CN109880652A - Heat integration energy recycling system between a kind of Water gas shift/WGS and methanation unit - Google Patents
Heat integration energy recycling system between a kind of Water gas shift/WGS and methanation unit Download PDFInfo
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Abstract
Heat integration energy recycling system between a kind of Water gas shift/WGS and methanation unit, including sequentially connected WGS unit, methanation unit；WGS unit includes being sequentially connected the gas-gas heat exchanger connect, becoming furnace module, main transformer furnace, feedwater preheater component, cooling component in advance；Boiler water-suppling heater is provided in methanation unit；Feedwater preheater component heat is recycled after by boiler blow-down water by boiler water-suppling heater of the pipeline into methanation unit, water supply is continued the high pressure superheated steam that reaction heat is recovered as 9.8MPa by boiler water-suppling heater by methanation unit.The present invention has many advantages, such as to effectively improve heat recovery efficiency, realizes cascaded utilization of energy, improves energy utilization efficiency.The invention belongs to the energy and chemical technology field.
Description
Technical field
The invention belongs to the energy and chemical technology field, in particular to a kind of Water gas shift/WGS and methanation unit heat integration
Energy recycling system.
Background technique
The research of previous natural gas from coal energy system optimization is concentrated mainly on unit process and local system level, these
System and method are not utilized there are also many energy on the whole, not high to the utilization efficiency of energy.With natural gas from coal energy conservation
The deep expansion of work, more and more researchers and engineers and technicians recognize that the global optimization of energy system is to realize
The essential approach of integral energy utilization efficiency.Therefore, it is necessary to which natural gas from coal global system is carried out as organic whole
" cascade utilization " and energy of energy.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of higher Water gas shift/WGS of integral energy utilization efficiency and methanation list
First heat integration energy recycling system.
A kind of Water gas shift/WGS and methanation unit heat integration energy recycling system, including sequentially connected Water gas shift/WGS
Unit, methanation unit；WGS unit includes being sequentially connected the gas-gas heat exchanger connect, becoming furnace module, main transformer furnace, pot in advance
Furnace feed-water preheating device assembly, cooling component；Boiler water-suppling heater is provided in methanation unit；Feedwater preheater component
Boiler blow-down water is passed through into boiler water-suppling heater of the pipeline into methanation unit, methanation list after recycling to heat
Water supply is continued the high pressure superheated steam that reaction heat is recovered as 9.8MPa by boiler water-suppling heater by member.
Further, feedwater preheater component includes feedwater preheater one, feedwater preheater two, main transformer
The exit of furnace is connected with the access port of feedwater preheater one, and the first exit of feedwater preheater one and boiler are given
Water preheater two connects, and the second exit of feedwater preheater one is connected with the second access port of gas-gas heat exchanger；Main transformer
Conversion gas of the furnace after one heat exchange of feedwater preheater inputs feedwater preheater two, gas-gas heat exchanger respectively, transformation
215 DEG C to 280 DEG C of heat is used for the preheating of unstripped gas at gas-gas heat exchanger in gas, 175 DEG C to 280 DEG C of heat in conversion gas
Amount is used to preheat superpressure boiler water supply at feedwater preheater two, to realize the cascade utilization of energy.
Further, chiller assembly include be sequentially connected the forecooler one connect, forecooler two, intercooler, eventually it is cold
Device；Forecooler one, forecooler two are provided with boiler feedwater, and the conversion gas after feedwater preheater component recycles heat is again
For heating boiler feed water.
Further, forecooler one, the boiler feedwater in forecooler two are passed through recuperation of heat, then are passed to pre- through boiler feedwater
Hot device two and feedwater preheater one and the variation gas of main transformer furnace out exchange heat, the boiler blow-down water conveying that 263.5 DEG C of by-product
To the high pressure boiler water supply in methanation unit.
Further, in methanation unit, low-temp methanol is washed workshop section and is connected with feed preheater, feed preheater and original
Expect that knockout drum connection, the outlet of raw material knockout drum are connected with the import of desulfurizer, the outlet of desulfurizer passes through pipeline
It is connected with the first import of third feed preheater；The first outlet of third feed preheater is anti-with first a large amount of methanations respectively
Answer device, second a large amount of methanator connections, the import of first a large amount of methanators, second a large amount of methanators
It is connected respectively with the first outlet of third feed preheater；The outlet of first a large amount of methanators and the first methanation boiler
Import connection；The outlet of first methanation boiler is incorporated to through pipeline and is connected to second largely by the outlet of third feed preheater
On the pipeline of the import of methanator；The outlet of second a large amount of methanators is connected with the import of steam superheater,
The outlet of steam superheater is connected with the import of the second methanation boiler, the outlet of the second methanation boiler and circulating air heat exchanger
Import connection；The outlet of circulating air heat exchanger supplements methanator with the first boiler water-suppling heater, first respectively
Import connection；And the first boiler water-suppling heater outlet, desalination water heater, circulation knockout drum, recycle gas compressor according to
It is secondary to be connected by pipeline；The outlet of recycle gas compressor is incorporated to by pipeline is connected to first by the outlet of third feed preheater
On the pipeline of the import of a large amount of methanators；The of the outlet of first supplement methanator and third feed preheater
Two imports connection, the second outlet of third feed preheater are connected with the second import of the second feed preheater, and the second raw material is pre-
The second outlet of hot device is connected through the import of pipeline and the second boiler water-suppling heater；The outlet of second boiler water-suppling heater,
Separator, air cooler, knockout drum, heat exchanger, the second supplement methanator are sequentially connected；Second supplement methanation is anti-
The outlet of device is answered to connect with the second import of heat exchanger, the second outlet of heat exchanger, SNG cooler, compressor, end air cooler
It is sequentially connected.
Further, feed preheater includes the first feed preheater and the second feed preheater；First feed preheater
The first import wash workshop section with low-temp methanol and connect, the first of the first outlet of the first feed preheater and the second feed preheater
Import connection, the first outlet of the second feed preheater are connected with the import of raw material knockout drum.
Further, change furnace module includes pre- change furnace one, pre- change furnace two in advance；The first interface of gas-gas heat exchanger passes through pipeline
It is connected respectively with pre- change furnace one, the pre- access port for becoming furnace two；The pre- exit for becoming furnace one, becoming furnace two in advance is connected in parallel by pipeline
It is connected afterwards with the access port of main transformer furnace.
Further, further include drum, drum respectively with the first methanation boiler, steam superheater, the second methanation pot
Furnace connection.
Heat integration refers to the Optimized Matching that hot and cold stream is carried out between multiple devices or unit between device, avoids single device
Or it is saved simultaneously in unit since the big limitation of heat transfer temperature difference and intermediate stream repeat to cool and heat bring thermal loss
Hot and cold public work load, reduces from source and eliminates the generation of low temperature exhaust heat, to improve device or unit recycling energy
The efficiency of power.The present invention is by proposing Water gas shift/WGS on the basis of to existing natural gas from coal Process Energy network analysis
Unit and methanation unit carry out the recycling of energy by heat integration between device, so that improving Process Energy recycles efficiency.
Beneficial effects of the present invention: the present invention is by being directly used in pot for the heat of conversion gas in WGS unit
Furnace return water recycles heat, then the boiler blow-down water after recycling heat is transmitted to the high pressure boiler water supply in methanation unit, methane
Change the high-pressure boiler in unit and continue heat recovery, the water supply of 9.8MPa superpressure boiler is preheated, for generating 9.8MPa high
Steam is pressed, 9.8MPa extra high pressure steam is increased to by 5.0MPa high steam, although the yield of steam is suitable, unit superelevation
It presses the calorific value of steam to be higher than high steam calorific value, therefore recuperation of heat effect can be effectively improved by heat integration between device unit
Rate, to improve energy utilization efficiency, energy consumption is advanced optimized；Main transformer furnace is through feedwater preheater one in the present invention
Conversion gas is respectively connected to gas-gas heat exchanger, feedwater preheater two, and 215 DEG C to 280 DEG C of heat is changed in gas gas in conversion gas
The preheating of unstripped gas is used at hot device.175 DEG C to 280 DEG C of heat is at feedwater preheater two for preheating in conversion gas
Superpressure boiler water supply, thus realize the cascade utilization of energy, it is higher to the utilization efficiency of energy.
Detailed description of the invention
Fig. 1 is the process flow chart of water-gas change unit.
Wherein, 1- gas-gas heat exchanger, 2- become furnace one in advance, and 3- becomes furnace two in advance, 4- main transformer furnace, 5- feedwater preheater one,
6- feedwater preheater two, 7- forecooler one, 8- forecooler two, 9- intercooler, 10- end cooler.
Fig. 2 is the process flow chart of methanation unit.
Wherein, the first feed preheater of 1-, the second feed preheater of 2-, 3- raw material knockout drum, 4- desulfurizer, 5-
Three feed preheaters, a large amount of methanators of 6- first, 7- the first methanation boiler, a large amount of methanators of 8- second,
9- steam superheater, 10- the second methanation boiler, 11- drum, 12- circulating air heat exchanger, 13- recycle gas compressor, 14- are followed
Ring knockout drum, 15- desalination water heater, the first boiler water-suppling heater of 16-, 17- first supplement methanator,
The second boiler water-suppling heater of 18-, 19- knockout drum, 20- air cooler, 21- knockout drum, 22- heat exchanger, 23- second
Supplement methanator, 24-SNG cooler, 25- compressor, the end 26- air cooler.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawing.
A kind of higher Water gas shift/WGS of integral energy utilization efficiency and methanation unit heat integration energy recycling system packet
Include WGS unit and methanation unit.
WGS unit includes gas-gas heat exchanger, becomes furnace module, main transformer furnace, feedwater preheater one, boiler in advance
Feed water preheater two, cooling component.Pre- change furnace module includes pre- change furnace one, pre- change furnace two.Cooling component includes forecooler one, pre-
Cooler two, intercooler, whole cooler.The first interface of gas-gas heat exchanger becomes furnace one respectively and in advance by pipeline, becomes furnace two in advance
Access port connection；The pre- exit for becoming furnace one, becoming furnace two in advance is connected in parallel by pipeline to be connected with the access port of main transformer furnace afterwards；
The exit of main transformer furnace is connected by pipeline with the variation gas access port of feedwater preheater one, feedwater preheater one
Variation gas exit is connected by pipeline with the second access port of gas-gas heat exchanger.Second exit of gas-gas heat exchanger passes through pipe
Road is connected with the variation gas access port of feedwater preheater two, the variation gas exit of feedwater preheater two and raw gas
The first exit by pipeline it is in parallel after access cooling component.The boiler feedwater access port and boiler of feedwater preheater one
The boiler feedwater exit of feed water preheater two connects.The boiler feedwater access port of feedwater preheater two and one pot of forecooler
The connection of furnace water supply exit, the boiler feedwater after forecooler one to be recycled to heat are conveyed to feedwater preheater two.It is cooling
Component includes being sequentially connected the forecooler one connect, forecooler two, intercooler, whole cooler.The access port and pot of forecooler one
Pipeline connection after furnace feed water preheater two, raw gas are in parallel, the exit of forecooler one are connected with the access port of forecooler two,
The exit of forecooler two is connected with the access port of intercooler, the exit of intercooler and the access port with whole cooler
Connection, the exit of whole cooler is washed workshop section with low-temp methanol and is connected.Forecooler one, forecooler two, intercooler, whole cooler,
Low-temp methanol, which is washed between workshop section, is all made of pipeline connection.
Wherein, feedwater preheater component includes feedwater preheater one and feedwater preheater two；Boiler is given
Water heater includes the first boiler water-suppling heater and the second boiler water-suppling heater.
Methanation unit includes the first feed preheater, the second feed preheater, raw material knockout drum, desulfurizer, the
Three feed preheaters, first a large amount of methanators, the first methanation boiler, second a large amount of methanators, steam mistake
Hot device, the second methanation boiler, drum, circulating air heat exchanger, recycle gas compressor, circulation knockout drum, desalted water heating
Device, the first boiler water-suppling heater, first supplement methanator, the second boiler water-suppling heater, separator, air cooler,
Knockout drum, heat exchanger, the second supplement methanator, SNG cooler, compressor, end air cooler.Feed preheater
Including the first feed preheater and the second feed preheater.
First import of the first feed preheater is washed workshop section with low-temp methanol and is connected, with access through WGS unit,
Low-temp methanol washes the synthesis gas of workshop section.First import of the first outlet of the first feed preheater and the second feed preheater connects
It connects, the first outlet of the second feed preheater is connected with the import of raw material knockout drum by pipeline, raw material knockout drum
Outlet connect with the import of desulfurizer by pipeline, the outlet of desulfurizer pass through the first of pipeline and third feed preheater into
Mouth connection.The first outlet of third feed preheater respectively with first a large amount of methanators, second a large amount of methanation reactions
Device connection, the import of first a large amount of methanators, second a large amount of methanators pass through pipeline and third raw material respectively
The first outlet of preheater connects.The outlet of first a large amount of methanators connects through the import of pipeline and the first methanation boiler
It connects.The outlet of first methanation boiler is incorporated to that be connected to second a large amount of methanations by the outlet of third feed preheater anti-through pipeline
On the pipeline for answering the import of device.The outlet of second a large amount of methanators is connected through pipeline with the import of steam superheater, is steamed
The outlet of vapour superheater is connected with the import of the second methanation boiler, and the outlet of the second methanation boiler is changed through pipeline and circulating air
The import of hot device connects.The outlet of circulating air heat exchanger supplements methane with the first boiler water-suppling heater, first respectively through pipeline
Change the import connection of reactor.Wherein, the outlet of the first boiler water-suppling heater, desalination water heater, circulation knockout drum, follow
Ring air compressor passes sequentially through pipeline connection；The outlet of recycle gas compressor is incorporated to going out by third feed preheater by pipeline
On the pipeline for the import that mouth is connected to first a large amount of methanators.The outlet of first supplement methanator through pipeline and
Second import of third feed preheater connects, and the second outlet of third feed preheater is through pipeline and the second feed preheater
The second outlet of second import connection, the second feed preheater is connected through the import of pipeline and the second boiler water-suppling heater.The
The outlets of two boiler water-suppling heaters, separator, air cooler, knockout drum, heat exchanger, the second supplement methanator according to
It is secondary to be connected by pipeline.The outlet of second supplement methanator is connected through pipeline with the second import of heat exchanger, heat exchanger
Second outlet, SNG cooler, compressor, end air cooler pass sequentially through pipeline connection.
The recycling mouth of a river of feedwater preheater one, feedwater preheater two in WGS unit through pipeline and
First boiler water-suppling heater of methanation unit, the connection of the second boiler water-suppling heater, to realize WGS unit
Boiler blow-down water after middle recycling heat is used for the high pressure boiler water supply of methanation unit.
Drum is connected with the first methanation boiler, steam superheater, the second methanation boiler respectively.
It is as follows by the specific work process of this system: H2The raw gas that/CO is 2.7 and temperature is 176 DEG C is changed through gas gas
Hot device sequentially enters pre- change furnace module and main transformer furnace after being preheating to 260 DEG C, conversion reaction is exothermic reaction, the outlet temperature of main transformer furnace
Degree is up to 325 DEG C.The variation gas of main transformer furnace recycles heat, recycling through feedwater preheater one and feedwater preheater two again out
Boiler blow-down water after heat is used for the high pressure boiler water supply of methanation unit.The temperature for changing gas at this time is down to 176 DEG C, and unchanged
The raw gas of change enters subsequent cooling after entering mixer mixing together.Raw gas successively passes through forecooler one, forecooler respectively
Two, intercooler and whole cooler.In forecooler one, forecooler two, the waste heat of raw gas is used to heating boiler feed water, by pot
Furnace water supply is heated to 150 DEG C by 105 DEG C.The variation gas come out from whole cooler is synthesis gas after low-temp methanol washes workshop section.
In methanation unit, the synthesis gas washed from low-temp methanol is warming up to 141 DEG C by the first feed preheater,
Enter unstripped gas liquid knockout drum after the second feed preheater is warming up to 190 DEG C and carry out gas-liquid separation, to prevent the liquid in raw material
Body is brought in cleaning catalyst.Synthesis gas after separation enters desulfurizer desulfurization.Synthesis gas after desulfurization enters third raw material
Preheater, then 295 DEG C are further heated to by the first working off one's feeling vent one's spleen for methanator of supplement.Synthesis gas after preheating is divided into two
Stock enters first a large amount of methanators progress pyroreactions after one and the circulating air mixing from recycle gas compressor,
The reaction gas temperature of outlet is 640 DEG C, which is used to generate steam (342 DEG C) in the first methanation boiler.From
The process gas temperature opened is about 350 DEG C, and the gas and another stock are closed without the fresh feed of first a large amount of methanators
It is about 320 DEG C at temperature after (295 DEG C) of gas mixing, it is anti-to carry out further methanation into second a large amount of methanators
It answers.Major part CO is and H in second a large amount of methanators2Reaction generates methane.Leave second a large amount of methanation reactions
640 DEG C of high-temperature gases of device be first used in steam superheater to carry out steam overheat generate extra high pressure steam (450 DEG C~
540 DEG C) and generation steam (342 DEG C) in the second methanation boiler, then through circulating air heat exchanger heat cycles gas to 292 DEG C.
The hot gas left from circulating air heat exchanger is divided into two strands, and a stock-traders' know-how boiler water-suppling heater and the heat exchange of desalination water heater cool down
Enter circulating air liquid knockout drum afterwards, the gas after separating liquid is sent by recycle gas compressor to the first methanation boiler reactor.
Another strand of hot gas is directly entered the first supplement methanator and continues methanation reaction, and the high-temperature gas after reaction is introduced into
Third feed preheater and the second feed preheater preheat the fresh feed synthesis gas through device, then give through the second boiler
Water preheater further cools down.The gas-liquid mixture formed after cooling carries out gas-liquid separation in knockout drum.The gas isolated
It is mutually further cooled down through air cooler, gas-liquid mixture after cooling enters knockout drum and separated again.Gas after separation
It is anti-that body enters the second supplement methanator completion methanation after heat exchanger is warming up to 260 DEG C with thermal response gas converting heat
It answers, Outlet Gas Temperature is 352 DEG C, and gas exchanges heat through heat exchanger and the first feed preheater, then in SNG cooler
It is cooling with cooling water.Gas after cooling finally obtains synthetic natural gas through compressor and end air cooler.
In WGS unit, eliminate for generating the waste heat boiler of low-pressure steam in original process device, by this
For partial heat for preheating 9.8MPa superpressure boiler water supply, high pressure boiler water supply is sent to methanation unit.Main transformer outlet of still
High temperature heat is released, this is initially used for heating raw gas in original process, and according to folder point analysis, the partial heat is super for preheating
High pressure boiler water supply high temperature section can reduce heat transfer temperature difference, and 215 DEG C to 280 DEG C in conversion gas of heat is used for the pre- of unstripped gas
Heat.175 DEG C to 280 DEG C of heat is for preheating superpressure boiler water supply in conversion gas.In methanation unit, does not change and change
Ther mal network structure mainly changes the area of individual heat exchangers.By being transformed above, the grade of recovered steam is steamed by 5.0MPa high pressure
Vapour is increased to 9.8MPa extra high pressure steam, and the yield of steam is suitable.But the calorific value of unit extra high pressure steam is higher than high steam
Calorific value, therefore heat recovery efficiency can be effectively improved by heat integration between device.
Above-described embodiment is to invent preferable embodiment, but embodiments of the present invention are not by the limit of above-described embodiment
System, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (8)
1. heat integration energy recycling system between a kind of Water gas shift/WGS and methanation unit, it is characterised in that: including being sequentially connected
WGS unit, methanation unit；WGS unit includes being sequentially connected the gas-gas heat exchanger connect, pre- change furnace group
Part, main transformer furnace, feedwater preheater component, cooling component；Boiler water-suppling heater is provided in methanation unit；Boiler is given
Water preheater component is added boiler blow-down water by boiler feedwater of the pipeline into methanation unit after recycling to heat
Water supply is continued the high pressure superheater steaming that reaction heat is recovered as 9.8MPa by boiler water-suppling heater by hot device, methanation unit
Vapour.
2. heat integration energy recycling system, feature between a kind of Water gas shift/WGS and methanation unit according to claim 1
Be: feedwater preheater component includes feedwater preheater one, feedwater preheater two, the exit of main transformer furnace and
The variation gas access port of feedwater preheater one connects, the boiler feedwater access port of feedwater preheater one and boiler feedwater
The boiler feedwater exit of preheater two connects, change gas exit and gas-gas heat exchanger second of feedwater preheater one
Access port connection；Conversion gas of the main transformer furnace after one heat exchange of feedwater preheater input respectively feedwater preheater two,
Gas-gas heat exchanger, 215 DEG C to 280 DEG C of heat is used for the preheating of unstripped gas at gas-gas heat exchanger in conversion gas, in conversion gas
175 DEG C to 280 DEG C of heat is used to preheat superpressure boiler water supply at feedwater preheater two, to realize the step of energy
It utilizes.
3. heat integration energy recycling system, feature between a kind of Water gas shift/WGS and methanation unit according to claim 1
Be: chiller assembly includes being sequentially connected the forecooler one connect, forecooler two, intercooler, whole cooler；Forecooler one,
Forecooler two is provided with boiler feedwater, and the conversion gas after feedwater preheater component recycles heat is re-used for heating boiler
Water supply.
4. heat integration energy recycling system, feature between a kind of Water gas shift/WGS and methanation unit according to claim 3
Be: the boiler feedwater in forecooler one, forecooler two is by recuperation of heat, then passes to through feedwater preheater two and boiler
Feed water preheater one and the variation gas of main transformer furnace out exchange heat, and the boiler blow-down water that 263.5 DEG C of by-product is conveyed to methanation unit
In high pressure boiler water supply.
5. heat integration energy recycling system, feature between a kind of Water gas shift/WGS and methanation unit according to claim 1
Be: in methanation unit, low-temp methanol is washed workshop section and is connected with feed preheater, feed preheater and raw material knockout drum
Connection, the outlet of raw material knockout drum are connected with the import of desulfurizer, and the outlet of desulfurizer is pre- by pipeline and third raw material
First import of hot device connects；The first outlet of third feed preheater respectively with first a large amount of methanators, second largest
Measure methanator connection, first a large amount of methanators, second a large amount of methanators import respectively and third
The first outlet of feed preheater connects；The outlet of first a large amount of methanators and the import of the first methanation boiler connect
It connects；The outlet of first methanation boiler is incorporated to that be connected to second a large amount of methanations by the outlet of third feed preheater anti-through pipeline
On the pipeline for answering the import of device；The outlet of second a large amount of methanators is connected with the import of steam superheater, steam superheating
The outlet of device is connected with the import of the second methanation boiler, and the outlet of the second methanation boiler and the import of circulating air heat exchanger connect
It connects；The outlet of circulating air heat exchanger is connected with the import of the first boiler water-suppling heater, the first supplement methanator respectively；
And the first boiler water-suppling heater outlet, desalination water heater, circulation knockout drum, recycle gas compressor pass sequentially through pipeline
Connection；The outlet of recycle gas compressor is incorporated to by pipeline is connected to first a large amount of methanations by the outlet of third feed preheater
On the pipeline of the import of reactor；The outlet of first supplement methanator and the second import of third feed preheater connect
It connecing, the second outlet of third feed preheater is connected with the second import of the second feed preheater, and the of the second feed preheater
Import connection of two outlets through pipeline and the second boiler water-suppling heater；The outlet of second boiler water-suppling heater, separator, sky
Cooler, knockout drum, heat exchanger, the second supplement methanator are sequentially connected；Second supplement methanator goes out
Mouth is connected with the second import of heat exchanger, and the second outlet of heat exchanger, SNG cooler, compressor, end air cooler are sequentially connected.
6. heat integration energy recycling system, feature between a kind of Water gas shift/WGS and methanation unit according to claim 5
Be: feed preheater includes the first feed preheater and the second feed preheater；First import of the first feed preheater and
Low-temp methanol washes workshop section's connection, and the first outlet of the first feed preheater is connected with the first import of the second feed preheater, the
The first outlet of two feed preheaters is connected with the import of raw material knockout drum.
7. heat integration energy recycling system, feature between a kind of Water gas shift/WGS and methanation unit according to claim 1
Be: pre- change furnace module includes pre- change furnace one, pre- change furnace two；The first interface of gas-gas heat exchanger becomes furnace by pipeline respectively and in advance
One, become the access port connection of furnace two in advance；The pre- exit for becoming furnace one, becoming furnace two in advance is connected in parallel rear and main transformer furnace by pipeline
Access port connection.
8. heat integration energy recycling system, feature between a kind of Water gas shift/WGS and methanation unit according to claim 1
It is: further includes drum, drum is connected with the first methanation boiler, steam superheater, the second methanation boiler respectively.
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