CN105126533A - Method, apparatus and system for controlling natural gas adsorption column, and purification system - Google Patents
Method, apparatus and system for controlling natural gas adsorption column, and purification system Download PDFInfo
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- CN105126533A CN105126533A CN201510438272.4A CN201510438272A CN105126533A CN 105126533 A CN105126533 A CN 105126533A CN 201510438272 A CN201510438272 A CN 201510438272A CN 105126533 A CN105126533 A CN 105126533A
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Abstract
The invention provides a method, an apparatus and a system for controlling a natural gas adsorption column, and a purification system, wherein the method for controlling the natural gas adsorption column includes following steps: (1) sending a signal controlling a valve at an absorption section of the adsorption column to be opened; (2) obtaining the flow rate and the impurity content of natural gas in an inlet pipeline of the absorption section, and determining a preset adsorption time according to the flow rate and the impurity content of the natural gas, and sending a control signal controlling the valve at the absorption section to be closed and the valve at the regeneration section to be opened when the actual adsorption time reaches the preset adsorption time; and (3) obtaining the impurity content of natural gas in an outlet pipeline of the regeneration section in real time, and sending a control signal controlling the valve at the regeneration section to be closed and a valve at a cold-blowing section to be opened when the impurity content reaches a preset impurity content value. In the embodiment, the method selects different adsorption time on the basis of different impurity content and flow rate of the raw material natural gas, so that the impurities in the raw material natural gas can be adsorbed better, thereby increasing the efficiency and service life of an adsorbent and saving energy.
Description
Technical field
The present invention relates to natural gas purification technical field, in particular to a kind of Adsorption Natural Gas tower control method, device, system and cleaning system.
Background technology
Natural gas is a kind of clean energy and industrial chemicals, China's natural gas long distance pipeline adopts the mode of high pressure gas transmission by natural gas transport to each natural valve station, downstream pipe network is conveyed into after reduced pressure treatment is carried out to high-pressure natural gas again in each natural valve station, or carry out liquefaction and be processed into liquefied natural gas, for user.
Generally speaking, from the unstripped gas at natural valve station containing the impurity such as water, mercury, sour gas, the system that each impurity can carry out step-down process to natural gas produces and has a strong impact on.Such as, the moisture in natural gas and natural gas form hydrate under certain condition and block pipeline, affect cooling liquid process; Can acid be formed in sour gas free water in natural gas, thus corrode pipeline and equipment; The corrosion of mercury to aluminum appliance corrosion and pipeline is very serious; In addition because the existence of moisture also can cause unnecessary power consumption; Because natural gas liquefaction temperature is lower, the existence of water and sour gas also can cause the frozen block of equipment, therefore must remove.
In order to address this problem, mode conventional is at present before natural gas reduces pressure, and first makes purified treatment by the unstripped gas of cleaning system to each natural valve station.At present, multiple clean unit is generally provided with in cleaning system, multiple adsorption tower is provided with in each clean unit, adsorbent is filled with in each adsorption tower, optionally remove the impurity such as the sour gas in raw natural gas, mercury, water, multiple tower can carry out adsorbing and regenerate (desorb) cycling simultaneously.Conventional adsorption method is TSA (Temp .-changing adsorption, TemperatureSwingAdsorption) and PSA (pressure-variable adsorption, PressureSwingAdsorption).Wherein, TSA suction type is by under the impurity absorption such as the sour gas in gas, water the effect of the natural gas adsorbent in tower entered at the bottom of tower, after having adsorbed, regenerate with desorption under high temperature gas, namely under normal temperature or low temperature, the impurity such as adsorbent water and sour gas is used, at high temperature desorption and regeneration is carried out to adsorbent afterwards, form the regeneration cycle of adsorbent, reach the object be continuously separated with Purge gas.PSA suction type is by under the impurity absorption such as the sour gas in gas, water the effect of the natural gas adsorbent in tower entered at the bottom of tower, after having adsorbed, regenerate with low pressure regeneration gas, namely the impurity such as water and sour gas in adsorbent natural gas is used at elevated pressures, under low pressure desorption and regeneration afterwards, form the absorption and regeneration circulation of adsorbent, reach the object be continuously separated with Purge gas.
Generally speaking, TSA comprises absorption, regeneration and cold blowing three workshop sections, adsorption tower is provided with multiple valve, absorption is realized by the switching of each valve, the air inlet of regeneration and cold blowing operation, be specially: open the valve corresponding with absorption process, high-pressure natural gas enters in adsorption tower, and in tower adsorbent effect under by under the impurity absorption such as the sour gas in gas, after having adsorbed, close the valve corresponding with absorption process, open the valve corresponding with step for regeneration, input high-temperature gas, with desorption under high temperature gas, adsorbent is regenerated, regenerate the valve that rear closedown is corresponding with step for regeneration, and open the valve corresponding with cold blowing operation, cold blowing gas is carried in adsorption tower, adsorption tower is lowered the temperature.
PSA comprises absorption and regeneration Liang Ge workshop section, adsorption tower is provided with multiple valve, the air inlet of absorption and step for regeneration is realized by the switching of each valve, be specially: open the valve corresponding with absorption process, high-pressure natural gas enters in adsorption tower, and in tower adsorbent effect under by under the impurity absorption such as the sour gas in gas, after having adsorbed, close the valve corresponding with absorption process, open the valve corresponding with step for regeneration again, low pressure natural gas from liquefaction workshop section passes through adsorbent as regeneration gas, by the change of pressure, the impurity in adsorbent is desorbed, regeneration gas after desorb is sent to gas distributing system input low-pressure gas.
Generally speaking, TSA suction type and PSA suction type process for purifying adsorption time T
1with recovery time T
2control the switching of each valve, thus change the state of the art of adsorption tower, in order to improve adsorbent service efficiency and reduce energy consumption, adsorption time T must be extended
1, shorten desorption time T
2, but simple time adjustment may cause adsorption effect to decline or desorb is not thorough.At present, the time of sorption and desorption is normally determined according to absorption and the Analysis on Mechanism of regenerative process and engineering practice, but can not carry out the flexible modulation of time according to the concrete condition of different unstripped gas, this not only can reduce life-span and the efficiency of adsorbent, also may cause the increase of energy consumption.
Summary of the invention
Given this, the present invention proposes a kind of Adsorption Natural Gas tower control method, be intended to solve existing control method can not carry out flexible modulation problem to each activity time.The invention allows for Adsorption Natural Gas tower control device, control system and cleaning system.
An aspect, the present invention proposes a kind of Adsorption Natural Gas tower control method, the method comprises the steps: first step, sends the control signal of the absorption workshop section valve open controlling described adsorption tower; Obtain flow and the impurity content of natural gas in described absorption workshop section inlet pipeline, and determine default adsorption time according to the flow of described natural gas and impurity content, and when actual adsorption time reaches described default adsorption time, send the control signal controlling described absorption workshop section valve closing, described regenerative section valve open; Second step, the impurity content of natural gas in the regenerative section outlet conduit of adsorption tower described in Real-time Obtaining, and the control signal controlling described regenerative section valve closing, described cold blowing workshop section valve open is sent when described impurity content reaches impurity preset value.
Further, in above-mentioned Adsorption Natural Gas tower control method, also comprise in described second step: the control signal sending described cold blowing workshop section valve open; The method also comprises: third step, the temperature of natural gas in the cold blowing workshop section outlet conduit of adsorption tower described in Real-time Obtaining, and sends the control signal controlling described cold blowing workshop section valve closing when described temperature reaches preset temperature.
Further, according to the flow of described inlet pipeline and impurity content, above-mentioned Adsorption Natural Gas tower control method, in described first step, determines that default adsorption time is further: according to formula
determine the adsorption time needed for each impurity of absorption tower adsorbs respectively, in this formula, the adsorption time of T needed for impurity; Q is adsorption tower adsorbent amount at full capacity; S
0for the content of this impurity of natural gas in absorption workshop section inlet pipeline; S' is the index content of this impurity of control of absorption workshop section export gas; F is the flow in absorption workshop section inlet pipeline; Using the above-mentioned minimum adsorption time determined as default adsorption time.
The present invention can determine adsorption time according to the flow of natural gas in absorption workshop section inlet pipeline and impurity content, when impurity content is high and/or flow is large, extend adsorption time, when impurity content is low and/or flow hour, shorten adsorption time, can find out, compared with prior art, the present embodiment adopts different adsorption times for the raw natural gas of different impurities content and flow, and then better the impurity in raw natural gas is adsorbed fully, improve efficiency and the service life of adsorbent, save energy consumption; In addition, this embodiment also by the impurity content of the natural gas in Real-Time Monitoring regenerative section outlet conduit, determines whether step for regeneration terminates, and adsorbent can be made to carry out more sufficient fully desorb.
On the other hand, the invention allows for a kind of Adsorption Natural Gas tower control device, this device comprises: the first module, for sending the control signal of the absorption workshop section valve open controlling described adsorption tower, and obtain flow and the impurity content of natural gas in described absorption workshop section inlet pipeline, and determine default adsorption time according to the flow of the natural gas of described inlet pipeline and impurity content, and reach described default adsorption time at actual adsorption time, send the control signal controlling described absorption workshop section valve closing, described regenerative section valve open; Second module, for the impurity content of natural gas in the regenerative section outlet conduit of adsorption tower described in Real-time Obtaining, and sends the control signal controlling described regenerative section valve closing when described impurity content reaches impurity preset value.
Further, in above-mentioned Adsorption Natural Gas tower control device, described second module is also for sending the control signal controlling described cold blowing workshop section valve open, this device also comprises: the 3rd module, for the temperature of natural gas in the cold blowing workshop section outlet conduit of adsorption tower described in Real-time Obtaining, and send the control signal controlling described cold blowing workshop section valve closing when described temperature reaches preset temperature.
Further, in above-mentioned Adsorption Natural Gas tower control device, the first module comprises: the first computing unit, for according to formula
determine the adsorption time needed for each impurity of absorption tower adsorbs respectively, in this formula, the adsorption time of T needed for impurity; Q is adsorption tower adsorbent amount at full capacity; S
0for the content of this impurity of natural gas in absorption workshop section inlet pipeline; S' is the index content of this impurity of control of absorption workshop section export gas; F is the flow in absorption workshop section inlet pipeline; Using the above-mentioned minimum adsorption time determined as default adsorption time.
Another aspect, the invention allows for a kind of Adsorption Natural Gas tower control system, this system comprises: the first defects inspecting unit, for detecting the impurity content of natural gas in absorption tower adsorbs workshop section inlet pipeline; Flowmeter, for detecting the flow of natural gas in absorption tower adsorbs workshop section inlet pipeline; Controller, be connected with described flowmeter with described first defects inspecting unit, for receiving impurity content and the flow of natural gas in described absorption workshop section inlet pipeline, and determine default adsorption time according to the impurity content of described inlet pipeline and flow, and when actual adsorption time reaches described default adsorption time, send the control signal controlling described absorption workshop section valve closing, described regenerative section valve open.
Further, above-mentioned Adsorption Natural Gas tower control system also comprises: the second defects inspecting unit, for detect described adsorption tower in real time regenerative section outlet conduit in the impurity content of natural gas; Described controller connects with described second defects inspecting unit, for receiving described impurity content, and sends the control signal controlling described regenerative section valve closing, described cold blowing workshop section valve open when described impurity content reaches impurity preset value.
Further, above-mentioned Adsorption Natural Gas tower control system also comprises: temperature detecting unit, for detect described adsorption tower in real time cold blowing workshop section outlet conduit in the temperature of natural gas; Described controller is connected with described temperature detecting unit, for receiving described temperature, and sends the control signal controlling described cold blowing workshop section valve closing when described temperature reaches preset temperature.
Adsorption Natural Gas tower control device in the present invention has the technique effect identical with control method with control system.
Another aspect, the invention allows for a kind of cleaning system, and this system comprises at least one absorbing unit and any one Adsorption Natural Gas tower control system above-mentioned; Wherein, each described clean unit comprises at least one adsorption tower.
Because Adsorption Natural Gas tower control system has above-mentioned effect, so the cleaning system with this Adsorption Natural Gas tower control system also has corresponding technique effect.
Accompanying drawing explanation
By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.Accompanying drawing only for illustrating the object of preferred embodiment, and does not think limitation of the present invention.And in whole accompanying drawing, represent identical parts by identical reference symbol.In the accompanying drawings:
The flow chart of the Adsorption Natural Gas tower control method that Fig. 1 provides for the embodiment of the present invention;
Another flow chart of the Adsorption Natural Gas tower control method that Fig. 2 provides for the embodiment of the present invention;
The structured flowchart of the Adsorption Natural Gas tower control device that Fig. 3 provides for the embodiment of the present invention;
Another structured flowchart of the Adsorption Natural Gas tower control device that Fig. 4 provides for the embodiment of the present invention;
In the Adsorption Natural Gas tower control device that Fig. 5 provides for the embodiment of the present invention, the structured flowchart of the first module;
The structural representation of the Adsorption Natural Gas tower control system that Fig. 6 provides for the embodiment of the present invention;
The another structural representation of the Adsorption Natural Gas tower control system that Fig. 7 provides for the embodiment of the present invention;
The another structural representation of the Adsorption Natural Gas tower control system that Fig. 8 provides for the embodiment of the present invention;
The another structural representation of the Adsorption Natural Gas tower control system that Fig. 9 provides for the embodiment of the present invention.
Detailed description of the invention
Below with reference to accompanying drawings exemplary embodiment of the present disclosure is described in more detail.Although show exemplary embodiment of the present disclosure in accompanying drawing, however should be appreciated that can realize the disclosure in a variety of manners and not should limit by the embodiment set forth here.On the contrary, provide these embodiments to be in order to more thoroughly the disclosure can be understood, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Control method embodiment:
See the flow chart of the Adsorption Natural Gas tower control method that Fig. 1, Fig. 1 provide for the embodiment of the present invention.As shown in the figure, the method comprises the steps:
Step S1, sends the control signal of the absorption workshop section valve open controlling adsorption tower; Obtain flow and the impurity content of natural gas in absorption workshop section inlet pipeline, and determine default adsorption time according to the flow of the natural gas of inlet pipeline and impurity content, and when actual adsorption time reaches default adsorption time, send the control signal controlling absorption workshop section valve closing, regenerative section valve open.
See Fig. 7, those skilled in the art are to be understood that, for TSA suction type, correspond to absorption workshop section, regenerative section and cold blowing workshop section, adsorption tower is generally provided with absorption workshop section inlet pipeline A1, absorption workshop section outlet conduit A2, regenerative section inlet pipeline A3, regeneration stage outlet conduit A4, cold blowing stage inlet pipeline A5 and cold blowing stage outlet conduit A6.The raw natural gas of absorption workshop section enters in adsorption tower by absorption workshop section inlet pipeline A1, in adsorption tower after absorption, flows out adsorption tower by absorption workshop section outlet conduit A2; Regeneration gas enters in adsorption tower by regenerative section inlet pipeline A3, by regenerative section outlet conduit A4 flows out adsorption tower after carrying out desorb to adsorbent; Cold blowing gas flows into adsorption tower by cold blowing workshop section inlet pipeline A5, by cold blowing workshop section outlet conduit A6 flows out adsorption tower after heating up to adsorbent.In order to the gas entered each workshop section controls, absorption workshop section inlet pipeline A1, absorption workshop section outlet conduit A2, regenerative section inlet pipeline A3, regeneration stage outlet conduit A4, cold blowing stage inlet pipeline A5 and cold blowing stage outlet conduit A6 are respectively arranged with the first valve 11, second valve 12, the 3rd valve 21, the 4th valve 22, the 5th valve 31 and the 6th valve 32.Again see Fig. 6, for PSA suction type, owing to not being provided with cold blowing workshop section, so compared with TSA suction type, be not provided with cold blowing workshop section inlet pipeline A5 and cold blowing workshop section outlet conduit A6, and corresponding 5th valve 31 and the 6th valve 32, other parts are identical with TSA suction type.
Particularly, in the present embodiment, first send the control signal that the first valve 11 and the second valve 12 are opened, raw natural gas is made to enter in adsorption tower by absorption workshop section inlet pipeline A1, then can by being arranged on flow and the impurity content of the flowmeter on absorption workshop section inlet pipeline A1 and the natural gas in defects inspecting unit acquisition absorption workshop section inlet pipeline A1.It should be noted that, in the present embodiment, the impurity in natural gas can comprise H
2o, CO
2, C
5+, sour gas (such as H
2s etc.), mercury etc., certainly, other impurity that yet can be well known to those skilled in the art, the present embodiment does not do any restriction to the particular content of impurity.
In the present embodiment, control adsorption process by adsorption time.Particularly, flow and impurity content according to adsorbing natural gas in workshop section inlet pipeline A1 determine default adsorption time, when impurity content is high and/or flow is large, extend adsorption time, when impurity content is low and/or flow hour, shorten adsorption time; When actual adsorption time reaches default adsorption time, send the control signal controlling absorption workshop section valve closing, regenerative section valve open, namely close the first valve 11, second valve 12, open the 3rd valve 21, the 4th valve 22, make adsorption tower enter step for regeneration.
Step S2, the impurity content of natural gas in the regenerative section outlet conduit of Real-time Obtaining adsorption tower, and the control signal controlling regenerative section valve closing is sent when impurity content reaches impurity preset value.
Particularly, can by being arranged on the natural gas impurity content in regenerative section outlet conduit A2, along with the carrying out of step for regeneration, impurity content in regenerative section outlet conduit can constantly reduce, when this impurity content equals impurity preset value, send the control signal controlling regenerative section valve closing, namely close the 3rd valve 21 and the 4th valve 22.
In present embodiment, adsorption time can be determined according to the flow of the natural gas in absorption workshop section inlet pipeline and impurity content, when impurity content is high and/or flow is large, extend adsorption time, when impurity content is low and/or flow hour, shorten adsorption time, can find out, compared with prior art, the present embodiment adopts different adsorption times for the raw natural gas of different impurities content and flow, and then better the impurity in raw natural gas is adsorbed fully, improve efficiency and the service life of adsorbent, save energy consumption.This embodiment, by the impurity content of the natural gas in Real-Time Monitoring regenerative section outlet conduit, determines whether step for regeneration terminates, and adsorbent can be made to carry out more sufficient fully desorb.
See another flow chart that Fig. 2, Fig. 2 are the Adsorption Natural Gas tower control methods that the embodiment of the present invention provides.As shown in the figure, the method comprises the steps:
Step S1, sends the control signal of the absorption workshop section valve open controlling adsorption tower; Obtain flow and the impurity content of natural gas in absorption workshop section inlet pipeline, and the flow carried according to inlet pipeline natural and impurity content determine default adsorption time, and when actual adsorption time reaches default adsorption time, send the control signal controlling absorption workshop section valve closing, regenerative section valve open.
Step S2, the impurity content of natural gas in the regenerative section outlet conduit of Real-time Obtaining adsorption tower, and the control signal controlling regenerative section valve closing, cold blowing workshop section valve open is sent when impurity content reaches impurity preset value.Wherein, step S1 is substantially identical with above-mentioned embodiment with the specific implementation process of step S2, and difference is only, after closedown the 3rd valve 21 and the 4th valve 22, terminate step for regeneration, also send the control signal opening the 5th valve 31 and the 6th valve 32, enter cold blowing operation.
Step S3, the temperature of natural gas in the cold blowing workshop section outlet conduit of Real-time Obtaining adsorption tower, and the control signal controlling cold blowing workshop section valve closing is sent when temperature reaches preset temperature.
Particularly, the temperature in cold blowing workshop section outlet conduit A6 can be detected by temperature instrument, along with the carrying out of cold blowing workshop section, temperature in cold blowing workshop section outlet conduit A6 can decline, when this temperature drops to preset temperature, when namely equaling preset temperature, send the signal controlling closedown the 5th valve 31 and the 6th valve 32.It should be noted that, preset temperature can be determined according to actual conditions, and the present embodiment does not do any restriction to it.
In the present embodiment, by the temperature of natural gas in Real-Time Monitoring cold blowing workshop section outlet conduit A6, determine the end of cold blowing workshop section, the mode of this Real-Time Monitoring, adsorbent can be made to be reduced to preset temperature more fully, recover the adsorption function of adsorbent better.
During concrete enforcement, default adsorption time can be determined as follows: first according to formula
determine the adsorption time needed for each impurity of absorption tower adsorbs, in this formula, the adsorption time of T needed for certain impurity, unit is h; Q is adsorption tower adsorbent amount at full capacity, by character and the quality decision of apparatus structure, adsorbent, is certain value, units/kg; S is the content of this impurity of natural gas in absorption workshop section inlet pipeline, and unit is mg/Nm
3; S' is this impurity index content of control of absorption workshop section outlet conduit natural gas, and unit is mg/Nm
3; F is the flow in absorption workshop section inlet pipeline, and unit is Nm
3/ h.Using the above-mentioned minimum adsorption time determined as default adsorption time.During concrete enforcement, S' is the index content of this impurity of the natural gas adsorbed in workshop section outlet conduit A2, namely adsorb the content of this impurity allowed in the natural gas of workshop section's output, this content can be determined according to actual conditions, and the present embodiment does not do any restriction to it.
Such as, for can adsorbing contaminant H
2o, CO
2, C
5+and H
2the adsorption tower of S, first according to above-mentioned formulae discovery H
2o, CO
2, C
5+and H
2adsorption time needed for S is respectively T
1, T
2, T
3and T
4, then using minimum as presetting adsorption time in four adsorption times calculated.
To sum up, the present embodiment is controlled absorption process by the natural gas impurity content in adsorption time or absorption workshop section outlet conduit, impurity in raw natural gas can not only be adsorbed fully, also reasonable control can adsorb workshop section simultaneously, after fully adsorbing, namely terminate this operation, improve adsorption efficiency; In addition, the present embodiment also by the impurity content of the natural gas in Real-Time Monitoring regenerative section outlet conduit, determines whether step for regeneration terminates, and adsorbent can be made to carry out more sufficient fully desorb.
Control device embodiment:
See the structured flowchart of the Adsorption Natural Gas tower control device that Fig. 3, Fig. 3 provide for the embodiment of the present invention.As shown in the figure, this device comprises: the first module 100 and the second module 200.Wherein,
First module 111, for sending the control signal of the absorption workshop section valve open controlling adsorption tower, and obtain flow and the impurity content of natural gas in absorption workshop section inlet pipeline, and determine default adsorption time according to the flow and impurity content adsorbing workshop section inlet pipeline A1, and when actual adsorption time reaches default adsorption time, send the control signal controlling absorption workshop section valve closing, regenerative section valve open.
Second module 200, for the impurity content of natural gas in the regenerative section outlet conduit of Real-time Obtaining adsorption tower, and sends the control signal controlling regenerative section valve closing, cold blowing workshop section valve open when impurity content reaches impurity preset value.
The specific implementation process of the present embodiment is see above-mentioned control method embodiment, and the present embodiment does not repeat them here.
In present embodiment, adsorption time can be determined according to the flow of the natural gas in absorption workshop section inlet pipeline and impurity content, when impurity content is high and/or flow is large, extend adsorption time, when impurity content is low and/or flow hour, shorten adsorption time, can find out, compared with prior art, the present embodiment adopts different adsorption times for the raw natural gas of different impurities content and flow, and then better the impurity in raw natural gas is adsorbed fully, improve efficiency and the service life of adsorbent, save energy consumption.This embodiment, by the impurity content of the natural gas in Real-Time Monitoring regenerative section outlet conduit, determines whether step for regeneration terminates, and adsorbent can be made to carry out more sufficient fully desorb.
See Fig. 4, above-described embodiment also comprises: the 3rd module 300.Wherein, the second module 200 is also for sending the control signal controlling cold blowing workshop section valve open.3rd module 300, for the temperature of natural gas in the cold blowing workshop section outlet conduit of Real-time Obtaining adsorption tower, and sends the control signal controlling cold blowing workshop section valve closing when temperature reaches preset temperature.The specific implementation process of the second module 200 and the 3rd module 300 is see above-mentioned control method embodiment, and the present embodiment does not repeat them here.
In the present embodiment, by the temperature of natural gas in Real-Time Monitoring cold blowing workshop section outlet conduit, determine the end of cold blowing workshop section, the mode of this Real-Time Monitoring, adsorbent can be made to be reduced to preset temperature more fully, recover the adsorption function of adsorbent better.
See Fig. 5, in the various embodiments described above, the first module 100 comprises: the first computing unit 110, for according to formula
determine the adsorption time needed for each impurity of absorption tower adsorbs respectively, in this formula, the adsorption time of T needed for impurity; Q is adsorption tower adsorbent amount at full capacity; S
0for the impurity content of natural gas in absorption workshop section inlet pipeline; S' is the Con trolling index content of absorption workshop section export gas; F is the flow in absorption workshop section inlet pipeline; Using the above-mentioned minimum adsorption time determined as default adsorption time.Wherein, the specific implementation process of the first computing unit 110 is see above-mentioned control method embodiment, and the present embodiment does not repeat them here.
To sum up, the present embodiment is controlled absorption process by the natural gas impurity content in adsorption time or absorption workshop section outlet conduit, impurity in raw natural gas can not only be adsorbed fully, also reasonable control can adsorb workshop section simultaneously, after fully adsorbing, namely terminate this operation, improve adsorption efficiency; In addition, the present embodiment also by the impurity content of the natural gas in Real-Time Monitoring regenerative section outlet conduit, determines whether step for regeneration terminates, and adsorbent can be made to carry out more sufficient fully desorb.
Control system embodiment:
See Fig. 6 and Fig. 7, there is shown the preferred structure of the Adsorption Natural Gas tower control system that the present embodiment provides.As shown in the figure, this system comprises: the first defects inspecting unit 1, flowmeter 2 and controller 4.
Wherein, first defects inspecting unit 1 and flowmeter 2 are installed on absorption workshop section inlet pipeline A1, first defects inspecting unit 1 is for detecting the impurity content of natural gas in absorption tower adsorbs workshop section inlet pipeline, and flowmeter 2 is for detecting the flow of natural gas in absorption tower adsorbs workshop section inlet pipeline.
Controller 4 is electrically connected with the first defects inspecting unit 1 and flowmeter 2, for receiving impurity content and the flow of natural gas in absorption workshop section inlet pipeline A1, and determine default adsorption time according to the flow and impurity content adsorbing workshop section inlet pipeline A1, and when actual adsorption time reaches default adsorption time, send the control signal controlling absorption workshop section valve closing, regenerative section valve open.
Particularly, controller 4 can send the opening and closing of control first valve 11, second valve 12, the 3rd valve 21, the 4th valve 22, the 5th valve 31 and the 6th valve 32.After the first valve 11 and the second valve 12 are opened, raw natural gas just enters in adsorption tower by absorption workshop section inlet pipeline A1, is obtained flow and the impurity content of the natural gas in absorption workshop section inlet pipeline A1 by flowmeter 2 and the first defects inspecting unit 1.Controller 4 can be the processor such as single-chip microcomputer, DSP.
In the present embodiment, controller 4 can control adsorption process by controlling adsorption time.Particularly, default adsorption time is determined according to the flow of the natural gas of absorption workshop section inlet pipeline and impurity content, and when actual adsorption time reaches default adsorption time, control the first valve 11 and the second valve 12 is closed, the 3rd valve 21 and the 4th valve 22 are opened, make adsorption tower enter step for regeneration.In the present embodiment, adsorption time can be determined according to the flow of the natural gas in absorption workshop section inlet pipeline A1 and impurity content, when impurity content is high and/or flow is large, extend adsorption time, when impurity content is low and/or flow hour, shorten adsorption time, when specifically implementing, default adsorption time can be determined by the following method: first according to formula
determine the adsorption time needed for each impurity of absorption tower adsorbs, in this formula, the adsorption time of T needed for certain impurity, unit is h; Q is adsorption tower adsorbent amount at full capacity, by character and the quality decision of apparatus structure, adsorbent, is certain value, units/kg; S is the content of this impurity of natural gas in absorption workshop section inlet pipeline, and unit is mg/Nm
3; S' is this impurity index content of control of absorption workshop section outlet conduit natural gas, and unit is mg/Nm
3; F is the flow in absorption workshop section inlet pipeline, and unit is Nm
3/ h.Using the above-mentioned minimum adsorption time determined as default adsorption time.During concrete enforcement, S' is the index content of this impurity of the natural gas adsorbed in workshop section outlet conduit A2, and this content can be determined according to actual conditions, and the present embodiment does not do any restriction to it.
Such as, if impurity comprises H
2o, CO
2, C
5+and H
2s, then according to above-mentioned formulae discovery H
2o, CO
2, C
5+and H
2adsorption time needed for S is respectively T
1, T
2, T
3and T
4, and using minimum as presetting adsorption time in four adsorption times calculated.It should be noted that, when specifically implementing, the adsorption time needed for impurity that can only calculate content overproof according to above formula.
Can find out, with in prior art whatsoever the raw natural gas of condition all adopt compared with fixing adsorption time, the present embodiment can adopt different adsorption times for the situation of different material natural gas, can adsorb the impurity in raw natural gas better, improve efficiency and the life-span of adsorbent, and economize energy.
Continue again see Fig. 6, in above-described embodiment, can also comprise: the second defects inspecting unit 3, for detect adsorption tower in real time regenerative section outlet conduit A4 in the impurity content of natural gas; Controller 4 is connected with the second defects inspecting unit 3, for receiving this impurity content, and sends the control signal controlling regenerative section valve closing when impurity content reaches impurity preset value.
Particularly, the impurity content of natural gas can be detected by the second defects inspecting unit 3 be arranged in regenerative section outlet conduit A2, along with the carrying out of step for regeneration, impurity content in regenerative section outlet conduit can constantly reduce, when this impurity content equals impurity preset value, send the control signal controlling regenerative section valve closing, namely close the 3rd valve 21 and the 4th valve 22, terminate step for regeneration.This embodiment, by the impurity content of the natural gas in Real-Time Monitoring regenerative section outlet conduit A2, determines whether step for regeneration terminates, and adsorbent can be made to carry out more sufficient fully desorb.
It should be noted that, the control mode in the present embodiment is not only applicable to PSA suction type, is applicable to the absorption process in TSA suction type and step for regeneration yet, is described the course of work of the present embodiment below in conjunction with Fig. 6 and Fig. 7:
1) absorption workshop section imported valve 11 and absorption workshop section outlet valve 12 is opened, the raw material high-pressure natural gas that door station is come enters the absorption workshop section of clean unit C or clean unit D by absorption workshop section inlet pipeline A1, optionally imurity-removal (such as H2O, sour gas or mercury etc.), when absorption starts, the impurity concentration in absorption workshop section exit is very low, As time goes on, impurity concentration rises gradually, by detecting impurity content and the flow of raw natural gas entrance, calculate adsorption time T
1, after reaching adsorption time, controller 4 controls cut out first valve valve 11 and the second valve 12, meanwhile, opens the 3rd valve 21 and the 4th valve 22, and absorption workshop section terminates, and regenerative section starts; High-pressure natural gas after the purification exported enters ice chest, with the cryogenic natural gas heat exchange after expansion by absorption workshop section outlet conduit.
2) regeneration gas is input to regenerative section by regenerative section inlet pipeline A1, the impurity adsorbed in adsorbent is desorbed, when desorption process starts, tower outlet impurity concentration is very high, As time goes on, impurity concentration declines gradually, the impurity content in regenerative section outlet conduit A4 is detected by the second defects inspecting unit 3, and testing result is sent to controller 4, after impurity content is lower than (such as 1ppm) during impurity preset value, controller 4 controls cut out the 3rd valve 21 and the 4th valve 22.For PSA suction type, regeneration gas be from liquefaction workshop section low pressure natural gas as regeneration gas, desorbed by impurity in adsorbent by the change of pressure, the regeneration gas after desorb is exported by desorb workshop section outlet conduit A4 and is sent to gas distributing system; For TSA suction type, regeneration gas can be the low pressure natural gas from liquefaction workshop section, this natural gas is after heater 6 is heated to 280 DEG C, regenerative section is entered as high temperature regeneration gas, desorbed by impurity in adsorbent, the regeneration gas after desorb is exported by desorb workshop section outlet conduit A4 and is sent to gas distributing system.
Can find out, the present embodiment is by determining adsorption time according to the flow of raw natural gas and impurity content, impurity in raw natural gas can not only be adsorbed fully, also reasonable control can adsorb workshop section simultaneously, after fully adsorbing, namely terminate this operation, improve adsorption efficiency; In addition, the present embodiment also by the impurity content of the natural gas in Real-Time Monitoring regenerative section outlet conduit, determines whether step for regeneration terminates, and adsorbent can be made to carry out more sufficient fully desorb.
See Fig. 7, in the various embodiments described above, after regenerative section terminates, controller 4 is also for sending the control signal controlling cold blowing workshop section valve open.Can also comprise in this embodiment: temperature detecting unit 5, for detect adsorption tower in real time cold blowing workshop section outlet conduit A6 in the temperature of natural gas, controller 4 is connected with temperature detecting unit 5, for receiving this temperature, and send the control signal controlling cold blowing workshop section valve closing when temperature reaches preset temperature.The present embodiment is applicable to TSA suction type.
Particularly, after regenerative section terminates, controller 4 can also control cold blowing workshop section valve open, controls to open the 5th valve 31 and the 6th valve 32, enters cold blowing workshop section.This temperature detecting unit 5 can be temperature instrument, be arranged on cold blowing workshop section outlet conduit A6, in order to detect the temperature in cold blowing workshop section outlet conduit A6, along with the carrying out of cold blowing workshop section, temperature in cold blowing workshop section outlet conduit A6 can decline, when this temperature drops to preset temperature, when namely equaling preset temperature, send the signal controlling closedown the 4th valve 31 and the 5th valve 32, terminate cold blowing workshop section.It should be noted that, preset temperature can be determined according to actual conditions, and the present embodiment does not do any restriction to it.
The present embodiment is applicable to TSA suction type, and the above-mentioned course of work can also comprise cold blowing operation, is specially:
3) low pressure natural gas enters in adsorption tower by cold blowing workshop section inlet pipeline A5, adsorbent is cooled, after cold blowing workshop section outlet temperature reaches design temperature, cold blowing terminates, start next circulation, the low pressure natural gas as cold blowing gas is exported by cold blowing workshop section outlet conduit A6 and is entered gas distributing system.
In the present embodiment, by the temperature of natural gas in Real-Time Monitoring cold blowing workshop section outlet conduit A6, determine the end of cold blowing workshop section, the mode of this Real-Time Monitoring, adsorbent can be made to be reduced to preset temperature more fully, recover the adsorption function of adsorbent better.
Each valve in the present embodiment can be all electrically-controlled valve or hydraulic valve.
Preferably, when specifically implementing, impurity preset value can be less than or equal to 1ppm, and preset temperature can be less than or equal to 40 DEG C.
It should be noted that, during concrete enforcement, see Fig. 8 and Fig. 9, also an optimization calculator can be set up again, receive each parameter of the first defects inspecting unit 1, second defects inspecting unit 3, flowmeter 2 and temperature detecting unit 5 detection by optimizing calculator, and carry out the calculating of default adsorption time, or compare with corresponding preset value, send the signal controlling each valve open or closedown to controller 4, controller 4 is according to each valve of the signal manipulation received.
It should be noted that, Adsorption Natural Gas tower control method, control device and control system principle in the present invention are similar, and relevant part can be cross-referenced.
To sum up, the present embodiment is controlled absorption process by the natural gas impurity content in adsorption time or absorption workshop section outlet conduit, impurity in raw natural gas can not only be adsorbed fully, also reasonable control can adsorb workshop section simultaneously, after fully adsorbing, namely terminate this operation, improve adsorption efficiency; In addition, the present embodiment also by the impurity content of the natural gas in Real-Time Monitoring regenerative section outlet conduit, determines whether step for regeneration terminates, and adsorbent can be made to carry out more sufficient fully desorb.
Cleaning system embodiment:
The embodiment of the present invention proposes a kind of cleaning system, and this cleaning system comprises at least one clean unit and any one Adsorption Natural Gas tower control system above-mentioned.Each clean unit comprises at least one adsorption tower, is controlled each adsorption tower in this cleaning system by above-mentioned Adsorption Natural Gas tower control system.Wherein, the specific implementation process of Adsorption Natural Gas tower control system illustrates see above-mentioned, and the present embodiment does not repeat them here.
Because Adsorption Natural Gas tower control system has above-mentioned effect, so the cleaning system with this Adsorption Natural Gas tower control system also has corresponding technique effect.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. an Adsorption Natural Gas tower control method, is characterized in that, comprises the steps:
First step, sends the control signal of the absorption workshop section valve open controlling described adsorption tower; Obtain flow and the impurity content of natural gas in described absorption workshop section inlet pipeline, and determine default adsorption time according to the flow of described natural gas and impurity content, and when actual adsorption time reaches described default adsorption time, send the control signal controlling described absorption workshop section valve closing, described regenerative section valve open;
Second step, the impurity content of natural gas in the regenerative section outlet conduit of adsorption tower described in Real-time Obtaining, and the control signal controlling described regenerative section valve closing is sent when described impurity content reaches impurity preset value.
2. Adsorption Natural Gas tower control method according to claim 1, is characterized in that,
Also comprise in described second step: send the control signal controlling described cold blowing workshop section valve open;
Described control method also comprises: third step, the temperature of natural gas in the cold blowing workshop section outlet conduit of adsorption tower described in Real-time Obtaining, and sends the control signal controlling described cold blowing workshop section valve closing when described temperature reaches preset temperature.
3. Adsorption Natural Gas tower control method according to claim 1 and 2, is characterized in that, in described first step, determines that default adsorption time comprises further according to the flow of described inlet pipeline and impurity content:
According to formula
determine the adsorption time needed for each impurity of absorption tower adsorbs respectively, in this formula, the adsorption time of T needed for impurity; Q is adsorption tower adsorbent amount at full capacity; S
0for the content of this impurity of natural gas in absorption workshop section inlet pipeline; S' is the index content of this impurity of control of absorption workshop section export gas; F is the flow in absorption workshop section inlet pipeline;
Using the above-mentioned minimum adsorption time determined as default adsorption time.
4. an Adsorption Natural Gas tower control device, is characterized in that, comprising:
First module, for sending the control signal of the absorption workshop section valve open controlling described adsorption tower, and obtain flow and the impurity content of natural gas in described absorption workshop section inlet pipeline, and determine default adsorption time according to the flow of the natural gas of described inlet pipeline and impurity content, and reach described default adsorption time at actual adsorption time, send the control signal controlling described absorption workshop section valve closing;
Second module, for the impurity content of natural gas in the regenerative section outlet conduit of adsorption tower described in Real-time Obtaining, and send the control signal controlling described regenerative section valve closing, described cold blowing workshop section valve open when described impurity content reaches impurity preset value.
5. Adsorption Natural Gas tower control device according to claim 4, is characterized in that,
Described second module is also for sending the control signal controlling described cold blowing workshop section valve open;
Described control device also comprises: the 3rd module, for the temperature of natural gas in the cold blowing workshop section outlet conduit of adsorption tower described in Real-time Obtaining, and sends the control signal controlling described cold blowing workshop section valve closing when described temperature reaches preset temperature.
6. the Adsorption Natural Gas tower control device according to claim 4 or 5, is characterized in that, described first module comprises: the first computing unit, for:
According to formula
determine the adsorption time needed for each impurity of absorption tower adsorbs respectively, in this formula, the adsorption time of T needed for impurity; Q is adsorption tower adsorbent amount at full capacity; S
0for the content of this impurity of natural gas in absorption workshop section inlet pipeline; S' is the index content of this impurity of control of absorption workshop section export gas; F is the flow in absorption workshop section inlet pipeline;
Using the above-mentioned minimum adsorption time determined as default adsorption time.
7. an Adsorption Natural Gas tower control system, is characterized in that, comprising:
First defects inspecting unit, for detecting the impurity content of natural gas in absorption tower adsorbs workshop section inlet pipeline;
Flowmeter, for detecting the flow of natural gas in absorption tower adsorbs workshop section inlet pipeline;
Controller, be connected with described flowmeter with described first defects inspecting unit, for receiving impurity content and the flow of natural gas in described absorption workshop section inlet pipeline, and determine default adsorption time according to the impurity content of described inlet pipeline and flow, and when actual adsorption time reaches described default adsorption time, send the control signal controlling described absorption workshop section valve closing, described regenerative section valve open.
8. Adsorption Natural Gas tower control system according to claim 7, is characterized in that, also comprise:
Second defects inspecting unit, for detect described adsorption tower in real time regenerative section outlet conduit in the impurity content of natural gas;
Described controller is connected with described second defects inspecting unit, for receiving described impurity content, and sends the control signal controlling described regenerative section valve closing when described impurity content reaches impurity preset value.
9. Adsorption Natural Gas tower control system according to claim 8, is characterized in that,
Described controller is also for sending the control signal controlling cold blowing workshop section valve open;
Described control system also comprises: temperature detecting unit, for detect described adsorption tower in real time cold blowing workshop section outlet conduit in the temperature of natural gas;
Described controller is connected with described temperature detecting unit, for receiving described temperature, and sends the control signal controlling described cold blowing workshop section valve closing when described temperature reaches preset temperature.
10. a cleaning system, comprises at least one absorbing unit, and each described clean unit comprises at least one adsorption tower, it is characterized in that, also comprises the Adsorption Natural Gas tower control system according to any one of claim 7 to 9.
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