CN103353207B - Device for purifying methane liquid from purified landfill gas - Google Patents
Device for purifying methane liquid from purified landfill gas Download PDFInfo
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- CN103353207B CN103353207B CN201310308731.8A CN201310308731A CN103353207B CN 103353207 B CN103353207 B CN 103353207B CN 201310308731 A CN201310308731 A CN 201310308731A CN 103353207 B CN103353207 B CN 103353207B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0204—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the feed stream
- F25J3/0209—Natural gas or substitute natural gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
- F25J3/0233—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of CnHm with 1 carbon atom or more
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
- F25J3/0257—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of nitrogen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/02—Processes or apparatus using separation by rectification in a single pressure main column system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/40—Features relating to the provision of boil-up in the bottom of a column
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/50—Processes or apparatus using separation by rectification using multiple (re-)boiler-condensers at different heights of the column
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/74—Refluxing the column with at least a part of the partially condensed overhead gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/60—Processes or apparatus using other separation and/or other processing means using adsorption on solid adsorbents, e.g. by temperature-swing adsorption [TSA] at the hot or cold end
- F25J2205/66—Regenerating the adsorption vessel, e.g. kind of reactivation gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/66—Landfill or fermentation off-gas, e.g. "Bio-gas"
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2215/00—Processes characterised by the type or other details of the product stream
- F25J2215/04—Recovery of liquid products
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/30—Compression of the feed stream
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/12—External refrigeration with liquid vaporising loop
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/14—External refrigeration with work-producing gas expansion loop
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/42—Quasi-closed internal or closed external nitrogen refrigeration cycle
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Abstract
The invention discloses a device for purifying methane liquid from purified landfill gas. The device comprises a pretreatment unit, a molecule sieve absorption unit, a main heat exchanger, a low-temperature rectifying tower, a nitrogen refrigeration circulation unit and a controller. The device for purifying the methane liquid from the purified landfill gas has the advantages that energy resources are fully utilized, the landfill gas can be prevented from being directly discharged into air to cause environment pollution and the greenhouse effect, the cold source and the heat source needed in the process that low-temperature rectification is carried out on the purified landfill gas to extract the methane liquid are both provided by the nitrogen refrigeration circulation unit, the device is a simple, economical and practical innovation, the energy of all working sections can achieve cold and heat energy exchange, the energy utilization rate is high, recycled liquid methane is high in purification degree, and the effects of saving energy, reducing emissions and managing the environment are achieved.
Description
Technical field
The present invention relates to gas low temperature rectifying separation technology field, particularly a kind of device of methane liquid of purifying from the rubbish landfill gas after purification.
Background technology
Along with continually developing of population sharp increase and natural resources, the gas that industrial refuse, house refuse produce seriously causes global warming, threatens the problem of human health to cause countries in the world scientist to pay attention to.For making the greenhouse gases stable content in air a suitable level, prevent violent climate change from damaging the mankind, Kyoto Protocol is have passed at kyoto, Japan, specify developed country, developing country bears the obligation reducing carbon emission amount, China starts the task of bearing reduction of greenhouse gas discharge.
At present, have a hundreds of refuse landfill of more than 20 country to install the recycle device of rubbish landfill gas, Land use systems comprises: 1) directly burning produces steam, for life or industrial heating; 2) generated electricity by internal combustion engine, as the power fuel of means of transport; 3) for carbon dioxide commercial; 4) for the manufacture of the raw material of methyl alcohol; 5) after deep purifying process, piped gas etc. is used as.Wherein generate electricity, domestic fuel and motor vehicle fuel are three kinds of Land use systems the most general.
China puts into effect " Chinese MSW research refuse landfill gas Collection utilization national action plan ", the recycling of rubbish landfill gas is continue after the ground startings such as Anshan, Hangzhou, Nanjing, obtain the high degree of attention and support of leaders, extensive exploitation throughout the country, and successfully grasp rubbish rubbish landfill gas pretreatment technology, but majority is directly to burn, also utilizes TSA and PSA technique to reclaim carbon dioxide and methane example in the recent period, but there is the problem that product purity is low, cost is high.
Summary of the invention
Technical problem to be solved by this invention is, the device of the methane liquid of purifying from the rubbish landfill gas after purification providing a kind of product purity high.
For solving the problems of the technologies described above, the device of a kind of methane liquid of purifying from the rubbish landfill gas after purification provided by the invention, it comprises pretreatment unit, molecular sieve adsorption unit, main heat exchanger, low-temperature fractionating tower, nitrogen refrigerating cycle unit and controller; Wherein,
Pretreatment unit, comprises the rubbish landfill gas vacuum tank and garbage loading embeading air compressor that connect successively;
Molecular sieve adsorption unit, by the carbon dioxide in multiple absorption tower adsorbs rubbish landfill gas composed in parallel and water, is communicated with the garbage loading embeading air compressor in described pretreatment unit at the bottom of the tower of adsorption tower;
Low-temperature fractionating tower, is made up of upper condenser/evaporator, packing type rectifying tower body and lower condenser/evaporator;
Nitrogen refrigerating cycle unit is communicated with main heat exchanger;
One end of described main heat exchanger is communicated with the tower top of molecular sieve adsorption unit adsorption tower, and the other end of main heat exchanger is communicated with the upper condenser/evaporator in low-temperature fractionating tower, packing type rectifying tower body.
Further, in described upper condenser/evaporator, be provided with First Heat Exchanger, the dividing plate being provided with the second heat exchanger in lower condenser/evaporator and being separated with liquid methane by liquid nitrogen; Described nitrogen refrigerating cycle unit forms by forming the nitrogen stabilization pressure tank in loop, nitrogen compressor, cooler, nitrogen heat exchanger and gas-liquid separator, nitrogen efferent duct and nitrogen input pipe is provided with in described nitrogen heat exchanger, be provided with decompressor between nitrogen input pipe and nitrogen efferent duct, decompressor be connected with the brake controlling decompressor rotating speed; Input channel, pure gas output channel and mist output channel is provided with in described main switch, the input of pure gas output channel is connected with nitrogen efferent duct, output is communicated with nitrogen stabilization pressure tank, the input of gas-liquid mixed conduit is communicated with the tower top of adsorption tower, output is communicated with packing type rectifying tower body, the input of mist output channel is communicated with the top of First Heat Exchanger, and output is communicated with adsorption tower; Gas-liquid separator is communicated with the sidepiece of upper condenser/evaporator with the bottom of lower condenser/evaporator respectively, and the sidepiece of lower condenser/evaporator is communicated with nitrogen input pipe.
Further, the first program-controlled valve assembly that described molecular sieve adsorption unit is connected with pipeline enclosure by adsorption tower and adsorption tower forms, and realizes the opening and closing of valve by controller.Each adsorption tower adopts and connects side by side, and install some first program-controlled valves according to timing requirements, realized the open and close of valve by controller, several adsorption tower staggers mutually in time, and alternating sorbent can realize the object being continuously separated purification.
Further, hold liquid methane place in described lower condenser/evaporator and be communicated with liquid methane groove.Methane liquid after purifying is transported in liquid methane groove.
Further, the filter of the dust filtered in gas-liquid mixture is provided with between the input of described input channel and adsorption tower.
Further, electric heater is provided with between the output of described mist output channel and adsorption tower.Gaseous mixture, after electric heater heating, enters into the adsorption tower being in saturation state, carries out activating and regenerating to this adsorption tower.
Further, mist output channel between described main heat exchanger and electric heater, nitrogen input pipe between gas-liquid separator and nitrogen heat exchanger, the pipeline that gas-liquid separator is communicated with the bottom of lower condenser/evaporator, the pipeline that gas-liquid separator is communicated with upper condenser/evaporator, the pipeline that nitrogen input pipe is communicated with the sidepiece of lower condenser/evaporator, the pipeline that nitrogen efferent duct is communicated with pure gas output channel and the pipeline that input channel is communicated with packing type rectifying tower body are respectively equipped with the second program-controlled valve assembly, and the opening and closing of valve are realized by controller.
After adopting above structure, the device of methane liquid of purifying from the rubbish landfill gas after purification of the present invention compared with prior art, have the following advantages: take full advantage of the energy, can prevent rubbish landfill gas from directly entering environmental pollution that air causes and greenhouse effects, rubbish landfill gas after purification carries out required low-temperature receiver and thermal source in cryogenic rectification extraction liquid methane process to be provided by nitrogen refrigerating cycle unit, a kind of simple, economical, practical innovation, the energy of each workshop section can realize cold, thermal energy exchanges, capacity usage ratio is high, the liquid methane purity reclaimed is high, reach energy-saving and emission-reduction, the effect of Environment control.
Accompanying drawing explanation
Fig. 1 is syndeton schematic diagram of the present invention.
Wherein: rubbish landfill gas vacuum tank 1, garbage loading embeading air compressor 2, adsorption tower 3, upper condenser/evaporator 4, packing type rectifying tower body 5, lower condenser/evaporator 6, main heat exchanger 7, First Heat Exchanger 8, second heat exchanger 9, dividing plate 10, nitrogen stabilization pressure tank 11, nitrogen compressor 12, cooler 13, nitrogen heat exchanger 14, gas-liquid separator 15, nitrogen efferent duct 16, nitrogen input pipe 17, decompressor 18, input channel 19, pure gas output channel 20, mist output channel 21, liquid methane groove 22, filter 23, electric heater 24.
Detailed description of the invention
Below by embodiment, the invention will be further described by reference to the accompanying drawings.
As shown in Figure 1, the device of the methane liquid of purifying from the rubbish landfill gas after purification that the present embodiment provides, it comprises pretreatment unit, molecular sieve adsorption unit, main heat exchanger, low-temperature fractionating tower, nitrogen refrigerating cycle unit and controller; Pretreatment unit, comprises the rubbish landfill gas vacuum tank 1 and garbage loading embeading air compressor 2 that connect successively; Molecular sieve adsorption unit, the adsorption tower 3 composed in parallel by two adsorbs carbon dioxide in rubbish landfill gas and water, is communicated with at the bottom of the tower of adsorption tower 3 with the garbage loading embeading air compressor 2 in described pretreatment unit; Low-temperature fractionating tower, is made up of upper condenser/evaporator 4, packing type rectifying tower body 5 and lower condenser/evaporator 6.
Be provided with First Heat Exchanger 8 in described upper condenser/evaporator 4, the dividing plate 10 being provided with the second heat exchanger 9 in lower condenser/evaporator 6 and being separated with liquid methane by liquid nitrogen, the top of dividing plate 10 is liquid methane, and the below of dividing plate 10 is liquid nitrogen; Described nitrogen refrigerating cycle unit forms by forming the nitrogen stabilization pressure tank 11 in loop, nitrogen compressor 12, cooler 13, nitrogen heat exchanger 14 and gas-liquid separator 15, nitrogen efferent duct 16 and nitrogen input pipe 17 is provided with in described nitrogen heat exchanger 14, be provided with decompressor 18 between nitrogen input pipe 17 and nitrogen efferent duct 16, decompressor 18 be connected with the brake controlling decompressor rotating speed; Input channel 19, pure gas output channel 20 and mist output channel 21 is provided with in described main switch 7, the input of pure gas output channel 20 is connected with nitrogen efferent duct 16, output is communicated with nitrogen stabilization pressure tank 11, the input of input channel 19 is communicated with the tower top of adsorption tower 3, output is communicated with packing type rectifying tower body 5, the input of mist output channel 21 is communicated with the top of First Heat Exchanger 8, and output is communicated with adsorption tower 3; Gas-liquid separator 15 is communicated with the sidepiece of upper condenser/evaporator 4 with the bottom of lower condenser/evaporator 6 respectively, and the sidepiece of lower condenser/evaporator 6 is communicated with nitrogen input pipe 17.
The first program-controlled valve assembly that described molecular sieve adsorption unit is connected with pipeline enclosure by adsorption tower 3 and adsorption tower forms, and realizes the opening and closing of valve by controller.Each adsorption tower 3 adopts connection arranged side by side, and install some first program-controlled valves according to timing requirements, realized the open and close of valve by controller, several adsorption tower 3 staggers mutually in time, and alternating sorbent can realize the object being continuously separated purification.
Hold liquid methane place in described lower condenser/evaporator 6 and be communicated with liquid methane groove 22.Liquid methane after purification enters into liquid methane groove 22.
The filter 23 of the dust filtered in gas-liquid mixture is provided with between the input of described input channel 19 and adsorption tower 3.
Electric heater 24 is provided with between the output of described mist output channel 21 and adsorption tower 3.
Mist output channel 21 between described main heat exchanger 7 and electric heater 24, nitrogen input pipe 17 between gas-liquid separator 15 and nitrogen heat exchanger 14, the pipeline that gas-liquid separator 15 is communicated with the bottom of lower condenser/evaporator 6, the pipeline that gas-liquid separator 15 is communicated with upper condenser/evaporator 4, the pipeline that nitrogen input pipe 17 is communicated with the sidepiece of lower condenser/evaporator 6, the pipeline that nitrogen efferent duct 16 is communicated with pure gas output channel 20 and the pipeline that input channel 19 is communicated with packing type rectifying tower body 5 are respectively equipped with the second program-controlled valve assembly, and the opening and closing of valve are realized by controller.
Rubbish rubbish landfill gas after purification is stored in rubbish landfill gas vacuum tank 1, required pressure is compressed to by garbage loading embeading air compressor 2, then molecular sieve adsorption unit is entered into, remove carbon dioxide and the water of trace in gas, guarantee that pure gas participates in cryogenic rectification, when the carbon dioxide that one of them adsorption tower 3 of molecular sieve adsorption unit absorbs and water are about to be in saturation state, are switched to another adsorption tower 3 by controller and work on.At normal temperature molecular sieve adsorption unit removing carbon dioxide and water, the clean gas of dust granules of going out in filter 23 enters into main heat exchanger 7 and after being cooled into gas-liquid mixture (wherein clean gas part methane gas is liquefied), packing type rectifying tower body 5 is entered through input channel 19, the saturated nitrogen of thermal source in low-temperature receiver liquid nitrogen in recycling in condenser/evaporator 4 and lower condenser/evaporator 6 carries out the exchange of energy, in this process, fractional saturation nitrogen is condensed into liquid nitrogen and flow in gas-liquid separator 15 from the below of the dividing plate 10 of lower condenser/evaporator 6, part liquid nitrogen is gasificated into nitrogen, and by below the control of the evaporating temperature of liquid nitrogen at the process conditions corresponding methane liquefaction temperature, guarantee that the whole condensate liquid of methane gas in gas-liquid mixture changes into methane liquid, finally above the dividing plate 10 of lower condenser/evaporator 6, obtain highly purified liquid methane, through Cemented filling in liquid methane groove 22.The nitrogen that the nitrogen of other liquefaction that are not condensed in gas-liquid mixture, hydrogen, oxygen and part liquid nitrogen are gasificated into enters in mist output channel 21 from First Heat Exchanger 8, wherein a part of emptying, remainder flow in electric heater 24 and carries out activating and regenerating to the adsorption tower being in saturation state after heating, and circulating with this realizes the continuous operation of molecular sieve adsorption unit.
Low-temperature receiver required in cryogenic rectification extracting liq methane process and thermal source provide by nitrogen refrigerating cycle unit, nitrogen enters nitrogen compressor 12 by nitrogen stabilization pressure tank 11, cooler 13 and nitrogen heat exchanger 14 is entered into successively after being compressed into authorized pressure, after nitrogen is cooled to set point of temperature in nitrogen heat exchanger 14, extraction major part is sent to decompressor 18 and does swell refrigeration, nitrogen after swell refrigeration is divided into two-way in proportion, wherein a road returns nitrogen heat exchanger 14, and another road enters main heat exchanger 7 and cools the clean gas after purification, the nitrogen that remainder does not enter decompressor 18 is cooled to saturation state always in nitrogen heat exchanger 14, saturated nitrogen is divided into two-way more in proportion, wherein a road is as thermal source, part of heat energy is condensed into liquid and enters into gas-liquid separator 15, the saturated nitrogen in another road directly enters gas-liquid separator 15 and converges with liquid nitrogen, the gas phase nitrogen be not liquefied in gas-liquid separator 15 mixes with the nitrogen after expansion and pro rata distributes, entering respectively after nitrogen heat exchanger 14 and main heat exchanger 7 carry out cold recovery returns in nitrogen stabilization pressure tank 11, the liquid nitrogen of gas-liquid separator 15 is back in condenser/evaporator 4, as the low-temperature receiver of upper condenser/evaporator 4.Though the nitrogen in system is circulation use, in longtime running, have leakage loss, void is supplemented depending on actual condition.In device, the pro rate of gas is all controlled by controller.
Claims (6)
1. to purify from the rubbish landfill gas after purification the device of methane liquid, it is characterized in that: it comprises pretreatment unit, molecular sieve adsorption unit, main heat exchanger, low-temperature fractionating tower, nitrogen refrigerating cycle unit and controller; Wherein,
Pretreatment unit, comprises the rubbish landfill gas vacuum tank and garbage loading embeading air compressor that connect successively;
Molecular sieve adsorption unit, by the carbon dioxide in multiple absorption tower adsorbs rubbish landfill gas composed in parallel and water, is communicated with the garbage loading embeading air compressor in described pretreatment unit at the bottom of the tower of adsorption tower;
Low-temperature fractionating tower, is made up of upper condenser/evaporator, packing type rectifying tower body and lower condenser/evaporator;
Nitrogen refrigerating cycle unit is communicated with main heat exchanger;
One end of described main heat exchanger is communicated with the tower top of molecular sieve adsorption unit adsorption tower, and the other end of main heat exchanger is communicated with the upper condenser/evaporator in low-temperature fractionating tower, packing type rectifying tower body;
First Heat Exchanger is provided with, the dividing plate being provided with the second heat exchanger in lower condenser/evaporator and being separated with liquid methane by liquid nitrogen in described upper condenser/evaporator; Described nitrogen refrigerating cycle unit forms by forming the nitrogen stabilization pressure tank in loop, nitrogen compressor, cooler, nitrogen heat exchanger and gas-liquid separator, nitrogen efferent duct and nitrogen input pipe is provided with in described nitrogen heat exchanger, be provided with decompressor between nitrogen input pipe and nitrogen efferent duct, decompressor be connected with the brake controlling decompressor rotating speed; Input channel, pure gas output channel and mist output channel is provided with in described main heat exchanger, the input of pure gas output channel is connected with nitrogen efferent duct, output is communicated with nitrogen stabilization pressure tank, the input of input channel is communicated with the tower top of adsorption tower, output is communicated with packing type rectifying tower body, the input of mist output channel is communicated with the top of First Heat Exchanger, and output is communicated with adsorption tower; Gas-liquid separator is communicated with the sidepiece of upper condenser/evaporator with the bottom of lower condenser/evaporator respectively, and the sidepiece of lower condenser/evaporator is communicated with nitrogen input pipe.
2. the device of methane liquid of purifying from the rubbish landfill gas after purification according to claim 1, it is characterized in that: the first program-controlled valve assembly that described molecular sieve adsorption unit is connected with pipeline enclosure by adsorption tower and adsorption tower forms, and realizes the opening and closing of valve by controller.
3. the device of methane liquid of purifying from the rubbish landfill gas after purification according to claim 1, is characterized in that: hold liquid methane place in described lower condenser/evaporator and be communicated with liquid methane groove.
4. the device of methane liquid of purifying from the rubbish landfill gas after purification according to claim 1, is characterized in that: the filter being provided with the dust filtered in gas-liquid mixture between the input of described input channel and adsorption tower.
5. the device of methane liquid of purifying from the rubbish landfill gas after purification according to claim 1, is characterized in that: be provided with electric heater between the output of described mist output channel and adsorption tower.
6. the device of methane liquid of purifying from the rubbish landfill gas after purification according to claim 5, it is characterized in that: the mist output channel between described main heat exchanger and electric heater, nitrogen input pipe between gas-liquid separator and nitrogen heat exchanger, the pipeline that gas-liquid separator is communicated with the bottom of lower condenser/evaporator, the pipeline that gas-liquid separator is communicated with upper condenser/evaporator, the pipeline that nitrogen input pipe is communicated with the sidepiece of lower condenser/evaporator, the pipeline that nitrogen efferent duct is communicated with pure gas output channel and the pipeline that input channel is communicated with packing type rectifying tower body are respectively equipped with the second program-controlled valve assembly, and the opening and closing of valve are realized by controller.
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| CA2855383C (en) | 2014-06-27 | 2015-06-23 | Rtj Technologies Inc. | Method and arrangement for producing liquefied methane gas (lmg) from various gas sources |
| CA2903679C (en) | 2015-09-11 | 2016-08-16 | Charles Tremblay | Method and system to control the methane mass flow rate for the production of liquefied methane gas (lmg) |
| CN108046972A (en) * | 2017-12-18 | 2018-05-18 | 合肥海川石化设备有限公司 | A kind of novel high purity methane purifying plant |
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