CN109280570A - Gas-tight ring circulation comprehensive utilizes the technique for preparing natural gas after synthetic ammonia tower - Google Patents
Gas-tight ring circulation comprehensive utilizes the technique for preparing natural gas after synthetic ammonia tower Download PDFInfo
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- CN109280570A CN109280570A CN201811228431.8A CN201811228431A CN109280570A CN 109280570 A CN109280570 A CN 109280570A CN 201811228431 A CN201811228431 A CN 201811228431A CN 109280570 A CN109280570 A CN 109280570A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/04—Preparation of ammonia by synthesis in the gas phase
- C01C1/0405—Preparation of ammonia by synthesis in the gas phase from N2 and H2 in presence of a catalyst
- C01C1/0488—Processes integrated with preparations of other compounds, e.g. methanol, urea or with processes for power generation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The present invention relates to ring circulation comprehensives gas-tight after a kind of synthetic ammonia tower to utilize the technique for preparing natural gas, pneumatic transmission enters in low pressure ice chest after the low-pressure methane synthesis system tower that low-pressure methane synthesis system generates, the nitrogen injected simultaneously and into low pressure ice chest, the demethanation at low pressure and -85~-57 DEG C, residual gas is sent into reaction in synthesis ammonia system after six sections of high-pressure units compress and generates synthesis ammonia, it supervenes simultaneously by periodic off-gases, the unification of two gas of circulating air is at containing ammonia 3%, gas after the synthetic ammonia tower of methane 24%, pneumatic transmission enters the first high pressure cold box after synthetic ammonia tower, the deamination at high pressure and 109~-73 DEG C of ﹣, pneumatic transmission enters the second high pressure cold box after remaining synthetic ammonia tower, the nitrogen injected simultaneously into the second high pressure cold box, the demethanation at high pressure and 193~-129 DEG C of ﹣, methane is sent into storage in natural gas storage tank, it is surplus Residual air body is sent into synthesis ammonia system production synthesis ammonia by circulator.Design rationally, is skillfully constructed, and realizes the purpose of design of two product of a tower.
Description
Technical field
The present invention relates to synthesis ammonia technical fields, and in particular to gas-tight conjunctions circulation comprehensive is using preparing after a kind of synthetic ammonia tower
The technique of natural gas.
Background technique
Technology development rises from Nanjing Yong Lining factory, last 100 years history of having passed by so far；Ammonia synthesizing industry is basis
One of inorganic chemical industry, ammonia are the primary raw materials of chemical fertilizer industry and basic organic chemical industry, can be processed into nitric acid, modern chemistry work from ammonia
In industry, nitric acid production is often belonged into ammonia synthesizing industry scope.Ammonia synthesizing industry is formed early in the twentieth century, starts to make fire with ammonia
Arrow fuel, explosive industry raw material, be war service;After the World War I, turn to as agricultural, industrial service.With
Science and technology development, it is growing to the requirement of ammonia.The raw material of ammonia, which is constituted, after the fifties occurs great change, and nearly 30 years
Carrying out ammonia synthesizing industry have developed rapidly.
The existing coal manufacture synthesis ammonia of China, middle pressure combination methanol, connection urea (national standard) production line, mesolow one-step synthesis method
Pneumatic transmission enters synthesis ammonia system preparation synthesis ammonia and can not remove because there are methane in gas after tower after the tower of natural gas system, synthesizes
Ammonia system synthesizes ammonia and generates gas after the tower containing methane simultaneously, and the presence of methane influences the synthetic ratio of NH3, can only achieve 11.5%,
One tower only has a product, i.e. synthesis ammonia.
Summary of the invention
To solve the above problems, the present invention proposes after a kind of synthetic ammonia tower gas-tight conjunction circulation comprehensive using preparing natural gas
Technique, design rationally, are skillfully constructed, and construct whole closed operation system, and secondary injection nitrogen, double three temperature of pressure are double de-, remove back
Methane, liquefied ammonia are received, while adjusting the nitrogen hydrogen ratio after synthetic tower tower in gas is 1:2.5, so that secondary preparation NH3 unstripped gas, prevents
Synthetic tower in-fighting, dischargeable capacity rate restore 27%, and the one way synthetic ratio of ammonia increases to 20%, while recycling CH4, make synthetic tower
One way superposition synthetic ratio reaches 24% of gas after tower, increases production new energy products natural gas, realizes the design mesh of two product of a tower
's.
The technical solution of invention
The gas-tight circulation comprehensive that closes is using the technique for preparing natural gas after a kind of synthetic ammonia tower, using synthesis ammonia system, low-pressure methane
The closed circulating fortune that synthesis system, low pressure ice chest, the first high pressure cold box, the second high pressure cold box, six sections of high-pressure units connect and compose
Row system prepares natural gas；Low pressure ice chest is separately connected four sections of entrances of low-pressure methane synthesis system Yu six sections of high-pressure units, and six sections
Four sections of entrances of high-pressure unit connect nitrogen pipeline, and six sections of outlets of six sections of high-pressure units connect synthesis ammonia system, and synthesis ammonia system connects
The first high pressure cold box is connect, the first high pressure cold box connects the second high pressure cold box, and the second high pressure cold box connects synthesis ammonia by circulator
System, the second high pressure cold box connect nitrogen pipeline；The low pressure ice chest, the second high pressure cold box are separately connected natural gas storage tank,
First high pressure cold box connection synthesis ammonia storage tank；The cooling temperature of the low pressure ice chest is -85~-57 DEG C, the first high pressure cold box
Cooling temperature be 109~-73 DEG C of ﹣, the cooling temperature of the second high pressure cold box is 193~-129 DEG C of ﹣.
Processing step are as follows: the low pressure NH that low-pressure methane synthesis system generates3Pneumatic transmission enters in low pressure ice chest after synthesis material tower,
200 DEG C of ﹣ of nitrogen is injected into low pressure ice chest simultaneously, for note nitrogen for the first time, the demethanation at low pressure, -85~-57 DEG C, methane
It is sent into storage in methane storage tank, residual gas enters six sections of high pressures from four sections of entrances of six sections of high-pressure units as ammonia low pressure syn-gas
Machine compression, six sections of outlets for being re-fed into six sections of high-pressure units are delivered to reaction in synthesis ammonia system and generate synthesis ammonia and be sent into synthesis ammonia
Storage tank synthesizes ammonia for product, while supervening and being synthesized by periodic off-gases, the unification of circulating air two gas at containing ammonia 3%, methane 24%
Gas after ammonia tower, pneumatic transmission enters the first high pressure cold box after synthetic ammonia tower, the deamination at high pressure, 109~-73 DEG C of ﹣, and liquefied ammonia is sent into liquefied ammonia storage
It is stored in slot, pneumatic transmission enters the second high pressure cold box after remaining synthetic ammonia tower, while -200 DEG C of nitrogen is injected into the second high pressure cold box
Gas, for second of note nitrogen, the demethanation at high pressure, 193~-129 DEG C of ﹣, it is product day that methane, which is sent into storage in natural gas storage tank,
Right gas, residual gas is from 209-300kg/cm with pressure2Synthesis ammonia system production synthesis is sent by circulator as NH3 unstripped gas
Ammonia.
Remove after synthetic ammonia tower 3% ammonia and 24% methane in gas, avoid 3% ammonia and 24% methane again into
Enter in synthesis ammonia system, decomposed in synthesis ammonia system and then occupies certain synthesis ammonia convertor inner space, so that
The dischargeable capacity rate synthesized in ammonia convertor restores 27%；Methane is avoided to influence the synthetic ratio of synthesis ammonia；The common one way for realizing ammonia
Synthetic ratio increases to 20%；Using low pressure ice chest, the first high pressure cold box, the second high pressure cold box in -85~-57 DEG C, ﹣ 109~-73
DEG C, it is necessarily in vacuum state at 193~-129 DEG C of ﹣, so that the liquefied ammonia of removing, methane purity directly reach 400ppm, it is state
Mark first class product；Last NH3 unstripped gas is directly sent into synthesis ammonia system through circulator and is recycled, be not required to from pressure simultaneously
Repressurization is wanted, cost is reduced；It is sent into low pressure ice chest, the vaporization of the second high pressure cold box using 200 DEG C of ﹣ of nitrogen, plays acceleration drop
The effect of low pressure ice chest, temperature in the second high pressure cold box, another aspect liquid nitrogen vaporization are mixed with gas after tower, reach adjusting tower
Afterwards in gas nitrogen hydrogen than=unstripped gas of the 1:2.5 as NH3；Using aluminium wing designed for focusing liquefied natural gas, liquefied ammonia.
Above-mentioned technical proposal is improved further and is refined, it is the low pressure ice chest, the first high pressure cold box, second high
Pressing ice chest is seal case, and cabinet inner disc is provided around cooling tube, and aluminium wing, the cooling tube of low pressure ice chest are provided on cooling tube
One end connection liquid nitrogen inlet duct, cooling tube one end of the cooling tube other end the first high pressure cold box of connection of low pressure ice chest, first
The cooling tube other end of high pressure cold box connects one end of the second high pressure cold box, the other end connection liquid nitrogen outlet of the second high pressure cold box
Pipeline collectively forms circulating cooling system；Passed through in low pressure ice chest, the first high pressure cold box, the second high pressure cold box using liquid nitrogen
Cooling tube can be good at playing the role of cooling.
Above-mentioned technical proposal is improved further and is refined, it is the low pressure ice chest, the first high pressure cold box, second high
It presses and also sets up nozzle on the cooling tube of ice chest；And the detection of nitrogen hydrogen is respectively arranged in low pressure ice chest and the second high pressure cold box exit
Device, detect nitrogen hydrogen than it is unqualified when, open low pressure ice chest, the nozzle supplement injection nitrogen adjustment in the second high pressure cold box
Nitrogen hydrogen ratio, qualified nitrogen hydrogen ratio are 1:2.5.
Above-mentioned technical proposal is improved further and is refined, it is the low pressure ice chest, the first high pressure cold box, second high
Pressure ice chest is all made of Q235 or 304 stainless steels are made, and low pressure ice chest, the first high pressure cold box, the cooling tube of the second high pressure cold box are equal
It is made of Q235 or 304 stainless steels.
Above-mentioned technical proposal is improved further and is refined, the closed circulating operating system further includes three
Flash column, a flash column connection low pressure ice chest and natural gas storage tank, a flash column connect the first high pressure cold box and synthesis ammonia
Storage tank, a flash column connect the second high pressure cold box and natural gas storage tank；By the design stability temperature of flash column, further mention
The product hierarchy of high liquefied ammonia, methane.
Above-mentioned technical proposal is improved further and is refined, the low-pressure methane synthesis system is by pressing first in two
Alcohol synthetic tower is in series, and successively three sections of outlets with low pressure ice chest, six sections of high-pressure units connect；Middle pressure methyl alcohol synthetic reactor uses first
Alkane catalyst substitutes methanol catalyst；The middle pressure methyl alcohol synthetic reactor is the complete middle pressure methanol-fueled CLC of Nanjing chemical manufacture
Tower；The gas of three sections of six sections of high-pressure units outlet output in Fig. 2, pass sequentially through press methyl alcohol synthetic reactor secondary in concatenated two with
Methane catalyst in middle pressure methyl alcohol synthetic reactor contacts direct LP synthesizing methane, efficiently.
Above-mentioned technical proposal is improved further and is refined, the synthesis ammonia system is Nanjing chemical system
The Φ 1500 or the complete synthetic ammonia tower equipment of Φ 1200 made；Six sections of high-pressure units are raw for Shenyang Air-Compressor Manufactory
The M632 type high-pressure unit of production.
A kind of coal synthesis ammonia production-line technique, it includes the following steps:
(1) air separation with pressure is put forward into pure oxygen, nitrogen and product argon gas using space division system, pure oxygen, nitrogen are through liquefying
At product liquid oxygen, liquid nitrogen.
(2) feed coal, water are sent into the continuous wet type gas of pressurization static bed pure oxygen together with the pure oxygen that step (1) generates
Furnace, in 10~35kg/cm2, at 1250 DEG C reaction be produced from 1kg/cm with pressure2The hydrogeneous carbon containing noble and unsullied semiwater gas of height of height, and
400 DEG C -430 DEG C of the attached production steam of middle pressure collet.
(3) the noble and unsullied semiwater gas generated in step (2) is taken off by electric dust removing system dedusting, wet desulphurisation system desulfurization
Noble and unsullied semiwater gas after sulphur is sent into six sections of high-pressure units by one section of entrance of six sections of high-pressure units and is compressed, one section of inlet pressure
For 1kg/cm2；The sulphur that desulfurization generates is processed into commodity sulphur by the fixed system of processing of sulphur.
(4) the attached production steam of 400 DEG C -430 DEG C of the middle pressure collet of step (2) attached production is sent into steam generating system power generation, at
Commodity electricity, while electrical power generation steam and afterheat steam are generated, the pressurization that the afterheat steam steam of generation is sent into step (2) is fixed
Reaction water is supplemented in the bed continuous wet type producer of pure oxygen.
(5) the noble and unsullied semiwater gas of the compression exported from the second stage exit of six sections of high-pressure units in step (3) takes off CO2,CO2
Urea Conversion System synthesis is sent into together with the electrical power generation steam that step (4) generate, partially synthetic ammonia made of synthesis ammonia system 11
Urea is simultaneously sent into urea reservoir area, is product urea；It is that CO2 is sent into six sections of high pressures that residual air after de- CO2, which is sent into change furnace transformation CO,
Three sections of entrances of machine.
(6) low-pressure methane synthesis system is sent into from the gas of three sections of outlet outputs of six sections of high-pressure units in step (5) to close
At methane, and it is sent into natural gas storage tank, is product natural gas, while attached production low pressure NH3 synthetic raw gas, low pressure NH3 synthesis are former
Expect that gas contains the methane less than or equal to 0.5%.
(7) gas gas-tight conjunction circulation comprehensive after above-mentioned synthetic ammonia tower after the low pressure NH3 synthesis material tower that step (6) generates
Using the technique for preparing natural gas, product natural gas and synthesis ammonia are produced.
The efficient utilization of feed coal is realized in the totally-enclosed operation of set of system, is generated eight kinds of effective products, is substantially increased original
The utilization rate for expecting coal, avoids the waste of resource, and production process zero-emission；Pressurization static bed pure oxygen in step (2) connects
Furnace gas (noble and unsullied semiwater gas) effective rate of utilization that continuous wet type producer generates is 100%, infuses nitrogen twice and non-furnace gas is added
(nitrogen) effective rate of utilization is 33.3% so that carbon, hydrogen, nitrogen proportion can just whole synthesizing methanes, synthesis ammonia, effective commodity
Synthetic ratio reaches 133.3%.The production capacity of synthesis ammonia, and newly-increased product liquefied natural gas is greatly improved.
Above-mentioned technical proposal is improved further and is refined, the pressurization static bed pure oxygen described in step (2) connects
Continuous wet type producer is consistent with the gas generator structure that Jiangxi Changyi Industrial Co., Ltd. produces, including furnace body, furnace body it is straight
The height of 3.1 times of the diameter for the gas generator that diameter produces for Jiangxi Changyi Industrial Co., Ltd., furnace body and jacket boiler is same
Than increasing, and secondary steam heating pressurization coil pipe is had additional at the top of furnace body；Mixed using pure oxygen with vapor pressurization 10~
35kg/cm2The production efficiency of noble and unsullied semiwater gas is improved, reaches 10,000-1.2 ten thousand m per hour3。
Above-mentioned technical proposal is improved further and is refined, the space division system is that Hangzhou is empty in step (1)
28,000,000 m3/h type (liquid oxygen), 40,000,000 m3/h type (liquid nitrogen) the synthesis ammonia for dividing (oxygen) Group Co., Ltd to manufacture is dedicated
Complete air separation plant；The electric dust removing system is the X- that Shenyang motor equipment chemical plant is manufactured in step (3)
80000m3/h type synthesizes the dedicated complete cleaner of ammonia, and wet type desufurization system is Shenyang motor equipment chemical plant production system
The synthesis dedicated complete wet desulfurizing unit of ammonia is made, sulphur solid system of processing is that conjunction is manufactured in Shenyang motor equipment chemical plant
The dedicated complete sulphur solid process equipment of ammonification；The steam generating system described in step (4) is Shenyang (power station) boiler
The circulating fluidized bed boiler of the 75T/h of factory's manufacture and the liquid structure complete set of equipments of 160,000 T/ are constituted；In step (5)
The Urea Conversion System is that the complete ammonia for 130,000 T/ that Mitsui industry Co., Ltd. manufactures proposes gas equipment.
The invention has the advantages that design is rationally, it is skillfully constructed, constructs whole closed operation system, secondary injection nitrogen, double pressures
Three temperature are double de-, removing recycling methane, liquefied ammonia, while the nitrogen hydrogen ratio adjusted after synthetic tower tower in gas is 1:2.5 to secondary preparation
NH3 unstripped gas has prevented synthetic tower in-fighting, and dischargeable capacity rate restores 27%, and the one way synthetic ratio of ammonia increases to 20%, returns simultaneously
CH4 is received, the 24% of gas, increases production new energy products natural gas, realize a tower two after so that synthetic tower one way superposition synthetic ratio is reached tower
The purpose of design of product.
Detailed description of the invention
Fig. 1 is the gas-tight process flow chart for closing circulation comprehensive utilization and preparing natural gas after synthetic ammonia tower.
Fig. 2 is the process flow chart of coal synthesis ammonia production-line technique.
Fig. 3 circulating cooling system connection schematic diagram.
In figure: space division system 1, the pressurization static bed continuous wet type producer 2 of pure oxygen, electric dust removing system 3, wet type desulfurizing 4, six
Section high-pressure unit 8, the fixed system of processing 5 of sulphur, low-pressure methane synthesis system 10, steam generating system 6, change furnace 7, urea synthesizing
System 9, synthesis ammonia system 11, the first high pressure cold box 13, the second high pressure cold box 14, low pressure ice chest 12, circulator 15.
Specific embodiment
As shown in Figure 1, gas-tight ring circulation comprehensive is using the technique for preparing natural gas after a kind of synthetic ammonia tower, using synthesis ammonia
14, six sections of system 11, low-pressure methane synthesis system 10, low pressure ice chest 12, the first high pressure cold box 13, the second high pressure cold box high-pressure units
The 8 closed circulating operating systems connected and composed prepare natural gas；Low pressure ice chest 12 is separately connected low-pressure methane synthesis system 10
With four sections of entrances of six sections of high-pressure units 8, four sections of entrances of six sections of high-pressure units 8 connect nitrogen pipeline, and six sections of six sections of high-pressure units 8 go out
Mouth connection synthesis ammonia system 11, synthesis ammonia system 11 connect the first high pressure cold box 13, and the first high pressure cold box 13 connects the second high pressure
Ice chest 14, the second high pressure cold box 14 connect synthesis ammonia system 11 by circulator 15, and the second high pressure cold box 14 connects nitrogen pipeline；
The low pressure ice chest 12, the second high pressure cold box 14 are separately connected natural gas storage tank, the connection synthesis ammonia storage of the first high pressure cold box 13
Slot；The cooling temperature of the low pressure ice chest 12 is -85~-57 DEG C, and the cooling temperature of the first high pressure cold box 13 is ﹣ 109~-73
DEG C, the cooling temperature of the second high pressure cold box 14 is 193~-129 DEG C of ﹣；The closed circulating operating system further includes three
Flash column, a flash column connection low pressure ice chest and natural gas storage tank, a flash column connect the first high pressure cold box and synthesis ammonia
Storage tank, a flash column connect the second high pressure cold box and natural gas storage tank；By the design stability temperature of flash column, further mention
The product hierarchy of high liquefied ammonia, methane；The low pressure ice chest 12, the first high pressure cold box 13, the second high pressure cold box 14 are sealing
Cabinet, cabinet inner disc are provided around cooling tube, and aluminium wing is provided on cooling tube, and cooling tube one end of low pressure ice chest 12 connects liquid nitrogen
Inlet duct, the cooling tube other end of low pressure ice chest 12 connect cooling tube one end of the first high pressure cold box 13, the first high pressure cold box
The 13 cooling tube other end connects one end of the second high pressure cold box 14, and the other end of the second high pressure cold box 14 connects liquid nitrogen outlet
Road collectively forms circulating cooling system；Pass through low pressure ice chest 12, the first high pressure cold box 13, the second high pressure cold box 14 using liquid nitrogen
In cooling tube, can be good at playing the role of cooling；Using aluminium wing designed for focusing methane, synthesis ammonia；Described is low
It presses and also sets up nozzle on the cooling tube of ice chest 12, the first high pressure cold box 13, the second high pressure cold box 14；And in low pressure ice chest 12 and
Two high pressure cold box, 14 exit is respectively arranged with nitrogen hydrogen detection device, detect nitrogen hydrogen than it is unqualified when, open low pressure ice chest
12, the nozzle supplement injection nitrogen in the second high pressure cold box 14 adjusts nitrogen hydrogen ratio, and qualified nitrogen hydrogen ratio is 1:2.5；The low pressure
Methane synthesis system 10 by two press methyl alcohol synthetic reactor it is in series, successively with three sections of 12, six sections of high-pressure units 8 of low pressure ice chest
Outlet connection；Middle pressure methyl alcohol synthetic reactor substitutes methanol catalyst using methane catalyst；The middle pressure methyl alcohol synthetic reactor is Nanjing
The complete middle pressure methyl alcohol synthetic reactor of work machinery plant manufacture；The gas of three sections of outlet output of six sections of high-pressure units 8, passes sequentially through series connection
Two in pressure methyl alcohol synthetic reactor it is secondary with it is middle pressure methyl alcohol synthetic reactor in methane catalyst contact direct LP synthesizing methane, height
Effect；The synthesis ammonia system 11 is the Φ 1500 or the complete synthetic ammonia tower equipment of Φ 1200 of Nanjing chemical manufacture；Institute
The six sections of high-pressure units 8 stated are the M632 type high-pressure unit of Shenyang Air-Compressor Manufactory's production.
Processing step are as follows: pneumatic transmission enters low pressure ice chest after the low-pressure methane synthesis system tower that low-pressure methane synthesis system 10 generates
In 12, and -200 DEG C of nitrogen is injected into low pressure ice chest 12, for note nitrogen for the first time, the demethanation at low pressure, -85~-57 DEG C,
Methane is sent into storage in methane storage tank, and residual gas enters six from four sections of entrances of six sections of high-pressure units 8 as ammonia low pressure syn-gas
Section high-pressure unit 8 compresses, and six sections of outlets for being re-fed into six sections of high-pressure units 8 are delivered to reaction in synthesis ammonia system 11 and generate synthesis ammonia simultaneously
It is sent into synthesis ammonia storage tank, synthesizes ammonia for product, while being supervened by periodic off-gases, the unification of two gas of circulating air at containing ammonia 3%, methane
Gas after 24% synthetic ammonia tower, pneumatic transmission enters the first high pressure cold box 13 after synthetic ammonia tower, the deamination at high pressure, 109~-73 DEG C of ﹣, liquid
Ammonia is sent into storage in storage of described liquefied ammonia, and pneumatic transmission enters the second high pressure cold box 14 after remaining synthetic ammonia tower, while to the second high pressure cold box 14
The nitrogen of interior -200 DEG C of injection, for second of note nitrogen, the demethanation at high pressure, 193~-129 DEG C of ﹣, methane is sent into natural gas storage
It is stored in slot, is product natural gas, residual gas is used as NH3 unstripped gas to be sent into synthesis ammonia system life by circulator 15 from pressure
Produce synthesis ammonia.
A kind of coal synthesis ammonia production-line technique, it includes the following steps:
(1) air separation with pressure is put forward into pure oxygen, nitrogen and product argon gas using space division system 1, pure oxygen, nitrogen are through liquefying
At product liquid oxygen, liquid nitrogen.
(2) feed coal, water are sent into the continuous wet type producer of pressurization static bed pure oxygen together with the pure oxygen that step (1) generates
2, in 10~35kg/cm2, at 1250 DEG C reaction be produced from 1kg/cm with pressure2The hydrogeneous carbon containing noble and unsullied semiwater gas of height of height, and
400 DEG C -430 DEG C of the attached production steam of middle pressure collet.
(3) the noble and unsullied semiwater gas generated in step (2) passes through 3 dedusting of electric dust removing system, 4 desulfurization of wet desulphurisation system,
Noble and unsullied semiwater gas after desulfurization is sent into six sections of high-pressure units 8 by one section of entrance of six sections of high-pressure units 8 and is compressed, one section of entrance
Pressure is 1kg/cm2；The sulphur that desulfurization generates is processed into commodity sulphur by the fixed system of processing of sulphur.
(4) the attached production steam of 400 DEG C -430 DEG C of the middle pressure collet of step (2) attached production is sent into steam generating system 6 and generates electricity, at
Commodity electricity, while electrical power generation steam and afterheat steam are generated, the afterheat steam of generation is sent into pressurization static bed pure in step (2)
Reaction water is supplemented in the continuous wet type producer 2 of oxygen.
(5) the noble and unsullied semiwater gas of the compression exported from the second stage exit of six sections of high-pressure units 8 in step (3) takes off CO2,CO2
Urea Conversion System synthesis is sent into together with the electrical power generation steam that step (4) generate, partially synthetic ammonia made of synthesis ammonia system 11
Urea is simultaneously sent into urea reservoir area, is product urea；It is that CO2 is sent into six sections of high pressures that residual air after de- CO2, which is sent into change furnace 7 and converts CO,
Three sections of entrances of machine 8.
(6) low-pressure methane synthesis system 10 is sent into from the gas of three sections of outlet outputs of six sections of high-pressure units 8 in step (5)
Synthesizing methane, and be sent into natural gas storage tank, is product natural gas, while attached production low pressure NH3Synthetic raw gas, low pressure NH3Methane closes
Contain the methane less than or equal to 0.5% at unstripped gas.
(7) gas gas closed circulation after above-mentioned synthetic ammonia tower is comprehensive after the low-pressure methane synthesis system tower that step (6) generates
It closes and utilizes the technique for preparing natural gas, production product natural gas and synthesis ammonia.
The continuous wet type producer 2 of the pressurization static bed pure oxygen described in step (2) and Jiangxi Changyi Industrial Co., Ltd.
The gas generator structure of production is consistent, including furnace body, and the diameter of furnace body is the coal gas of Jiangxi Changyi Industrial Co., Ltd.'s production
The height of 3.1 times of producer diameter, furnace body and jacket boiler increases on year-on-year basis, and secondary steam heating is had additional at the top of furnace body
It is pressurized coil pipe；According to the practical report of Oxford laboratory nitrogen hydrogen, 10~35kg/cm of pressurization is mixed with vapor using pure oxygen2It improves
The production efficiency of noble and unsullied semiwater gas reaches 10,000-1.2 ten thousand m per hour3。
The space division system is 28,000,000 that space division (oxygen) Group Co., Ltd in Hangzhou manufactures in step (1)
40,000,000 m3/h type (liquid nitrogen) of m3/h type (liquid oxygen) synthesizes the dedicated complete air separation plant of ammonia；The electricity removes in step (3)
Dirt system is that the X-80000m3/h type that Shenyang motor equipment chemical plant is manufactured synthesizes the dedicated complete cleaner of ammonia,
Wet type desufurization system is that the synthesis dedicated complete wet desulfurizing unit of ammonia, sulphur solid are manufactured in Shenyang motor equipment chemical plant
System of processing is that the synthesis dedicated complete sulphur solid process equipment of ammonia is manufactured in Shenyang motor equipment chemical plant；In step
(4) steam generating system described in is the circulating fluidized bed boiler and 160,000 T/ of the 75T/h of Shenyang (power station) boiler factory manufacture
The liquid structure complete set of equipments in year is constituted；The Urea Conversion System described in step (5) is Mitsui industry strain formula
The complete ammonia for 130,000 T/ that commercial firm manufactures proposes gas equipment.
Due to the finiteness of literal expression, and objectively there is unlimited specific structure, for the common of the art
For technical staff, without departing from the principle of the present invention, can also make it is several improve, retouching or variation, can also be with
Above-mentioned technical characteristic is combined in the right way；These improve retouching, variation or combination, or not improved by invention
Conception and technical scheme directly apply to other occasions, are regarded as protection scope of the present invention.
Claims (10)
1. the gas-tight circulation comprehensive that closes is using the technique for preparing natural gas after a kind of synthetic ammonia tower, which is characterized in that using synthesis ammonia
System, low-pressure methane synthesis system, low pressure ice chest, the first high pressure cold box, the second high pressure cold box, six sections of high-pressure units connect and compose
Closed circulating operating system prepares natural gas；Low pressure ice chest is separately connected the four of low-pressure methane synthesis system and six sections of high-pressure units
Section entrance, four sections of entrances of six sections of high-pressure units connect nitrogen pipeline, and six sections of outlets of six sections of high-pressure units connect synthesis ammonia system, close
The first high pressure cold box is connected at ammonia system, the first high pressure cold box connects the second high pressure cold box, and the second high pressure cold box passes through circulator
Synthesis ammonia system is connected, the second high pressure cold box connects nitrogen pipeline；The low pressure ice chest, the second high pressure cold box are separately connected day
Right gas storage tank, the first high pressure cold box connection synthesis ammonia storage tank；The cooling temperature of the low pressure ice chest be -85~-57 DEG C, first
The cooling temperature of high pressure cold box is 109~-73 DEG C of ﹣, and the cooling temperature of the second high pressure cold box is 193~-129 DEG C of ﹣；
Processing step are as follows: pneumatic transmission enters in low pressure ice chest after the low-pressure methane synthesis system tower that low-pressure methane synthesis system generates, together
When 200 DEG C of ﹣ of nitrogen is injected into low pressure ice chest, sent for note nitrogen, the demethanation at low pressure, -85~-57 DEG C, methane for the first time
Enter storage in methane storage tank, residual gas enters six sections of high-pressure units from four sections of entrances of six sections of high-pressure units as ammonia low pressure syn-gas
Compression, six sections of outlets for being re-fed into six sections of high-pressure units are delivered to reaction in synthesis ammonia system and generate synthesis ammonia and be sent into synthesis ammonia storage
Slot synthesizes ammonia for product, while supervening and synthesizing ammonia at containing ammonia 3%, methane 24% by periodic off-gases, the unification of circulating air two gas
Gas after tower, pneumatic transmission enters the first high pressure cold box after synthetic ammonia tower, the deamination at high pressure, 109~-73 DEG C of ﹣, and liquefied ammonia is sent into storage of described liquefied ammonia
Interior storage, pneumatic transmission enters the second high pressure cold box after remaining synthetic ammonia tower, while -200 DEG C of nitrogen is injected into the second high pressure cold box,
For second of note nitrogen, the demethanation at high pressure, 193~-129 DEG C of ﹣, it is that product is natural that methane, which is sent into storage in natural gas storage tank,
Gas, residual gas are used as NH3 unstripped gas to pass through circulator feeding synthesis ammonia system production synthesis ammonia from pressure.
2. the gas-tight circulation comprehensive that closes utilizes the technique for preparing natural gas after a kind of synthetic ammonia tower according to claim 1,
It is characterized in that, the low pressure ice chest, the first high pressure cold box, the second high pressure cold box are seal case, and cabinet inner disc is around setting
Have cooling tube, be provided with aluminium wing on cooling tube, cooling tube one end of low pressure ice chest connects liquid nitrogen inlet duct, low pressure ice chest it is cold
But the pipe other end connects cooling tube one end of the first high pressure cold box, and the cooling tube other end of the first high pressure cold box connects the second high pressure
The other end of one end of ice chest, the second high pressure cold box connects liquid nitrogen outlet conduit, collectively forms circulating cooling system.
3. the gas-tight circulation comprehensive that closes utilizes the technique for preparing natural gas after a kind of synthetic ammonia tower according to claim 2,
Be characterized in that, the low pressure ice chest, the first high pressure cold box, the second high pressure cold box cooling tube on also set up nozzle；And low
Pressure ice chest and the second high pressure cold box exit be respectively arranged with nitrogen hydrogen detection device, detect nitrogen hydrogen than it is unqualified when, opening
Nozzle supplement injection nitrogen in low pressure ice chest, the second high pressure cold box adjusts nitrogen hydrogen ratio, and qualified nitrogen hydrogen ratio is 1:2.5.
4. the gas-tight circulation comprehensive that closes utilizes the technique for preparing natural gas after a kind of synthetic ammonia tower according to claim 2 or 3,
Its feature exists, and the low pressure ice chest, the first high pressure cold box, the second high pressure cold box are all made of Q235 or 304 stainless steels are made, low
Pressure ice chest, the first high pressure cold box, the second high pressure cold box cooling tube be all made of Q235 or 304 stainless steels are made.
5. the gas-tight circulation comprehensive that closes utilizes the technique for preparing natural gas after a kind of synthetic ammonia tower according to claim 1,
It is characterized in that, the closed circulating operating system further includes three flash columns, a flash column connection low pressure ice chest and day
Right gas storage tank, a flash column connect the first high pressure cold box and synthesis ammonia storage tank, a flash column connect the second high pressure cold box with
Natural gas storage tank.
6. the gas-tight circulation comprehensive that closes utilizes the technique for preparing natural gas after a kind of synthetic ammonia tower according to claim 1,
Be characterized in that, the low-pressure methane synthesis system by two press methyl alcohol synthetic reactor it is in series, successively with low pressure ice chest, six
Three sections of outlets connection of section high-pressure unit；Middle pressure methyl alcohol synthetic reactor substitutes methanol catalyst using methane catalyst；The middle pressure methanol
Synthetic tower is the complete middle pressure methyl alcohol synthetic reactor of Nanjing chemical manufacture.
7. the gas-tight circulation comprehensive that closes utilizes the technique for preparing natural gas after a kind of synthetic ammonia tower according to claim 1,
It is characterized in that, the synthesis ammonia system is that the Φ 1500 of Nanjing chemical manufacture or the complete synthetic ammonia tower of Φ 1200 are set
It is standby；Six sections of high-pressure units are the M632 type high-pressure unit of Shenyang Air-Compressor Manufactory's production.
8. a kind of coal synthesis ammonia production-line technique, which is characterized in that it includes the following steps:
(1) air separation with pressure is put forward into pure oxygen, nitrogen and product argon gas using space division system, pure oxygen, nitrogen are through liquefying
At product liquid oxygen, liquid nitrogen；
(2) feed coal, water are sent into the continuous wet type producer of pressurization static bed pure oxygen together with the pure oxygen that step (1) generates,
10~35kg/cm2, at 1250 DEG C reaction be produced from 1kg/cm with pressure2The carbon containing noble and unsullied semiwater gas of the hydrogeneous height of height and 400
DEG C -430 DEG C of the attached production steam of middle pressure collet；
(3) the noble and unsullied semiwater gas generated in step (2) is by electric dust removing system dedusting, wet desulphurisation system desulfurization, after desulfurization
Noble and unsullied semiwater gas six sections of high-pressure units be sent by one section of entrance of six sections of high-pressure units compressed, one section of inlet pressure is
1kg/cm2；The sulphur that desulfurization generates is processed into commodity sulphur by the fixed system of processing of sulphur；
(4) the attached production steam of 400 DEG C -430 DEG C of the middle pressure collet of step (2) attached production is sent into steam generating system power generation, at commodity
Electricity, while electrical power generation steam and afterheat steam are generated, the pressurization static bed pure oxygen that the afterheat steam of generation is sent into step (2) connects
Reaction water is supplemented in continuous wet type producer；
(5) the noble and unsullied semiwater gas of the compression exported from the second stage exit of six sections of high-pressure units in step (3) takes off CO2,CO2With step
Suddenly partially synthetic ammonia made of the electrical power generation steam, synthesis ammonia system 11 of (4) generation is sent into Urea Conversion System urea synthesis together
And it is sent into urea reservoir area, it is product urea；It is that CO2 is sent into six sections of high-pressure units that residual air after de- CO2, which is sent into change furnace transformation CO,
Three sections of entrances；
(6) low-pressure methane synthesis system is sent into from the gas of three sections of outlet outputs of six sections of high-pressure units in step (5) synthesize first
Alkane, and be sent into natural gas storage tank, is product natural gas, while attached production low pressure NH3Synthetic raw gas, low pressure NH3Synthetic raw gas contains
Methane less than or equal to 0.5%；
(7) the low pressure NH that step (6) generates3Synthetic raw gas passes through gas closed circulation after synthetic ammonia tower described in claim 1-7
Comprehensive utilization prepares the technique of natural gas, production product natural gas and synthesis ammonia.
9. a kind of coal synthesis ammonia production-line technique according to claim 8, which is characterized in that described in step (2)
The continuous wet type producer of pressurization static bed pure oxygen it is consistent with the gas generator structure that Jiangxi Changyi Industrial Co., Ltd. produces,
Including furnace body, the diameter of furnace body is 3.1 times of the gas generator diameter of Jiangxi Changyi Industrial Co., Ltd.'s production, furnace body and folder
The height of set boiler increases on year-on-year basis, and secondary steam heating pressurization coil pipe is had additional at the top of furnace body.
10. a kind of coal synthesis ammonia production-line technique according to claim 8, which is characterized in that described in step (1)
Space division system be Hangzhou space division (oxygen) Group Co., Ltd manufacture 28,000,000 m3/h type (liquid oxygen), 40,000,000 m3/h
Type (liquid nitrogen) synthesizes the dedicated complete air separation plant of ammonia；The electric dust removing system is Shenyang motor equipment in step (3)
The X-80000m3/h type of plant produced manufacture synthesizes the dedicated complete cleaner of ammonia, and wet type desufurization system is Shenyang motor
The synthesis dedicated complete wet desulfurizing unit of ammonia is manufactured in equipment chemical plant, and sulphur solid system of processing is Shenyang motor equipment
Manufacture the synthesis dedicated complete sulphur solid process equipment of ammonia in chemical plant；The steam generating system described in step (4)
For the circulating fluidized bed boiler of the 75T/h of Shenyang (power station) boiler factory manufacture and the liquid structure complete set of equipments of 160,000 T/
It constitutes；The Urea Conversion System described in step (5) is 130,000 T/'s that Mitsui industry Co., Ltd. manufactures
Complete ammonia proposes gas equipment.
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