CN105257980B

CN105257980B - A kind of technical method of low pressure gas storage methane or natural gas

Info

Publication number: CN105257980B
Application number: CN201510709502.6A
Authority: CN
Inventors: 吴云
Original assignee: Chongqing Technology and Business University
Current assignee: Chongqing Technology and Business University
Priority date: 2015-10-28
Filing date: 2015-10-28
Publication date: 2018-04-03
Anticipated expiration: 2035-10-28
Also published as: CN105257980A

Abstract

The present invention provides a kind of new improved method, this method is based on active carbon adsorption memory technology, activated carbon adsorbent is improved by aperture adjustment technology, and combine the optimal design-aside that adsorption element is set, to reach the adsorption storage capability for improving methane or natural gas, the purpose of the heat endurance of storing process is improved.Its technical characteristics includes：(1) it is more sorbent used than same type technology that there is stronger absorption property using 1.1~1.5nm scope micropore distributed numbers in aperture adjustment technology increase activated carbon, so as to improve its adsorption capacity to methane or natural gas；(2) Soaking treatment is carried out to adsorbent, adsorbent surface is formed water membrane, further increase adsorbance of the adsorbent to methane or natural gas, while enhance the heat endurance of storage system；(3) adsorbent is filled in adsorption column, and set using boundling, reached the purpose of increase amount of storage.

Description

A kind of technical method of low pressure gas storage methane or natural gas

Technical field

The invention belongs to gas storing technology field, its technology contents is related to a kind of storage method of methane or natural gas, profit The low pressure gas storage to light gas such as methane can be realized with this method.

Background technology

Natural gas or methane have many advantages as oil replacement fuel.First, natural gas resource rich reserves, China It is accumulative at present to verify gas reserves up to 2.16 × 10,400,000,000 m 3, and the stock number available of surrounding countries' natural gas is also suitable Greatly, calculated with existing depletion rate, World reserves of natural gas can also at least use 60 years, and petroleum resources are then about 30 Will be depleted after year；Secondly, pollution is light, and environment friendly is strong.Air pollution is increasingly tight as caused by vehicle fuel at present Weight, and sulfur content is less in natural gas, easily removing, combustibility is strong, and combustion process is complete, granular material discharged few.From administer it is big, Middle urban atmospheric pollution angle is seen, compared with fuel-engined vehicle, CO2 discharge capacity reduces 25%, CO in natural gas and auto tail gas Discharge capacity reduce 89.7%, SO2 discharge capacity and reduce 70%, NO discharge capacitys and reduce 40%, hydrocarbons discharge capacity drop It is low

70%, discharge quantity of particulate matter reduces 80%.It was predicted that 2010~2020 years natural gases are in China's energy knot Ratio in structure is up to 35% ~ 40%, and natural gas will progressively turn into the preferred fuels for substituting oil in 21st century.However, natural gas Or the storage and transport of methane are the key technical problems that it is solved as oil replacement fuel requirement.

At present, known methane or natural gas storage technology mainly have liquefaction technology (LNG), compress technique (CNG) and water Conjunction technology (NGH).These technical methods both have it is respective the advantages of, but there is also it is respective the shortcomings that.For example, liquefied storage technology Memory capacity it is maximum, storage directly as motor vehicle fuel than that up to more than 600 times, can supply, but the technology is in the presence of being liquefied as This height, gas station technical difficulty is big, and investment is high, requires high to the heat-insulating property of storage bottle material, automobile needs to install additional using liquefied gas A series of defects such as auxiliary equipment；Although the memory capacity for compressing storing technology is also larger, it is too high to there is pressure store The problems such as (25Mpa), compression device investment is big, and the resistance to pressure request of holding bottle is high, and potential safety hazard is more；Although it is hydrated storing technology tool Have, store the advantages that pressure is low, and storage condition is gentle, safe, but there is also induction period length is hydrated, decomposition of hydrate to be delayed Slowly, the problems such as inconvenient for use.Therefore, in order to reduce methane or natural gas storage and use cost, solve existing memory technology and deposit

Storage pressure it is high, equipment investment is big, potential safety hazard is more, inconvenient for use the problems such as, it is necessary to develop a kind of new Substitute technology method solves the storage problem of methane or natural gas.

Absorbing and storing technology is a kind of new gas memory technology method occurred in recent years.The technology refers in storage tank Load the natural gas Special adsorbent of high-specific surface area, using its huge internal surface area and abundant microcellular structure in 4Mpa The technical method for storing methane or Adsorption Natural Gas under~5Mpa mesolow.Because the technology has, pressure is low, aerating The advantages that station equipment small investment, gas bomb are from heavy and light, material requirements is low, high safety, therefore received significant attention.However, The problems such as existing absorbing and storing technology is relatively low there is also memory capacity, and stability is easily affected by temperature.To solve existing absorption The problem of memory technology is present, the present invention provide a kind of new improved method, this method can greatly increase adsorbent to methane or The adsorption capacity of natural gas, storage pressure is reduced, the heat endurance of storing process is improved, so that absorbing and storing technology can be more It is applied to the storage of methane or natural gas well.

The content of the invention

In order to overcome, storage pressure existing for current methane or natural gas storage technology is high, equipment investment is big, material requirement High, the defects of security is low, inconvenient for use, the present invention provides a kind of new memory technology method, and this method is deposited in novel adsorption It is improved on the basis of storage technology, adsorption capacity of the adsorbent to methane or natural gas can be greatly increased, reduces storage pressure, The heat endurance of storing process is improved, the storage of methane or natural gas can be preferably applied for.

The technical solution adopted for the present invention to solve the technical problems is：(1) novel adsorption memory technology is selected as storage first The basic technology of alkane or natural gas；(2) 1.1~1.5nm in activated carbon adsorbent is improved using adsorbent aperture regulation technology Micropore quantity, result of study show that the micropore quantity increase of this pore diameter range is highly beneficial to adsorbed methane, so as to improve Adsorption capacity of the carbon adsorbent to methane or natural gas；(3) activated carbon adsorbent is soaked in water, the activity after water soaks Carbon adsorbent will be greatly increased to the adsorbance of methane or natural gas, and after its reason is soaking, activated carbon hole surface can be formed Water membrane, when methane contacts moisture film, hydrate is easily formed, so as to promote absorption of the adsorbent to methane and stably, Simultaneously because activated carbon specific surface area is big, water film thickness is small, and the induction period of gas hydrate synthesis is short, and the self-shield effect of water is weak, passes Matter resistance is low, and desorption rate is also than very fast.On the other hand, due to there is the presence of water, the increase of system thermal capacitance, it is not easy by environment temperature The influence of change, stability are enhanced.

The technical characteristics that the present invention has are：（1）Compared with traditional methane or natural gas storage technology, the present invention carries The memory technology method based on absorption supplied can store methane or natural gas under 4~5Mpa low pressure, well below compression The storage pressure of 25Mpa needed for memory technology, and store ratio and can reach more than 180, reach the requirement of national regulation.（2） 1.1~1.5nm scope micropore distributed numbers in activated carbon are increased using aperture adjustment technology, so as to improve it to methane Or the adsorption capacity of natural gas, it is more sorbent used than same type technology that there is stronger absorption property.（3）Water-filling is entered to adsorbent Leaching is handled, and adsorbent surface is formed water membrane, is further increased adsorbance of the adsorbent to methane or natural gas, simultaneously Enhance the heat endurance of storage system.

Embodiment

The 1st, activated carbon adsorbent is carried out to Fractional Heat-treatment regulation activated carbon pore-size distribution under the conditions of 600 DEG C and 800 DEG C, Wherein, 600 DEG C are handled 1.5 hours, and 800 DEG C are handled 0.5 hour, its 1.1~1.5nm of the activated carbon after heat treatment obtained The distributed quantity in aperture will add more than 20% than before processing, and the absorption affinity of methane or natural gas is enhanced.

2nd, the activated carbon adsorbent after via hole diameter is adjusted is soaked 24 hours in deionized water, logical in cool place after filtering Dried in the air at wind to semi-wet state, its moisture is controlled 8~10%.

3rd, obtained activated carbon adsorbent is filled in circular metal adsorption column, and the gold for being filled with adsorbent by more Belong in storage container of the adsorption column insertion with pipe support and be provided with filling interface and valve into collection pencil, memory upper end, methane or When natural gas is filling, gas pours into through compressor under 4~5Mpa low pressure from interface.

Claims

1. a kind of be used to increase methane or the technical method of Adsorption Natural Gas amount of storage, including following content：

(1) activated carbon adsorbent is carried out to Fractional Heat-treatment regulation activated carbon pore-size distribution under the conditions of 600 DEG C and 800 DEG C, its In, 600 DEG C are handled 1.5 hours, and 800 DEG C are handled 0.5 hour, its 1.1~1.5nm aperture of the activated carbon after heat treatment obtained Distributed quantity will add more than 20% than before processing, and the absorption affinity of methane or natural gas is enhanced；

(2) activated carbon adsorbent after via hole diameter is adjusted is soaked 24 hours in deionized water, after filtering at shady and cool ventilation Dry in the air to semi-wet state, its moisture is controlled 8~10%；

(3) obtained activated carbon adsorbent is filled in circular metal adsorption column, and the metal for being filled with adsorbent by more Be provided with filling interface and valve into collection pencil, storage container upper end in storage container of the adsorption column insertion with pipe support, methane or When natural gas is filling, gas pours into through compressor under 4~5Mpa low pressure from interface.