-stage filter (105) are respectively connected with an oil collection tank (107) through pipelines, and the top exhaust port of the oil collection tank (107) is connected with the explosion-proof inlet end (101) through a pipeline;
the refrigerant loop unit (2) comprises an explosion-proof compressor (201) connected with a refrigerant outlet of the second-stage heat exchanger (104) in the tail gas loop unit (1) and a liquid reservoir (204) used for storing refrigerant, an outlet end of the explosion-proof compressor (201) is connected with an air-cooled condenser (203), the air-cooled condenser (203) is connected with the liquid reservoir (204) through a pipeline, and the liquid reservoir (204) is connected with a refrigerant inlet of the second-stage heat exchanger (104) through a pipeline.
5. The exhaust gas purification apparatus for on-line analysis according to claim 4, wherein: the lower end liquid outlets of the first-stage filter (103) and the second-stage filter (105) are connected to an oil collecting tank (107) through pipelines, and the oil collecting tank (107) is fixedly mounted on a weighing sensor (106) through a connecting piece.
6. The exhaust gas purification apparatus for on-line analysis according to claim 4, wherein: the explosion-proof compressor is characterized in that a gas-liquid separator (207) is arranged on the upstream of the explosion-proof compressor (201), the gas-liquid separator (207) is connected with a refrigerant outlet of the second-stage heat exchanger (104), an oil separator (202) is arranged on the downstream of the explosion-proof compressor (201), the downstream of the oil separator (202) is communicated with an air-cooled condenser (203), and a liquid reservoir (204) is connected with a refrigerant inlet of the second-stage heat exchanger (104) through a pipeline which is sequentially provided with a drying filter (205) and a thermal expansion valve (206).
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| CN202295966U (en) * | 2011-10-17 | 2012-07-04 | 中国石油化工股份有限公司 | Oil gas recovery device |
| CN106039915A (en) * | 2016-07-20 | 2016-10-26 | 谢玉勋 | Oil and gas recovery device and recovery method thereof |
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| WO1994011623A2 (en) * | 1992-11-19 | 1994-05-26 | Engelhard Corporation | Method and apparatus for treating an engine exhaust gas stream |
| JP2003093825A (en) * | 2001-09-27 | 2003-04-02 | Ebara Corp | Gas removing method and gas removing filter |
| JP2008279376A (en) * | 2007-05-11 | 2008-11-20 | Orion Mach Co Ltd | Voc cooling/recovery device |
| CN105536282B (en) * | 2016-02-01 | 2017-09-15 | 东南大学 | A kind of oil-gas recovery method for being pressurized multi-stage condensing |
| CN111644015B (en) * | 2020-06-19 | 2022-05-20 | 北京势蓝科技有限公司 | Oil gas recovery system for realizing nitrogen multiplexing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202295966U (en) * | 2011-10-17 | 2012-07-04 | 中国石油化工股份有限公司 | Oil gas recovery device |
| CN106039915A (en) * | 2016-07-20 | 2016-10-26 | 谢玉勋 | Oil and gas recovery device and recovery method thereof |
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