CN104342219A - System and method for producing synthetic natural gas - Google Patents
System and method for producing synthetic natural gas Download PDFInfo
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- CN104342219A CN104342219A CN201310334564.4A CN201310334564A CN104342219A CN 104342219 A CN104342219 A CN 104342219A CN 201310334564 A CN201310334564 A CN 201310334564A CN 104342219 A CN104342219 A CN 104342219A
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Abstract
The invention relates to a system for producing synthetic natural gas. The system comprises a first gasifying unit, a first water washing unit, a first methanation unit and a coal water slurry preparing unit, wherein the first gasifying unit is used for gasifying a carbonaceous matter and supplying first synthetic gas; the first water washing unit is used for receiving the first synthetic gas and supplying first water washing gas and first waste water; the first methanation unit is used for receiving the first water washing gas and supplying first synthetic natural gas of which the methane content is higher than that of the first water washing gas; and the coal water slurry preparing unit is used for preparing coal water slurry by using at least a part of the first waste water containing ash coming from the first synthetic gas. The invention further relates to a relevant method for producing the synthetic natural gas.
Description
Technical field
The present invention relates to the system and method for production synthetic natural gas.
Background technology
Along with the raising of people's living standard, the requirement of living environment is also improved day by day, thus people also aggravate to rise to the demand of the clean energies such as Sweet natural gas.But Sweet natural gas natural resources is limited, is therefore developed the system and method utilizing the carbonaceous material production synthetic natural gases such as coal.Such as, No. 200910155045.Xth, Chinese invention patent application discloses a kind of system and method producing synthetic natural gas.
But, the system and method for existing production synthetic natural gas can not meet some demands of present stage people, such as in the process of waste water, No. 200910155045.Xth, Chinese invention patent application reclaims, for increasing the moisture content of synthetic gas after mentioning the waste water flash distillation produced by washing synthetic gas.But flash distillation cost is higher, especially when wastewater flow rate is larger.
Therefore, the system and method developing new production synthetic natural gas is needed.
Summary of the invention
The present invention relates to a kind of system and method for new production synthetic natural gas.
On the one hand, the system of the production synthetic natural gas that the present invention relates to comprises: the first gasification unit, provides the first synthetic gas for gasification of carbonaceous material; First washing unit, for receiving the first synthetic gas and providing the first washing gas and the first waste water; First methanation unit, for receiving the first washing gas and providing methane content higher than the first synthetic natural gas of the first washing gas; And coal water slurry prepares unit, for utilizing containing at least part of first waste water from the ash of the first synthetic gas to prepare coal water slurry.
On the other hand, the present invention relates to a kind of method of producing synthetic natural gas, it comprises: gasification of carbonaceous material is to provide the first synthetic gas; Wash the first synthetic gas to provide the first washing gas and the first waste water; Methanation first washes gas to provide methane content higher than the first synthetic natural gas of the first washing gas; And prepare coal water slurry with containing at least part of first waste water from the ash of the first synthetic gas.
Accompanying drawing explanation
With reference to accompanying drawing reading detailed description below, can help to understand feature of the present invention, aspect and advantage, wherein:
Fig. 1-3 is schematic diagram of the system of the production synthetic natural gas of different embodiment according to the subject invention.
Embodiment
Define separately except clear in non-invention, the implication that the implication of the Science and Technology term used is understood usually for those skilled in the art." first ", " second " that use in the present invention and similar word do not represent any order, quantity or importance, and are only used to be distinguished from each other." comprising ", " comprising " or " containing " of using in the present invention and similar word refer to that other project also can within scope except listing in project thereafter and equivalent thereof.
Approximate term in the present invention is used for modifying quantity, represents that the present invention is not limited to this concrete quantity, also comprises close to this quantity, acceptable, can not to cause the correction of the change of relevant basic function part.Accordingly, modify a numerical value with " approximately ", " about " etc., mean and the invention is not restricted to this exact numerical.In certain embodiments, approximate term may correspond to the precision of the instrument measuring numerical value.Numerical range in the present invention can merge and/or exchange, unless clearly demonstrated separately, numerical range comprises its all numerical value subranges contained.
In the specification and in the claims, unless clearly pointed out in addition, single plural number of all items is not limited.Unless the context clearly dictates otherwise, term "or", " or " and do not mean that exclusive, and refer to existence mentions in project (such as composition) at least one, and the situation that the combination comprising the project of mentioning can exist.
"available" mentioned by the present invention and " possibility " represent the possibility occurred under certain environment; There is the character of specifying, the possibility of feature or function; And/or by one or more ability of display, performance and be suitable for another kind of action, or the possibility relevant to the action that this is applicable to.Therefore, represent that the term modified obviously is applicable to, or can be suitable for represented ability, function for "available" and " possibility ", or purposes, consider in some cases simultaneously, the term modified may be not suitable for sometimes, can not or improper.Such as, in some cases, event or ability may be desired, and in other cases, this event or ability can not occur.These situations are described by term "available" and " possibility ".
Mention in specification sheets of the present invention " some embodiments " etc., represent that described a kind of specific factor related to the present invention (such as feature, structure and/or feature) is comprised at least one embodiment described in this specification sheets, may maybe can not come across in other embodiments.In addition, it is to be appreciated that described invention key element can combine in any suitable manner.
Hereinafter, with reference to the accompanying drawings embodiments of the present invention are described, but well-known function and structure and unnecessary details can not be described in detail.As described later, embodiments of the invention relate to the system and method for production synthetic natural gas.Described system and method uses waste water to prepare coal water slurry, reduces the requirement of wastewater treatment, so cost is lower, and enters in coal water slurry from incendivity compositions such as the ashes (also claiming flying dust or carefully grey) of synthetic gas in waste water, thus is recycled utilization.
Please refer to Fig. 1-3, in some embodiments, the system 1,100 of the production synthetic natural gas that the present invention relates to, 200 comprise: the first gasification unit 2,102,202, for gasification of carbonaceous material 3,103,203 and the first synthetic gas 4,104,204 is provided; First washing unit 5,105,205, for receiving the first synthetic gas 4,104,204 and providing the first washing gas 6,106,206 and the first waste water 7,107,207; First methanation unit 8,108,208, for receiving the first washing gas 6,106,206 and providing methane content higher than the first synthetic natural gas 9,109,209 of the first washing gas 6,106,206; And coal water slurry prepares unit 10,110,210, for utilizing at least part of first waste water 7,107 containing the ash (also claiming flying dust or carefully grey, non-label) from the first synthetic gas, 207 prepare coal water slurry 11,111,211.
First gasification unit 2,102,202 can comprise any can gasification of carbonaceous material 3,103,203 generate the first synthetic gas 4,104, the device of 204.In some embodiments, the first gasification unit 2,102,202 comprise fixed-bed gasification furnace, such as lurgi gasifier, BGL stove etc.
Carbonaceous material 3,103,203 can be anyly can be vaporized generation first synthetic gas 4,104, the carbonaceous material of 204.Carbonaceous material 3,103,203 can be solid, liquid, gas or their arbitrary combination.Carbonaceous material 3, 103, 203 can comprise, but be not limited to, coal, coke, cracking-residuum, crude oil, gas oil, Residual oil, overhead product, paraffin, aromatic hydrocarbons material is rich in from solvent deasphalting unit, aromatic hydrocarbon, cycloalkanes, resinous shale, oil-sand, tar, pitch, oil bearing rock, waste oil, biomass (such as plant and/or animal substance, or the material of plant and/or animal-origin), pitch, low ash or ashless polymeric, hydrocarbon system polymeric material, come the heavy hydrocarbon body refuse in refinery and petroleum chemical plant and bottom product such as chloroflo, derive from the byproduct of production operation, such as carpet and/or comprise the plastic automobile part/assembly such as snubber and dashboard etc. abandon the consumer's goods, as polypropylene, polyethylene, polystyrene, urethane, its derivative, the plastics that its mixture or its any combination etc. recycle.In some embodiments, carbonaceous material 3,103,203 are applicable to fixed-bed gasification furnace, as lurgi gasifier, are lump coal.
First synthetic gas 4,104,204 can be carbonaceous material 3,103, any synthetic gas that 203 gasifications generate.First synthetic gas 4,104, can contain carbon monoxide, carbonic acid gas, hydrogen, ash or tar etc. in 204.In some embodiments, the temperature of the first synthetic gas 4,104,204 is the scope of about 300 degrees Celsius to about 600 degrees Celsius.
First washing unit 5,105,205 can comprise anyly can carry out to the first synthetic gas 4,104,204 device washed.At the first washing unit 5,105, in 205, water-band walks the first synthetic gas 4,104, the ash in 204 or tar etc., generates the first washing gas 6,106,206 and containing the first waste water 7,107,207 from the ash of the first synthetic gas 4,104,204 or tar etc.
It can be the device of synthetic natural gas by Synthetic holography that first methanation unit 8,108,208 can comprise any.In some embodiments, the first methanation unit 8,108,208 comprises the first methanation device 12,112,212 and is positioned at the first methanation device 12,112,212 and the first washes unit 5,105, the first changing device 13,113,213 between 205.
In some embodiments, the first changing device 13,113,213 containing water-gas shift (non-label), the first washing gas 6,106,206 and water vapour (non-label) react wherein and monoxide conversion be carbonic acid gas and generate hydrogen, as shown in aftermentioned water gas shift reaction formula:
obtain first conversion gas 14,114,214 of hydrogen content higher than the first washing gas 6,106,206.
Catalyzer can be used in water gas shift reaction.Water gas converting catalyst can be any catalyzer being suitable for this purposes.Such as, water gas converting catalyst can containing to exist in the form of an oxide and/or with the aluminium of carrier supported, magnesium, molybdenum, cobalt, silicon, sodium, erbium, calcium, potassium, titanium, copper, zinc and/or chromium.At the first methanation device 12,112, in 212, the first conversion gas 14,114, the carbon monoxide of 214 li, carbonic acid gas and hydrogen reaction, as shown in aftermentioned reaction formula:
thus obtain methane content washes gas 6,106,206 the first synthetic natural gas 9,109,209 higher than the first conversion gas 14,114,214 and the first.
In some embodiments, the first changing device 13,113,213 is containing desulfurizer (non-label), and the first washing gas 6,106,206 remove sulphur wherein, obtain first conversion gas 14,114,214 of sulphur content lower than the first washing gas 6,106,206.
At the first methanation device 12,112, in 212, the first conversion gas 14,114, the carbon monoxide of 214 li and steam reaction, as shown in aftermentioned reaction formula:
thus obtain methane content washes gas 6,106,206 the first synthetic natural gas 9,109,209 higher than the first conversion gas 14,114,214 and the first.
Coal water slurry prepares unit 10, and 110,210 can comprise any can utilization prepares coal water slurry 11,111, the device of 211 containing at least part of first waste water 7,107,207 from the ash of the first synthetic gas.Coal 15,115,215 join coal water slurry prepares unit 10,110, in 210.In some embodiments, coal 15,115,215 is fine coal.
In some embodiments, the second gasification unit 16,116,216 receives coal water slurry 11,111,211, is gasified and obtains the second synthetic gas 17,117,217.In some embodiments, the temperature of the second synthetic gas 17,117,217 is the scope of about 1250 degrees Celsius to about 1350 degrees Celsius.
In some embodiments, as shown in Figure 1, the system 1 of production synthetic natural gas comprises the second washing unit 18 and contains the second methanation unit 21 of the second changing device 19 and the second methanation device 20, it is washed unit 5 and the first methanation unit 8 and processes the first synthetic gas 4 with above-mentioned first and prepare the similar method of the first synthetic natural gas 9, and the second synthetic gas 17 is processed into the second synthetic natural gas 22.
In some embodiments, the first waste water is directly used in preparation coal water slurry.In some embodiments, the first waste water is all for the preparation of coal water slurry.
In some embodiments, be used further to after the first waste water utilizes further prepare coal water slurry.Such as, as shown in Figure 1, the second washing unit 18 is for receiving the first waste water 7 and providing the second waste water 23 to coal water slurry to prepare unit 10.In the second washing unit 18, ash in second synthetic gas 17 or tar etc. enter the first waste water 7, obtain ash or higher the first waste water of tar equal size, i.e. the second waste water 23, ash in first synthetic gas 4 and the second synthetic gas 17 all enters coal water slurry 11 by waste water, improves whole system to the recycling of combustible ingredient and the total cost reducing whole system.In some embodiments, the heat of the second synthetic gas 17 makes the coal-tar middle oil macromolecular compound that waits of the first waste water 7 decompose, thus obtains the first lower waste water of the macromolecular compound content such as tar, i.e. the second waste water 23.In addition, the heat of the second synthetic gas 17 also can make part first waste water 7 evaporate, thus adjustment joins second waste water 23 water yield that coal water slurry prepares unit 10.
In some embodiments, the first waste water is used further to prepare coal water slurry after treatment.Such as, as shown in Figures 2 and 3, the system 100,200 of production synthetic natural gas comprises and is positioned at the first washing unit 105,205 and coal water slurry prepares unit 110, the unit for treating water 127,227 between 210.Unit for treating water 127, the first waste water 107,207 processes by 227, obtains preparing unit 110 to coal water slurry, and the part contained from the ash of the first synthetic gas 104,204 of 210 the first waste water 107,207 provided, namely processes water 128,228.
In some embodiments, unit for treating water 127,227 comprise concentrating unit (non-label), as filtration unit, film device etc., dense water section 128,228 of its concentrated the first waste water containing ash or tar etc. obtained for the preparation of coal water slurry 111,211, clear water part (not shown) then can be discharged, or recycles.
The ash of the first synthetic gas 104,204 or tar etc. enter into coal water slurry 111, in 211, its combustible ingredient can be recycled utilization, and to unit for treating water 127, the requirement of 227 also reduces, thus reduce the total cost of the system 100,200 of production synthetic natural gas.
In some embodiments, as shown in Figure 2, the gas mixture 126 that first washing unit 105 comprises water washing device 124 and the mixing device between the first gasification unit 102 and water washing device 124 125, first synthetic gas 104 and the second synthetic gas 117 enters water washing device 124 from mixing device 125.In some embodiments, first synthetic gas 104 is different with the temperature of the second synthetic gas 117, by mixing, the temperature of the high synthetic gas of temperature can be reduced before washing, and the heat energy of the synthetic gas utilizing temperature high, such as, by the macromolecular compound in synthetic gas low for temperature, as tar, resolve into low molecular compound further, thus reduce the macromolecular compound content in the first waste water 107.In some embodiments, the temperature of the first synthetic gas 104 is lower than the temperature of the second synthetic gas 117.
In some embodiments, as shown in Figure 3, the second gasification unit 216 is prepared between unit 210 and the first gasification unit 202 in coal water slurry.Second synthetic gas 217 enters the first gasification unit 202, for the preparation of the gasification step of the first synthetic gas 204.In some embodiments, the temperature of the second synthetic gas 217 is higher, and it is for the first gasification unit 202, provide heat energy can to the first gasification unit 202, thus reduce the demand of the first gasification unit 202 heat energy to external world.
Except previously described, the present invention also can comprise other device being suitable for production synthetic natural gas and techniques, such as remove device and the technique of partial CO 2 in synthetic gas, and the device of waste heat recovery production steam and technique etc., just do not enumerate herein.
" synthetic gas " mentioned in the present invention, " washing gas " and similar terms refer to the synthetic gas after gasification, water washing device or technique or material respectively, but may also have passed through other devices or technique, such as, after gasification, other device or technique may be also had before washing, but except non-specifically illustrates in addition, during that, all can be described as " synthetic gas ".Similarly, after water washing, other device or technique may be also had before methanation, but illustrate in addition except non-specifically, during that, all can be described as " washing gas ".By that analogy.
Although describe the present invention in conjunction with the specific embodiments, those skilled in the art will appreciate that and can make many amendments and modification to the present invention.Therefore, recognize, the intention of claims is to cover all such modifications in true spirit of the present invention and scope and modification.
Claims (12)
1. produce a system for synthetic natural gas, it comprises:
First gasification unit, provides the first synthetic gas for gasification of carbonaceous material;
First washing unit, for receiving the first synthetic gas and providing the first washing gas and the first waste water;
First methanation unit, for receiving the first washing gas and providing methane content higher than the first synthetic natural gas of the first washing gas; And
Coal water slurry prepares unit, for utilizing containing at least part of first waste water from the ash of the first synthetic gas to prepare coal water slurry.
2. the system of production synthetic natural gas as claimed in claim 1, comprising: the second gasification unit, for receiving coal water slurry and providing the second synthetic gas; Second washing unit, for receiving the second synthetic gas and providing the second washing gas and the second waste water; And second methanation unit, for receiving the second washing gas and providing methane content higher than the second synthetic natural gas of the second washing gas.
3. the system of production synthetic natural gas as claimed in claim 2, wherein the second washing unit is for receiving the first waste water and providing the second waste water to prepare unit to coal water slurry.
4. the system of production synthetic natural gas as claimed in claim 1, comprises the second gasification unit, for receiving coal water slurry and providing the second synthetic gas; Wherein the first washing unit comprises water washing device and the mixing device between the first gasification unit and water washing device, and mixing device is for mixing the first synthetic gas and the second synthetic gas and providing mixed synthetic gas to water washing device.
5. the system of production synthetic natural gas as claimed in claim 1, comprises the second gasification unit, for receiving coal water slurry and providing the second synthetic gas to the first gasification unit.
6. as the system of the production synthetic natural gas in claim 1,2,4 and 5 as described in any one, comprise and prepare unit for treating water between unit at the first washing unit and coal water slurry, provide containing the process water from the ash of the first synthetic gas for receiving the first waste water and preparing unit to coal water slurry.
7. produce a method for synthetic natural gas, it comprises:
Gasification of carbonaceous material is to provide the first synthetic gas;
Wash the first synthetic gas to provide the first washing gas and the first waste water;
Methanation first washes gas to provide methane content higher than the first synthetic natural gas of the first washing gas; And
Coal water slurry is prepared with containing at least part of first waste water from the ash of the first synthetic gas.
8. the method for production synthetic natural gas as claimed in claim 7, comprises gasified coal water slurry to provide the second synthetic gas, and mixes the second synthetic gas and the first synthetic gas.
9. the method for production synthetic natural gas as claimed in claim 7, comprises gasified coal water slurry to provide the second synthetic gas, and the second synthetic gas is used for gasification of carbonaceous material to provide the step of the first synthetic gas.
10. the method for production synthetic natural gas as claimed in claim 7, comprises gasified coal water slurry to provide the second synthetic gas, for production second synthetic natural gas.
11. as the method for the production synthetic natural gas in claim 7 to 10 as described in any one, comprise process first waste water be provided for preparing coal water slurry containing the process water from the ash of the first synthetic gas.
The method of 12. production synthetic natural gases as claimed in claim 7, comprises gasified coal water slurry to provide the second synthetic gas, washes the second synthetic gas obtain the second waste water with the first waste water, and uses the second waste water to prepare coal water slurry.
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| CN201811283958.0A CN109370669A (en) | 2013-08-02 | 2013-08-02 | The system and method for producing synthetic natural gas |
| CN201310334564.4A CN104342219A (en) | 2013-08-02 | 2013-08-02 | System and method for producing synthetic natural gas |
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2013
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- 2013-08-02 CN CN201310334564.4A patent/CN104342219A/en active Pending
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