CN112265971A - Method for quickly and mechanically deoxidizing and enriching nitrogen between closed bins - Google Patents

Method for quickly and mechanically deoxidizing and enriching nitrogen between closed bins Download PDF

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CN112265971A
CN112265971A CN202011213097.6A CN202011213097A CN112265971A CN 112265971 A CN112265971 A CN 112265971A CN 202011213097 A CN202011213097 A CN 202011213097A CN 112265971 A CN112265971 A CN 112265971A
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nitrogen
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deoxidation
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CN112265971B (en
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来振利
李翊玮
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Wuhan Dongchang Warehousing Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00—Nitrogen; Compounds thereof
    • C01B21/04—Purification or separation of nitrogen
    • C01B21/0405—Purification or separation processes
    • C01B21/0433—Physical processing only
    • C01B21/045—Physical processing only by adsorption in solids
    • C01B21/0455—Physical processing only by adsorption in solids characterised by the adsorbent
    • C01B21/0461—Carbon based materials
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00—Nitrogen; Compounds thereof
    • C01B21/04—Purification or separation of nitrogen
    • C01B21/0405—Purification or separation processes
    • C01B21/0433—Physical processing only
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00—Nitrogen; Compounds thereof
    • C01B21/04—Purification or separation of nitrogen
    • C01B21/0405—Purification or separation processes
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    • C01B21/0438—Physical processing only by making use of membranes

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Abstract

The invention belongs to the technical field of agricultural product storage and airtight space pest mechanical deoxidation nitrogen-rich air-conditioning control, and discloses a method for quickly and mechanically deoxidizing nitrogen-rich in an airtight cabin, which is characterized by comprising the following steps: a system air pressure balancing device is connected into a closed circulating deoxygenation and nitrogen-charging system formed by mutually butt-joint and communication of exhaust pipelines, deoxygenation and nitrogen-rich equipment and input air pipelines among closed bins, the system air pressure balancing device comprises a nitrogen-rich gas source, a nitrogen-rich gas source control valve and a nitrogen-rich gas source output pipeline, the system air pressure balancing device is connected into the circulating deoxygenation and nitrogen-charging system through the nitrogen-rich gas source output pipeline, the system air pressure balancing device and the circulating deoxygenation and nitrogen-charging system are jointly constructed to complete a rapid mechanical deoxygenation and nitrogen-rich system, the deoxygenation and nitrogen-rich equipment in the circulating deoxygenation and nitrogen-charging system is started to extract air from the closed bins, and enriched high-concentration nitrogen is separated and sent into the closed bins. The invention has the characteristics of improving the operating efficiency of the deoxidation nitrogen-rich air conditioning equipment and reducing the energy consumption.

Description

Method for quickly and mechanically deoxidizing and enriching nitrogen between closed bins
Technical Field
The invention belongs to the technical field of agricultural product storage and airtight space pest mechanical deoxidation nitrogen-rich air-conditioning control, and particularly relates to a method for quickly and mechanically deoxidizing nitrogen-rich in an airtight cabin.
Background
The agricultural products are extremely easy to be infected and damaged by harmful organisms in the processes of storage and processing; high-speed rails, ships and airplanes are frequently born everyday, and are also easy to be infected and propagated by pests in the logistics process. In consideration of food safety and environmental safety and management and control requirements, a safe and environment-friendly mechanical deoxidation nitrogen-rich air-conditioned insect prevention technology becomes a first choice for pest control of agricultural product storage cabins and closed spaces.
The basic principle of the mechanical deoxidation nitrogen-rich air-conditioning insect prevention technology is as follows: the mechanical deoxidation nitrogen-rich equipment is used for removing oxygen in air, enriching nitrogen in the air, and high-purity nitrogen enriched in the air is filled into a closed cabin or a closed space for breeding pests through an input air pipeline between the closed cabins, so that a continuous low-oxygen closed environment with the oxygen volume concentration below 5% is created, the breeding and breeding of pests can be effectively inhibited, and when the oxygen volume concentration reaches below 2%, the pests die by suffocation, and the purpose of preventing and controlling the pests is achieved.
At present, the devices for performing air-conditioning insect prevention by deoxidizing and enriching nitrogen through nitrogen-oxygen separation in the market mainly have three types: carbon molecular sieve deoxidation nitrogen making equipment, zeolite molecular sieve deoxidation nitrogen making equipment and membrane separation deoxidation nitrogen making equipment. The above three types can be divided into two types from pressure: one is a high pressure nitrogen generation type, and the other is a normal pressure nitrogen generation type. The high-pressure nitrogen production type comprises: a PSA carbon molecular sieve nitrogen generator (hereinafter referred to as PSA nitrogen generator), a high-pressure membrane separation nitrogen generator (hereinafter referred to as high-pressure membrane nitrogen generator), and a PSA zeolite molecular sieve oxygen generator (hereinafter referred to as PSA oxygen generator); the normal pressure nitrogen making type comprises: a VPSA carbon molecular sieve deoxygenator (hereinafter referred to as VPSA deoxygenator), a VPSA zeolite molecular sieve oxygen generator (hereinafter referred to as VPSA oxygen generator), and a normal pressure type membrane separation nitrogen generator (hereinafter referred to as normal pressure membrane nitrogen generator).
(1) PSA nitrogen generator. The selective adsorption characteristic of the carbon molecular sieve to nitrogen and oxygen and the difference of adsorption capacity under different pressure conditions are utilized to separate oxygen and nitrogen, and the modes of pressure adsorption and decompression analysis are adopted to remove oxygen to prepare nitrogen-rich gas. Generally comprises an air compressor, a refrigeration dryer, an air filter, a dryer, an air buffer tank, a pressure swing adsorption tower set, a nitrogen buffer tank and the like. The basic process flow comprises the following steps: air is compressed by an air compressor, then enters an air buffer tank after dust removal, oil removal and drying, and then enters a pressure swing adsorption tower through an air inlet valve, the pressure of the tower rises, oxygen molecules in the compressed air are adsorbed by a carbon molecular sieve, and nitrogen-rich gas which is not adsorbed passes through an adsorption bed and enters a nitrogen storage tank through an air outlet valve. Pressure swing adsorption processes typically employ two columns in parallel, alternately undergoing pressure adsorption and desorption regeneration to obtain a continuous nitrogen-rich stream.
(2) VPSA deoxygenator. The selective adsorption characteristic of the carbon molecular sieve to nitrogen and oxygen and the difference of adsorption capacity under different pressure conditions are utilized to separate oxygen and nitrogen, and the method is different from a PSA carbon molecular sieve nitrogen making machine in that the method adopts the modes of normal pressure adsorption and vacuum desorption to separate oxygen and nitrogen. Generally comprises a fan, a carbon molecular sieve adsorption tower group, a vacuum pump, a control valve, a pneumatic source and the like. The basic process flow comprises the following steps: the air in the closed cabin is extracted by a fan and enters a pressure swing adsorption tower through an air inlet valve, oxygen molecules in the air are adsorbed by a carbon molecular sieve and then are desorbed and evacuated by vacuum, and nitrogen gas which is not adsorbed passes through an adsorption bed to be enriched at the top of the adsorption tower and is returned to the closed cabin through an air outlet valve. The oxygen remover usually uses two columns in parallel to alternately perform normal pressure adsorption and vacuum desorption regeneration, thereby obtaining continuous nitrogen-rich air flow.
(3) High-pressure type membrane nitrogen generator. Oxygen and nitrogen are deoxidized and enriched by utilizing the difference of permeation and diffusion rates of oxygen and nitrogen in the air separation membrane. Consists of a compressor, a refrigeration dryer, a filter, an air buffer tank, a heater, a hollow fiber membrane, a pipe and a valve. The basic process flow comprises the following steps: after compressed air enters a membrane separator through compression, drying, filtration and heating, water vapor, carbon dioxide and oxygen in the air rapidly permeate through the membrane wall to enter the other side of the membrane for enrichment and evacuation; the nitrogen penetrates through the membrane wall at a relatively slow speed and is enriched in the membrane, and the enriched nitrogen is used as product gas to be conveyed to application and use places such as a closed cabin and the like.
The difference between the high-pressure membrane nitrogen making machine and the oxygen generator lies in the positioning of target product gas, when the nitrogen is positioned as the product gas, the nitrogen making machine can be regarded as the nitrogen making machine, and when the oxygen is positioned as the product gas, the nitrogen making machine can be regarded as the oxygen generator.
(4) A normal pressure type film nitrogen making machine. Oxygen and nitrogen are deoxidized and enriched by utilizing the difference of permeation and diffusion rates of oxygen and nitrogen in the air separation membrane. Generally comprises a fan, a dryer, a filter, a hollow fiber membrane and a vacuum pump. The basic process flow comprises the following steps: after air in the closed bin is extracted by a fan, dried and filtered and enters a membrane separator, water vapor, carbon dioxide and oxygen in the air rapidly permeate through the membrane wall under the negative pressure action of a vacuum pump and enter the other side of the membrane to be enriched, removed and evacuated; the nitrogen penetrates through the membrane wall at a relatively slow speed and is enriched in the membrane, and the enriched nitrogen is used as product gas to be conveyed to application and use places such as a closed cabin and the like.
The difference between the normal pressure type membrane nitrogen making machine and the oxygen generator is in the positioning of target product gas, when the nitrogen is positioned as the product gas, the nitrogen making machine can be regarded as the nitrogen making machine, when the oxygen is positioned as the product gas, the nitrogen making machine can be regarded as the oxygen generator, and the deoxidation and nitrogen enrichment equipment capable of realizing nitrogen and oxygen separation in the scheme can be used as the nitrogen making machine.
(5) PSA oxygenerator. The selective adsorption characteristic of zeolite molecular sieve to nitrogen and oxygen and the difference of adsorption capacity under different pressure conditions are utilized to separate oxygen and nitrogen, and the nitrogen-enriched gas is prepared by removing oxygen by adopting the modes of pressure adsorption and decompression analysis. Generally comprises an air compressor, a refrigeration dryer, an air filter, a dryer, an air buffer tank, a pressure swing adsorption tower set, a nitrogen buffer tank and the like. The basic process flow comprises the following steps: air is compressed by an air compressor, then enters an air buffer tank after dust removal, oil removal and drying, the pressurized, dried and filtered clean air enters a pressure swing adsorption tower through an air inlet valve, the tower pressure rises, nitrogen molecules and carbon dioxide in the compressed air are adsorbed by a zeolite molecular sieve, nitrogen-rich gas generated when the compressed air is saturated in adsorption and naturally depressurized and analyzed is discharged through an air outlet valve at the lower part of the adsorption tower, and unadsorbed oxygen passes through an adsorption bed and is discharged through an air outlet valve at the upper part of the adsorption tower. The pressure swing adsorption method generally uses two columns connected in parallel to alternately perform pressure adsorption and desorption regeneration to realize separation of oxygen and nitrogen, thereby obtaining continuous high-concentration oxygen and nitrogen-rich gas mixed with carbon dioxide gas.
The volume concentration of nitrogen in the tail gas of the PSA oxygen generator is generally more than 85%, and the nitrogen concentration can reach more than 95% by adopting a circulating deoxidation and nitrogen enrichment process method. In practical application, as the agricultural products are subjected to biological metabolism during storage, oxygen is continuously consumed and carbon dioxide gas is released, carbon dioxide with a certain concentration is often mixed in the nitrogen-rich tail gas of the PSA oxygen generator and is used as product gas for gas-conditioning insect prevention, so that the product gas has a better effect, has a better prospect in energy conservation and emission reduction, and can be used as oxygen-reduction, nitrogen-enrichment and gas-conditioning equipment for application.
(6) VPSA oxygen plants. The selective adsorption characteristic of zeolite molecular sieve to nitrogen and oxygen and the difference of adsorption capacity under different pressure conditions are used to separate oxygen and nitrogen, and the difference is different from PSA oxygen generator in that the mode of normal pressure adsorption and vacuum desorption is used to separate oxygen and nitrogen. Generally comprises a normal pressure fan, a carbon molecular sieve adsorption tower group, a vacuum pump, a control valve, a pneumatic source and the like. The basic process flow comprises the following steps: air in the closed cabin is extracted by a fan and enters the pressure swing adsorption tower through the air inlet valve, nitrogen molecules and carbon dioxide in the air are adsorbed by the zeolite molecular sieve, nitrogen-rich gas generated during vacuum depressurization and analysis after adsorption saturation is discharged through the air outlet valve at the lower part of the adsorption tower, and unadsorbed oxygen passes through the adsorption bed and is discharged through the air outlet valve at the upper part of the adsorption tower. The pressure swing adsorption method generally uses two columns connected in parallel to alternately perform pressure adsorption and desorption regeneration, thereby obtaining a continuous high-concentration oxygen gas and a nitrogen-rich gas mixed with a carbon dioxide gas. The nitrogen-rich gas mixed with carbon dioxide gas generated by the VPSA oxygen generator can be used as product gas for modified atmosphere insect prevention.
The nitrogen concentration in the tail gas of the VPSA oxygen generator is generally about 85 percent, and the volume concentration of the nitrogen can reach more than 95 percent by adopting a circulating deoxidation and nitrogen enrichment process method. In practical application, as the agricultural products are subjected to biological metabolism during storage, oxygen is continuously consumed and carbon dioxide gas is released, carbon dioxide with a certain concentration is often mixed in the nitrogen-rich tail gas of the PSA oxygen generator and is used as product gas for gas-conditioning insect prevention, so that the product gas has a better effect, has a better prospect in energy conservation and emission reduction, and can be used as oxygen-reduction, nitrogen-enrichment and gas-conditioning equipment for application.
The deoxidation and nitrogen enrichment equipment has different scale applications in pest control in the fields of food, tobacco and the like, but has the following problems:
the high-pressure nitrogen type equipment has high nitrogen purity and stable nitrogen airflow, but has the problems of high power distribution, high unit energy consumption, high control requirement of a pressure container and the like, and the power distribution capacity of a plurality of insect-proof sites cannot meet the requirement and is difficult to meet the requirements of quick deoxidation, nitrogen-rich air-conditioning and insect-proof operation of agricultural products and large-scale closed spaces;
the normal pressure nitrogen-making equipment has the advantages of simple process, low unit energy consumption, no pressure vessel for controlling pressure and the like, but the nitrogen concentration of the product gas is lower, generally less than 95 percent, a closed passage needs to be constructed between the air exhaust pipeline and the air supply pipeline and the closed bin, the nitrogen purity of the output gas is improved by continuously improving the nitrogen concentration of the raw gas in the circulating deoxidation mode, but when oxygen in the closed cabin is removed, in order to maintain the air pressure balance in the closed cabin, a certain amount of air needs to be continuously supplemented from the atmosphere by the deoxidation and nitrogen enrichment equipment, has great diluting effect on the nitrogen concentration of the product gas, and particularly has the problems of low deoxidation efficiency, slow oxygen reduction speed and the like when the nitrogen concentration in the closed bin reaches more than 95 percent, if the oxygen concentration between the bins needs to be removed to be below 2 percent, the operation time of the equipment is multiplied, and the requirements of agricultural products and large-scale closed space rapid deoxidation, nitrogen-rich air-conditioning and insect prevention operation are difficult to meet.
Below at 168m3The closed cabin of the device is used for comparing and explaining the time length and energy consumption of the oxygen and nitrogen regulation and control of the high-pressure nitrogen making device and the normal-pressure nitrogen making device.
The sealed cabin A1 is a six-sided sealed tent (length, width, height) of 14 m, 4 m and 3 m made of a PA/PE five-layer co-extrusion nylon composite film with the thickness of 0.12 mm;
an exhaust pipeline A2 between the closed bins and an input air pipeline A3 between the closed bins are plastic hoses with inner diameters of 50 mm;
the deoxidation and nitrogen enrichment equipment A4 respectively selects a normal-pressure nitrogen making type equipment of Tianjin Jiesheng Donghui science and technology limited-VPSA deoxygenator and a high-pressure nitrogen making type equipment of Jiangsu Sujing group limited-PSA nitrogen making machine for comparison, wherein: the nitrogen volume concentration of the VPSA deoxygenator is 95 percent, and the nitrogen amount is 50N m3The equipment power is 10kw, the volume concentration of nitrogen of the PSA nitrogen making machine is 99 percent, and the nitrogen amount is 50N m3The power of the apparatus is 18 KW. The control results are shown in Table 1.
Table 1: comparison list of regulation and control results of PSA and VPSA carbon molecular sieve pressure swing adsorption deoxygenation nitrogen-rich equipment
Figure BDA0002759437830000041
In table 1, when the oxygen volume concentration is adjusted to 5%, the PSA nitrogen generator is less frequently than the VPSA deoxygenator by 2.5 hours, but the energy consumption of the PSA nitrogen generator is 1.2 times that of the VPSA deoxygenator; when the volume concentration of the oxygen is adjusted to 2%, the PSA nitrogen making machine is less than that of the VPSA deoxygenator for 6 hours, and the energy consumption of the PSA nitrogen making machine is 1.08 times that of the VPSA deoxygenator.
In addition, the comparison result shows that the time for operating the VPSA deoxygenator to reduce the oxygen volume concentration from 5% to 2% is basically equal to the time for operating the VPSA deoxygenator to reduce the oxygen volume concentration from 21% to 5%, and the deoxygenation and nitrogen enrichment efficiency of the VPSA deoxygenator in the low oxygen concentration section is greatly reduced.
The energy consumption of the PSA nitrogen making machine is very large when ten thousand cubes of warehouses are subjected to nitrogen-filling and nitrogen-rich air conditioning operation, the power distribution capacity of many warehouse areas cannot meet the power distribution requirement of PSA equipment, the long regulation and control period of the VPSA deoxygenator has great influence on daily production scheduling, and the application of nitrogen-filling and air conditioning in large-scale warehouses is limited to a certain extent.
For the treatment of harmful organisms in closed places such as high-speed rails, cabins, engine rooms and the like, because more precise instruments cannot adopt chemical prevention and control means, the traditional mechanical nitrogen-filling and gas-conditioning technology is also difficult to implement due to the limitations of power distribution capacity, energy consumption and regulation and control duration.
Disclosure of Invention
The invention aims to solve the problems of high energy consumption and overlong time consumption of the existing mechanical deoxidation and nitrogen-rich air-conditioning control of pests in the storage cabins and the closed spaces of agricultural products.
A system air pressure balancing device is connected into a closed circulating deoxidation and nitrogen charging system formed by mutually butt-joint and communication of exhaust pipelines, deoxidation and nitrogen-rich equipment and input air pipelines among closed bins, the system air pressure balancing device comprises a nitrogen-rich gas source, a nitrogen-rich gas source control valve and a nitrogen-rich gas source output pipeline, the system air pressure balancing device is connected into the circulating deoxidation and nitrogen charging system through the nitrogen-rich gas source output pipeline, the system air pressure balancing device and the circulating deoxidation and nitrogen charging system are jointly constructed to complete a rapid mechanical deoxidation and nitrogen-rich system, the deoxidation and nitrogen-rich equipment in the circulating deoxidation and nitrogen charging system is started to extract air from the closed bins, oxygen in the air is separated and removed and then discharged out of the circulating deoxidation and nitrogen charging system, and the separated and enriched high-concentration nitrogen is sent into the closed bins; and a nitrogen-rich gas source in the system air pressure balancing device is started, and nitrogen-rich gas is filled into the circulating deoxidation and nitrogen-filling system, so that the nitrogen-rich gas is used for compensating the gas flow difference between an exhaust pipeline and an input gas pipeline between the closed bins in the continuous operation process of the circulating deoxidation and nitrogen-filling system and the pressure difference formed inside and outside the system, and ensuring the air pressure balance between the inside and the outside of the closed bins and the mechanical deoxidation and nitrogen-rich efficiency. Has the characteristics of improving the operating efficiency of the deoxidation nitrogen-rich air conditioning equipment and reducing the energy consumption.
In order to achieve the purpose, the invention adopts the technical scheme that the method for quickly and mechanically deoxidizing and enriching nitrogen between the closed bins is characterized in that: the closed circulating deoxygenation and nitrogen-enrichment system comprises a closed cabin A1, an exhaust pipeline A2 between the closed cabins, an input air pipeline A3 between the closed cabins, a deoxygenation and nitrogen-enrichment device A4 and a tail gas exhaust pipeline A43 mainly based on oxygen, wherein the tail gas exhaust pipeline A43 is connected with a tail gas exhaust port of the deoxygenation and nitrogen-enrichment device A4, a deoxygenation and nitrogen-enrichment device air supplement port A44 is arranged on the deoxygenation and nitrogen-enrichment device A4, a deoxygenation and nitrogen-enrichment device air supplement port control valve A45 is arranged at the deoxygenation and nitrogen-enrichment device air supplement port A44, an exhaust pipeline A2 between the closed cabins is connected with a raw material gas inlet A41 of the deoxygenation and nitrogen-enrichment device A4, an input air pipeline A3 between the closed cabins is connected with a nitrogen exhaust port A8 of the deoxygenation and nitrogen-enrichment device, the closed cabin A1, the exhaust pipeline A2 between the closed cabins, the deoxygenation and nitrogen-enrichment device A4, and; the method is characterized in that: a system air pressure balancing device B is connected to the cyclic deoxidation and nitrogen charging system A, the system air pressure balancing device B comprises a nitrogen-rich source B1, a nitrogen-rich source control valve B2 and a nitrogen-rich source output pipeline B3, the nitrogen-rich source control valve B2 is installed on the nitrogen-rich source output pipeline B3, the system air pressure balancing device B is connected to the cyclic deoxidation and nitrogen charging system A through a nitrogen-rich source output pipeline B3 (the nitrogen-rich source output pipeline B3 is communicated with an input air pipeline A3 between closed bins or an exhaust pipeline A2 between the closed bins), and the system air pressure balancing device B and the cyclic deoxidation and nitrogen charging system A jointly construct a rapid mechanical deoxidation and nitrogen-rich system; opening a deoxidation and nitrogen-rich device A4 in the circulation deoxidation and nitrogen-rich system A, extracting air from a sealed cabin A1 through an exhaust pipeline A2 in the sealed cabin, separating and removing oxygen in the air, and then discharging the oxygen from a tail gas discharge pipeline A43 which mainly uses oxygen to the outside of the circulation deoxidation and nitrogen-rich system A, wherein the separated and enriched high-concentration nitrogen is sent to the sealed cabin A1 from a nitrogen gas discharge port A42 of the deoxidation and nitrogen-rich device through an input air pipeline A3 in the sealed cabin; and a nitrogen-rich gas source B1 in the system air pressure balancing device B is started, a nitrogen-rich gas source control valve B2 is opened, and a nitrogen-rich gas source B1 fills nitrogen-rich gas into the circulating deoxygenation and nitrogen-charging system A through the nitrogen-rich gas source control valve B2, an input gas pipeline A3 between closed bins or an exhaust pipeline A2 between the closed bins, so that the nitrogen-rich gas compensation system is used for compensating the gas flow difference between the exhaust pipeline A2 between the closed bins and the input gas pipeline A3 and the pressure difference formed inside and outside the system in the continuous operation process of the circulating deoxygenation and nitrogen-charging system A, and ensuring the air pressure balance inside and outside the closed bin A1 and the mechanical deoxygenation and nitrogen-rich efficiency.
According to the scheme, the nitrogen-rich source B1 of the system air pressure balancing device B uses a PSA nitrogen generator, a VPSA deoxygenator, a PSA oxygen generator, a VPSA oxygen generator, a high-pressure membrane separation nitrogen generator (oxygen generator), a normal-pressure membrane separation nitrogen generator (oxygen generator), a compressed steel bottled nitrogen or nitrogen station, or the nitrogen-rich sources can be combined in series or in parallel.
According to the scheme, the deoxidation and nitrogen enrichment equipment A4 uses any one of a PSA nitrogen generator, a VPSA deoxygenator, a PSA oxygen generator, a VPSA oxygen generator, a high-pressure membrane separation nitrogen generator (oxygen generator) and a normal-pressure membrane separation nitrogen generator (oxygen generator), and can also use the multiple equipment in a series or parallel combination way.
According to the scheme, the system air pressure balancing device B realizes monitoring and balance adjustment control of system flow and air pressure through one of the following three modes:
(1) a gas flow detector 1 is arranged on the nitrogen-rich gas source output pipeline A2, a gas flow detector 2 is arranged on the tail gas discharge pipeline A43, the removal amount of the tail gas mainly containing oxygen and the compensation amount of the nitrogen-rich gas needing compensation are calculated through the detection values of the gas flow detector 1 and the gas flow detector 2, and the gas flow between the exhaust pipeline A2 and the input gas pipeline A3 in the continuous operation process of the circulating deoxygenation and nitrogen-charging system A is balanced by adjusting a nitrogen-rich gas source control valve B2;
(2) a nitrogen-rich gas source output pipeline B3 is provided with a gas flow detector 1, a raw material gas inlet A41 of the deoxidation and nitrogen-rich equipment is provided with a gas flow detector 3, a nitrogen gas outlet A42 of the deoxidation and nitrogen-rich equipment is provided with a gas flow detector 4, the compensation amount of the nitrogen-rich gas to be compensated is calculated through the difference value between the gas flow detector 3 at the raw material gas inlet A41 of the deoxidation and the gas flow detector 4 at the nitrogen gas outlet A42 of the deoxidation and nitrogen-rich equipment, and the gas flow between a sealed cabin exhaust pipeline A2 and an input gas pipeline A3 in the continuous operation process of the circulating deoxidation and nitrogen-filling system A is balanced by adjusting a nitrogen-rich gas source control valve B2;
(3) and a pressure sensor 5 is arranged between the closed bins, and when the pressure sensor 5 detects that the pressure difference exists between the inside and the outside of the closed bins, a nitrogen-rich source control valve B2 is adjusted to ensure that the pressure difference between the inside and the outside of the closed bins tends to be balanced.
According to the technical scheme, the nitrogen volume concentration of a nitrogen-rich gas source B1 in a system air pressure balancing device B is more than 78%, and when the nitrogen volume concentration of a nitrogen-rich gas source B1 is lower than the nitrogen volume concentration in a closed cabin A1, the system air pressure balancing device B is connected to a circulating deoxygenation nitrogen-filling system according to one of the following 2 methods and performs compensation balance:
(1) connecting a nitrogen-rich gas source (or nitrogen-rich gas source device) B1 to a gas supplementing port A44 of a deoxidation and nitrogen-rich device: a bypass pipe B4 is arranged on a nitrogen-rich source output pipeline B3 between a nitrogen-rich source B1 and a nitrogen-rich source control valve B2, the nitrogen-rich source B1 is connected to a gas supplementing opening A44 of the deoxidation and nitrogen-rich device through a bypass pipe B4, when the volume concentration of nitrogen of the nitrogen-rich source B1 is lower than that of nitrogen in a sealed cabin A1, a gas supplementing opening control valve A45 of the deoxidation and nitrogen-rich device is opened, the nitrogen-rich source control valve B2 is closed, nitrogen-rich gas of the nitrogen-rich source B1 is filled into the deoxidation and nitrogen-rich device A4 through the bypass pipe B4, then the nitrogen-rich gas subjected to deoxidation treatment by the deoxidation and nitrogen-rich device A4 is sent into the sealed cabin A1, and nitrogen with lower concentration is prevented from being directly sent into the sealed cabin A1 to reduce the volume concentration of the nitrogen in the sealed;
(2) connecting a nitrogen-rich gas source B1 into an exhaust pipeline A2 between the closed bins: a bypass pipe B5 is arranged on a nitrogen-rich source output pipeline B3 between a nitrogen-rich source B1 and a nitrogen-rich source control valve B2, the bypass control valve B6 is installed on a bypass pipe B5, a nitrogen-rich source B1 is connected to an exhaust pipeline A2 between closed bins through a bypass pipe B5, when the volume concentration of nitrogen of a nitrogen-rich source B1 is lower than that of nitrogen in the closed bin A1, the bypass control valve B6 on the bypass pipe B5 is opened, the nitrogen-rich source control valve B2 is closed at the same time, nitrogen-rich gas of the nitrogen-rich source B1 is filled into the exhaust pipeline A2 between the closed bins through the bypass pipe B5 and then is sent into a deoxygenation and nitrogen-rich device A4 through a raw material gas inlet A41 of the deoxygenation and nitrogen-rich device A4 deoxygenation treatment and then is sent into the closed bin A1, and the nitrogen with lower concentration is prevented from being directly sent into the nitrogen in the sealed bin A1 to reduce the nitrogen concentration in the.
According to the technical scheme, when the volume concentration of the nitrogen in the nitrogen-rich source B1 is greater than or equal to the volume concentration of the nitrogen in the sealed cabin A1, the system air pressure balancing device B can also be directly connected to the sealed cabin A1 through the nitrogen-rich source B1 through the nitrogen-rich source output pipeline B3 to perform compensation and pressure equalization.
The terms and definitions in the above technical solution are as follows:
and (3) deoxidation and nitrogen enrichment equipment: the device is a general name of equipment with the functions of removing oxygen and enriching nitrogen. Comprises a pressure swing adsorption type nitrogen making machine, a membrane separation type nitrogen making machine, a pressure swing adsorption type oxygen making machine and a membrane separation type oxygen making machine. The difference between the nitrogen generator and the oxygen generator lies in the positioning of the target product gas, when the nitrogen-rich gas is positioned as the product gas, the nitrogen generator can be regarded as the nitrogen generator, and when the oxygen is positioned as the product gas, the oxygen generator can be regarded as the oxygen generator.
A nitrogen-rich gas source: the device, facility or container can continuously provide nitrogen concentration higher than that in the atmospheric environment, and comprises various deoxidation and nitrogen-rich devices (including pressure swing adsorption type nitrogen making machine, membrane separation type nitrogen making machine, pressure swing adsorption type oxygen making machine and membrane separation type oxygen making machine) with functions of removing oxygen and enriching nitrogen, compressed nitrogen in bottles, nitrogen station or high-concentration nitrogen in a closed cabin after nitrogen filling and disinsection are completed.
Modified atmosphere insect prevention: the proportion components of oxygen, nitrogen, carbon dioxide and other gases in the closed environment are artificially changed, so that the purpose of forming a controlled atmosphere regulation technology which is not beneficial to the growth activity of pests and inhibiting the pests is achieved;
sealing the cabin: during the period of stacking and storing the agricultural products after being stored in a warehouse, a stacked sealed tent is adopted or the whole storage space is sealed and blocked, so that the sealed isolation from the atmospheric environment is realized, and the controlled atmosphere maintenance is convenient, wherein the sealed space and the sealed warehouse are both referred to as a sealed cabin;
the concept of the closed cabin also comprises a closed space of a high-speed rail carriage, a container, a cabin, an engine room and the like, wherein harmful organisms (various viruses, moulds, flies, cockroaches, mosquitoes, mice and the like) are easy to breed;
air tightness between the bins: the air tightness level of the environment between the closed cabins (or cabins) is expressed, the air tightness between the independent closed cabins can be monitored by using a pressure decay test (Pt test), and the air tightness monitoring is carried out by referring to relevant regulations of national standard GB/T25229-2010 of the people's republic of China, namely grain and oil storage-air tightness requirement of a horizontal warehouse. The air tightness between the closed bins is required to meet the standard of secondary air tightness, the air tightness is insufficient, and the problems are solved by a method of detecting leakage and repairing holes or replacing closed materials.
Pressure difference between the inside and the outside of the closed bin: a closed circulating deoxygenation and nitrogen-rich system is jointly constructed by 'an air exhaust pipeline A1 between closed cabins → an air exhaust pipeline A2 between closed cabins → a deoxygenation and nitrogen production device A4 → an air input pipeline A3 between closed cabins → an air inlet pipeline A1 between closed cabins', and the system can cause the difference of the density of gas inside and outside the system due to oxygen removal after continuous operation, thereby causing the pressure difference inside and outside the system or the dynamic unbalance and balance state of the pressure inside and outside the system.
The equipment target produces the finished gas and the equipment tail gas: in the technical system of the invention, the oxygen generator, the nitrogen generator or the oxygen generator separates the gas extracted into the equipment, the target product gas generated by the equipment operation treatment is the mixed gas of nitrogen and carbon dioxide, the target product gas is input into a closed cabin to play the role of filling nitrogen to control pests, the oxygen generated in the process is discharged into the ambient atmosphere as the tail gas (waste gas) component of the equipment, at the moment, the tail gas exhaust pipes (or tail gas exhaust ports), exhaust ports, exhaust valves and the like of the three types of equipment are transformed into channels capable of discharging oxygen, and transforming the channel for outputting the nitrogen-rich gas of the three types of equipment into an air outlet pipe orifice which can be communicated with a nitrogen-rich gas outlet of the equipment and is butted with the closed circulating mechanical deoxidation and nitrogen charging system.
Compared with the prior art, the invention has the advantages that:
1) the system air pressure balancing device is innovatively provided, the nitrogen-rich gas is injected into the closed circulating deoxidation and nitrogen filling system to compensate gas loss caused by continuous oxygen removal in the closed cabin, the internal and external pressure difference formed by continuous operation in the closed cabin is balanced in time, the problem of dilution of the external atmosphere of the traditional deoxidation nitrogen making equipment to the nitrogen concentration in the closed cabin in the gas supplementing stage is solved, and the problem of low deoxidation efficiency in the low-oxygen concentration section is solved.
2) By connecting the system air pressure balancing device into the closed circulating deoxygenation and nitrogen filling system, the traditional deoxygenation and nitrogen production equipment can completely realize closed circulating deoxygenation and nitrogen enrichment, an air supplementing mode is not needed during circulating nitrogen filling, the selection range of the equipment and the equipment configuration combination mode are greatly expanded, the advantages of various types of deoxygenation and nitrogen production equipment are furthest exerted, the advantage complementation of various types of equipment is realized, and the defects of long deoxygenation period and high energy consumption existing in the air-conditioning and insect prevention of the traditional deoxygenation and nitrogen production equipment are overcome.
3) The system air pressure balancing device is connected into the closed circulating deoxidation and nitrogen filling system, so that the advantages of low power distribution and large air volume of the normal-pressure deoxidation and nitrogen-rich equipment are exerted, the problem of insufficient power distribution capacity of the traditional deoxidation and nitrogen production equipment when nitrogen is filled between large and large closed bins for disinsection is solved, and the nitrogen filling between the large and large closed bins can be applied to the ground.
4) The oxygen generator is innovatively applied to a rapid mechanical oxygen and nitrogen rich system as oxygen and nitrogen rich equipment for nitrogen filling, air conditioning and insect prevention, so that the nitrogen-rich waste gas of the traditional oxygen generator is fully utilized, the advantage of the oxygen generator in recycling carbon dioxide generated by metabolism of agricultural products in a closed cabin is also exerted, and more energy conservation and emission reduction are realized.
Drawings
FIG. 1 is a schematic diagram of a process arrangement of a closed cycle deoxygenation and nitrogen-charging system connected with a system air pressure equalization device in the invention.
Fig. 2 is a schematic diagram of a system layout for a process of connecting a "system pressure equalization device" to a closed cyclic deoxygenation and nitrogen-charging system and for gas flow detection and compensation balance adjustment control in embodiments 1 and 4 of the present invention.
Fig. 3 is a schematic diagram of the system layout of the process of connecting the "system pressure equalization device" to the closed cycle deoxygenating and nitrogenizing system and the gas flow detection and compensation balance adjustment control in the embodiments 12 and 14 of the present invention.
In fig. 1, 2, and 3: an A-circulation deoxidation and nitrogen-filling system, an A1-sealed cabin (sealed cabin), an exhaust pipeline between an A2-sealed cabin, an input air pipeline between an A3-sealed cabin, an A4-deoxidation and nitrogen-rich device, a raw material gas inlet of the A41-deoxidation and nitrogen-rich device, a nitrogen gas outlet of the A42-deoxidation and nitrogen-rich device, an A43-tail gas discharge pipeline, an A44-deoxidation and nitrogen-rich device gas supplementing port, an A45-deoxidation and nitrogen-rich device gas supplementing port control valve, a B-system air pressure balancing device, a B1-nitrogen-rich gas source, a B2-nitrogen-rich gas source control valve, a B3-nitrogen-rich gas source output pipeline, a 1-gas flow detector, a 2-gas flow detector, A3-gas flow detector, a 4-gas flow detector, a 5-pressure sensor, a B4-bypass pipe, B5 bypass pipe, B6 bypass control valve.
The direction of the arrows in the figure indicates the direction of the air flow when the rapid mechanical deoxidation and nitrogen enrichment system is operated.
Detailed Description
The method for quick mechanical deoxidation and nitrogen enrichment between closed bins provided by the invention is further explained by combining the attached drawings and the specific embodiment.
The drawings are in simplified form only to more conveniently and clearly illustrate the relevant embodiments of the present invention. The accompanying brief description and drawings are only for purposes of example and are not intended to limit the invention, which is to be construed as merely illustrative of the embodiments which can be employed to illustrate the principles of the invention, and not limiting the invention thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the technical spirit of the invention.
Example 1:
the method comprises the following steps of sealing warehouses for agricultural products such as grains, medicinal materials and tobacco or various spaces and cabins where harmful organisms are likely to breed to form a sealed cabin A1, and sealing the warehouses by adopting the following methods in practical application:
stacking type tent: firstly, laying a layer of plastic low film at the bottom of a stack, stacking various agricultural products on a bottom film, covering a plastic tent on the stack, butting the plastic tent with the bottom film, and then strictly sealing to form a stacking type sealed cabin with six sealed sides; is suitable for sealing grains, tobacco, Chinese medicinal materials, etc. with external package.
Sealing the whole bin: the plastic film is combined with a sealing rubber groove or a caulking rubber to seal the ground plane, the wall body and the ceiling of the whole warehouse for the door and window, the ground, the wall gap and the pipeline wall-through hole of the warehouse, or the plastic film is covered on the surface of the bulk agricultural products and then the periphery of the plastic film is sealed with the wall to form a whole warehouse type sealed cabin with six sealed surfaces, which is suitable for bulk grain warehouses, high and large shelf type warehouses and warehouses which are not suitable for stacking and sealing.
The whole cabin is sealed: for a high-speed rail carriage, a container, a cabin and a cabin, 1-2 doors, doors and operating windows can be sealed by plastic films and used for accessing a ventilation pipeline, other doors or doors are in a tightly closed state, the high-speed rail or the cabin can seal two vehicle (cabin) doors which are furthest away from each other end to end, and the container can seal an observation window or an operating window which is further away from each other.
And (3) detecting the air tightness of the sealed cabin A1: the method is carried out according to the relevant provisions of the national standard GB/T25229-2010 grain and oil storage-single-storey house airtightness requirement of the people's republic of China, and the airtightness of the closed space is qualified when being not lower than the secondary airtightness standard;
as shown in figure 1, a method for quickly and mechanically deoxidizing nitrogen-rich in a closed bin comprises the following steps: after the construction of the sealed cabin A1 is completed, at least one exhaust pipeline A2 between the sealed cabins and at least one input air pipeline A3 between the sealed cabins are respectively connected to any two symmetrical surfaces between six sealed cabins;
the exhaust pipeline A2 between the closed bins and the input gas pipeline A3 between the closed bins can select plastic, rubber or metal pipes with the inner diameter of 10-200 mm according to the size of the space volume of A1 between the closed bins, and the exhaust pipeline A2 between the closed bins and the input gas pipeline A3 between the closed bins can be butted with the surfaces of the plastic tent between the closed bins and the plastic tent above the closed bins by adopting a pipeline joint of the Wuhan Dongchang storage technology company Limited;
then connecting an exhaust pipeline A2 between the closed bins with a raw material gas inlet A41 of the deoxidation and nitrogen-rich equipment, connecting an input gas pipeline A3 between the closed bins with a nitrogen gas outlet A42 of the deoxidation and nitrogen-rich equipment, and constructing a closed cycle deoxidation and nitrogen-charging system A which is formed by butt-joint and communication of an A1 between the closed bins, an exhaust pipeline A2 between the closed bins, an input gas pipeline A3 between the closed bins and the deoxidation and nitrogen-rich equipment A4;
a system air pressure balancing device B is connected to the cyclic deoxidation and nitrogen charging system A, the system air pressure balancing device B comprises a nitrogen-rich source B1, a nitrogen-rich source control valve B2 and a nitrogen-rich source output pipeline B3, the nitrogen-rich source control valve B2 is installed on the nitrogen-rich source output pipeline B3, the system air pressure balancing device B is connected to the cyclic deoxidation and nitrogen charging system A through a nitrogen-rich source output pipeline B3, the system air pressure balancing device B and the cyclic deoxidation and nitrogen charging system A jointly construct a rapid mechanical deoxidation and nitrogen-rich system, a deoxidation and nitrogen-rich device A4 in the cyclic deoxidation and nitrogen charging system A is started, air is pumped out of the sealed cabin A1 through an exhaust pipeline A2 of the sealed cabin, oxygen in the air is separated and removed and then is discharged out of a circulating deoxygenation nitrogen-charging system A through a tail gas discharge pipeline A43 taking oxygen as the main component, and separated and enriched high-concentration nitrogen is sent into the sealed cabin A1 through a nitrogen-rich gas outlet A42 of the deoxygenation nitrogen-rich equipment through a sealed cabin input air pipe A3; and a nitrogen-rich gas source B1 in the system air pressure balancing device B is started, a nitrogen-rich gas source control valve B2 is opened, and a nitrogen-rich gas source B1 fills nitrogen-rich gas into the circulating deoxidation and nitrogen-charging system A through the nitrogen-rich gas source control valve B2 and an input air pipeline A3 between the closed bins, so that the nitrogen-rich gas source is used for compensating the gas flow difference between an exhaust pipeline A2 between the closed bins and the input air pipeline A3 and the pressure difference formed inside and outside the system in the continuous operation process of the circulating deoxidation and nitrogen-charging system A, and ensuring the air pressure balance inside and outside the closed bins A1 and the mechanical deoxidation and nitrogen-rich efficiency.
In the embodiment, the deoxidation and nitrogen-rich equipment A4 adopts a VPSA deoxygenator, and the equipment target produced gas of the VPSA deoxygenator is nitrogen-rich gas and oxygen is equipment tail gas;
the nitrogen-rich gas source B2 in the system pressure equalizing device B adopts PSA nitrogen making machine and PSA nitrogen making machine to produce nitrogen-rich gas and oxygen as tail gas.
In this embodiment, the volume concentration of the nitrogen gas output by the PSA nitrogen generator in the system pressure equalization device B is > 98%.
In this embodiment, the system air pressure balancing device realizes detection and adjustment control of the compensation balance flow by the following means: a gas flow detector 1 is arranged on a nitrogen-rich source output pipeline B3, a gas flow detector 2 is arranged on a tail gas discharge pipeline A43 of the deoxidation and nitrogen-rich equipment for discharging tail gas mainly containing oxygen, the removal amount of the tail gas mainly containing oxygen and the compensation amount of the nitrogen-rich gas needing compensation are calculated through the detection values of the gas flow detector 1 and the gas flow detector 2, and the gas flow between an exhaust pipeline A2 between closed bins and an input gas pipeline A3 between the closed bins in the continuous operation process of the circulation deoxidation and nitrogen-filling system A tends to be balanced by adjusting a nitrogen-rich source control valve B2 (see figure 2);
in this embodiment, the gas flow detector 1 and the gas flow detector 2 are both made of Yifu electronics (Shanghai) limited company products;
in order to verify the efficiency of the rapid mechanical deoxidation nitrogen-rich air-conditioning insect prevention method provided by the invention, 168m is specially simulated and manufactured3The following experiments were performed between the closed cells: a (length, width and height) 14 m, 4 m and 3 m six-sided sealed tent made of a 0.12 mm PA/PE five-layer co-extrusion nylon composite membrane is adopted, an exhaust pipeline A2 of a sealed space and an input air pipeline A3 of the sealed space adopt plastic hoses with inner diameters of 50mm, a nitrogen-rich gas source control valve B2 is a Dn50 electric adjusting butterfly valve produced by Tianjin Ottok automated valves, a nitrogen-rich gas source output pipeline B3 adopts a co-plastic PVC pipeline with the outer diameter of 50mm, and the equipment configuration and the system construction of the experiment are carried out according to the following three modes:
(1) the first mode is as follows: performing closed circulation deoxidation, nitrogen filling and insect prevention under the condition of single equipment by using VPSA deoxygenator equipment, selecting equipment of Tianjin Jieshen science and technology limited, wherein the volume concentration of nitrogen in the equipment is 95%, and the nitrogen amount is 50Nm3H, the power of the equipment is 10 kw;
(2) and a second mode: the PSA nitrogen making machine is used for closed circulation deoxidation, nitrogen filling and insect prevention under the condition of single equipment, the equipment of Jiangsu Sujing group Limited company is adopted, the volume concentration of nitrogen in the equipment is 99.5 percent, and the nitrogen amount is 50Nm3H, the equipment power is 18 kw;
(3) and a third mode: according to the method of the embodiment 1 of the invention, a system air pressure balancing device B is connected into a closed circulation deoxidation and nitrogen filling system A and is constructed into a new mechanical deoxidation and nitrogen-rich system, a VPSA deoxygenator is used as a deoxidation and nitrogen-rich device A4, a PSA nitrogen making machine is used as a nitrogen-rich gas source B1, the total configuration power of the new system device is 28kw, and the experimental results are compared and shown in Table 2.
Table 2: comparison list of operation efficiency of mechanical deoxidation nitrogen-rich system under three modes
Figure BDA0002759437830000111
Table 2 shows that the unit deoxidation efficiency of the rapid mechanical deoxidation and nitrogen-rich system provided by the invention is about 1.8 times that of a PSA nitrogen making machine which is singly used and 3 times that of a VPSA deoxygenator, and the unit energy consumption of the rapid mechanical deoxidation and nitrogen-rich system is only 0.86 times that of a mode 1 and 0.93 times that of a mode 2, so that the deoxidation and nitrogen-rich efficiency is greatly improved, the deoxidation and nitrogen-rich time between closed bins is shortened, and the energy consumption is greatly reduced.
In fig. 1, the discharge port and the gas supply port of the oxygen-enriched gas source of the PSA nitrogen generator in the "system pressure equalization apparatus" are not shown in detail, because the nitrogen generator selected in the present invention adopts an open gas extraction, the target product gas of the PSA nitrogen generator is nitrogen, and the exhaust pipe, the exhaust port, the exhaust valve, and the like for discharging various tail gases such as oxygen, etc., are not described one by one.
Example 2:
the same as example 1 except that: a nitrogen-rich gas source B1 arranged in the system air pressure balancing device B uses a high-pressure type membrane nitrogen making machine, the target produced gas of the equipment is nitrogen-rich gas, and the produced oxygen is discharged to the external environment as the tail gas of the equipment; can use membrane separation oxygen-making equipment produced by Shanghai Ruihai gas technology company Limited.
Example 3:
basically the same as the embodiments 1 and 2, except that: the nitrogen-rich gas source B1 provided in the system pressure equalization device B uses a compressed steel bottle nitrogen or nitrogen station.
Example 4:
essentially the same as in examples 1, 2 or 3, except that: the nitrogen-rich gas source B1 configured in the system air pressure balancing device B uses a VPSA deoxygenator, the function of the nitrogen-rich gas source B1 is completed in the system air pressure balancing device B according to the process principle of the VPSA deoxygenator, and the system air pressure balancing device B is connected to the circulating deoxygenation nitrogen-charging system A according to the following process method for compensation and balance:
the nitrogen-rich source control valve B2 is arranged on a nitrogen-rich source output pipeline B3, the system air pressure balancing device B is connected to the cyclic deoxidation and nitrogen-charging system A through a nitrogen-rich source output pipeline B3, and the system air pressure balancing device B and the cyclic deoxidation and nitrogen-charging system A jointly construct a rapid mechanical deoxidation and nitrogen-rich system;
a bypass pipe B4 is arranged on a nitrogen-rich source output pipeline B3 between the VPSA deoxygenator B1 and a nitrogen-rich source control valve B2, and the VPSA deoxygenator B1 is connected to a deoxygenation and nitrogen-rich device air supplement port A44 through a bypass pipe B4;
opening a deoxidation and nitrogen-rich device A4 in the circulation deoxidation and nitrogen-rich system A, extracting air from a sealed cabin A1 through an exhaust pipeline A2 in the sealed cabin, separating and removing oxygen in the air, and then discharging the oxygen from a tail gas discharge pipeline A43 which mainly uses oxygen to the outside of the circulation deoxidation and nitrogen-rich system A, wherein the separated and enriched high-concentration nitrogen is sent to the sealed cabin A1 from a nitrogen-rich gas discharge port A42 of the deoxidation and nitrogen-rich device through an input air pipe A3 in the sealed cabin; and starting a VPSA deoxygenator B1 in the system air pressure balancing device B, opening a nitrogen-rich gas source control valve B2, and filling nitrogen-rich gas into the circulating deoxygenation and nitrogen-charging system A through the nitrogen-rich gas source control valve B2 and an input air pipeline A3 between the closed bins by the VPSA deoxygenator B1 so as to compensate the gas flow difference between an exhaust pipeline A2 and an input air pipeline A3 between the closed bins and the pressure difference formed inside and outside the system in the continuous operation process of the circulating deoxygenation and nitrogen-charging system A and ensure the air pressure balance inside and outside the closed bins A1 and the mechanical deoxygenation and nitrogen-rich efficiency.
When the volume concentration of the nitrogen output by the VPSA deoxygenator B1 is lower than that of the nitrogen in the sealed cabin A1, the air supplementing opening control valve A45 of the deoxygenation and nitrogen-rich equipment is opened, the nitrogen-rich source control valve B2 is closed at the same time, the nitrogen-rich gas output by the VPSA deoxygenator is filled into the deoxygenation and nitrogen-rich equipment A4 through the bypass pipe B4, the nitrogen-rich gas subjected to the deoxygenation treatment again through the deoxygenation and nitrogen-rich equipment A4 is sent into the sealed cabin A1, and the nitrogen-rich gas with lower concentration output by the VPSA deoxygenator B1 is prevented from being directly sent into the sealed cabin A1 to reduce the nitrogen concentration in the sealed cabin (see figure 2).
Example 5:
essentially the same as in examples 1, 2, 3 or 4, except that: a nitrogen-rich gas source B1 in the system pressure balancing device B is a PSA oxygen generator or a VPSA oxygen generator, the target produced gas of the equipment is a mixed gas of nitrogen-rich gas and carbon dioxide, and oxygen produced by the equipment is discharged to the external environment as the tail gas of the equipment; can be selected from Yigas science and technology Limited in Zhejiang.
Example 6:
essentially the same as in examples 1, 2, 3, 4 or 5, except that: a nitrogen-rich gas source B1 in the system pressure balancing device B is a normal-pressure membrane nitrogen making machine, the target produced gas of the equipment is nitrogen-rich gas, and oxygen produced by the equipment is discharged to the external environment as the tail gas of the equipment; can use membrane separation oxygen-making equipment produced by Shanghai Ruihai gas technology company Limited.
Example 7:
basically the same as the embodiments 1, 2, 3, 4, 5 and 6, except that: the deoxidation and nitrogen enrichment device A4 is a PSA nitrogen making machine.
Example 8:
basically the same as the embodiments 1, 2, 3, 4, 5, 6 and 7, except that: the deoxidation and nitrogen-rich device A4 is a PSA oxygen generator, the target product gas of the equipment is a mixed gas of nitrogen-rich gas and carbon dioxide, and oxygen generated by the equipment is discharged to the external environment as the tail gas of the equipment.
Example 9:
substantially the same as in examples 1, 2, 3, 4, 5, 6, 7 or 8, except that: the deoxidation and nitrogen-rich device A4 is a VPSA oxygen generator, the target product gas of the equipment is a mixed gas of nitrogen-rich gas and carbon dioxide, and oxygen generated by the equipment is discharged to the external environment as the tail gas of the equipment.
Example 10:
basically the same as the embodiments 1, 2, 3, 4, 5, 6, 7, 8 and 9, except that: the deoxidation and nitrogen enrichment device A4 is a high-pressure type membrane nitrogen making machine.
Example 11:
basically the same as the embodiments 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10, except that: the deoxidation and nitrogen enrichment device A4 is a normal pressure type film nitrogen making machine.
Example 12:
substantially the same as in examples 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11, except that: the system air pressure balancing device B can also realize the detection and adjustment control of the compensation balance flow in the following way: a gas flow detector 1 is arranged on a nitrogen-rich source output pipeline B3, a gas flow detector 3 is arranged at a raw material gas inlet A41 of a deoxidation and nitrogen-rich device, a gas flow detector 4 is arranged at a nitrogen outlet A42 of the deoxidation and nitrogen-rich device, the compensation amount of the nitrogen-rich gas to be compensated is calculated through the difference value of the gas flow detector 3 at the raw material gas inlet A41 of the deoxidation and nitrogen-rich device and the gas flow detector 4 at the nitrogen outlet A42 of the deoxidation and nitrogen-rich device, and the gas flow between an exhaust pipeline A2 between the closed bins and an input gas pipeline A3 in the continuous operation process of the circulation deoxidation and nitrogen-filling system A is enabled to tend to be balanced by adjusting a nitrogen-rich gas source control valve B2 (see figure 3).
Example 13:
substantially the same as in examples 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12, except that: a pressure sensor 5 is arranged between the closed bins, and when the pressure sensor 5 detects that the pressure difference exists between the inside and the outside of the closed bins, a nitrogen-rich source control valve B2 is adjusted to ensure that the pressure difference between the inside and the outside of the closed bins tends to be balanced;
in this embodiment, the pressure sensor may be a product of a pressure sensor of honeywell (china) ltd.
Example 14:
substantially the same as in examples 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or 13, except that: when the volume concentration of the nitrogen-rich gas source B1 is lower than the nitrogen concentration in the closed cabin, the system air pressure balancing device B can be connected to the circulating deoxygenation and nitrogen charging system A according to the following method for compensation and balance: connecting a nitrogen-rich gas source B1 into an exhaust pipeline A2 between the closed bins: a bypass pipe B5 is arranged on a nitrogen-rich source output pipeline B3 between a nitrogen-rich source B1 and a nitrogen-rich source control valve B2, the nitrogen-rich source B1 is connected to an exhaust pipeline A2 between the closed bins through a bypass pipe B5, when the volume concentration of nitrogen of the nitrogen-rich source B1 is lower than that of nitrogen in the closed bins A1, the bypass control valve B6 on a bypass pipe B5 is opened, the nitrogen-rich source control valve B2 is closed at the same time, nitrogen-rich gas output by the nitrogen-rich source B1 is filled into the exhaust pipeline A2 between the closed bins through the bypass pipe B5, then the nitrogen-rich gas is sent into a nitrogen-rich source A4 through a deoxidized nitrogen-rich device raw material gas inlet A41, and sent into the closed bins A1 after being deoxidized by the deoxidized nitrogen-rich device A4, and the nitrogen-rich gas with lower concentration is prevented from being directly sent into the closed bins A1 to.

Claims (6)

1. A method for quickly and mechanically deoxidizing and enriching nitrogen between closed bins is characterized in that: comprises a sealed cabin (A1), an exhaust pipeline (A2) between the sealed cabins, an input air pipeline (A3) between the sealed cabins, a deoxidation and nitrogen-rich device (A4) and a tail gas exhaust pipeline (A43) mainly based on oxygen, wherein the tail gas exhaust pipeline (A43) is connected with a tail gas discharge port of the deoxidation and nitrogen-rich device (A4), the deoxidation and nitrogen-rich device (A4) is provided with a deoxidation and nitrogen-rich device air supplement port (A44), the deoxidation and nitrogen-rich device air supplement port (A44) is provided with a deoxidation and nitrogen-rich device air supplement port control valve (A45), the exhaust pipeline (A2) between the sealed cabins is connected with a raw material gas inlet (A41) of the deoxidation and nitrogen-rich device (A4), the input air pipeline (A3) between the sealed cabins is connected with a nitrogen discharge port (A42) of the deoxidation and nitrogen, the closed cabin (A1), the exhaust pipeline (A2) between the closed cabins, the deoxidation and nitrogen enrichment equipment (A4) and the input air pipeline (A3) between the closed cabins are mutually butted and communicated to form a closed circular deoxidation and nitrogen enrichment system (A); the method is characterized in that: the method comprises the following steps that a system air pressure balancing device (B) is connected to a cyclic deoxidation and nitrogen charging system (A), the system air pressure balancing device (B) comprises a nitrogen-rich source (B1), a nitrogen-rich source control valve (B2) and a nitrogen-rich source output pipeline (B3), the nitrogen-rich source control valve (B2) is installed on the nitrogen-rich source output pipeline (B3), the system air pressure balancing device (B) is connected to the cyclic deoxidation and nitrogen charging system (A) through the nitrogen-rich source output pipeline (B3), and the system air pressure balancing device (B) and the cyclic deoxidation and nitrogen charging system (A) are jointly constructed to complete a rapid mechanical deoxidation and nitrogen-rich system; opening a deoxidation and nitrogen-rich device (A4) in the circulation deoxidation and nitrogen-rich system (A), pumping air out of a closed cabin (A1) through an exhaust pipeline (A2) between the closed cabins, separating and removing oxygen in the air, discharging the separated and removed air out of the circulation deoxidation and nitrogen-rich system (A) through a tail gas discharge pipeline (A43) mainly containing oxygen, and sending separated and enriched high-concentration nitrogen into the closed cabin (A1) from a nitrogen gas discharge port (A42) of the deoxidation and nitrogen-rich device through an input air pipeline (A3) between the closed cabins; opening a nitrogen-rich source (B1) in a system air pressure balancing device (B), opening a nitrogen-rich source control valve (B2), and filling nitrogen-rich gas into the cyclic deoxidation and nitrogen-charging system (A) by the nitrogen-rich source (B1) through the nitrogen-rich source control valve (B2), an input gas pipeline (A3) among closed bins or an exhaust pipeline (A2) among the closed bins, wherein the nitrogen-rich gas is used for compensating the gas flow difference between the exhaust pipeline (A2) and the input gas pipeline (A3) among the closed bins and the pressure difference formed inside and outside the system in the continuous operation process of the cyclic deoxidation and nitrogen-charging system (A), so that the air pressure balance and the mechanical deoxidation and nitrogen-rich efficiency inside and outside the closed bins (A1) are ensured.
2. The method for rapid mechanical deoxidation and nitrogen enrichment between closed bins as claimed in claim 1, wherein: the nitrogen-rich source (B1) of the system air pressure balancing device (B) uses one of a PSA nitrogen making machine, a VPSA deoxygenator, a PSA oxygen making machine, a VPSA oxygen making machine, a high-pressure membrane separation nitrogen making machine, a normal-pressure membrane separation nitrogen making machine, a compressed steel bottled nitrogen gas or a nitrogen gas station, or the combination of the nitrogen gas and the nitrogen gas in a series or parallel mode.
3. The method for rapid mechanical deoxidation and nitrogen enrichment between closed bins as claimed in claim 1, wherein: the oxygen and nitrogen removing and enriching equipment (A4) is any one of a PSA nitrogen generator, a VPSA deoxygenator, a PSA oxygen generator, a VPSA oxygen generator, a high-pressure membrane separation nitrogen generator and a normal-pressure membrane separation nitrogen generator, or is combined by using the above devices in a series or parallel mode.
4. The method for the rapid mechanical deoxidation and nitrogen enrichment of the closed chamber as claimed in claim 1, 2 or 3, wherein: the system air pressure balancing device (B) realizes monitoring and balance adjustment control of system flow and air pressure through one of the following three modes:
(1) a gas flow detector (1) is arranged on the nitrogen-rich gas source output pipeline (B3), a gas flow detector (2) is arranged on the tail gas discharge pipeline (A43), the removal amount of tail gas mainly containing oxygen and the compensation amount of the nitrogen-rich gas needing to be compensated are calculated through the detection values of the gas flow detector (1) and the gas flow detector (2), and the gas flow between the gas discharge pipeline (A2) and the gas input pipeline (A3) in the continuous operation process of the circulating deoxygenation and nitrogen-filling system (A) tends to be balanced by adjusting a nitrogen-rich gas source control valve (B2);
(2) a gas flow detector (1) is arranged on the nitrogen-rich gas source output pipeline (B3), a gas flow detector (3) is arranged on a raw material gas inlet (A41) of the deoxidation and nitrogen-rich equipment, a gas flow detector (4) is arranged on a nitrogen outlet (A42) of the deoxidation and nitrogen-rich equipment, the compensation amount of the nitrogen-rich gas to be compensated is calculated through the difference value of the gas flow detector (3) at the raw material gas inlet (A41) of the deoxidation and nitrogen-rich equipment and the gas flow detector (4) at the nitrogen outlet (A42) of the deoxidation and nitrogen-rich equipment, and the gas flow between a closed cabin exhaust pipeline (A2) and an input gas pipeline (A3) in the continuous operation process of the cyclic deoxidation and nitrogen charging system (A) is balanced by adjusting a nitrogen-rich gas source control valve (B2);
(3) and a pressure sensor (5) is arranged between the closed bins, and when the pressure sensor (5) detects that the pressure difference exists between the inside and the outside of the closed bins, a nitrogen-rich source control valve (B2) is adjusted to ensure that the pressure difference between the inside and the outside of the closed bins tends to be balanced.
5. The method for rapid mechanical deoxidation and nitrogen enrichment of the closed chamber according to the claim 1, 2, 3 or 4, characterized in that: the nitrogen volume concentration of the nitrogen-rich source (B1) in the system air pressure equalizing device (B) is more than 78 percent, and when the nitrogen volume concentration of the nitrogen-rich source (B1) is lower than the nitrogen volume concentration in the closed cabin, the system air pressure equalizing device (B) is connected to the circulating deoxygenation nitrogen-filling system (A) according to one of the following 2 methods and performs compensation and equalization:
(1) connecting a nitrogen-rich gas source (B1) to a gas supplementing port (A44) of a deoxidation and nitrogen-rich device: a bypass pipe (B4) is arranged on a nitrogen-rich source output pipeline (B3) between a nitrogen-rich source (B1) and a nitrogen-rich source control valve (B2), the nitrogen-rich source (B1) is connected to a gas supplementing port (A44) of the deoxidation and nitrogen-rich device through the bypass pipe (B4), when the volume concentration of nitrogen of the nitrogen-rich source (B1) is lower than that of nitrogen in a sealed cabin (A1), the gas supplementing port control valve (A45) of the deoxidation and nitrogen-rich device is opened, the nitrogen-rich source control valve (B2) is closed at the same time, nitrogen-rich gas output by the nitrogen-rich source is filled into the deoxidation and nitrogen-rich device (A4) through the bypass pipe (B4), and then nitrogen-rich gas after deoxidation treatment by the deoxidation and nitrogen-rich device (A4) is sent into the sealed cabin (A1), so that nitrogen-rich gas with lower concentration is prevented from being directly sent into the sealed cabin (A1) to;
(2) connecting a nitrogen-rich gas source (B1) to an exhaust pipeline (A2) between the closed bins: a bypass pipe (B5) is arranged on a nitrogen-rich source output pipeline (B3) between a nitrogen-rich source (B1) and a nitrogen-rich source control valve (B2), a bypass control valve (B6) is arranged on the bypass pipe (B5), the nitrogen-rich source (B1) is connected to an exhaust pipeline (A2) between the closed bins through the bypass pipe (B5), when the volume concentration of nitrogen of the nitrogen-rich source (B1) is lower than that of nitrogen in the closed bins (A1), the bypass control valve (B6) on the bypass pipe (B5) is opened, the nitrogen-rich source control valve (B2) is closed, the nitrogen-rich gas output by the nitrogen-rich source (B1) is filled into the exhaust pipeline (A2) between the closed bins through the bypass pipe (B5), then is sent into a deoxidation equipment (A4) through a raw material gas inlet (A41) of the deoxidation nitrogen-rich device, and then sent into a deoxidation equipment (1) between the closed bins through A4), the nitrogen-rich gas with lower concentration is prevented from being directly sent into the sealed cabin (A1) to reduce the concentration of the nitrogen in the sealed cabin.
6. The method for rapid mechanical deoxidation and nitrogen enrichment of the closed chamber according to the claim 1, 2, 3, 4 or 5, characterized in that: when the nitrogen volume concentration of the nitrogen-rich source (B1) is greater than or equal to the nitrogen volume concentration in the sealed cabin (A1), the system air pressure equalizing device (B) directly accesses the nitrogen-rich source (B1) to the sealed cabin (A1) through the nitrogen-rich source output pipeline (B3) to compensate and equalize pressure.
CN202011213097.6A 2020-11-03 2020-11-03 Method for quickly and mechanically deoxidizing and enriching nitrogen between closed bins Active CN112265971B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140326021A1 (en) * 2013-05-06 2014-11-06 Amrona Ag Inerting method and system for reducing oxygen
CN111530233A (en) * 2020-04-29 2020-08-14 武汉东昌仓贮技术有限公司 Method and device for cyclic deoxidation, nitrogen-rich insect prevention between closed bins

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140326021A1 (en) * 2013-05-06 2014-11-06 Amrona Ag Inerting method and system for reducing oxygen
CN111530233A (en) * 2020-04-29 2020-08-14 武汉东昌仓贮技术有限公司 Method and device for cyclic deoxidation, nitrogen-rich insect prevention between closed bins

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