CN104673417A - System and method for precooling, drying and purifying coal-based natural gas - Google Patents
System and method for precooling, drying and purifying coal-based natural gas Download PDFInfo
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- CN104673417A CN104673417A CN201510083813.6A CN201510083813A CN104673417A CN 104673417 A CN104673417 A CN 104673417A CN 201510083813 A CN201510083813 A CN 201510083813A CN 104673417 A CN104673417 A CN 104673417A
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Abstract
The invention provides a system and method for precooling, drying and purifying coal-based natural gas. The system comprises a precooler, a gas-liquid separator, a cooler and a washing tower, wherein a separator inlet of the gas-liquid separator is connected with a first cooling natural gas outlet of the precooler; a first cooling natural gas inlet of the precooler is connected with a separator outlet of the gas-liquid separator; a second cooling natural gas inlet of the washing tower is connected with a second natural gas outlet of the cooler, wherein a methanol washing liquid inlet of the washing tower is connected with a low-temperature methanol washing device in a purified synthesized gas system, and a methanol washed liquid outlet of the washing outlet is connected with the low-temperature methanol absorption tower in the purified synthesized gas system, so that the system for drying and purifying the second cooling natural gas in the washing tower in advance and returning the synthesized gas by utilizing low-temperature methanol produced by the low-temperature methanol washing device is facilitated for purification of synthesized gas.
Description
Technical field
The invention belongs to coal preparing natural gas dry decontamination process field, specifically, the present invention relates to the system and method for the pre-cooled of coal preparing natural gas and dry decontamination.
Background technology
The main component of coal preparing natural gas is methane, therefore also referred to as methane gas.The product of the methanation (methane synthesis) of coal preparing natural gas device is about the 40 DEG C coal preparing natural gas (methane gas) containing saturation water, enters before LNG is produced in pipe natural gas long-distance transport pipes or methane gas liquefaction and must carry out dehydrating purifying treatment.Common method has cold partition method, solid absorption method and solvent absorption.
Cold partition method utilizes pressure change to cause temperature variation, makes the method that water vapor condensation from gas phase is got off.Conventional have two kinds of flow processs: cooling process after throttling expansion cooling process and pressurization, the ridity of above-mentioned two kinds of method gases and dew-point temperature, will by various factors and power loss greatly, do not reach very low dew-point temperature.
Solid absorption method dewatering process is with porous solid absorbent process gaseous mixture, and one or several wherein contained components are adsorbed on solid surface to reach the operation of separation.Adsorption has two kinds of situations: one is interaction between solid and gas is not very strong, is similar to condensing, causes the power involved by this absorption with causing the pattern ylid Chuihua molecule cohesive force of condensing effect identical, being referred to as physical adsorption; Another kind is chemisorption, and this class tells attachedly to need activation energy.Physical adsorption is a reversing process, and chemisorption is irreversible, and being told attached gas often needs just can evict from very high temperatures, and the gas disengaged often chemical transformation occurs.
Fixed bed physical adsorption mostly is at present for gas dehydration.With the impurity of sorbent material removing gaseous mixture, adsorbent reactivation is generally all made to recycle.Intensification desorption is industrial conventional renovation process.This be based on all siccative wet volume capacity all with temperature rise and reduce this feature to realize.A kind of desorption gas through preheating of usual employing heats bed, makes the molecule desorption of adsorbed material, and then takes them out of adsorber with carrier gas, so just can reach absorption, cyclic regeneration.Heat needed for adsorbent reactivation brings adsorption bed into by carrier gas, and the regeneration temperature of general sorbent material is 175 ~ 260 DEG C.
The operating process of solid drier dehydration is periodic, with one or more drying tower adsorption dewatering.Planar water energy force rate adsorbs hydrocarbons or the strong siccative of absorbing acid gases ability should be adopted, by the siccative that is drawn through water moisture to be taken out of with hot gas and make it regeneration.
Conventional solid absorption evaporation has Calcium Chloride Method, silica gel method, activated alumina and activated bauxite method, sieve method and compound fixing Desicdant method etc.Compound fixing siccative is the advantage combining multiple siccative.This method is according to different sources of the gas, places different dewatering agents respectively, to remove the moisture of different components gas selectively.The sorbent material that gas dehydration process uses has molecular sieve and silica gel usually.
Solid absorption dewatering process for large discharge gas investment and running cost all higher, this technique is only suitable for the low pressure natural gas process of low discharge.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, one object of the present invention is to propose for the system and method for the pre-cooled of coal preparing natural gas with dry decontamination.
According to an aspect of the present invention, the present invention proposes a kind of for the system of the pre-cooled of coal preparing natural gas with dry decontamination, comprising:
Pre-cooler, described pre-cooler has gas inlet, the first cooled natural gas outlet, the first refrigerant inlet and the first refrigerant exit, and described pre-cooler is suitable for carrying out the first cooling process to coal preparing natural gas and obtaining the first cooled natural gas;
Gas-liquid separator, described gas-liquid separator has separator inlet, separator outlet and condensate outlet, and described separator inlet exports with described first cooled natural gas and is connected, and described gas-liquid separator is suitable for carrying out gas-liquid separation to described first cooled natural gas;
Water cooler, described water cooler has the first cooled natural gas entrance, the second cooled natural gas outlet, the second refrigerant inlet and the second refrigerant exit, described first cooled natural gas entrance is connected with described separator outlet, and described water cooler is suitable for carrying out the second cooling process to the first cooled natural gas through described gas-liquid separation and obtaining the second cooled natural gas;
Washing tower, after described washing tower has the second cooled natural gas entrance, methanol wash liquid entrance, the outlet of purification methane and methanol wash, liquid exports, described second cooled natural gas entrance exports with described second cooled natural gas and is connected, described washing tower is suitable for utilizing methanol wash liquid to carry out drying and purifying treatment to described second cooled natural gas, so that liquid and purification methane after obtaining being rich in the methanol wash of methane;
Wherein, described methanol wash liquid entrance is connected with the low temperature washing device for methanol in the system of decontaminating syngas, after described methanol wash, liquid outlet is connected with the low-temp methanol absorption tower in the system of described decontaminating syngas, so that the low-temp methanol utilizing described low temperature washing device for methanol to produce returns the system of described decontaminating syngas for decontaminating syngas after carrying out dry decontamination process to described second cooled natural gas in advance in described washing tower.
Thus, being combined with the system of decontaminating syngas for the pre-cooled of coal preparing natural gas and the system of dry decontamination of the above embodiment of the present invention, after the low-temp methanol prepared in the system of decontaminating syngas is carried out dry decontamination process to coal preparing natural gas in advance, return for purification, be purified synthetic gas raw gas, be purified synthetic gas.Adopt same solvent methanol to purify raw gas and methane gas thus simultaneously, there is methane gas degree of purification high, in methane gas, methyl alcohol is carried secretly few, entrainment portions methane in methanol solution, after methanol wash, liquid can directly as the absorption liquid of low-temperature rectisol absorption tower tower top, and then eliminate separately for coal preparing natural gas washing tower is provided for low-temp methanol and the regeneration system rapidly of dry decontamination, reach energy-saving and cost-reducing object; Or eliminate and separately dry decontamination system is set separately for coal preparing natural gas dry decontamination, reach and reduce investment outlay and fall low consumed object.
In addition, the system for the pre-cooled of coal preparing natural gas and dry decontamination according to the above embodiment of the present invention can also have following additional technical characteristic:
In some embodiments of the invention, the system for the pre-cooled of coal preparing natural gas and dry decontamination of above-described embodiment comprises further: methyl alcohol force (forcing) pump, after described methyl alcohol force (forcing) pump is located at described methanol wash liquid outlet and described decontaminating syngas system in low-temp methanol absorption tower between and be suitable for liquid pump after described methanol wash to enter in described low-temp methanol absorption tower.
In some embodiments of the invention, the system for the pre-cooled of coal preparing natural gas and dry decontamination of above-described embodiment comprises further: degassing vessel, described degassing vessel is located between described washing tower and described methyl alcohol force (forcing) pump, and the methane be rich in liquid after described degassing vessel is suitable for removing described methanol wash is also back in described washing tower.
In some embodiments of the invention, described second refrigerant inlet is connected with the regeneration system rapidly of the low temperature washing device for methanol in the system of described decontaminating syngas, and described second refrigerant exit is connected with described first refrigerant inlet, so that the low temperature exhaust gas utilizing the regeneration system rapidly of the low temperature washing device for methanol in the system of described decontaminating syngas to discharge and/or low-temperature carbon dioxide carry out the first cooling process and the second cooling process to described Sweet natural gas;
Optionally, comprise further: methanol solution entrance, described methanol solution entrance is arranged on the pipeline of the described gas-liquid separator of connection and described water cooler, with before carrying out described second cooling process, in described first cooled natural gas, sprays into methanol solution.
In some embodiments of the invention, described second refrigerant inlet exports with described purification methane and is connected, and described second refrigerant exit is connected with described first refrigerant inlet, to utilize described purification methane to carry out the first cooling process and the second cooling process to described Sweet natural gas.
In some embodiments of the invention, the temperature of described methanol wash liquid is-40 ~-70 degrees Celsius, and the temperature of described first cooled natural gas is 3-8 degree Celsius, and the temperature of described second cooled natural gas is-20 ~-40 degrees Celsius.
According to a further aspect in the invention, the invention allows for and a kind ofly utilize the foregoing system for the pre-cooled of coal preparing natural gas and dry decontamination to carry out method that is pre-cooled and dry decontamination to coal preparing natural gas, the method comprises:
In pre-cooler, the first cooling process is carried out to coal preparing natural gas, to obtain the first cooled natural gas;
In gas-liquid separator, gas-liquid separation is carried out to described first cooled natural gas, so that separation of water vapor phlegma;
In water cooler, the second cooling process carried out to the first cooled natural gas through described gas-liquid separation and obtain the second cooled natural gas;
In washing tower, drying and purifying treatment are carried out, to be purified methane to described second cooled natural gas;
Wherein, the methanol wash liquid produced from the low temperature washing device for methanol in decontaminating syngas system is utilized to carry out drying and purifying treatment to described second cooled natural gas, obtain being rich in liquid after the methanol wash of methane, and liquid after described methanol wash is returned in the low-temp methanol absorption tower in the system of described decontaminating syngas purifying treatment is carried out to raw gas, be purified synthetic gas.
In some embodiments of the invention, above-mentionedly method that is pre-cooled and dry decontamination is carried out to coal preparing natural gas comprise further: utilize methyl alcohol force (forcing) pump to enter in described low-temp methanol absorption tower by liquid pump after described methanol wash;
Optionally, comprise further: the methane be rich in liquid after utilizing degassing vessel to remove described methanol wash is also back in described washing tower.
In some embodiments of the invention, the low temperature exhaust gas utilizing the regeneration system rapidly of the low temperature washing device for methanol in the system of described decontaminating syngas to discharge and/or low-temperature carbon dioxide carry out the first cooling process and the second cooling process to described Sweet natural gas;
Optionally, comprise further: before carrying out described second cooling process, in described first cooled natural gas, spray into methanol solution.
In some embodiments of the invention, described purification methane is utilized to carry out the first cooling process and the second cooling process to described Sweet natural gas.
Accompanying drawing explanation
Fig. 1 is according to an embodiment of the invention for the structural representation of the pre-cooled of coal preparing natural gas with the system of dry decontamination.
Fig. 2 is in accordance with another embodiment of the present invention for the structural representation of the pre-cooled of coal preparing natural gas with the system of dry decontamination.
Embodiment
According to an aspect of the present invention, the present invention proposes a kind of system for the pre-cooled of coal preparing natural gas and dry decontamination.Describe the system for the pre-cooled of coal preparing natural gas and dry decontamination of the specific embodiment of the invention in detail below with reference to Fig. 1-2, this system comprises: pre-cooler 10, gas-liquid separator 20, water cooler 30 and washing tower 40.
Wherein, pre-cooler 10 has gas inlet 11, first cooled natural gas outlet the 12, first refrigerant inlet 13 and the first refrigerant exit 14.According to a particular embodiment of the invention, pre-cooler 10 is suitable for carrying out the first cooling process to coal preparing natural gas and obtaining the first cooled natural gas.
Gas-liquid separator 20 has separator inlet 21, separator outlet 22 and condensate outlet 23, and separator inlet 21 and the first cooled natural gas export 12 and be connected.According to a particular embodiment of the invention, gas-liquid separator 20 is suitable for carrying out gas-liquid separation to the first cooled natural gas.
Water cooler 30 has first cooled natural gas entrance 31, second cooled natural gas outlet the 32, second refrigerant inlet 33 and the second refrigerant exit 34, first cooled natural gas entrance 31 is connected with separator outlet 22.According to a particular embodiment of the invention, water cooler 30 is suitable for carrying out the second cooling process to the first cooled natural gas through gas-liquid separation and obtaining the second cooled natural gas.
After washing tower 40 has the second cooled natural gas entrance 41, methanol wash liquid entrance 42, purification methane outlet 43 and methanol wash, liquid outlet the 44, second cooled natural gas entrance 41 exports 32 with the second cooled natural gas and is connected.According to a particular embodiment of the invention, washing tower 40 is suitable for utilizing methanol wash liquid to carry out drying and purifying treatment to the second cooled natural gas, so that liquid and purification methane after obtaining being rich in the methanol wash of methane.
According to a particular embodiment of the invention, methanol wash liquid entrance 42 is connected with the low temperature washing device for methanol regeneration system rapidly in the system of decontaminating syngas (see photo), after methanol wash, liquid outlet is connected with the low-temp methanol absorption tower in the system of decontaminating syngas, so that the low-temp methanol utilizing low temperature washing device for methanol regeneration system rapidly to produce returns the system of decontaminating syngas for decontaminating syngas after carrying out dry decontamination process to the second cooled natural gas in advance in washing tower.
Thus, being combined with the system of decontaminating syngas for the pre-cooled of coal preparing natural gas and the system of dry decontamination of the above embodiment of the present invention, after the low-temp methanol prepared in the system of decontaminating syngas is carried out dry decontamination process to coal preparing natural gas in advance, returning for purifying raw gas, being purified synthetic gas.Adopt same solvent methanol to purify raw gas and methane gas thus simultaneously, there is methane gas degree of purification high, in methane gas, methyl alcohol is carried secretly few, entrainment portions methane in methanol solution, after methanol wash, liquid can directly as the absorption liquid of low-temperature rectisol absorption tower tower top, and then eliminate separately for coal preparing natural gas washing tower is provided for low-temp methanol and the regeneration system rapidly of dry decontamination, reach energy-saving and cost-reducing object; Or eliminate and separately dry decontamination system is set separately for coal preparing natural gas dry decontamination, reach and reduce investment outlay and fall low consumed object.
In addition, system for the pre-cooled of coal preparing natural gas and dry decontamination of the present invention is combined with low temperature washing device for methanol, whole low-temp methanol lean solutions after low-temperature rectisol hot recycling participate in the washing dry decontamination of coal preparing natural gas, and the methanol solution at the bottom of methane gas washing tower tower all can return to the low-temperature rectisol absorption tower tower top of elevated pressures as absorption washings.Whole low-temp methanol lean solution participates in methane gas washing, and one is the temperature reducing purification methane gas as far as possible, and the dry decontamination of methane gas is more thorough, and in purification methane gas, methanol content is lower, and methanol loss is minimum; Two is that whole methyl alcohol lean solution is saturated methane gas, methane carrying amount in methanol solution is maximum, discharge in the absorption tower of low-temperature rectisol and enter decontaminating syngas, dilute the concentration of hydrogen and carbon monoxide in decontaminating syngas, be conducive to the heating strength of the methane building-up reactions reducing follow-up coal preparing natural gas, reduce the circulating flow rate of methanator, thus reduce the energy consumption of recycle compressor; Three is that the temperature of purification methane gas is low, is conducive to the freezing energy consumption reducing methane gas liquefaction preparing liquefied natural gas LNG device.
According to a particular embodiment of the invention, the system for the pre-cooled of coal preparing natural gas and dry decontamination of above-described embodiment, can further include: methyl alcohol force (forcing) pump 50, methyl alcohol force (forcing) pump 50 is located between the low-temp methanol absorption tower in the system of liquid outlet 44 and decontaminating syngas after methanol wash.According to concrete example of the present invention, utilizing this methyl alcohol force (forcing) pump 50 liquid pump after methanol wash can be entered the low-temperature rectisol absorption tower tower top of elevated pressures as absorbing washings to purifying, being purified synthetic gas.
According to a particular embodiment of the invention, the system for the pre-cooled of coal preparing natural gas and dry decontamination of above-described embodiment, can further include: degassing vessel 60, degassing vessel 60 is located between washing tower 40 and methyl alcohol force (forcing) pump 60.Thus, the methane be rich in liquid after utilizing this degassing vessel to be suitable for removing described methanol wash is also back in described washing tower.
According to a particular embodiment of the invention, above-described embodiment in the system of the pre-cooled of coal preparing natural gas and dry decontamination, second refrigerant inlet 33 is connected with the regeneration system rapidly of the low temperature washing device for methanol in the system of described decontaminating syngas, and the second refrigerant exit 34 is connected with the first refrigerant inlet 13.Thus, the low temperature exhaust gas that the regeneration system rapidly of the low temperature washing device for methanol in the system of described decontaminating syngas can be utilized to discharge and/or low-temperature carbon dioxide carry out the first cooling process and the second cooling process to Sweet natural gas, reclaim cold logistics cold, reduce cryogen consumption, and then reduce energy consumption.
According to a particular embodiment of the invention, comprise further: methanol solution entrance 24, described methanol solution entrance 24 arranges and connects gas-liquid separator 20 with on the pipeline of water cooler 30, with before carrying out described second cooling process, in the first cooled natural gas, sprays into methanol solution.Can effectively avoid the second cooled natural gas obtained after the first cooling process carrying out the second cooling thus, the water vapor condensate wherein contained freezes and causes system jams.
According to a particular embodiment of the invention, the temperature obtaining the first cooled natural gas after above-mentioned first cooling process is 3-8 degree Celsius, and the temperature obtaining the second cooled natural gas after above-mentioned second cooling process is-20 ~-40 degrees Celsius.Can effectively to Sweet natural gas carry out pre-cooled from the low temperature exhaust gas of the regeneration system rapidly of the low temperature washing device for methanol in the system of described decontaminating syngas and/or low-temperature carbon dioxide as refrigerant by adopting thus.
According to a particular embodiment of the invention, the low-temp methanol prepared in the system of in the future self-purification synthetic gas as methanol wash liquid temperature Wei ?40～?70 degrees Celsius, thus can effectively to after pre-cooled process temperature Wei ?20～?40 degrees Celsius of Sweet natural gases carry out dry decontamination process.According to a particular embodiment of the invention, whole low-temp methanol lean solution participates in methane gas washing, and one is the temperature reducing purification methane gas as far as possible, and the dry decontamination of methane gas is more thorough, and in purification methane gas, methanol content is lower, and methanol loss is minimum; Two is that whole methyl alcohol lean solution is saturated methane gas, methane carrying amount in methanol solution is maximum, discharge in the absorption tower of low-temperature rectisol and enter decontaminating syngas, dilute the concentration of hydrogen and carbon monoxide in decontaminating syngas, be conducive to the heating strength of the methane building-up reactions reducing follow-up coal preparing natural gas, reduce the circulating flow rate of methanator, thus reduce the energy consumption of recycle compressor; Three is that the temperature of purification methane gas is low, is conducive to the freezing energy consumption reducing methane gas liquefaction preparing liquefied natural gas LNG device.
According to a particular embodiment of the invention, export 43 with the second refrigerant inlet 33 in water cooler 30 in the system of dry decontamination with purification methane for the pre-cooled of coal preparing natural gas and be connected, and the second refrigerant exit 34 is connected with described first refrigerant inlet 13.The cold of described purification methane effectively can be utilized thus to carry out the first cooling process and the second cooling process to described Sweet natural gas, save and reduce cryogen consumption, re-heat can also be carried out to purification methane simultaneously, be convenient to the pipe natural gas obtaining normal temperature.
According to a particular embodiment of the invention, for there is pre-cooler and water cooler in the system of the pre-cooled of coal preparing natural gas and dry decontamination, segmentation can be carried out to coal preparing natural gas pre-cooled.First paragraph (precooling zone) is cooled to 3-8 degrees centigrade, the phlegma of condensation separation most of water vapor wherein; Second segment (cooling section) continues to be cooled to-20 DEG C ~ about-40 DEG C and enters methane gas washing tower after spraying into antifreeze methyl alcohol.The present invention significantly reduces water and enters methanol solution, makes the moisture content in methanol solution minimum, and isolates not containing the water-cooled lime set of methyl alcohol.
According to a second aspect of the invention, the present invention also proposes a kind ofly to utilize the foregoing system for the pre-cooled of coal preparing natural gas and dry decontamination to carry out method that is pre-cooled and dry decontamination to coal preparing natural gas.According to a particular embodiment of the invention, the method comprises: in pre-cooler, carry out the first cooling process to coal preparing natural gas, to obtain the first cooled natural gas; In gas-liquid separator, gas-liquid separation is carried out to described first cooled natural gas, so that separation of water vapor phlegma; In water cooler, the second cooling process carried out to the first cooled natural gas through described gas-liquid separation and obtain the second cooled natural gas; In washing tower, drying and purifying treatment are carried out, to be purified methane to described second cooled natural gas; Wherein, the methanol wash liquid produced from the low temperature washing device for methanol in decontaminating syngas system is utilized to carry out drying and purifying treatment to described second cooled natural gas, obtain being rich in liquid after the methanol wash of methane, and liquid after described methanol wash is returned in the low-temp methanol absorption tower in the system of described decontaminating syngas purifying treatment is carried out to raw gas, be purified synthetic gas.
Thus, the method of coal preparing natural gas of the pre-cooled and dry decontamination of the above embodiment of the present invention is combined with the technique of decontaminating syngas, after the low-temp methanol prepared in the technique of decontaminating syngas is carried out dry decontamination process to coal preparing natural gas in advance, returning for purifying raw gas, being purified synthetic gas.Adopt same solvent methanol to purify raw gas and methane gas thus simultaneously, there is methane gas degree of purification high, in methane gas, methyl alcohol is carried secretly few, entrainment portions methane in methanol solution, after methanol wash, liquid can directly as the absorption liquid of low-temperature rectisol absorption tower tower top, and then eliminate separately for coal preparing natural gas washing tower is provided for low-temp methanol and the regeneration system rapidly of dry decontamination, reach energy-saving and cost-reducing object; Or eliminate and separately dry decontamination system is set separately for coal preparing natural gas dry decontamination, reach and reduce investment outlay and fall low consumed object.
According to a particular embodiment of the invention, aforesaid method comprises further: utilize methyl alcohol force (forcing) pump to be entered in described low-temp methanol absorption tower by liquid pump after described methanol wash.The low-temperature rectisol absorption tower tower top that liquid pump after methanol wash can be entered elevated pressures thus purifies as absorption washings raw gas, is purified synthetic gas.
According to a particular embodiment of the invention, aforesaid method comprises further: the methane be rich in liquid after utilizing degassing vessel to remove described methanol wash is also back in described washing tower.Thus, the portion of methane that can be rich in liquid after effective elimination methanol wash is also back in washing tower.
According to a particular embodiment of the invention, the low temperature exhaust gas that the regeneration system rapidly of the low temperature washing device for methanol in the system of described decontaminating syngas can be utilized to discharge and/or low-temperature carbon dioxide carry out the first cooling process and the second cooling process to described Sweet natural gas.Thus, cold logistics cold can be reclaimed, reduce cryogen consumption, and then reduce energy consumption.
According to a particular embodiment of the invention, before carrying out above-mentioned second cooling process, comprise further and spray into methanol solution in the first cooled natural gas.Can effectively avoid the second cooled natural gas obtained after the first cooling process carrying out the second cooling thus, the water vapor condensate wherein contained freezes and causes system jams.
According to a particular embodiment of the invention, described purification methane is utilized to carry out the first cooling process and the second cooling process to described Sweet natural gas.The cold of described purification methane effectively can be utilized thus to carry out the first cooling process and the second cooling process to described Sweet natural gas, save and reduce cryogen consumption, re-heat can also be carried out to purification methane simultaneously, be convenient to the pipe natural gas obtaining normal temperature.
Embodiment
Normal temperature methane gas (coal preparing natural gas) temperature from the synthesis of coal preparing natural gas device methane is about 35 ~ 45 DEG C, wherein containing saturated water vapor and more carbonic acid gas under pressure.Typical component is composed as follows:
Coal preparing natural gas component forms:
First the coal preparing natural gas (methane gas) of above-mentioned normal temperature enters pre-cooler, and cold logistics heat exchange is to 3-8 degrees centigrade, is separated the water-cooled lime set of wherein condensation; Then in water cooler forward direction methane gas, spray into methyl alcohol continue and cold logistics heat exchange, reduce temperature to-20 ~-40 degrees Celsius, enter methane gas wash tower bottoms.
Methane gas is in methane gas washing tower and low-temp methanol lean solution counter current contact, and low-temp methanol lean solution enters from methane gas washing tower top.Carbonic acid gas in methane gas, moisture in methane gas washing tower by methanol solution washing absorption, the methane gas be cleaned out is sent battery limit (BL) from washing tower top, temperature is about-40 ~-60 degrees Celsius, meets natural gas liquefaction ice chest to the content requirement can coagulating component; Low temperature purification methane gas also can reclaim cold re-heat, meets the dewpoint requirements of pipe natural gas to purified natural gas.
Containing a small amount of moisture and carbonic acid gas in the methanol solution of methane gas wash tower bottoms, remove after the gas wherein carried secretly through degassing vessel, the top, low-temperature rectisol absorption tower of elevated pressures is delivered to as methanol absorption liquid after the pressurization of low-temp methanol liquid pump, sour gas such as sulfide, carbonic acid gas and other harmful poisonous substances and impurity in washing absorption cooled coal gas, absorbs tower top and is purified synthetic gas.
Coal preparing natural gas after above-mentioned process is after dehydrating process, and the pressure of water dew point can meet pipe natural gas standard GB17820-2012.In coal preparing natural gas after above-mentioned process: CO
2carbonic acid gas is at below 50ppmv; H
2o water vapor is at 1 below ppmv; CH
3oH methyl alcohol is at below 50ppmv, and therefore, carbonic acid gas wherein and water vapor etc. can coagulate component concentration and meet liquefaction ice chest acceptable contents level, avoid ice chest to block, and reduce load and the energy consumption of deep purifying unit in natural gas liquefaction device.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In describing the invention, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the description of this specification sheets, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term need not for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification sheets or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (10)
1., for the system of the pre-cooled of coal preparing natural gas with dry decontamination, it is characterized in that, comprising:
Pre-cooler, described pre-cooler has gas inlet, the first cooled natural gas outlet, the first refrigerant inlet and the first refrigerant exit, and described pre-cooler is suitable for carrying out the first cooling process to coal preparing natural gas and obtaining the first cooled natural gas;
Gas-liquid separator, described gas-liquid separator has separator inlet, separator outlet and condensate outlet, and described separator inlet exports with described first cooled natural gas and is connected, and described gas-liquid separator is suitable for carrying out gas-liquid separation to described first cooled natural gas;
Water cooler, described water cooler has the first cooled natural gas entrance, the second cooled natural gas outlet, the second refrigerant inlet and the second refrigerant exit, described first cooled natural gas entrance is connected with described separator outlet, and described water cooler is suitable for carrying out the second cooling process to the first cooled natural gas through described gas-liquid separation and obtaining the second cooled natural gas; Washing tower, after described washing tower has the second cooled natural gas entrance, methanol wash liquid entrance, the outlet of purification methane and methanol wash, liquid exports, described second cooled natural gas entrance exports with described second cooled natural gas and is connected, described washing tower is suitable for utilizing methanol wash liquid to carry out drying and purifying treatment to described second cooled natural gas, so that liquid and purification methane after obtaining being rich in the methanol wash of methane;
Wherein, described methanol wash liquid entrance is connected with the low temperature washing device for methanol in the system of decontaminating syngas, after described methanol wash, liquid outlet is connected with the low-temp methanol absorption tower in the system of described decontaminating syngas, so that the low-temp methanol utilizing described low temperature washing device for methanol to produce returns the system of described decontaminating syngas for decontaminating syngas after carrying out dry decontamination process to described second cooled natural gas in advance in described washing tower.
2. according to claim 1 for the system of the pre-cooled of coal preparing natural gas with dry decontamination, it is characterized in that, comprise further:
Methyl alcohol force (forcing) pump, after described methyl alcohol force (forcing) pump is located at described methanol wash liquid outlet and described decontaminating syngas system in low-temp methanol absorption tower between and be suitable for liquid pump after described methanol wash to enter in described low-temp methanol absorption tower.
3. according to claim 2 for the system of the pre-cooled of coal preparing natural gas with dry decontamination, it is characterized in that, comprise further:
Degassing vessel, described degassing vessel is located between described washing tower and described methyl alcohol force (forcing) pump, and the methane be rich in liquid after described degassing vessel is suitable for removing described methanol wash is also back in described washing tower.
4. the system for the pre-cooled of coal preparing natural gas and dry decontamination according to any one of claim 1-3, it is characterized in that, described second refrigerant inlet exports with the regeneration system rapidly of the low temperature washing device for methanol in the system of described decontaminating syngas and is connected, and described second refrigerant exit is connected with described first refrigerant inlet, so that the low temperature exhaust gas utilizing the regeneration system rapidly of the low temperature washing device for methanol in the system of described decontaminating syngas to discharge and/or low-temperature carbon dioxide carry out the first cooling process and the second cooling process to described Sweet natural gas;
Optionally, comprise further: methanol solution entrance, described methanol solution entrance is arranged on the pipeline of the described gas-liquid separator of connection and described water cooler, so that before carrying out described second cooling process, in described first cooled natural gas, sprays into methanol solution.
5. the system for the pre-cooled of coal preparing natural gas and dry decontamination according to any one of claim 1-3, it is characterized in that, described second refrigerant inlet exports with described purification methane and is connected, and described second refrigerant exit is connected with described first refrigerant inlet, to utilize described purification methane to carry out the first cooling process and the second cooling process to described Sweet natural gas.
6. the system for the pre-cooled of coal preparing natural gas and dry decontamination according to any one of claim 1-5, it is characterized in that, the temperature of described methanol wash liquid is-40 ~-70 degrees Celsius, the temperature of described first cooled natural gas is 3-8 degree Celsius, and the temperature of described second cooled natural gas is-20 ~-40 degrees Celsius.
7. utilize the system for the pre-cooled of coal preparing natural gas and dry decontamination described in any one of 1-6 to carry out a method that is pre-cooled and dry decontamination to coal preparing natural gas, it is characterized in that, comprising:
In pre-cooler, the first cooling process is carried out to coal preparing natural gas, to obtain the first cooled natural gas;
In gas-liquid separator, gas-liquid separation is carried out to described first cooled natural gas, so that separation of water vapor phlegma;
In water cooler, the second cooling process carried out to the first cooled natural gas through described gas-liquid separation and obtain the second cooled natural gas;
In washing tower, drying and purifying treatment are carried out, to be purified methane to described second cooled natural gas;
Wherein, the methanol wash liquid produced from the low temperature washing device for methanol in decontaminating syngas system is utilized to carry out drying and purifying treatment to described second cooled natural gas, obtain being rich in liquid after the methanol wash of methane, and liquid after described methanol wash is returned in the low-temp methanol absorption tower in the system of described decontaminating syngas purifying treatment is carried out to raw gas, be purified synthetic gas.
8. method according to claim 7, is characterized in that, comprises further: utilize methyl alcohol force (forcing) pump to enter in described low-temp methanol absorption tower by liquid pump after described methanol wash;
Optionally, comprise further: the methane be rich in liquid after utilizing degassing vessel to remove described methanol wash is also back in described washing tower.
9. the method according to claim 7 or 8, it is characterized in that, the low temperature exhaust gas utilizing the regeneration system rapidly of the low temperature washing device for methanol in the system of described decontaminating syngas to discharge and/or low-temperature carbon dioxide carry out the first cooling process and the second cooling process to described Sweet natural gas;
Optionally, before carrying out described second cooling process, comprise further and spray into methanol solution in described first cooled natural gas.
10. the method according to any one of claim 7-9, is characterized in that, utilizes described purification methane to carry out the first cooling process and the second cooling process to described Sweet natural gas.
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| CN104673417B (en) | 2017-03-15 |
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